Drivers of Small-Scale Fishers’ Willingness to Adopt Property Rights Co-Management in the Lake Nokou é and Porto-Novo Lagoon Complex in Southeast Benin

: The estuarian and lagoon areas of southeast Benin are atypical lake territories where private property rights are hereditary from endogenous legal tradition. People live in stilt dwellings and are exclusively dedicated to free-to-access ﬁshing. Consequently, an increasing number of ﬁshers with low respect for the State’s general rules for sustainable ﬁshing contribute to legal pluralism and the tragedy of the commons. Co-management of small-scale ﬁsheries has been advocated to offer various beneﬁts, including improved socio-ecological integration, shared sustainable livelihoods, and adherence to biodiversity objectives. This study aims to assess the factors that inﬂuence the willingness of small-scale ﬁshers to adopt property rights co-management options in southeast Benin. The data were collected using the discrete choice experiment method. The results show that 44% of ﬁshers are willing to adopt property rights co-management options. This willingness is determined by their involvement in the co-management committee, access to a subsidy and livelihood diversiﬁcation options. These ﬁshers are the oldest in the sample and primarily owners of Acadja, a traditional ﬁshing tool made of bush and tree branches planted in the lake. Institutional agreements for co-management establishment, such as subsidies to support small-scale ﬁshers’ livelihood diversiﬁcation and capacity-building, must be set up to achieve co-management goals.


Introduction
The role of inland fisheries in livelihoods, food security, and sustainable development is often eclipsed by the strongest interest given to ocean issues. Even though inland fisheries capture and contribute to food and nutrition security and the economy less than marine fishing, global-level comparisons of fish production obscure considerable livelihood impacts in certain countries and subnational areas [1]. In several parts of Africa, communities near rivers and water bodies rely on small-scale fisheries, vital in providing food, nutrition, income, and employment for local people [2][3][4]. Policymakers have frequently overlooked small-scale fisheries in rural development planning, rural economic development, and pro-poor growth policy formulation, mainly due to the lack of reliable data on their gross domestic production (GDP) contribution [5]. Understanding critical behaviour and transitions is essential for the sustainable management and restoration of the environment and ecosystems [6][7][8][9].
On the Beninese coast, the Lake Nokoué-Porto-Novo lagoon complex is the largest water body in the country [10,11]. It provides more than 600,000 people livelihoods through decision-making and regulatory effectiveness [38,39]. Co-managed small-scale fisheries deliver positive ecological and social outcomes where improvements in governance are the most frequently reported [40]. Even though the literature specifies conditions that would encourage co-management, most authors agree that co-management success depends on the specific context [41][42][43][44].
Worldwide, policy frameworks such as subsidies or payments for ecosystem services are implemented to reinforce households' involvement and engagement in innovative agri-environmental schemes [45][46][47][48]. According to the World Trade Organization, a subsidy is a financial contribution by a government or any public body that confers a benefit to the private sector via transfers of funds, including grants, loans, and equity in fusions or potential fund transfers such as loan guarantees. The subsidy is beneficial if it supports a positive externality, such as improving stock sustainability or social welfare [49]. Following this logic, grants to fisheries management (monitoring, enforcement, stock assessment, etc.), fisheries research, and development are generally classified as good for resource sustainability [50]. However, the theory and available empirical studies are clear-subsidies that artificially increase profits by reducing fishing costs and increasing fishers' revenue result in overcapacity and overfishing [45,51]. Therefore, subsidy promotion should first aim at adjusting consumption and production capacities to a size commensurate with sustainable exploitation limits [52].
To help with the transition to a sustainable fisheries sector, it is necessary to understand better fishers' willingness and motivation to invest in and adopt sustainable practices [53,54].
For decades, studies have been conducted with different environmental and economic methods on how consumers value the environmental benefits of various policy initiatives [55]. Based on the random utility theory (RUT), the discrete choice experiment (DCE) has become one of the most popular survey-based methods among valuation researchers [56]. In stated choice experiments, consumer valuations are elicited indirectly by asking consumers to choose their preferred option from several alternatives given a set of attributes. By varying the characteristics in different scenarios, it is possible to estimate consumers' sensitivity to changes in these attributes and estimate, for example, the price reduction required to compensate for unfavourable attributes [57][58][59]. Thus, Villamayor-Tomas, Sagebiel, and Olschewski [48] used a DCE to explore farmers' willingness to participate in a tree-planting measure in Germany, Switzerland, and Spain. Their findings illustrate the interest in further integrating farmers in the design of agri-environmental schemes and further testing the feasibility of coordinated plans in the light of the influence of both monetary and social incentives. Christensen et al. [60] employed a DCE to explore Danish farmers' interest in agri-environmental subsidy schemes. They found that farmers are willing to trade-off the size of the subsidy for less restrictive scheme requirements. Phong, Tang, and Hoai [61] used a DCE to identify what motivates farmers to accept good aquaculture practices in development policy. They found that increasing the adoption of good aquaculture practices in Vietnam needs other support policies, such as aquaculture insurance provision, subsidies for wastewater treatment, and compliance with regulations on antibiotic use. Oleson et al. used [62] the DCE method to characterise what is essential to improve fisheries ecosystem protection in the indigenous area of Madagascar. They found that bequest is highly valued and necessary for the respondents, who were willing to pay a substantial portion of their income to protect ecosystems for future generations. Ngoc et al [53] used a choice experiment approach to model fishers' choices when purchasing different potential fishing lots in the communal fishing grounds. They showed that the bidding behaviour of the more privileged group out-competes the other group irrespective of the lot characteristics. One likely suitable policy tool that has had some traction in promoting sustainability and diversification in fisheries and agriculture in developing countries is subsidies [63][64][65]. The inland fisheries of southeast Benin are not immune to the global debate on the challenges of different approaches of fisheries management at a time when co-management is being promoted in other contexts. The present study assesses small-scale fishers' willingness to adopt the property rights co-management scheme for water resource sustainability.

Study Area
In southeast Benin, there is an estuarine and lagoon complex named Lake Nokoué-Porto-Novo lagoon in the southeast, covering 180 km 2 and forming part of Ramsar site 1018. It is supplied with fresh water by the Sô and Ouémé rivers and subjected to marine influences through the channels of Cotonou and Badagry [13]. The two bodies of water maintain a permanent link through the three-kilometer-long Totchè channel ( Figure 1). This area was selected for the study following previous works [18,19] which demonstrated the existence of the problem of property rights on the water in these two towns.
purchasing different potential fishing lots in the communal fishing grounds. They showed that the bidding behaviour of the more privileged group out-competes the other group irrespective of the lot characteristics. One likely suitable policy tool that has had some traction in promoting sustainability and diversification in fisheries and agriculture in developing countries is subsidies [63][64][65]. The inland fisheries of southeast Benin are not immune to the global debate on the challenges of different approaches of fisheries management at a time when co-management is being promoted in other contexts. The present study assesses small-scale fishers' willingness to adopt the property rights comanagement scheme for water resource sustainability.

Study Area
In southeast Benin, there is an estuarine and lagoon complex named Lake Nokoué-Porto-Novo lagoon in the southeast, covering 180 km 2 and forming part of Ramsar site 1018. It is supplied with fresh water by the Sô and Ouémé rivers and subjected to marine influences through the channels of Cotonou and Badagry [13]. The two bodies of water maintain a permanent link through the three-kilometer-long Totchè channel ( Figure 1). This area was selected for the study following previous works [18,19] which demonstrated the existence of the problem of property rights on the water in these two towns.  The country is key-shaped and runs almost vertically from the Atlantic Coast in the south to the north. (Bottom): The study zone is located in southeast of Benin, along the coastal area. (Right): Estuarine and lagoon complex of Lake Nokoué-Lagoon of Porto-Novo in grey. The red point indicates the two surveyed towns "So-Ava" and "Les Aguégués", and in blue, there are the 4 sub-districts in which villages were chosen. Source: Made by authors.

Sampling
"Les Aguégués" and "So-Ava" are two districts with a lakeside lifestyle surrounding the lake that corresponds to the sampling area. The fishers living in these districts were sampled and respondents interviewed. Each district ("Les Aguégués" and "So-Ava") included several sub-districts and, consequently, villages. Thus, two sub-districts per district and two villages per sub-district were randomly selected. The sample was constituted through the stratified random sampling technique. The sampling frame corresponded to the estimated list provided by the village leaders. Fishers were chosen from each village according to its size in a random way. Based on Rea and Parker's [66] formula, a total of 251 fishers, including 181 from the "So-Ava" district and 70 from "Les Aguégués", were considered for the survey. To consider non-responses or incomplete questionnaires, estimated at 10%, the sample size is 277.

Theoretical Framework
The DCE combines consumer theory, experimental design theory, and econometric analysis and is grounded on the RUT and Lancaster's theory [67,68]. The RUT suggests that individuals associate a utility with each choice, and considering the utility maximisation behavioural rule, consumers choose the option that offers them the highest utility [56]. Yet, the utility is a latent construct that the researcher cannot observe [69]. In addition, Lancaster's theory states that products and services can be described using a set of characteristics (attributes). Therefore, the systematic utility can be represented by the attributes, levels, and individual characteristics [56]. Since the utility is a latent construct that the researcher cannot observe, it is represented by a systematic or measurable part and a random component [69].
Meanwhile, the random component contains an error term related to the unobserved preference variation [70]. The error term can also be defined as the difference between the actual utility and the utility captured by the estimated model [71]. More correctly, considering that V iq is the systematic utility of alternative i for individual q and ε iq is the random component associated with alternative i and individual q, the utility of alternative i for individual q (U iq ) is represented as follows: Since U iq is a random variable, the model cannot predict which exact alternative the individual will choose but the probability it will be selected.

Mixed Logit and Latent Class Logit Models
Different discrete choice models can be derived, assuming a specific probability distribution for the error terms. The multinomial logit (MNL) model, one that is further used, is obtained when the error terms are independently and identically distributed extreme values (IID) (the Gumbel hypothesis). In this case, the choice probabilities P iq can be easily calculated and are represented as: The MNL model shows independence from the irrelevant alternative property, which makes its use inappropriate to model choice situations when particular substitution patterns exist. To overcome these limitations, the alternative flexible model mostly used is mixed logit (MXL) [72,73]. The MXL makes it possible to detect any unobserved heterogeneity in preferences [74]. Given their flexibility, MXL models can approximate any random utility model and overcome the main limitations of the MNL [56]. Thus, it is possible to cope with random taste heterogeneity, free substitution patterns, and the panel correlation effect inherent to stated choice data under the MXL approach. In this study, we firstly used the MXL model to show heterogeneity between fishers' choices among co-management alternatives and the factors determining them. The utility function in mixed logit is formulated as follows: where γ is a parameter that varies with the random component δ i due to preference heterogeneity between individuals, V is the systematic utility of each alternative, and X n, is the vector of the attributes. The MXL estimates the probability that individual n will choose alternative i from a set of choice alternatives J as follows: The indirect utility function derived is as follows: where τ nk is a parameter vector that reflects the heterogeneity of preferences between individuals. It is assumed constant for all choice alternatives but varies across respondents. However, it may be easier to interpret heterogeneity by looking at discrete groups, especially if preferences might be very distinct [75]. We relax the assumption of preference homogeneity by assuming that fishers' preferences can be described by a finite set of distinct values [65]. This will lead to a latent class specification. The latent class logit (LCL) model does not violate the IIA hypothesis and differs from the MXL model as it admits that coefficient distribution can be discrete rather than continuous [76]. The benefit of an LCL over an MXL is that in the former, we, as researchers, do not have to make any distributional assumptions, but we do have to decide how many support points to include in our discrete distributions [77,78]. LCL uses a statistical methodology based on the concept of likelihood to identify the sources of heterogeneity at the segment level rather than the individual level, similar to the MXL model [79]. This model is increasingly applied in recent segmentation studies and generates good results [61,75,80].
Additionally, within property rights co-management alternatives, such segmentation of the fishers seems appropriate because they may have a different point of view [81]. The LCL model can be principally convenient for detecting sub-groups of people who could benefit from a common intervention based on their shared characteristics [82]. Therefore, we also estimated a latent class logit model where distinct classes numbered model heterogeneity. Considering that fisher i chooses options j from K co-management options in a choice set and assuming that the fisher belongs to segment s, with s ∈ S, the indirect utility function for the preferred fisher co-management profile j is written as follows: where X ij is a vector representing the attributes associated with K co-management options, β S are segment s and the parameter vector associated with the vector X ij , and ε ij/S is an error term. Assuming that the error terms are independently and identically distributed following the Gumbel distribution, the probability that fisher i chooses an alternative among K co-management options while belonging to a given segment is as follows: Now, consider M * ns = λ S Z n + ξ inS to be a function of the probability (P s ) belonging to the characteristics of fisher, and λ S (S = "2, 3, . . . S") are the specific parameters used to estimate each segment. We assume that the error terms ξ inS are IID between the fishers and segments, aligning with the Gumbel model. The probability that a fisher r belongs to segment s can be expressed as follows: By combining Equations (7) and (8), we obtain the following expression representing the probability that fisher i belongs to segment s and chooses K co-management options j: The log-likelihood function to be maximised to obtain parameters λ S and β S is expressed as follows: where l i is a dummy variable of observed choice.

Empirical Approach 2.4.1. Identification of Attributes and Choice Setting
The attributes and levels involved in our discrete choice experiments were determined through exchange with experts in the Beninese fisheries sector, local government officials, and previous studies [65,83]. According to Bateman et al. [84], four to six attributes with two to five levels per attribute are sufficient to characterise a good or service. When deciding on their property rights used for fishing, dwellings, and livelihood satisfaction, fishers will choose the co-management alternatives among the possible ones that maximise their utility. If none offers good utility, they will not adopt.
The co-management committee will consist of various actors such as the fisher's community representatives, the towns' administration and the public agents of fisheries, and the public sector structures in charge of the quality of life, health, transport and traffic, and other well-being services. In this configuration, the various zones' designation would result from negotiation between the co-management committee members. Considering both demographic growth and development issues would enable the committee actors to anticipate the need for space for a fisheries free access zone, socio-community services, and dwellings, and ultimately make institutional and regulatory proposals for sustainable settlements.
Thus, following the literature, five attributes and their levels varying between 2 and 5 were selected to describe the fishing property rights co-management scheme: (i) the area of the property on the water body that the fisher accepts to concede to the co-management scheme [85]; (ii) membership of the committee, of which the fisher could be required to personally be a member or one of his parents or one member of his community could be required to be involved in the committee [37]; (iii) social incentive: access to other income-generating productive and sustainable activities in water bodies or outside to build resilient livelihood systems and avoid Acadja settlement [86,87]; (iv) financial incentives: access to National Fund for Agricultural Development (NFAD) subsidy to invest in other activities [64]; (v) ecological incentive: availability of fishing space, no pollution in water bodies, and juvenile fish conservation where the fishers could obtain a guarantee that the water body will be clean and proper, without pollution caused by Acadja waste [88][89][90].
To test the relevance of the attributes to respondents, we conducted two focus groups with representatives of fishers using the different gear types (nets and Acadja). The levels of attributes retained from the focus group are presented in Table 1. Table 1. Selected co-management committee attributes and attribute levels.

Co-Management Schemes Attributes Attribute Levels
Water area conceded to co-management (WAC) Membership of co-management committee (1) The fisher must be involved in the committee (2) One community member involved in the committee (3) Fisher community members must be involved in the committee The second step of the choice experiment method was to develop choice cards. Combining the five selected attributes and their respective levels generated 5 × 3 × 2 × 2 × 3 = 180 co-management schemes profiles. Using the orthogonal design method in SPSS v25, 24 realistic and applicable co-management schemes profiles were selected, considering the literature about co-management and participatory management in fisheries and focus group discussions. Choice cards were constructed by randomly pairing the profiles and using a status quo option as a reference. The status quo option refers to fishers' current management practices for property rights on water bodies. Twelve (12) cards with three options (two co-management schemes, profiles options, and status quo) were constructed. One of the choice cards is shown in Table 2.

-Management Schemes Attributes Attribute Levels
ter area conceded to co-management (WAC) mbership of co-management committee (1) The fisher must be involved in the committee (2) One community member involved in the committee (3) Fisher community members must be involved in the committee cial incentive (agree with activity ersification) The second step of the choice experiment method was to develop choice cards. Combining the five selected attributes and their respective levels generated 5 × 3 × 2 × 2 × 3 = 180 co-management schemes profiles. Using the orthogonal design method in SPSS v25, 24 realistic and applicable co-management schemes profiles were selected, considering the literature about co-management and participatory management in fisheries and focus group discussions. Choice cards were constructed by randomly pairing the profiles and using a status quo option as a reference. The status quo option refers to fishers' current management practices for property rights on water bodies. Twelve (12) cards with three options (two co-management schemes, profiles options, and status quo) were constructed. One of the choice cards is shown in Table 2. Data were collected with a structured two-section questionnaire. The first section concerned the socio-demographic questions (age, education, fishing experience, fishing association membership, access to extension services, etc.). In the second section, the fishers were asked to choose a property rights co-management option (A or B) or their current practice (option C) in the choice game. Attributes with more than three levels have been disaggregated (n − 1) by considering an attribute level as a reference. In the model, status quo, which was designed as a dummy, was equal to 1 if respondents chose their current practice (option C) and 0 otherwise (option A or B). ASC is an alternative specific constant which captures the utility corresponding to the status quo.  bership of co-management committee (1) The fisher must be involved in the committee (2) One community member involved in the committee (3) Fisher community members must be involved in the committee l incentive (agree with activity sification) The second step of the choice experiment method was to develop choice cards. Combining the five selected attributes and their respective levels generated 5 × 3 × 2 × 2 × 3 = 180 co-management schemes profiles. Using the orthogonal design method in SPSS v25, 24 realistic and applicable co-management schemes profiles were selected, considering the literature about co-management and participatory management in fisheries and focus group discussions. Choice cards were constructed by randomly pairing the profiles and using a status quo option as a reference. The status quo option refers to fishers' current management practices for property rights on water bodies. Twelve (12) cards with three options (two co-management schemes, profiles options, and status quo) were constructed. One of the choice cards is shown in Table 2. Data were collected with a structured two-section questionnaire. The first section concerned the socio-demographic questions (age, education, fishing experience, fishing association membership, access to extension services, etc.). In the second section, the fishers were asked to choose a property rights co-management option (A or B) or their current practice (option C) in the choice game. Attributes with more than three levels have been disaggregated (n − 1) by considering an attribute level as a reference. In the model, status quo, which was designed as a dummy, was equal to 1 if respondents chose their current practice (option C) and 0 otherwise (option A or B). ASC is an alternative specific constant which captures the utility corresponding to the status quo.

Co-Management Schemes Attributes Attribute Levels
Water area conceded to co-management (WAC) Membership of co-management committee (1) The fisher must be involved in the committee (2) One community member involved in the committee (3) Fisher community members must be involved in the committee Social incentive (agree with activity diversification) The second step of the choice experiment method was to develop choice cards. Combining the five selected attributes and their respective levels generated 5 × 3 × 2 × 2 × 3 = 180 co-management schemes profiles. Using the orthogonal design method in SPSS v25, 24 realistic and applicable co-management schemes profiles were selected, considering the literature about co-management and participatory management in fisheries and focus group discussions. Choice cards were constructed by randomly pairing the profiles and using a status quo option as a reference. The status quo option refers to fishers' current management practices for property rights on water bodies. Twelve (12) cards with three options (two co-management schemes, profiles options, and status quo) were constructed. One of the choice cards is shown in Table 2. Data were collected with a structured two-section questionnaire. The first section concerned the socio-demographic questions (age, education, fishing experience, fishing association membership, access to extension services, etc.). In the second section, the fishers were asked to choose a property rights co-management option (A or B) or their current practice (option C) in the choice game. Attributes with more than three levels have been disaggregated (n − 1) by considering an attribute level as a reference. In the model, status quo, which was designed as a dummy, was equal to 1 if respondents chose their current practice (option C) and 0 otherwise (option A or B). ASC is an alternative specific constant which captures the utility corresponding to the status quo.
Data were collected with a structured two-section questionnaire. The first section concerned the socio-demographic questions (age, education, fishing experience, fishing association membership, access to extension services, etc.). In the second section, the fishers were asked to choose a property rights co-management option (A or B) or their current practice (option C) in the choice game. Attributes with more than three levels have been disaggregated (n − 1) by considering an attribute level as a reference. In the model, status quo, which was designed as a dummy, was equal to 1 if respondents chose their current practice (option C) and 0 otherwise (option A or B). ASC is an alternative specific constant which captures the utility corresponding to the status quo.

Models' Specification
For the MXL model, the basic model explains the importance of the defined attributes in the fishers' choice. The explanatory variables included in this model are water area conceded to co-management (WAC), fisher must be co-management committee member (FCM), fisher family member must be co-management committee member (FFC), social incentive, agree to activity diversification (SI), financial incentive, agree to NFAD subsidy (FI), no water pollution as ecological incentive (NWP), more space available as ecological incentive (MSA), and ASC. The indirect utility function of individual n opting for a choice set i can be formulated as follows: where α are the parameters to be estimated. The interaction model includes the socioeconomic characteristics of fishers as interacting variables with ASC. The interaction model was specified as follows: 6 NWP in + α 7 MSA in + α 8 ASC * Age n + α 9 ASC * Exp n + α 10 ASC * Educ n + α 11 ASC * Fsize n + α 12 ASC * Assoc n + α 13 ASC * ManualC n + α 14 ASC * MotorC n + α 15 ASC * Acadja n .
The LCL model is written as follows: where β 0j is the constant profile j, β .i represents the coefficients of the explanatory variables, and λ ij is a composed error term. A statistically significant and negative partial coefficient associated with the interaction between any variable and ASC indicates that the variable generates a higher probability that fishers will choose the co-management options, while a positive partial coefficient indicates a higher probability that fishers will choose the status quo. The socio-economic factors influencing co-management adoption were tested using the interaction equation.
Socio-economic variables are modelled through interactions with ASC. Thus, a statistically significant and negative partial coefficient of the interaction between any variable and the ASC shows that the variable generates a higher probability that fishers will choose the alternative co-management options. Thus, a positive partial coefficient indicates a higher likelihood that fishers prefer the status quo.
The socio-economic variables included in the MXL and LCL models were fishers' characteristics, and the co-management schemes attributes, as described in Table 3 Prior to latent class model estimation, the first step in estimating was the determination of the optimal number of classes and choosing the best class for analysis. The best model is the one with the lowest BIC value [82,91]. In Table 4, the model information criteria show that the BIC was minimised to four (4) segments. Therefore, a four (4)-segment model was selected to better explain the heterogeneity of preferences.

Socio-Demographic and Fishing Characteristics
The fishers in the study area have an average age of 50 with 35 years of professional fishing experience ( Table 5). The average number of dependents of these fishers is nine.
Sixty-six percent of the fishers have no formal education, compared to 24% who have primary education and 9% who have secondary education. In addition, 64% are not literate in their local language. Only 14% of the fishers are members of fishers' associations, and among them, 64% always respect the decisions taken in the association. Concerning fishing practices, the fishers in the study area go fishing on average five days a week, especially in periods of the highest fish abundance (March, April, May, and June). They work an average of 3 days per week for the rest of the year. Concerning fishing methods, 83% of the fishers work in open spaces, free to access, using gear such as still nets, drag nets, dip nets, hawks, pots, lines, longlines, crab scales, etc. In addition, 62% of the fishers practice fishing in restricted access areas with fixed gear, such as Acadja. Regarding the use of Acadja, 62% of the fishers have only one installation, as opposed to 23% who have two, and the rest have more than two Acadja installations. To move around on the water, 96% of the fishers have rowing dugout canoes, and 32% have motorised dugout canoes. About the labour force, 19% of the fishers work alone while 68% employ either family or casual labour. Only 2% of the fishers employ permanent workers. Table 6 shows the results of the MXL model estimation. The basic model is globally significant at 1%. All the coefficients associated with the attributes are significant at 1% except the coefficients of the attribute "one fisher family member involved in the committee", which is significant at 5% and the coefficient of attribute "ecological motivation (no water pollution)" which is not significant. It indicates that the attributes "water area conceded to co-management", "fisher must be involved in the committee", "agree with activity diversification", and "agree with NFAD subsidy" significantly determine the probability that fishers choose a co-management option. The coefficients associated with the attributes "agree with NFAD subsidy", "agree with activity diversification", and "more space available" are positive. Results indicate that the less the fishers access NFAD subsidy and diversification activities, the less their utility would increase. Additionally, they are motivated to contribute to making more space available for fishing for co-management establishments.

Mixed Logit Models
The coefficients associated with the attributes "a fisher must be involved", "fisher's family members must be committee member", and "water area conceded to co-management" are negative. It indicates that the more the fishers or at least one member of his family are involved in the committee, the more they are willing to adopt co-management options. In addition, fishers are motivated to concede water areas (Acadja, dwellings, and other community areas) to contribute to co-management establishment. The results also reveal significant standard deviations of the coefficients associated with the attributes. It means that fishers have effective heterogeneous preferences concerning the attributes "a fisher must be involved", "agree with activity diversification", and "water area conceded to co-management". The results of the interaction model show that age, fishing experience, membership in a fishers' association, and ownership of a motorised canoe significantly determine the fishers' choice. The negative sign associated with the fishing experience indicates the ability of more experienced fishers to opt for co-management options. The same trend is observed with fishers included in fishing associations. In contrast, the positive sign associated with fishers' age and ownership of a motorised canoe indicates that if fishers are not older or owners of motorised canoes, they are unwilling to adopt co-management options.

The Latent Class Logit Model
LCL models with different numbers of classes were estimated and compared using the Bayesian information criterion (BIC). The variables such as education, years of fishing experience, fisher's family size, membership in fishers' association, manual and motorised canoe ownership, and Acadja ownership were significantly relevant to characterise the classes of fishers (Table 7). Fishers in class 1 were likelier to have less fishing experience than those in other classes. Fishers in class 2 were likely to be more educated, have a larger family size, and be older but have fewer Acadja than other classes. Class 3 fishers were likely to own Acadja but had less fishing experience than others. Class 4 comprises older, more experienced fishers and Acadja owners as a priority, compared to other classes. Fishers in classes 1, 2, 3, and 4 represented 22%, 10%, 24%, and 44% of the sample.
The model showed that all co-management attributes were significantly relevant to the choices made by fishers on the cards except the attribute "no water pollution". Additionally, the parameter of the ASC is significant and negative for class 4 only. It expresses that only these fishers found their utility increased with co-management options and are willing to adopt them. The non-significance of the status quo for classes 1, 2, and 3 does not allow us to capture the preference of these classes' fishers for co-management options. The "water area conceded to co-management" parameter was negatively significant only for class 4. This shows that class 4 fishers are ready to concede area on the water body and are willing to adopt co-management options. The attribute "agree with NFAD subsidy" parameter was significant and positive for classes 1 and 4 and negative for class 3. It shows that class 3 fishers' utility will increase if they are granted a subsidy. Additionally, the less the fishers of classes 1 and 4 receive a grant, the less their utility will increase, and the less class 4 fishers will adopt co-management options. The parameter of the attribute "a fisher must be involved" was significant and positive for class 4 and negative for class 1. It specifies that the less the class 4 fishers are involved in the committee, the less their utility will increase. Conversely, the more class 1 fishers are engaged in the co-management committee, the more their utility will grow. In the same trend, the utility of class 3 fishers will grow if at least one of their family members is on the co-management committee.
Furthermore, the "agree with activity diversification" parameter is significant and positive for classes 1 and 4. It points out that their utility will rise if they have access to other income-generating activities while adopting co-management options, especially for class 4 fishers. The parameter associated with the attribute "more space available" is significant and positive for class 3 and negative for class 4. This shows the class 4 fishers' tendency for extensive area availability conversely to class 3, who do not find this profitable for their utility. Table 7. Latent class model results ( a = ASC (status quo) is current management practices (1 if the respondent chooses the status quo and 0 otherwise). Numbers without brackets are estimated parameters; numbers in brackets are standard errors of the estimated parameters. *, **, *** indicate statistical significance at 1, 5, and 10 percent levels, respectively. Class 1 was considered as the reference. This means that a positive parameter indicates a higher probability that the respondent with a given characteristic is a member of class 2, 3, or 4 compared to class 1. Conversely, a negative parameter indicates a higher probability that the respondent is a member of class 1 compared to class 2, 3, or 4).

Discussion
Fishers' individual preferences differ in several ways. It is therefore challenging to identify the co-management options that are suitable solutions for all fishers together. Whether improving dwelling installation, fixed fishing gear (Acadja) repartition, or free fishing area allocation, the co-management options are likely to have both advocates and critics.
The mixed logit model's estimation results show that the ASC parameter is significant and negative. This result indicates that fishers globally prefer co-management options and are ready to abandon the current situation (status quo) of property rights management on water bodies. These findings conform to those of Masud et al. [90], who showed that most of Malaysia's fishers acknowledged the co-management approach as necessary to conserve and develop diverse natural resources. Additionally, the co-management process increased participation alongside trade unions, producer organisations, and scientists, as expressed by [92]. However, co-management adoption and establishment must avoid shifting the burden of responsibility onto resource users' local institutions to overcome dilemmas. This shift in responsibility should avoid neglecting the nuanced understanding of the realities of many resource-dependent communities, including the disparity in users' access to resources and the social inequality and poverty they face [88,93,94].
As well, the results of the latent class model indicate that class 4 (44% of the sample) involved the leading adopters. These fishers are the oldest in the sample, are part of fishers' associations, and are Acadja owners. The less they are individually involved in the co-management committee with access to income-generating activities, the less they are willing to adopt co-management options. In agreement with these findings, Villamayor-Tomas et al. [48] related that further integrating farmers in the design of agrienvironmental schemes with both monetary and social incentives could influence their adoption and participation in such programs. Jentoft [95] reported that together with institutional building (committee involvement), capacity building (social incentive) plays an essential role in facilitating the participation of fishers in co-managing fisheries. Hossain and Banik [96] also suggested that social capital is the primary determinant of fishers' resilience in the co-managed fisheries systems and should be reinforced.
In sum, the membership in fishers' associations, the involvement in co-management committees, and the respect for their desire to would allow for solid institutional arrangements between fishers and other fisheries stakeholders. These findings agree with Varughese and Ostrom's [97] and Poteete and Ostrom's [98] findings that institutional wellsuited local users' preferences should promote their willingness to co-manage resources. As part of their willingness to adopt, these fishers would like to have a subsidy. This result follows Czajkowski et al.'s [99] findings, which led to broader adoption of extensive farming practices requiring a high subsidy level increase. These results also confirmed those of Jara-Rojas, Bravo-Ureta, and Díaz [100], who presented farmer access to subsidies as positively associated with water irrigation technology adoption. According to Notohamijoyo et al. [101], in Indonesia, subsidy programs for small-scale fisheries were demonstrated to create benefits to the well-being of the fishers and fisheries' sustainability when focused on fishing vessels, vessel machines, and environmentally friendly fishing gear. From a co-management perspective, unemployment insurance subsidy implementation was suggested by shellfish harvesters to improve fishery sustainability during the closed period in northeast Brazil [102]. Furthermore, Rodriguez-Canul et al. [103] advocated a subsidies program set up by the Mexican federal government to improve women's inclusion in fishing organisations for protected area development and conservation.
However, Symes, and Phillipson [104] argued that support for the artisanal fisheries sector could be provided without a financial subsidy. Several forms of action are possible: (i) granting preferential access to coastal waters for vessels under a given size, (ii) limiting the transferability of fishing rights granted to local coastal vessels, and (iii) relaxing some of the regulations surrounding licensing and quota restrictions. In a country such as Benin, where accurate fisheries information, such as catch and effort data, is scarcely available, measures such as a fishing quota, access permit, etc., seem to be not applicable. Thus, fishery subsidies might serve as significant livelihood support for low-income small-scale fisheries [105]. There are, therefore, advantages to providing subsidies and grants for supporting fisheries' well-being and sustainability [106]. As Sakai, Yagi, and Sumaila [51] emphasised, the challenge is to direct these subsidies toward the real needs of the fishers in the socio-ecological systems and avoid overexploitation.
However, the fishers of classes 1 (22% of the sample) and 3 (24% of the sample) own fixed gear (Acadja) and are not members of fishers' associations. Their utilities will increase when receiving subsidies and activity diversification support. Nonetheless, they would not concede any water area for co-management option implementation. If conceding water area for co-management is considered a payment, these fishers are not willing to pay but want to receive subsidies and social incentives to participate in the process. This result confirms Phong, Thang, and Hoai's [61] research which indicated that Vietnamese farmers are unwilling to pay for good aquaculture practices but requested a subsidy to treat wastewater using biological processes. Furthermore, this result seems to demonstrate a lack of trust and loss of faith between individual fishers and fishers' associations' leaders in one part and towards fishery authorities in the second part, as noted in southeast Benin by Sonneveld [22]. These fishers could probably meet their utility goal in conceding areas on the water bodies to contribute to the co-management process if they were confident of the transparency of the process. As confirmed by Trimble and Plummer's [107] findings, trust and communication are essential for co-management of social-ecological systems. If they are missing, the committees will not work since fishers will doubt their partners and vice versa. Murunga, Partelow, and Breckwoldt [108] emphasised that the linkage between leadership and trust is essential for promoting strong stakeholder interactions and the emergence of collective action in social-ecological systems. Though fisheries governance through co-management promotes interplays between fishers' communities and the government, the lack of trust could lead to the perception that the government would reinforce its current management rules and remove the fishers' property rights.
Finally, fishers of class 2 (10% of the sample) do not meet their utility goal in adopting property rights co-management options. Since they do not use fixed equipment such as Acadja, class 2 fishers cannot see the adoption of co-management of properties as a priority. Therefore, even without co-management, their fishing activity could continue. This result is in agreement with Pita, Pierce, and Theodossiou's [109] and Quynh et al.'s [110] findings. They found that mobile gear fishers do not perceive the necessity for fishing restrictions, while fixed gear fishers perceive the need for fishing restrictions.

Conclusions
Co-management has been advocated worldwide under the assumption that fisher participation in resource regimes increases the authority of decisions, reduces transaction costs, and contributes to resource sustainability. This study focused on determining smallscall fishers' willingness to adopt property rights co-management in the Lake Nokoué and Porto-Novo Lagoon complex in southern Benin. Applying the discrete choice experiment approach shows that less than half of fishers are willing to adopt such co-management schemes. However, more fishers can be converted to adopters if appropriate schemes are devised. The socio-ecological context of southern Benin fisheries recommends helping fishers diversify their livelihood assets and reduce fishing time to contribute to property rights co-management.
This study demonstrates that some fishers do not want to concede water area to contribute to co-management establishment. Therefore, some questions arise: Will fishers who only have space for dwellings be able to access the same facilities as those who also have space for fixed gear? How can we ensure that the areas formerly under Acadja are not taken over again by other fishers? Considering the local context, how could this co-management be operationalised? It will probably be necessary to set up solid institutional trust agreements between fishers at the fishers' association level and with the government and relative stakeholders. Furthermore, capacity building, subsidy, and livelihood diversification programs should be explored.