The Temporal Dynamics of the Impact of Overfishing on the Resilience of the Sarotherodon melanotheron (Rüppel, 1858) Fish Species’ Population in the West African Lake Toho

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The manuscript is a valuable contribution, with robust methodology and practical recommendations. Revisions to improve readability, figure quality, and methodological detail will strengthen it.

The introduction is overly broad in parts, discussing general aquatic ecosystem stressors that are not directly relevant to the study’s focus. Some regional studies (e.g., Lederoun et al., 2015) are cited, but others from similar West African lakes could strengthen the context.

The research design could be strengthened by addressing potential confounding factors (e.g., changes in fishing effort, environmental conditions) and justifying the sample size difference (3511 vs. 9161 individuals).

The methods are well-described however, some details are lacking, such as the specific water temperature used for mortality estimates and the rationale for using different maturity staging protocols (Micha/Laleye vs. Brown-Peterson) between periods.

Figures 8–10 are cluttered and/or poorly labeled, reducing clarity small font sizes, and unclear labels, making interpretation difficult. Captions lack sufficient context).

Correct use of inconsistent terminology (e.g., "2022-2024" in Table 4, size at first capture LC50).

The conclusions are largely supported by the results, however the claim of neoteny as an adaptive response is speculative without direct evidence, and the link to food security could be better substantiated with socio-economic data.

Author Response

The manuscript is a valuable contribution, with robust methodology and practical recommendations.

DEAR REVIEWER 1 THANK YOU FOR YOUR APPRECIATION!

 

Revisions to improve readability, figure quality, and methodological detail will strengthen it.

THANK YOU FOR YOUR KIND SUGGESTIONS WE WILL FOLLOW THEM ACCORDINGLY TO THE PAPER GOAL AND PURPOSES.

 

The introduction is overly broad in parts, discussing general aquatic ecosystem stressors that are not directly relevant to the study’s focus.

THIS IS BECAUSE THE AUTHORS WANT TO MAKE THE PAPER OF POTENTIAL INTEREST FOR AS LARGER AS POSSIBLE GROUP OF FUTURE READERS. THIS RELATIVELY BROAD INTRODUCTARY CONTEXT HELP SUCH GENERAL POTENTIAL READERS TO HAVE AN INITIAL CLUE ABOUT  WHY AND WHAT THE NEXT INFORMATION WILL COME. IF YOU CONSIDER AS BEING APPROPRIATE PLEASE ALLOW THIS INTRODUCTARY PART TO REMAIN OR SUGEST WHAT CHANGES YOU STILL CONSIDER.

 

Some regional studies (e.g., Lederoun et al., 2015) are cited, but others from similar West African lakes could strengthen the context.

DONE

Previous observations on this species, reported by Lederoun et al. [31], suggested exploitation of the population at that time. Similarly, in Lake Nokoué, Lederoun et al. (Lederoun D, Amoussou G, Baglo IS, Adjibogoun H, Vodougnon H, Moreau J, Lalèyè  P. 2020. Growth, mortality and yield of Sarotherodon melanotheron melanotheron (Rüppell, 1852) in the Lake Nokoué and Porto-Novo Lagoon complex Benin, West Africa. Aquatic Living Resouces 33(18). https://doi.org/10.1051/alr/2020018.) estimated that the Sarotherodon melanotheron population is underexploited. In contrast, in Lake Ahémé, Benin, the stock of Sarotherodon melanotheron is overexploited and requires conservation measures. These include ecosystem restoration through the systematic removal of destructive fishing gear and methods, enforcement operations, awareness campaigns among local communities about sustainable fishing practices, and the establishment of no-fishing zones to protect breeding grounds and ensure continuous replenishment of fish stocks (Viaho CC, Lederoun D, Baglo IS, Ahouansou Montcho S, Adandédjan D, Agblonon Houelome T, Gbedey NM, Laleye P. 2021. Paramètres de population et taux d’exploitation de Sarotherodon melanotheron melanotheron Rüppell (1852, Cichlidae) et Ethmalosa fimbriata (Bowdich, 1825, Clupeidae) dans le lac Ahémé et ses chenaux avant le dragage (Bénin, Afrique de l'Ouest). International Journal of Biological and Chemical Sciences 15(5) :1991-2007. https://doi.org/10.4314/ijbcs.v15i5.24). At the Ayamé reservoir lake (Côte d’Ivoire, West Africa), Gouré Bi et al. (Gouré Bi TF, Yeo GM, Amian AFR, Niamien KJ, Blé MC. Age et croissance du tilapia estuarin Sarotherodon melanotheron dans le lac de barrage d’Ayamé 1 (Côte d’Ivoire, Afrique de l’Ouest). Journal of Applied Biosciences 191 : 20219-20230. https://doi.org/10.35759/JABs.19.14.) revealed that the S. melanotheron population is experiencing overexploitation, characterized by intensive fishing of small-sized individuals and a high proportion of one-year-old fish.

 

The research design could be strengthened by addressing potential confounding factors (e.g., changes in fishing effort, environmental conditions) and justifying the sample size difference (3511 vs. 9161 individuals).

DONE IN THE TEXT:

The difference in sample sizes between 2002-2003 and 2022-2023 is mainly explained by several factors. First, human resources have improved: in 2022–2023, sampling was carried out with the support of two assistants, which allowed more effective coverage of sampling sites and a greater volume of data collection.

Second, awareness campaigns led by agents of the Departmental Directorate of Agriculture, Livestock, and Fisheries of Mono (the department where Lake Toho is located) helped foster better collaboration with fishers. Now more aware of the scientific value and the need to protect declining fishery resources, fishers are more willing to voluntarily bring fish specimens to our laboratory. Refusing these contributions could jeopardize ongoing cooperation.

Lastly, the data were collected as part of a doctoral research project, requiring a solid and representative dataset to support relevant recommendations for the authorities responsible for the sustainable management of the lake.

 

The methods are well-described however, some details are lacking, such as the specific water temperature used for mortality estimates and the rationale for using different maturity staging protocols (Micha/Laleye vs. Brown-Peterson) between periods.

DONE IN THE TEXT

Why use Micha's scale in 2002-2003 and Brown & Peterson's scale in 2011

This choice was made in the spirit of scientific integrity and methodological consistency. The gonadal maturity stages for the 2002–2003 data were determined using Micha’s scale (1973), in accordance with the standards available at the time. In contrast, the more recent scale by Brown-Peterson et al. (2011) was applied to the 2022–2023 data due to its greater precision and its widespread use in recent scientific literature.

It should be noted that the two approaches are not fundamentally different. Micha’s scale is based on macroscopic morphological criteria such as gonad size, color, and turgidity. Brown-Peterson’s scale incorporates these criteria and adds histological observations, such as the presence of vitellogenic or atretic oocytes. Therefore, while the two scales differ in their level of detail, they remain consistent in their descriptive logic of gonadal development stages.

Water temperature

In Benin, and more specifically in the Lake Toho region (Mono department), air temperature has shown little variation, as indicated by data from the National Meteorological Agency collected between 1993 and 2023. This stability is also reflected in water temperature. In 2002–2003, the average water temperature was 28.80 °C, compared to 28.82 °C in 2022–2023. For analytical consistency, the FiSAT II software retained a temperature of 28.80 °C for both study periods.

 

Figures 8–10 are cluttered and/or poorly labeled, reducing clarity small font sizes, and unclear labels, making interpretation difficult. Captions lack sufficient context).

FIGURES REPLACED

 

Correct use of inconsistent terminology (e.g., "2022-2024" in Table 4, size at first capture LC50).

DONE IN THE TEXT

 

The conclusions are largely supported by the results.

THANK YOU

, however the claim of neoteny as an adaptive response is speculative without direct evidence,

IF YOU CONSIDER THE BELOW TEXT AS BEING NOT ENOUGH WE CAN DELETE THE NEOTENY PROPOSITION

Pullin [63] highlight that in cichlids, including S. melanotheron, neoteny promotes early maturation, allowing for rapid reproduction despite the reduction in the average size of individuals

 

and the link to food security could be better substantiated with socio-economic data.

WE EXPANDED ACCORDINGLY THE RELATED TEXT AS IS IN THE TEXT NOW AND BELOW

This situation explains the declining fish resources widely reported by fishers and the gradual reduction in the contribution of fisheries to food security, nutrition, the economy, and the well-being of fishing-dependent communities. Fishing plays a significant role in ensuring food security, production of several relatively localities can supply major urban centers, while traditional fisheries support rural areas (Akou Loba V, Gbitry Bolou A. 2018. La problématique du développement dans l’Ouest de la Côte d’Ivoire. Eléments de diagnostics et de réflexion. Archives nationales de Côte d’Ivoire. 37p.) Analysis of the factors contributing to the degradation of fishery resources, shows that the lakes can be overexploited due to the intensification of fishing activities, poor fishing practices, the establishment of illegal fishing camps, and weak enforcement of regulations, leading to the progressive decline of fish stocks (Koigny KJH, Diarrassouba A, Yelkouni M, Assie DRH. 2024. Analyse des facteurs de dégradation des ressources halieutiques du lac Buyo dans la Réserve de biosphère Taï en Cote d’Ivoire. Vertigo. 24(1). https://doi.org/10.4000/vertigo.42927). In the relatively similar with our studied lake, namely in the Ahémé Lake, the stock of S. melanotheron is overexploited, requiring protective measures, including ecosystem restoration through the systematic removal of destructive fishing gear and techniques, enforcement actions, raising awareness among local populations about sustainable fishing methods, and creating biological reserve areas where fishing is prohibited to preserve breeding grounds and ensure the continuous removal of fish stocks (Viaho CC, Lederoun D, Baglo IS, Ahouansou Montcho S, Adandédjan D, Agblonon Houelome T, Gbedey NM, Laleye P. 2021. Paramètres de population et taux d’exploitation de Sarotherodon melanotheron melanotheron Rüppell (1852, Cichlidae) et Ethmalosa fimbriata (Bowdich, 1825, Clupeidae) dans le lac Ahémé et ses chenaux avant le dragage (Bénin, Afrique de l'Ouest). International Journal of Biological and Chemical Sciences 15(5) :1991-2007. https://doi.org/10.4314/ijbcs.v15i5.24.). Also, according to Kantoussan (Kantoussan J. 2007. Impacts de la pression de pêche sur l’organisation des peuplements de poissons : application aux retenues artificielles de Sélingué et de Manantali, Mali, Afrique de l’Ouest. Thèse de doctorat d’Agrocampus Rennes. 195 p.), in Sélingué Lake, large-sized species following a K-strategy have become rare in fish landings, they are now dominated by small-sized, low-biomass species following an r-strategy, posing a threat to food security in the region.

 

 

 

Reviewer 2 Report

Comments and Suggestions for Authors

First of all, there are some spelling errors in the suggested article. These should be corrected. Example: (Line 12 throuch, line 13 preassure, line 31 leas, line 45 undoubtly, line 46 irreplaceble, line 59 last but least, line 98 exposed, line 112 implicitelly, line 180 determinded, line 265 wich, table 1 mini and maxi are some of them)

I recommend that writers remove the second paragraph from the introduction. This adjustment will enhance the transition and connection between the paragraphs. If necessary, the sentences from the second paragraph can be integrated into the appropriate materials and methods sections.

Figure 1 appears quite complex. To improve clarity, the area covered by the lake could be highlighted using a different colour or pattern. In the upper left corner of the map, the African continent is displayed alongside the location of Benin. However, I am unclear about what the second figure next to it represents. Additionally, enlarging the numbers and text on the map would enhance readability. I suggest that the authors take the opportunity to redesign and enhance Figure 1 for improved clarity and impact.

I believe that Figures 2 to 7 are unnecessary and should be removed to improve the quality of this work.

Along with the minimum and maximum length and weight data in Table 1, the average length, average weight, and their standard deviations should also be provided in separate columns.

In Table 1, the total number of females, males, immature individuals, and those classified as undetermined reported from April 2022 to March 2023 is 9158. This figure is incorrect as it is stated as 9161 in the table and line 171. Additionally, could you clarify the difference between "immature" and "undetermined", as noted in Table 1? It is also worth noting that the number of immature individuals was very low (30) from 2002 to 2003, while the number of undetermined individuals was significantly high at 1823. What might explain this discrepancy?

In Table 1, the number of immature individuals (recruits to the stock) in the 2022-2023 samples is significantly higher than in the 2002-2003 samples. What could be the reason for this increase, and how does this situation affect the average length?

In lines 177-180, it is mentioned that an ANOVA test was used to compare the total lengths (Lt) of female individuals to those of male individuals. However, I did not find any sentence or evaluation of this analysis in the results section. It seems that the analysis was only presented in Figure 8. Additionally, the sentence referring to Figure 8 (lines 284-288) includes information and explanations irrelevant to the figure. Furthermore, I believe the title of Figure 8 is inadequate; it should have a descriptive title that accurately reflects the figure's content. In Figure 8, the upper left graph should be marked as A, the upper right graph as B, and the lower graph as C, and these should be included in the figure title with explanations. As an extra note, I think there would be a fourth graph (because there are two p<0.001 and a total weight text with no connection in the graph) in Figure 8. However, the authors did not realize they could not include it due to a technical problem. Alternatively, the possible graph does not appear in the pdf file I examined.

In Figure 8, the length distributions for male and female individuals should be displayed separately for the 2002-2003 and 2022-2023 samples. Additionally, it would be beneficial to present the length distributions of immature and undetermined individuals in separate graphs to provide more detailed information.

Reductions in average length should only account for individuals whose sex has been identified. Analyses and evaluations should be based solely on these results. Data from immature and unidentified individuals should be excluded from the calculations, and this information should be detailed in the materials and methods section.

The data for individuals in the smallest length class range (2-4 cm) and the largest length class range (>26 cm for the 2002-2003 samplings and >18 cm for the 2022-2023 samplings) presented in Table 1 are not visible in Figures 8a and 8b.

Several errors in Figure 9 need to be addressed. First, the graphs do not display the distribution of measurement values that the curves represent; only the curves themselves are visible. The values for mature individuals should be indicated as points for females, while a different shape or colour should be used for males. Additionally, Figure a lacks values on the X-axis, and the line that should intersect the X-axis for females does not start at the correct intersection point on the Y-axis. In Figure b, the line that is supposed to intersect the Y-axis at 50% intersects at approximately 58% for females, and there is no corresponding line for males. Furthermore, the labels for females and males in Figure b appear to be written in French. Overall, this figure needs to be redrawn.

Table and figure titles need to be renumbered; there are multiple errors in the order that should be corrected.

The materials and methods section does not include the chi-square test mentioned in line 334. Authors should add it to the relevant section.

In line 336, the table order should be 2, not 1.

The total number of individuals listed in Table 2 does not match the sum of the identifiable female and male individuals reported in Table 1. For the 2022-2023 samples in Table 1, the total is 6716, while Table 2 states it as 6710. Similarly, for the 2002-2003 samples, the total in Table 1 is 1623, but Table 2 indicates it as 1604.

In Table 2, Taotal should be corrected as total.

Table 3 shows that the total number of individuals in the 2022-2023 samples is 9131. Is the correct number 9158, 9161, or 9131?

Growth parameters should be presented in a table format for females, males, and the total for both sampling periods (as shown in Table 5) instead of as figures. Consequently, Figure 7 should be removed.

Author Response

DEAR REVIEWER 2

THANK YOU FOR YOUR ENCOURAGING AND SUPPORTING APPROACH.

 

First of all, there are some spelling errors in the suggested article. These should be corrected. Example: (Line 12 throuch, line 13 preassure, line 31 leas, line 45 undoubtly, line 46 irreplaceble, line 59 last but least, line 98 exposed, line 112 implicitelly, line 180 determinded, line 265 wich, table 1 mini and maxi are some of them)

ALL THE SUGGESTED CORRECTIONS WERE DONE AND A SPELLING CHECK ALSO.

 

I recommend that writers remove the second paragraph from the introduction. This adjustment will enhance the transition and connection between the paragraphs. If necessary, the sentences from the second paragraph can be integrated into the appropriate materials and methods sections.

THANK YOU FOR THE SUGGESTION AND OPTION. THE SUGGESTED PART WAS INTEGRATED INTO THE SUGGESTED MATERIAL AND METHODS SECTION

 

Figure 1 appears quite complex. To improve clarity, the area covered by the lake could be highlighted using a different color or pattern. In the upper left corner of the map, the African continent is displayed alongside the location of Benin. However, I am unclear about what the second figure next to it represents. Additionally, enlarging the numbers and text on the map would enhance readability. I suggest that the authors take the opportunity to redesign and enhance Figure 1 for improved clarity and impact.

DONE AND REPLACED IN THE TEXT Figure 1 has been revised. It now focuses exclusively on the study area, namely Lake Toho, located in Benin. For this reason, the map of Benin is presented first. To help readers who may not be familiar with Benin’s geographic location, a map of Africa has also been included, clearly indicating the country’s position. It is also worth noting that the map of Africa includes Madagascar, an island located in the Indian Ocean, which is often displayed alongside the African mainland although it is geographically separate.

 

I believe that Figures 2 to 7 are unnecessary and should be removed to improve the quality of this work.

FIFURES 2-7 WERE DELETED FROM THE PAPER FOLLOWING THE REVIEWER 2 OPINION.

 

REGARDING THE REVIEWER 2 OBSERVATIONS ABOUT TABLE 1, WE CHANGED THE TABLE IN THE PAPER

 

In lines 177-180, it is mentioned that an ANOVA test was used to compare  ................

The ANOVA test (Analysis of Variance) was used to assess whether there were significant differences between the study periods regarding the mean total length and mean total weight of S. melanotheron individuals, regardless of sex. This statistical test helps determine whether the observed variations in means are attributable to effects related to the sampling period or simply to random variation.

 

In Figure 8, the length distributions for male and female individuals should be displayed separately for the 2002-2003 and 2022-2023 samples.

DONE ACCORDINGLY WITH THE REVIEWER 2 REQUEST

 

Reductions in average length should only account for individuals whose sex has been identified. Analyses and evaluations should be based solely on these results. Data from immature and unidentified individuals should be excluded from the calculations, and this information should be detailed in the materials and methods section.

THE comparison of the mean total lengths of sexed individuals reveals a highly significant difference between the periods 2002–2003 and 2022–2023 (p < 0.0001). The same applies to the mean weights, which also differ significantly between the two periods for sexed individuals of Sarotherodon melanotheron (p < 0.0001).

 

The data for individuals in the smallest length class range (2-4 cm) and the largest length class range (>26 cm for the 2002-2003 samplings and >18 cm for the 2022-2023 samplings) presented in Table 1 are not visible in Figures 8a and 8b.

THESE values do not appear in Figures 8a and 8b because, although they were recorded during the sampling campaigns, they are used by the FAO's FiSAT II software as lower and upper boundary classes in its calculation routine to estimate the length at first capture of the species in the fishery. They are therefore included in the dataset for analytical PURPOSES.

 

Several errors in Figure 9 need to be addressed. First, the graphs do not display the distribution of measurement values that the curves represent; only the curves themselves are visible. The values for mature individuals should be indicated as points for females, while a different shape or colour should be used for males. Additionally, Figure a lacks values on the X-axis, and the line that should intersect the X-axis for females does not start at the correct intersection point on the Y-axis. In Figure b, the line that is supposed to intersect the Y-axis at 50% intersects at approximately 58% for females, and there is no corresponding line for males. Furthermore, the labels for females and males in Figure b appear to be written in French. Overall, this figure needs to be redrawn :

REPLACED ACCORDINGLY IN THE PAPER

WE WOULD also like to point out that the stock assessment of Sarotherodon melanotheron in Lake Toho was conducted using the FiSAT II software (FAO-ICLARM Stock Assessment Tools). This software is based on the analysis of length-frequency data (LFQ), which requires the monthly total lengths of individuals from the studied species. FiSAT II uses a routine that incorporates parameters such as water temperature 28.80 °C for the 2002–2003 period and 28.82 °C for 2022–2023.

Based on these inputs, the software automatically generates estimates of total mortality (Z), natural mortality (M), and fishing mortality (F), with some manual input required. It plots curves, positions axes, and displays results in a standardized format, as presented in our study. The entire procedure follows the guidelines provided in the FiSAT II user manual and aligns with practices recognized in the scientific literature, including recent publications in journals such as MDPI.

Interpreting the results generated by this tool is a critical step in evaluating stock status and informing fishery managers. It is also important to note that FiSAT II does not allow for separate analyses by sex (male/female) of individuals, which would distort the estimates. Therefore, both sexes are combined in the analyses, in accordance with the software’s limitations.

Attached is the link to the official English version of the FiSAT II manual for more technical and methodological details : (https://www.fao.org/fishery/docs/DOCUMENT/FisatII/FISATII_book_English.pdf ).

 

The materials and methods section does not include the chi-square test mentioned in line 334. Authors should add it to the relevant section :

INCLUDED IN THE TEXT

The materials and methods section does not include the chi-square test mentioned in line 334. Authors should add it to the relevant section ADDED IN THE TEXT.

The Chi-square test was used to compare the distributions of sexual maturity stages of S. melanotheron between two distinct periods (2002-2003 and 2022-2023).

 

The total number of individuals listed in Table 2 does not match the sum of the identifiable female and male individuals reported in Table 1. For the 2022-2023 samples in Table 1, the total is 6716, while Table 2 states it as 6710. Similarly, for the 2002-2003 samples, the total in Table 1 is 1623, but Table 2 indicates it as 1604: 

CHANGED ACORDINGLY

 

Growth parameters should be presented in a table format for females, males, and the total for both sampling periods (as shown in Table 5) instead of as figures. Consequently, Figure 7 should be removed.

DONE IN THE PAPER TEXT

 

 

 

 

 

 

 

 

 

 

Reviewer 3 Report

Comments and Suggestions for Authors

Overfishing Impact on Sarotherodon melanotheron Rüppel,  1858 fish species populations resilience temporal dynamic in 3 the West African Toho Lake- fishes-3684904-by Hountcheme et al.

The study deals with the impact of overfishing on the fish population dynamic in tropical lentic ecosystem. It uses data from local fishermen catching fish using various gears including small dip nets, large dip nets , gillnets, fish traps, and single hooks. The manuscript is interesting because it links high fishing pressure to the problem of conserving biodiversity and their habitat. The study presents an interesting approach but requires improvements described below before any consideration.

In title “Overfishing Impact on Sarotherodon melanotheron Rüppel,  1858 fish species populations resilience temporal dynamic in 3 the West African Toho Lake”, I suggest: “Impact of Overfishing on the Resilience and Temporal Dynamics of Fish Species Sarotherodon melanotheron (Rüppel, 1858) in Lake Toho, West Africa”. Please consult the MDPI guid for authors.

L35 in keyword list, I suggest remove “Benin”.

L46 [1,2,3,4,5] =  [1-5] Here and elsewhere throughout the text, please read the MDPI guid for author citation.

L108-112 Please improve this paragraph by clearly stating the purpose of the study and its specific objectives.

L130 “Fig. 1-3” = “fig. “ map and picture of Toho lake.”

L133-165 Figs 4-6, please use the same size in the pictures.

L164 and 170 “(Figures 5 and 3)”, these figs are related to maturity stages of fish.

L130-417 Please improve the quality and resolution of all figures 1-11.

L280-289 The results section should begin by presenting the catch balances by fishing gears involved in the models.

L315 what is meant by “on of total lengths”?

L321 Fig9a is incorrect, please check and improve.

L338 “fig. 6” is not found in the mean text.

L338 “p<0,0001” = “p<0.0001”

L338-512 Similarly, Tables 1-5 should be well presented in scientific article format.

L315 "Figure 8. Total length (cm) ..." and L381"Figure 8: Evolution of capture probability..."

L327 "Figure 9: Logistic curve for ..." and L391 "Figure 9: Catch curves of S. melanotheron ..."

L343 "Figure 5: Relative frequency ..." and L135 "Figure 5. Lake Toho fisherman fishing."

In Tables 3, 4 and 5 Please correct “,” to “.” For % and exploitation parameters.

L367 "Figure 7: Evolution of S. melanotheron ..." and L177 "Figure 7. Conceptual model ..."

This repetition is very confusing and needs to be resolved. Please number the figures correctly.

L400 Fig. 10 is not readable.

L513 In table 5 Please improve author citations according to MDPI guid.

In Table 1 L331 “Taotal” = “Total”; “p<0,0001 = p<0.0001”

L530-532 I suggest that the authors detail these management measures in more concrete terms to halt the decline and improve the lake's productivity. The study has precise biological and ecological data.

L589-773 Please follow the MDPI guide for referencing authors in the reference list.

 

 

 

 

Author Response

DEAR REVIEWER 3

THANK YOU FOR YOUR ENCOURAGING SUGGESTIONS

ALL YOURS AND THE OTHER TWO REVIEWERS SUGGESTIONS WERE SOLVED DIRECTLY IN THE PAPER TEXT. A LOT OF CHANGES, ADDINGS AND CORRECTIONS WERE DONE WE HOPE FOLLOWING THE REVIEWERS OPINIONS AND SUGGESTIONS.

ALL THE BEST

THE AUTHORS

 

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

General comments

The manuscript on the overfishing impact on Sarotherodon melanotheron in Lake Toho offers a valuable analysis, highlighting significant declines in population resilience over two decades. The study’s originality lies in its temporal comparison and detailed assessment of growth, recruitment, and reproductive overfishing, making it a critical contribution to West African fisheries management. However, to enhance its impact, please address several minor issues and errors.

 

Specific comments

Ln 352-358: should not be in Table 1 legend

Figure 3 legend is in French

ln 386: P value less than 0.001 should be referred to as p<0.001 (Table 2)

Table 4 is mentioned as Table n4 correct

Delete lines 425-426

Ln Change Figure 16 legend to Figure 6

Ln 445 change legend to Table 5

Ln Table 5 change to Table 6 and transfer table to results

Author Response

Dear Reviewer 1, please find below the requested minor changes:

 

Ln 352-358: should not be in Table 1 legend

IT WAS REMOVED BELOW IN THE PAPER TEXT

 

Figure 3 legend is in French

NOW IN ENGLISH

 

ln 386: P value less than 0.001 should be referred to as p<0.001 (Table 2)

DONE

 

Table 4 is mentioned as Table n4 correct

CORRECTED

 

Delete lines 425-426

DELETED

 

Ln Change Figure 16 legend to Figure 6

DONE

 

Ln 445 change legend to Table 5

DONE

 

Ln Table 5 change to Table 6 and transfer table to results

DONE

 

THANK YOU FOR YOUR PATIENCE!

 

 

 

 

 

 

 

Reviewer 2 Report

Comments and Suggestions for Authors

In my initial evaluation of the writer's work, I recommend removing the second paragraph from the introduction. Alternatively, it could be integrated into the relevant materials and methods sections. Currently, the authors have placed this paragraph in an inappropriate location that does not align with the meaning and content of the first paragraph under the "Sample Area" subheading. It would be best to eliminate this paragraph from the article entirely. It is important to note that if the articles cited in the removed paragraph are not referenced elsewhere in the text, they should also be excluded. Thus, the articles mentioned in the body and reference sections must be renumbered accordingly.

 

Figures 2 to 7 have been removed as suggested; however, most references to these figures remain in the text. Please delete the following citations: page 4, line 152 (Figure 6); line 153 (Figure 4); page 5, lines 161 and 173 (Figure 5); and line 179 (Figure 3).

 

In the first row of Table 1, the third column should be updated to change "mini" to "min." and "maxi." to "max." Additionally, in the fourth column, "Longueurs moyennes" should be replaced with "Average length," and in the sixth column, "Poids moyens" should be changed to "Average weight."

 

On page 8, line 349, Figure 8 should be corrected to Figure 3, not as Figure 9.

 

In the heading of Table 1, the sentence should conclude with 2022-2023 (page 9, line 352). The subsequent sentences beginning with "the average total length" should be removed (lines 352-358).

 

All graphs in Figure 2 must have the same scale for the X and Y axes. The X axis should range from 0 to 30 cm, while the Y axis should range from 0 to 80 (%). Additionally, the length distributions in these graphs do not fully align with the data presented in Table 1. I suggest the authors verify the length frequency data utilised when creating the graphs.

 

The title of Figure 3 was in French and needs to be replaced with the English version.

In Figures 4a and 4b, the lines intersecting the Y axis at 50% and the X axis are misaligned and need correction.

 

On page 13, line 415, Table n should be corrected as Table 4. Authors must delete the Figure text on this line.

 

Authors must delete lines 425 and 426.

 

Figure 16 should be corrected to Figure 6 in line 433

 

Table 4 in lines 443 and 445 must be changed to Table 5

 

Figure 10 in line 457 should be corrected to Figure 8

 

Figure 10 in line 459 should be corrected to Figure 9

 

Table 5 in lines 533 and 623 must be changed to Table 6

 

Author Response

In my initial evaluation of the writer's work, I recommend removing the second paragraph from the introduction. Alternatively, it could be integrated into the relevant materials and methods sections. Currently, the authors have placed this paragraph in an inappropriate location that does not align with the meaning and content of the first paragraph under the "Sample Area" subheading. It would be best to eliminate this paragraph from the article entirely. It is important to note that if the articles cited in the removed paragraph are not referenced elsewhere in the text, they should also be excluded. Thus, the articles mentioned in the body and reference sections must be renumbered accordingly.

THE SUGGESTED PARAGRAPH BY REVIEWER 2 WAS ELIMINATE ENTIRELY FROM THE ARTICLE, THE ARTICLES/REFERENCES CITED THERE ARE PRESENT ELSWHERE IN THE PAPER SO WAS NOT NEED TO BE ELIMINATED FROM THE PAPER FINAL REFERENCES LIST. 

 

Figures 2 to 7 have been removed as suggested; however, most references to these figures remain in the text. Please delete the following citations: page 4, line 152 (Figure 6); line 153 (Figure 4); page 5, lines 161 and 173 (Figure 5); and line 179 (Figure 3).

ALL THE SUGGESTED CITATIONS/FIGURES WERE DELETED FROM THE PAPER TEXT. THANK YOU.

 

In the first row of Table 1, the third column should be updated to change "mini" to "min." and "maxi." to "max." Additionally, in the fourth column, "Longueurs moyennes" should be replaced with "Average length," and in the sixth column, "Poids moyens" should be changed to "Average weight."

DONE AS SUGGESTED. THANK YOU.

 

On page 8, line 349, Figure 8 should be corrected to Figure 3, not as Figure 9.

DONE

 

In the heading of Table 1, the sentence should conclude with 2022-2023 (page 9, line 352). The subsequent sentences beginning with "the average total length" should be removed (lines 352-358).

IT WAS REMOVED UNDER THE TABLE 1.

 

All graphs in Figure 2 must have the same scale for the X and Y axes. The X axis should range from 0 to 30 cm, while the Y axis should range from 0 to 80 (%). Additionally, the length distributions in these graphs do not fully align with the data presented in Table 1. I suggest the authors verify the length frequency data utilised when creating the graphs.

DONE

 

The title of Figure 3 was in French and needs to be replaced with the English version.

IT WAS REPLACED

 

In Figures 4a and 4b, the lines intersecting the Y axis at 50% and the X axis are misaligned and need correction.

DONE

 

On page 13, line 415, Table n should be corrected as Table 4. Authors must delete the Figure text on this line.

IN GENERAL YOU LINES NUMBERING IS DIFFERENT BY OUR DOCUMENT .... IS IS HARD TO FIND THINGS .... IN THIS CASE I CAN NOT FIND A TABLE N IN THE TEXT. I AM SORRY.

 

Authors must delete lines 425 and 426.

IN MY DOCUMENT THESE LINES ARE:

Figure 7. Catch curves of S. melanotheron caught in 2002–2003 (a) and 2022–2023 (b).

Table 5. Exploitation parameters and biological indicators of S. melanotheron individuals from Lake Toho in 2002–2003 and 2022–2023.

I CAN NOT DELETE THEM

 

Figure 16 should be corrected to Figure 6 in line 433

DONE

 

Table 4 in lines 443 and 445 must be changed to Table 5

WE HOPE WE DO IT RIGHT, DUE TO THE DIFFERENCE IN LINE NUMBERING OF OUR DOCUMENTS ....

 

Figure 10 in line 459 should be corrected to Figure 9

UFFFF I DON T HAVE A FIG 10 IN OUR TEXT ...

 

MAY BE IF WE WILL CLEAN ALL THE SUGGESTED CHANGES/TRACK CHANGED OF ALL THE REVIEWERS IN THE TEXT WE CAN HAVE A FINAL CLEAR VIEW ABOUT THE MANUSCRIPT, NOW DUE TO TRACK CHANGES ALL OVER THE TEXT IS SOMETIMES CONFUSING .....

WE ARE APPOLOGYZING FOR THE DELAY. ONE OF THE CO-AUTHORS AFTER THE LAST FIELD WORK CONTRACTED MALARIA AND IS UNDER MEDICAL CARE NOW NOT BEING IN FULL CONTACT ALL THE TIME WITH THE CO-AUTHORS ...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reviewer 3 Report

Comments and Suggestions for Authors

Overfishing Impact on Sarotherodon melanotheron Rüppel,  1858 fish species populations resilience temporal dynamic in 3 the West African Toho Lake- fishes-3684904-V2-by Hountcheme et al.

I am partially satisfied with the corrections made. I suggest a few more below:

Please standardize the X axis between figure 11 a and b.

L415 "... over time (Table n …..igure 7)." This's confusing. Please correct.

In Figs 16,7 and 8 and Tables 3, 4 and 5, “,” = “.”. Please use “.”

In Table 5 Please cite references for example "Lederoun et al. 2015 [29]" as "Lederoun et al. [29]" according to MDPI guild.

Please number figures and tables correctly.

Author Response

I am partially satisfied with the corrections made. I suggest a few more below

THANK YOU!

 

Please standardize the X axis between figure 11 a and b.

DONE IN THE PAPER

 

L415 "... over time (Table n …..igure 7)." This's confusing. Please correct.

DONE

 

In Figs 16,7 and 8 and Tables 3, 4 and 5, “,” = “.”. Please use “.”

DONE

 

In Table 5 Please cite references for example "Lederoun et al. 2015 [29]" as "Lederoun et al. [29]" according to MDPI guild.

DONE IN ALL THE TABLE

 

Please number figures and tables correctly.

DONE