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Article

Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures

1
Research Institute for Brackishwater Aquaculture and Fisheries Extension, Maros 90512, Indonesia
2
Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Nerus 21030, Malaysia
3
Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Kuala Nerus 21030, Malaysia
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Crustacean Aquaculture Research Division, Fisheries Research Institute, Pulau Sayak, Kota Kuala Muda 08500, Kedah, Malaysia
5
STU-UMT Joint Shellfish Research Laboratory, Shantou University, Shantou 515063, China
6
Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou 515063, China
*
Author to whom correspondence should be addressed.
Academic Editor: Cosmas Nathanailides
Animals 2021, 11(4), 1146; https://doi.org/10.3390/ani11041146
Received: 10 February 2021 / Revised: 1 March 2021 / Accepted: 1 March 2021 / Published: 16 April 2021
(This article belongs to the Special Issue Emerging Issues in Aquaculture)
The nursery phase of mud crab (Scylla spp.)—from megalopa to several, further crablet stagesneeds to be carried out in optimal environmental conditions, until they reach a larger size suitable to being stocked to a pond. This study observed the behavioral thermoregulation of crablet instar phases, and determined the effects of several levels of water temperature on growth, survival, molting cycle, gill condition, and sex ratio in the nursery phase of S. paramamosain. In this study, optimal temperature for the long-term nursery phase of S. paramamosain, beginning with megalopa stage, was found to be 28 to 30 °C, with the possibility that water temperature could affect the sex ratio of mud crabs. Findings of this study could result in increased crablet production from hatcheries, and assist in realizing potential of monosex seed production of S. paramamosain, through temperature treatment.
This study was carried out to determine the physiological changes (survival, growth, molting cycle, sex differentiation, and gill condition) of mud crab, Scylla paramamosain crablet at different water temperatures of 24, 28 and 32 °C, and ambient temperature of 27 to 30 °C. Thermoregulatory behavior, represented by preferred temperature (29.83 ± SD 2.47 °C), critical thermal minimum (17.33 ± SD 0.58 °C), critical thermal maximum (40 ± SD 0.00 °C), and thermal tolerance interval (22.67 ± SD 0.58 °C), were checked for Crablet 1 stage only (with ambient temperature as acclimation temperature).Both low (24 °C) and high (32 °C) temperatures were associated with lower growth performance, and survival rate (p < 0.05), in comparison with both 28 °C and ambient temperature treatments.Male ratio at low temperaturetreatment (24 °C) was higher (80.09 ± SD 18.86%) than for other treatments (p < 0.05), observed as 44.81 ± D 10.50%, 41.94 ± SD 19.44%, and 76.30 ± SD 5.13% for 28 °C, 32 °C and ambient temperature treatments, respectively. However, there was no significant difference observed between 24 °C, 28 °C, and ambient temperature treatments. Anatomical alterations of gill lamellae of S. paramamosain crablet for both 32 °C, and 24 °C treatments, appeared thinner and paler than at both 28 °C, and ambient temperature treatments. Based on this study, temperature of 28 to 30 °C was recommended as the optimal temperature for the long-term nursery phase of S. paramamosain. View Full-Text
Keywords: aquaculture; environmental conditions; seed production; mud crab; Scylla paramamosain; nursery; megalopa; crablet aquaculture; environmental conditions; seed production; mud crab; Scylla paramamosain; nursery; megalopa; crablet
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MDPI and ACS Style

Syafaat, M.N.; Azra, M.N.; Mohamad, F.; Che-Ismail, C.Z.; Amin-Safwan, A.; Asmat-Ullah, M.; Syahnon, M.; Ghazali, A.; Abol-Munafi, A.B.; Ma, H.; Ikhwanuddin, M. Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures. Animals 2021, 11, 1146. https://doi.org/10.3390/ani11041146

AMA Style

Syafaat MN, Azra MN, Mohamad F, Che-Ismail CZ, Amin-Safwan A, Asmat-Ullah M, Syahnon M, Ghazali A, Abol-Munafi AB, Ma H, Ikhwanuddin M. Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures. Animals. 2021; 11(4):1146. https://doi.org/10.3390/ani11041146

Chicago/Turabian Style

Syafaat, Muhammad N., Mohamad N. Azra, Faridah Mohamad, Che Z. Che-Ismail, Adnan Amin-Safwan, Mohammad Asmat-Ullah, Mohammad Syahnon, Azmie Ghazali, Ambok B. Abol-Munafi, Hongyu Ma, and Mhd Ikhwanuddin. 2021. "Thermal Tolerance and Physiological Changes in Mud Crab, Scylla paramamosain Crablet at Different Water Temperatures" Animals 11, no. 4: 1146. https://doi.org/10.3390/ani11041146

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