Open AccessEffects of different temperatures on the growth and survival of mud crab (Scylla paramamosain) larvae
Author(s) -
Thanh Phương Nguyễn,
Tinh Em Nguyen,
Thi Kim Ha Nguyen,
Quốc Việt Lê,
Thi Thanh Huong
Publication year - 2021
Publication title -
can tho university journal of science
Language(s) - English
Resource type - Journals
eISSN - 2815-5602
pISSN - 2615-9422
DOI - 10.22144/ctu.jen.2021.035
Subject(s) - scylla paramamosain , carapace , biology , larva , zoology , scylla serrata , stocking , moulting , fishery , ecology , crustacean , biochemistry , gene
This study aimed to evaluate the effects of temperature on the growth and survival of mud crab (Scylla paramamosain) larvae in two stages including zoea-1 to megalopa (the first experiment) and megalopa to crablet-1 (the second experiment). Each experiment was conducted in a completely randomized design with four temperature levels (27, 30, 33, and 36℃) in triplicate. Stocking density of 200 ind./L for the first experiment and 4 ind./L for the second experiment. Fiberglass tanks of 500-L (containing 300-L and 250-L of 25‰ water for the first and second experiment, respectively) were used in the experiments. The results showed that S. paramamosain larvae at zoea-3 and zoea-4 died at 33℃ or above, while the highest survival rate of this stage was found at 27℃ (11.5%). The growth and larval stage index during the zoea to megalopa stage were significantly higher in 30℃ (p<0.05) compared to those in the 27℃ treatment. In the second experiment, the survival rates of crablet-1 were highest (72.9%) at 27℃ and lowest (34,7%) at 36℃. The growth rate of crablets at this stage increased with increased temperature. The highest carapace width and weight (3.41 mm and 0.030 g, respectively) were recorded at 36℃. The findings of this study suggested that mud crab larvae should be reared at the temperature range of 27-30℃ to maximize their production.