Effect of temperature on survival, intermolt period, and growth of juveniles of two mud crab species, Scylla paramamosain and Scylla serrata (Decapoda: Brachyura: Portunidae), under laboratory conditions

Temperature tolerance of juveniles of two mud crab species, <i>Scylla paramamosain</i> and <i>Scylla serrata</i> (Decapoda: Brachyura: Portunidae)

“…Thus, interspecific variation in the low-temperature adaptation by evaluating CLT and LTT values was equivalent in two mud crab species: juveniles of S. paramamosain adapted to lower temperature conditions than those of S. serrata. Sanda et al (2022) also documented that the survival rate of S. paramamosain juveniles declined to 30-40% until C5 at 29.8°C, whereas all S. serrata juveniles survived to C5 even at 30.5°C, suggesting that juveniles of S. serrata adapt to higher temperature conditions than those of S. paramamosain. In our high-temperature tolerance experiments, CHT values for locomotor activity could not be estimated, as almost all surviving juveniles exhibited walking behaviour, whereas the estimated CHT values for survival were summarised as 39.0± 0.4°C in S. paramamosain and 39.1±0.6°C in S. serrata.…”

“…In the low-temperature tolerance experiment, the walking and survival rates of juveniles largely declined below -10°C in both species, and the estimated CLT values were summarised for locomotor activity as 8.4 ±0.7°C and 9.6±0.6°C and those for survival as 6.4±0.9°C and 7.4±0.4°C in S. paramamosain and S. serrata, respectively. Sanda et al (2022) reported that when C1 juveniles of S. paramamosain and S. serrata were reared at -15-30°C, S. paramamosain could moult to C2 at 15.4°C, whereas S. serrata could not moult to C2 at 15.2°C. Additionally, the lower threshold temperature (LTT) (95% confidence interval) for juvenile development was estimated as 13.7°C (13.5-13.8°C) for S. paramamosain and 15.4°C (15.1-15.7°C) for S. serrata.…”

“…Temperature tolerance experiments were conducted using laboratory-raised juvenile crabs in 2018-2021. Larvae were cultured to moult to C1 juveniles according to the method of Sanda et al (2022) at the Yaeyama Field Station, Japan Fisheries Research and Education Agency, Ishigaki, Okinawa Prefecture, Japan. Juvenile crabs were kept individually in plastic containers with lids (6.5 cm diameter and 7 cm height or 16 cm length, 10 cm width and 8 cm height), which were submerged in tanks with a flow-through water system of 300 L volume at natural temperature (mean± standard deviation, 25.2±2.7°C) and salinity (34-35 ppt) conditions.…”

“…We previously investigated the temperature adaptations of S. paramamosain and S. serrata by culturing C1 juveniles to moult to C2-C5 at different temperatures (-15-30°C) (Sanda et al, 2022). The C1 juveniles of S. paramamosain could moult to C2 at 15.4°C and the survival rate was reduced at 29.8°C through C4-C5, whereas the C1 juveniles of S. serrata could not moult to C2 at 15.2°C and the survival rate was not affected by temperature thereafter.…”

Cardiac Transcriptome and Histology of the Heart of the Male Chinese Mitten Crab (Eriocheir sinensis) under High-Temperature Stress

“…Furthermore, acute or chronic thermal stress can alter the stress axis functions and other stress responses [5]. Once the water temperature exceeds the normal range for crustaceans and fish, their growth, survival, and immunity are negatively affected [6][7][8][9].…”