クロソイ幼魚の温度反応 Temperature Responses of Young Schlegel's Black Rockfish Sebastes schlegeli
Studies were conducted to clarify the temperature preference and tolerance, and the effects of temperature on the growth of young Schlegel's black rockfish <i>Sebastes schlegeli</i>. A horizontal temperature gradient tank was used for the temperature preference test. The preferred temperature of the fish acclimated to 15-28°C ranged 17.8-22.8°C, with no clear dependence on the acclimation temperature. The final preferendum was estimated to be about 20.5°C. The upper and lower lethal temperatures of the fish exposed for 72h to eight or nine constant test temperatures ranged 28.1-30.5°C and 2.0-9.5°C, respectively. The critical thermal maximum and minimum ranged respectively 31.2-34.6°C and 1.3-4.9°C. The ultimate upper lethal temperature, which could not be exceeded with elevating acclimation temperature, was 30.8°C. In a rearing experiment, where the fish were fed <i>Euphausia pacifica</i> to satiation for 21 days at seven constant temperatures between 12 and 30°C, the highest daily feeding rate, daily growth rate and food conversion efficiency of the fish were found at 25°C, 22°C and 20°C, respectively.<br>The final preferendum was thus found close to the temperatures for the highest growth rate and food conversion efficiency.
日本水産学会誌 63(3), 317-325, 1997-05-15