Abstract
Effect of temperature and food concentration on the growth of bottom cultured Japanese scallop Mizuhopecten yessoensis, was investigated in the coastal area of northeastern part of Hokkaido, Japan. Fourteen years from 1992 to 2005 were distinguished into good growth years and bad growth years by yield rates of adductor muscle. Although water temperature was not different between good and bad growth years significantly, chlorophyll a concentrations in spring were significantly higher in good growth years than in bad growth years. The predictive model for bad growth years was constructed by spring temperature and chlorophyll a data. The appropriate logistic regression model was selected by AIC method, so that the model using spring chlorophyll a data was adapted. These results suggest that low food concentration in spring causes bad growth to bottom cultured Japanese scallop.
