Comparison of high temperature tolerance of turbot Scophthalmus maximus F2 families and broodstock

Abstract:

To test the high-temperature tolerance of turbot, young fish of different turbot F2 families was studied through heat shock and being cultured in high temperature seawater. Experiment A: 50-day post hatching(dph) young fish from F2 families (year 2010) was heat-shocked acutely in 30℃ seawater for 2 hours, then transfered into normal saewater and the survival rate was recorded for the next 48h. Experiment B: 100dph youngfish from F2 families (year 2009 and 2010) was reared in high temperature seawater with the water temperature being raised continuously at 2℃/day.The survival rates of young fish in each family were recorded every 12h. Twenty F2 families and 11 broodstocks were selected by the survival rate phenotype post heat shock and high temperature culture. The 20 F2 families and 11 broodstocks of turbot with high-temperature tolerance are expected to become part of the core population for breeding.