Ontogenetic changes of acute thermal tolerance of post-hatch Japanese sea bass, Lateolabrax japonicus
2009
Kikkawa, T.(Marine Ecology Research Inst., Onjuku, Chiba (Japan)) | Kaku, M. | Setoguma, T. | Kinoshita, H.
Ontogenetic changes of acute thermal tolerance were investigated in embryonic, larval and juvenile Japanese sea bass, Lateolabrax japonicus. Samples of 6-14 fish cultured at 16degC were exposed for 15 min to elevated water temperature between 20 and 38degC at ages of 0, 1, 2, 3, 5, 7, 10, 13, 16, 21, 24, 31, 38, 45 and 52 days post-hatch. Median lethal temperatures (TL50) were calculated from the mortalities at 24 h after the thermal exposure. The most susceptible developmental stage was flexion larvae and TL50 was 27.0degC, whereas the most tolerant stage was yolk-sac larvae before the mouth opening (35.0degC).
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