条纹锯对高温胁迫及胁迫后恢复方式适应的初步研究

The adaptability of black sea bass (Centropristis striata) to semi-lethal temperature and recovery mode from exposure to semi-lethal temperature

研究了质量为148.88 g±17.29 g和16.32 g±2.23g两种规格的条纹锯(Centropristis striata)鱼种对高温的耐受性及高温胁迫后恢复方式的适应。结果表明:大规格鱼种的高温半致死温度为26.80℃,最适温度上限为20.38℃。小规格鱼种的高温半致死温度为29.26℃,最适温度上限为25.11℃。依据实验鱼种耗氧率的恢复情况可以断定:在暴露于高温半致死温度48 h或72 h条件下,直接恢复方式略优于梯度恢复方式;而暴露24 h条件下,两种恢复方式的作用无明显差异。高温半致死温度暴露下,要避免条纹锯达到半数死亡则积温不能超过(1 064.67±72.01)℃h。

In this paper, two kinds of Centropristis striata （148.88 g±17.29 g and 16.32 g±2.23 g） were used to investigate the adaptability of black sea bass to semi-lethal temperature and the recovery mode from exposure to semi-lethal temperature. By the interpolation method, we got that the larger-sized fingerling＇s semi-lethal temperature and the upper limit of optimum temperature were 26.80 ℃ and 20.38 ℃, respectively. And the smaller-sized fingerling＇s semi-lethal temperature and the upper limit of optimum temperature were 29.26 ℃ and 25.11 ℃, respectively. By measuring the oxygen consumption rate （OCR）, we found the direct mode was more propitious for fingerling＇s recovery than gradient mode after continuous exposure to semi-lethal temperature for 48 h or 72 h. But both of the modes could make them recover successfully after being exposed for 24 h. In addition, the semi-lethal accumulated temperature should be less than 1064.67 ℃·h±72.01℃·h at semi-lethal temperature in order to exempt semi-lethal rate.