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采用室内实验生态学方法研究了不同栖息水温和不同溶解氧水平下处于标准代谢状态的西施舌耗氧率与排氨率,并测定了窒息点.结果表明,在25℃时,水中DO≥3.11±0.15mg.L-1时,西施舌的耗氧率和排氨率分别为0.74±0.05mg.g-1.h-1和2.56±0.05μmol.g-1.h-1,处于相对稳定状态;当DO低于此值则代谢出现异常,耗氧率随DO下降而下降,直到窒息为止,其窒息点为1.22±0.06mg.L-1,而排氨率也呈直线下降,但排氨停止滞后于耗氧停止.耗氧率与栖息水温呈二次线型关系OCR=-0.0027T2+0.1367T-0.9557,R2=0.9724;水温为25.3℃时,西施舌的耗氧率达到最大,为0.77mg.g-1.h-1.处于适温状态(15℃和20℃)的O/N值要高于低温(10℃)和高温(25℃和30℃)时的O/N值,西施舌在适宜条件下更多地依赖于脂肪供能维持标准代谢,而在环境不适时则更多地调用机体的蛋白质来维持生理代谢需要.
The oxygen consumption rate and ammonia excretion rate of Xishi tongue under different habitat water temperatures and different dissolved oxygen levels were studied by means of indoor experimental ecology and the asphyxiation point was determined.The results showed that at 25 ℃, ± 0.15mg.L-1, the oxygen consumption rate and ammonia excretion rate were 0.74 ± 0.05mg.g-1.h-1 and 2.56 ± 0.05μmol.g-1.h-1, respectively, which were relatively stable When the DO was below this level, the metabolism was abnormal. The oxygen consumption rate decreased with the decrease of DO. The asphyxiation point was 1.22 ± 0.06 mg.L-1 and the rate of ammonia excretion decreased linearly until asphyxiation, Ammonia stopped lagging behind oxygen consumption.The oxygen consumption rate and habitat water temperature showed a quadratic linear relationship OCR = -0.0027T2 +0.1367T-0.9557, R2 = 0.9724; when the water temperature was 25.3 ℃, the oxygen consumption rate of Xishikiao reached the maximum, Was 0.77mg.g-1.h-1. O / N values at the proper temperature (15 ℃ and 20 ℃) were higher than those at low temperature (10 ℃) and high temperature (25 ℃ and 30 ℃) Value, Xishigaku relies more on fat supply to maintain standard metabolism under appropriate conditions, and more when the environment is not up to the body’s protein to maintain the physiological metabolism needs.