【摘要】 在不同水温[(5.5±0.5)℃、(8.5±0.5)℃、(11.5±0.5)℃、(14.5±0.5)℃、(17.5±0.5)℃]条件下,分别测定了饱食和空腹状态下溪红点鲑幼鱼的耗氧率和排氨率,分析了温度和摄食对溪红点鲑幼鱼呼吸代谢的影响.结果表明:饱食后,5个温度梯度组溪红点鲑幼鱼的耗氧率和排氨率均迅速上升,达最大值后缓慢下降,并逐渐恢复到初始水平;饱食状态下,溪红点鲑幼鱼耗氧率(OR)和排氨率(NR)与温度(t)的回归方程分别为OR=-0.0601t4+2.5542t3-39.256t2+276.26t-598.75(n=650,R2=1,4.5℃<t<17.5℃)和NR=-0.0020t4+0.0826t3-1.2318t2+8.6186t-18.838(n=650,R2=1,4.5℃<t<17.5℃);空腹状态下,溪红点鲑幼鱼耗氧率和排氨率与温度的回归方程分别为OR=13.723t0.9738(n=650,R2=0.9974,4.5℃<t<17.5℃)和NR=0.1687t1.0896(n=650,R2=0.9977,4.5℃<t<17.5℃).11.5℃~14.5℃为溪红点鲑幼鱼代谢最活跃的温度范围;溪红点鲑幼鱼在饥饿状态下的供能物质以脂肪和碳水化合物为主.更多还原

【Abstract】 The oxygen consumption and ammonia excretion rates of juvenile brook trout(Salvelinus fontinalus) under satiation and starvation were measured at different levels of water temperature [(5.5±0.5),(8.5±0.5),(11.5±0.5),(14.5±0.5),(17.5±0.5) ℃],aimed to study the effects of water temperature and feeding on the respiratory metabolism of the fish.Under satiation,the oxygen consumption and ammonia excretion rates of juvenile S.fontinalus at the five temperature levels increased rapidly to the maximum,and then decreased gradually to the initial state.The regression equations of oxygen consumption rate(OR) and ammonia excretion rate(NR) to water temperature(t) were OR=-0.0601t4+2.5542t3-39.256t2+276.26t-598.75(R2=1,4.5 ℃<t<17.5 ℃) and NR=-0.0020t4+0.0826t3-1.2318t2+8.6186t-18.838(R2=1,4.5 ℃<t<17.5 ℃),respectively.Under starvation,the regression equations were OR=13.723t0.9738(R2=0.9974,4.5 ℃<t<17.5 ℃) and NR=0.1687t1.0896(R2=0.9977,4.5 ℃<t<17.5 ℃),respectively.The optimal temperature range was 11.5 ℃-14.5 ℃.The juvenile S.fontinalus in starvation was heavily depended on fat and carbohydrates.更多还原