摄食水平和性别对稀有鮈鲫生长和能量收支的影响

EFFECT OF RATION LEVEL ON GROWTH AND ENERGY BUDGET OF MALE AND FEMALE RARE MINNOW GOBIOCYPRIS RARUS

于 1 995年 1 0月采集本所自繁的稀有鮈鲫 (约 1 .0 3g/ind) ,在 30℃水温下进行摄食 -生长实验 ,研究了从饥饿到饱食 5个摄食水平对不同性别稀有鮈鲫的生长和能量收支的影响。结果表明 ,鱼体干物质和能量含量不受摄食率和性别的影响。随着摄食率的增加 ,雌鱼的湿重、干重和能量特定生长率均呈双对数增加 ,雄鱼湿重特定生长率呈双对数增加 ,而干物质和能量特定生长率呈指数增加。雄鱼生长速度及摄食率低于雌鱼。随着摄食率的增加 ,食物能损失于粪便中的比例均呈上升趋势 ,损失于排泄物中的比例变化不大 ,呈下降趋势 ;用于代谢的比例呈下降趋势 ;用于生长的比例呈上升趋势。除饥饿组外 ,在各个摄食水平 ,雌鱼食物能用于代谢的比例较雄鱼低 ,而用于生长的比例较雄鱼高。

A diet containing 37.8% crude protein was fed to rare minnow at 5 ration levels (0%, 1%, 2%, 3%, and Satiation) to investigate the effect of ration on the growth and energy budget of male and female rare minnow at 30℃. Food energy, faecal energy, excretory energy and growth energy were determined directly and metabolism energy was calculated by difference. The contents of dry matter and energy of fish were independent of ration and sex. Specific growth rate was significantly affected by ration and sex and increased bi logarithmically with ration for the female, while the specific growth rate for the male in wet weight increased bi logarithmically and those in dry weight and energy increased exponentially with ration. The female grows more rapidly than the male. With an increase in ration, the proportion of food energy lost in faeces increased while that lost in nitrogenous excretion was changed only slightly. The proportion of food energy channeled into metabolism decreased while that deposited in growth increased. Except for starvation, at each ration level, the proportion of food energy channeled into metabolism was higher for the male than that for the female, while the proportion recovered in growth was higher for the female than that for the male.