鲢、鳙在天然条件下的摄食强度 (Ⅰ) 鲢、鳙鱼种在夏季的摄食强度
FEEDING INTENSITY OF SILVER CARP AND BIGHEAD UNDER NATURAL CONDITION(Ⅰ) FEEDING INTENSITY OF FINGERLINGS OF SILVER CARP AND BIGHEAD IN SUMMER
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摘要: 测定鲢(Hypophthalmichthy molitrix)、鳙(Aristichthys nobilis)鱼种在天然条件下肠管饱满度指数与水温及溶解氧的关系,在实验条件下鱼的排空率。根据修正后的Bajkov公式(D=C24·A/n)估计鱼的日摄食量。两种鱼在天然条件下具昼夜摄食节律,它们的摄食高峰在下午16—19时,低谷在清晨4—7时。鲢日粮为其体重12.81—23.08%;鳙为8.91—14.63%。它们的摄食强度随溶解氧的升高而加强,反之则下降。Abstract: There has been a common understanding that feeding intensity of fishes varies with time so as to form a definite diel feeding rhythm, but whether there is such a rhythm in silver carp and bighead under natural condition is still lack of information. In the experiments of subyearling cultivation in coves and bays, the authors colleted 313 silver carp (6.8—12.8cm in body length and 4.78—33.95g in weight) and 217 bighead (4.6—11.7cm in body length and 1.92—27.98 g in weight) for the purpose of studying their diel feeding intensity.The index of fullness of fish intestine in relation to water temperature and dissolved oxygen in the natural environment was determined; the evacuation rate of fishes under experimental condition was determined as well. According to a modified Bajkov’s formula(D=C·24A/N), the estimates of the diel ration of both fishes were obtained.Results show that both silver carp and bighead have a feeding rhythm when living in natural condition. Generally, maximum feeding intensity appears in 16—19 o’clock and the minimum in 4—7 o’clock. The daily ration for silver carp was found to be 12.81—23.08% of the body weight; for bighead, 8.91—14.63% of the body weight. Of both fishes, dissolved oxygen has a positive influence on feeding intensity.
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Keywords:
- Hypophthalmichthy molitrix
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