白莲河水库网箱培育鲢鱼种放养密度的研究

STUDIES ON STOCKING DENSITY IN CAGE CULTURE OF SILVER CARP FINGERLINGS IN THE BAILIANHE RESERVOIR

本文报道了湖北省黄冈地区白莲河水库,利用天然浮游生物为饵料,在网箱中培育鲢鱼种放养密度的研究结果。试验用网箱共14只,按每立方米水体中平均放养243.3、364.9、484.3、605.9、727.6、970.8和1211,9尾七种不同的密度进行试验。结果表明,在所试养的密度范围内,密度与成活率之间呈弱的负相关关系(r=-0.2054);密度与每只网箱的总产量之间呈正相关关系(r=0.9023),而与出箱个体重量之间呈负相关关系(r=-0.7639)。作者据此对成活率、规格频率分配、个体增长及群体产量进行综合分析,认为在白莲河水库中,网箱培育鲢鱼种的最佳密度为454尾/米~3。

Experiments for rearing silver carp fingerlings in cages by feeding on naturalfood, have been carried out successively for three years in the Bailianhe Reservoir.The present paper is based upon the work from June 18 to August 28 in 1978. Thefingerlings were raised in rectangle cages of 7×3.5×2 M with the volume of40.38 M^3. Fingerlings of 3.95 cm in average length were stocked in 14 cages with dif-ferent densities of 243-1,211 ind./M^3 in number. At the end of the experment a totalamount of 243,759 fingerlings were harvested, the fish grew about 12.23-16.95 cmin length and the average ptoduction was 277 ind./m^3. The object of the experiment was to study the effects of stocking densities ongrowth, survival and production in order to determine the optimum cage-rearingdensity for silver carp fingerling in the Bailianhe Reservoir.