低盐碱养殖水体中放养密度和规格对斑点叉尾鮰生长性能和经济效益的影响

Growth Performance and Economic Benefits of Ictalurus Punctatus with Different Stocking Density and Sizes in Low Saline-alkaline Ponds

探讨了在低盐碱(盐度1.7,pH值约为7.72)水体养殖条件下,养殖密度(15000、16500、18000尾/hm^(2))和放养规格(0.3、0.5 kg)对斑点叉尾鮰生长性能和养殖经济效益的影响。结果表明,随养殖密度的增加,斑点叉尾鮰的饵料系数增大,产量表现为先升高后降低,收获规格和成活率则呈现下降趋势。其中,放养密度为16500尾/hm^(2)时,池塘评价产量最高,达18156.21 kg/hm^(2);平均毛利润也最高,达89813.10元/hm^(2)。随着放养规格的增大,养殖产量、收获规格、成活率和饵料系数均呈现增大的趋势。其中,大规格鱼种平均产量和平均毛利润分别达20272.80 kg/hm^(2)和90531.82元/hm^(2)。在低盐碱(盐度1.7,pH值约为7.72)水体中斑点叉尾鮰放养密度和放养规格分别为16500尾/hm^(2)和0.5 kg/尾时,具有最大的生长性能和经济效益。

The growth performance and economic benefits of Ictalurus punctatus with different stocking densities(15000,16500 and 18000 ind./hm^(2))and sizes(0.30 and 0.50 kg/ind.)were compared by in four low saline-alkaline ponds.The results showed that with the increase of the breeding density,the feed coefficient of the Ictalurus punctatus increased,the yield of each pond first increased and then decreased,and the harvest size and survival rate showed a downward trend.compared to the other density,the pond with the density of 16500 ind./hm^(2) had the highest yield(18156.21 kg/hm^(2))and gross profit(89813.10 yuan/hm^(2));With the increase of stocking size,the yield,survival rate and feed coefficient increased;the average yield and average gross profit of large-size fish(0.50 kg/ind.)were 20272.80 kg/hm^(2) and 90531.82 yuan/hm^(2),respectively.The above results indicated that the best economic benefit could be obtained with suitable density(16500 ind./hm^(2))and size(0.5 kg/tail).