池塘循环水槽一年两造养殖吉富罗非鱼的经济和生态效益分析

Economic and ecological benefits of annually two-cycle farming method of GIFT tilapia with in-pond raceway system

  • 摘要: 为实现池塘循环水槽养殖模式的高效利用,降低养殖风险,文章开展了吉富罗非鱼(GIFT, Oreochromis niloticus)一年两造池塘循环水槽养殖研究。第一造吉富罗非鱼放养密度分别为183尾·m−2和274尾·m−2,规格为(36.6±2.8) g,养殖期为122 d;第二造吉富罗非鱼放养密度分别为154尾·m−2和215尾·m−2,放养规格为(185.2±15.8) g,养殖期为100 d;外池塘套养罗氏沼虾(Macrobrachium rosenbergii)、鲢(Hypophthalmichthys molitrix)和鳙(Aristichthys nobilis)。对养殖过程中的水质、养殖结果和效益进行评价分析。结果显示,第一造吉富罗非鱼成活率为83.38%,饵料系数1.12,养殖产量24 107 kg;第二造吉富罗非鱼成活率为93.35%,饵料系数1.17,养殖产量25 730 kg;外池塘罗氏沼虾2 012 kg,鲢1 789 kg,鳙801 kg;每公顷投入452 566元,收入655 099元,利润202 533元,投资回报率44.75%。研究表明,利用池塘循环水槽养殖模式开展吉富罗非鱼一年两造养殖,降低了链球菌发病率,提高了养殖效益,实现了养殖模式的高效利用。

     

    Abstract: To achieve an efficient utilization of pond aquaculture system and reduce the risk of cultivation, we investigated the annually two-cycle farming method of GIFT tilapia  (Oreochromis niloticus) with in-pond raceway system. In the first breeding production, we kept the fish (36.6±2.8) g in two raceway for 122 d with the densities of 183 ind·m−2 and 274 ind·m−2, respectively. In the second breeding production,we kept the fish (185.2±15.8) g in two raceway for 100 d with the densities of 154 ind·m−2 and 215 ind·m−2, respectively. Meanwhile, Macrobrachium rosenbergii, Hypophthalmichthys molitrix and Aristichthys nobilis were cultured around the pond. Then we evaluated the water quality, aquaculture results and breeding benefits in the aquaculture process. The results show that the survival rate of GIFT tilapia was 83.38%; the feed coefficient was 1.12; the aquaculture yield was 24 107 kg in the first breeding production. While in the second breeding production, the survival rate was 93.35%; the feed coefficient was 1.17; and the aquaculture yield was 25 730 kg. The yields of M. rosenbergii, H. molitrix and A. nobilis were 2 012 kg, 1 789 kg and 801 kg, respectively. For the breeding benefits, the average investment and income were 452 566 Yuan per square hectare and 655 099 Yuan per square hectare, respectively, with a profit of 202 533 Yuan per square hectare and a return rate of investment of 44.75%. It is indicated that the annually two-cycle farming method with in-pond raceway system is effective for GIFT tilapia breeding, which can reduce the incidence of Streptococcus and improve the breeding efficient utilization.

     

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