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Production of Genetically Improved Organic Nile Tilapia

机译：基因改良有机尼罗罗非鱼的生产

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摘要

Demand for organic products for human consumption has been on the increase due to the belief that organic products are safer and healthier to the consumer and the environment. In developing countries, Nile tilapia (Oreochromis niloticus) is usually grown in low-input organically fed ponds with little or no high protein supplementary feeding, an environment suitable for production of organic fish. However, Nile tilapia from such production systems do not attain large sizes which leads to low pond yields. This paper presents results of an attempt to improve the performance of organically farmed tilapia through selection for growth in organically fertilised earthen ponds. The selection environment consisted of earthen ponds fertilized daily with 50 kgdry matter (dm)/ha chicken manure. Body weight increased with selection and substantial response was recorded. Gut length increased with selection for body weight. Moreover, gut length and body weight were genetically highly correlated indicating that tilapia selected for growth on a herbivorous diet may develop longer guts as a mechanism for increasing capacity and efficiency for nutrient absorption. Taken together, these results demonstrate the feasibility of selection for growth of organic Nile tilapia. Meanwhile, organic certifications for Nile tilapia should be instituted for better prices and increased profits of organic fish.
机译：由于人们相信有机产品对消费者和环境更安全，更健康，人们食用有机产品的需求一直在增长。在发展中国家，尼罗罗非鱼（Oreochromis niloticus）通常在低投入的有机饲料池塘中生长，很少或没有高蛋白补充饲料，这是一种适合生产有机鱼的环境。然而，来自这种生产系统的尼罗罗非鱼不能获得大尺寸，这导致池塘产量低。本文介绍了通过选择在有机肥料土池中生长来改善有机养殖罗非鱼性能的尝试的结果。选择环境包括每天用50千克干物质（dm）/公顷鸡粪施肥的土池。体重随选择而增加，并记录了实质性反应。肠道长度随着体重的增加而增加。此外，肠道长度和体重在遗传上高度相关，表明选择在草食上生长的罗非鱼可能会长肠，从而增加营养吸收能力和效率。综上所述，这些结果证明了选择生长有机尼罗罗非鱼的可行性。同时，应建立尼罗罗非鱼的有机认证，以提高价格并增加有机鱼的利润。

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