notable
发表于 2025-3-21 18:24:18
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BACLE
发表于 2025-3-21 23:28:36
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友好
发表于 2025-3-22 01:26:23
Genetics the same spawn and reared in the same environment. In nature, genetic variation is important because it enables populations to adapt to changing environments and survive. Genetic variation is important in channel catfish farming because the heritable component of variation can be exploited through
abnegate
发表于 2025-3-22 06:00:18
Environmental Requirementsm, the general well-being of the fish is affected. Fish respond to suboptimal conditions (stressors) by modifying metabolism or behavior in an attempt to adapt to the new conditions. Initial reactions (stress responses) include release of hormones that prepare the animal for emergency action by mobi
有特色
发表于 2025-3-22 10:09:40
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abracadabra
发表于 2025-3-22 13:05:19
Breedingding programs based on genetic theory. Commercial channel catfish culture lags far behind most other farm animal culture in using genetic improvement programs to increase productivity, despite indications from research (summarized by Dunham and Smitherman 1987) that considerable progress can be made
abracadabra
发表于 2025-3-22 20:03:10
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ARC
发表于 2025-3-22 21:51:04
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我要威胁
发表于 2025-3-23 03:19:58
Water Quality Management in Pondsish culture. Dissolved oxygen concentrations are near saturation, and the water contains negligible concentrations of carbon dioxide, ammonia, nitrite, or other toxic substances. When fish are stocked and fed, the environment immediately begins to deteriorate and becomes less fit for the fish. The d
Galactogogue
发表于 2025-3-23 07:31:08
Feeds and Feeding Practicesh is considered minuscule. The nutritional requirements of cultured catfish are met by using a feed that is formulated to provide all required nutrients (a complete feed) in the proper proportions necessary for rapid weight gain, high feed efficiency, and desirable composition of gain. Feed cost rep