如何有效防止和避免化肥对人体危害（How to prevent and avoid chemical fertilizer to harm human body）.docVIP

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如何有效防止和避免化肥对人体危害（How to prevent and avoid chemical fertilizer to harm human body）.doc

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如何有效防止和避免化肥对人体危害（How to prevent and avoid chemical fertilizer to harm human body）

如何有效防止和避免化肥对人体危害（How to prevent and avoid chemical fertilizer to harm human body） Protection of fish resources Fish resources are the material basis of fishery production and other biological resources, must be reasonable development and utilization, in order to reach its highest potential, if unrestricted abuse, so fish resources will be destroyed. Fish breeding and protection is one of the important measures to rational utilization of fish resource is relation to the development of the fishery production, so the problem is more and more attention, through understanding the life rule of fish and the surrounding environment, draw up some effective measures to keep the aquatic resources at a high level, does truly limitless reserve, the point of using them all. Effective breeding protection is based on the biological basis of fish. Therefore, it is necessary to learn more about the breeding habits, spawning capacity and some physicochemical factors of spawning sites. Roughly about breeding protection measures: (1) the closure and areas, in order to protect the mother breed and larvae grow well, and where they are passing through time, certain restrictions on fishing. (2) the fishing size and mesh specification are provided for the protection of immature young fish for growth, so as to avoid resource depletion. According to various fishing targets, the minimum size of the fish allowed to be caught is required to allow enough young fish to grow and reproduce as standard. The specification of the mesh is the size of the mesh, which can be used to catch different kinds of fish. (3) restrictions and prohibiting of fishing gear and fishing methods. Fishing gear and fishing methods that are harmful to fish resources should be banned and banned (such as fish and homework, etc.). (4) artificial planting and transplanting of seedlings and the destruction of enemy animals are designed to increase the yield of fish species and increase unit area. (5) environmental protection wit