Three-season enhancement and releasing method for salmons in spawning area rivers

Abstract

The invention belongs to the technical field of proliferation and maintenance of fishes, and discloses a three-season enhancement and releasing method for salmons in spawning area rivers. The salmonsare highly anadromous fishes, and are artificially migrated to river sections with functions of a spawning area or branch water areas of the river sections for enhancement and releasing, a preferablespecific optimized upstream migration route capable of arriving at the spawning area is designed and selected for returning to the community (parent fishes), and propagation of generations of proliferation groups is realized; salmon releasing groups such as fertilized eggs or eyed eggs, juvenile fishes and parent fishes at different fresh water life history stages are migrated to spawning area rivers with suitable habitats, enhancement and releasing are carried out at three seasons including the winter, the spring and the autumn, and the diversity and the adaptability of the proliferation groups are improved. By the method of manually assisting in field incubation of fish eggs and natural proliferation of parent fishes, investment of enhancement and releasing infrastructure construction ofthe fishery can be reduced, the occupied area of permanent work is reduced, and the production cost for artificial incubation of juvenile fishes with the equal releasing number is saved.

Description

technical field [0001] The invention belongs to the technical field of fish multiplication and maintenance, and in particular relates to a three-season multiplication and release method for salmon fish in spawning grounds. Background technique [0002] At present, the commonly used existing technology in the industry is as follows: salmon is a highly anadromous cold-water fish, which is naturally distributed in the North Pacific Ocean and the Arctic Ocean at 35°~73°N, 120°E~123°W It is a unique species of the northern Pacific Ocean and its coastal rivers. It connects marine and freshwater ecosystems. It is an important indicator species of ecological environment. It is a world-renowned marine grazing fish and has high scientific value. and economic value. Salmon fish meat is rich in nutrition, and its roe has higher nutritional value, which is the internationally famous red caviar. There are currently six migratory salmon species in the North Pacific Ocean, belonging to th...

AI Technical Summary

Problems solved by technology

First of all, there is no release in specific tributary waters of rivers such as the spawning ground river in its original habitat according to the life history of salmon fish and the natural habitat and distribution of freshwater life period. Artificial breeding does not cover the spawning grounds and rivers where the reproductive populations of salmon fishes have disappeared, and cannot play a role in population recovery or reconstruction of key habitats, let alone achieve the purpose of natural proliferation and natural recovery

Secondly, there is no field environment adaptation period for artificially bred juvenile fish or wild domestication and release, resulting in a decrease in the survival rate of juvenile fish, and an unstable return rate of artificially multiplied populations, which affects the effect of multiplication and release or marine grazing

Third, there is only one type of artificial breeding and release population, juvenile fish, and there is no breeding and release of marijuana and fish embryos (fertilized eggs, eye eggs) and broodstock. Considering that most spawning grounds are relatively remote and the transportation distance is long Long, complex road conditions, increased difficulty in transportation, and difficult to guarantee the number, release time and survival rate of release

[0005] (1) At present, there are no river releases based on the unique life history of salmon return to the mother river and the natural habitat distribution of freshwater life cycle in China. Most of the release sites are in the middle and lower reaches of the main stream, and the returning populations migrate upward. Short, there are no accessible spawning grounds for breeding along the way, artificial breeding does not cover the spawning grounds and rivers where the reproductive populations of salmon fishes have disappeared, and cannot play a role in population recovery or reconstruction of their key habitats, let alone transition to natural purposes of proliferation and natural recovery.

[0006] (2) There is no field environment adaptation period for artificially bred juvenile fish or wild domestication and release, resulting in a decrease in the survival rate of juvenile fish;

[0007] (3) There is only one type of artificial breeding and release population, juvenile fish, and there is no breeding and release of marijuana and fish embryos (fertilized eggs, eye eggs) and broodstock. Considering that most spawning grounds are relatively remote and the transportation distance is relatively long Long, complex road conditions, increased difficulty in transportation, and difficult to guarantee the number, release time and survival rate of release

[0008] Difficulty and significance of solving the above technical problems: The existing breeding and releasing sites and releasing methods have been implemented for many years, but the expected effect and purpose of protecting the survival, population reproduction and resource proliferation of salmon species in the entire watershed have not been achieved, and the input cost is relatively high , the ecological benefits, economic benefits and social benefits are not ideal, so far it is difficult to find a solution to the problem in terms of technology and management

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