Method for breeding large-size trout in offshore manner in sea area in temperate zone

Abstract

The invention discloses a method for breeding large-size trout in an offshore manner in a sea area in the temperate zone. According to the method, when the temperature of sea water on the surface layer is higher than 18 DEG C, the bred trout is moved into offshore net cages or other breeding devices for further breeding, wherein by means of the offshore net cages or other breeding devices, low-temperature sea water resources on the lower layer can be utilized. The method mainly comprises the steps that in autumn, when the temperature of sea water on the upper layer in a breeding area of the sea area in the temperate zone drops to 18 DEG C or below, trout fingerlings bred in fresh water are acclimatized into the sea water and moved into the net cages or other breeding devices to be further bred to early summer of the next year; in early summer, before the temperature of the water of the upper layer in the breeding sea area is higher than 18 DEG C, the bred trout is moved into the offshore net cages or other breeding devices to be further bred to the next year, wherein by means of the offshore net cages or other breeding devices, the low-temperature sea water resources on the lower layer can be utilized; and around June, before the temperature of the sea water on the upper layer rises to 18 DEG C, the large-size commercial trout is harvested, and the trout can also be continuously bred to the required size. The method can be used for producing the large-size commercial trout, has the beneficial effects of being high in economic benefit, environmentally friendly, low in cost and the like and is an offshore high-quality fish breeding technology which is desiderated in China.

Description

technical field [0001] The invention belongs to the field of aquaculture, and in particular relates to a method for cultivating large-sized salmon and trout commercial fish in an offshore area of ​​a temperate sea area. Background technique [0002] my country is a big mariculture country in the world. In 2014, the total output of mariculture reached 18.13 million tons, but the total output of marine fish farming in my country was only 1.19 million tons, which is not as good as the aquaculture output of Norway (Atlantic salmon is more than 1.5 million tons / year). [0003] The bottleneck restricting the development of my country's marine fish farming industry is mainly the serious pollution of the offshore environment, consumers' concerns about the quality and safety of farmed fish products, and the high water temperature in the breeding sea area is not suitable for breeding high-quality low-temperature-resistant fish. According to expert estimates, the amount of nitrogen dis...

AI Technical Summary

Problems solved by technology

Salmon and trout cultured in ordinary sea cages cannot surviv