Formula and production method of puffed feed for speckled trouts

Abstract

The invention discloses a formula and a production method for a puffed feed for speckled trouts and aims to provide the puffed feed which is suitable for the digestion physiological characteristics of the speckled trouts, good in palatability, high in disease resistance and high in nutrient digestibility, and can lower the use amount of fish meal, solve the problem of the shortage of fish meal resources, reduce the addition of inorganic phosphorus sources, lower phosphorus pollution to an aquaculture water body so as to promote the development of the speckled trout cultivation industry in China. According to the invention, due to the optimization of the conventional formula of the puffed feed, the problem of overhigh content of fish meal in the conventional puffed feed is solved, and the nutrient digestibility and palatability of the puffed feed are improved. The puffed feed product disclosed by the invention has the advantages of remarkably prompting the quick growth of the speckled trouts, improving the cultivation survival rate and cultivation digestibility, lowering cultivation cost and discharging of nitrogen and phosphorus, improving the cultivation environment, and the like.

Description

technical field [0001] The invention relates to a formula and a preparation method of an extruded feed for spotted trout and salmon, and belongs to the technical field of aquaculture feed. Background technique [0002] Speckled trout ( salmon salar ) belongs to the genus Salmonidae of the family Salmoniformes. It is named for its spots all over the body. It is commonly known as the noble fish and is a kind of salmon. As a species of salmonids, spotted trout are native to North America, mainly live in oceans or large lakes, and migrate to freshwater rivers to lay eggs. °C, the optimum growth water temperature range is 10-18 °C; the suitable salt range is 0-33‰; the water quality is required to be fresh, and the dissolved oxygen content is above 6mg / L. [0003] Speckled trout has tender meat, unique taste and delicious taste. It is rich in various unsaturated fatty acids and other nutrients needed by the human body, and its taste is better than that of salmon. In addition, ...

AI Technical Summary

Problems solved by technology

At present, in the high-quality feed for spotted trout and salmon abroad, the content of animal protein such as fish meal and shrimp meal is more than 40%, and the feed cost is about 10-12 yuan / Kg. There are obviously two problems in feeding this kind of feed. One is the feed cost. The economic benefits of farming are relatively low; secondly, because animal protein contains a relatively high amount of phosphorus, a large amount of phosphorus that has not been absorbed and utilized by fish is discharged into the environment, resulting in a significant increase in the concentration of phosphorus in the aquaculture water, and the total phosphorus can be Reach 0.31mg / L, active phosphorus can reach 0.25mg / L, exceed the national fishery water quality evaluation standard (0.1mg / L), exceed the national fishery water quality evaluation standard (0.1mg / L), with the extension of breeding time, phosphorus in The continuous accumulation in the water body will inevitably lead to the occurrence of eutrophication in the water body