The Effect of Replacing Fish Meal with Fermented Stickwater on Growth, Antioxidant Capacity, Protein Metabolism and Related Gene Expression of Juvenile Turbot (Scophthalmus maximus L.)

• Main Authors: Cong XU, Jiying WANG, Tiantian HAO, Baoshan LI, Bingshan HUANG, Yongzhi SUN, Xiaoyan WANG, Chengqiang WANG, Tihong CAO
• Format: Article in Journal/Newspaper
• Language: English; Chinese
• Published: Science Press, PR China 2023
• Subjects: fermented stickwater; fish meal; replacement; metabolism; Aquaculture. Fisheries. Angling; SH1-691; Scophthalmus maximus; Turbot
• Online Access: https://doi.org/10.19663/j.issn2095-9869.20210913003; https://doaj.org/article/f0afa7a19f174dea9f75722cbb848a2a

With the rapid development of the aquaculture industry and the shortage of global fishery resources, the contradiction between supply and demand of fish meal has become increasingly significant. Therefore, finding new substitutes for fish meals and reasonably reducing the amount of fish meal in formula feed has become an important research topic in aquatic feed. Stickwater is a byproduct of fishmeal processing. It contains many water-soluble molecules, such as small molecular peptides, biogenic amines, taurine, and high unsaturated fatty acids. These components are regarded as particular nutrients or bioactive substances in the fish meal. Studies have shown that stickwater can replace part of fish meal in recent years and achieve good results in fish and other aquatic animals. The fermented feed has excellent advantages for fish meal replacement. Studies have shown that after fermentation, the contents of anti-nutritional factors in plant raw materials are decreased.In contrast, the contents of small peptides and free amino acids are increased, the nutrient composition is changed, and the intermediate metabolites of microorganisms are obtained, which can further improve the replacement level of fish meal. There are few studies on the fermentation of feed materials, such as fish meal and stickwater, which do not contain anti-nutritional factors. Our laboratory's preliminary study found that stickwater combined with other animal and plant proteins could replace 40% of fish meal in the feed. This experiment fermented stickwater first, then replace fish meal in high plant protein formula feed with fermented stickwater (FSW), aims to further increase the amount of fish meal replacement, reduce the negative effect of the plant protein source on the turbot, for FSW application in feeds for turbot provide a theoretical reference.The stickwater in the experiment was a brown viscous liquid, with a water content of 48.73%, dry matter crude protein content of 64.08%, and crude fat content of 8.91%. The strains used were ...