The optimum feed for herring: In 2005, pond cultivation trials in the Anhui and Heilongjiang provinces with the American Soybean Association-International Project 32/6 soybean meal feed from herring fingerlings to commercial fish were conducted, resulting in slow fish growth, feed conversion factors and The result of unstable economic returns. The American Soybean Association-International Project 32/6 feed is a standard feed for fish cultures such as salmon, squid, tilapia, and channel catfish, and it can usually obtain fast fish growth and feed. High conversion efficiency results. However, based on the experimental results of rearing herring in 32/6 feed in 2005, the test partners suggested that the protein level of the feed should be further increased in future experiments to improve the growth and feed conversion efficiency of herring. According to this proposal, we conducted two culture experiments in 2006 to verify the breeding effect of the 32- and 7-type fingerling feeds of the American Soybean Association-International Project as feed for the cultivation of 2 and 3 years old herring. The U.S. Soybean Association-International Project's Type 36/7 feeds are normally used only when bred from fingerlings to approximately 50 g, and have higher crude protein and crude fat levels than Type 32/6 adult fish feeds (Table 1). ~3).
The 2006 experimental plan for herring culture was completed within four or five months, depending on the water temperature and climatic conditions in each test area. The data of the survival rate, gross and net yield, average fish body weight and feed conversion efficiency of the two trials at the time of harvest were recorded. In order to obtain the above data, all fish in each of the three fish ponds tested were counted and weighed. The herring and trout in each pond were sampled to estimate the average weight of the fish. The total input costs for each trial are documented to calculate the economic benefits of high protein feed cultured herring.
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