In 2006, the American Soybean Association, Heilongjiang Fisheries Technology Extension Station, and the Shenyang Fisheries Research Institute of Liaoning Province collaborated on a pond breeding experiment to evaluate the economic benefits of raising highland herring using high-protein soybean meal. The trials were carried out in both Heilongjiang and Liaoning provinces to assess the growth performance of second- and third-instar fish, as well as the overall aquaculture efficiency of local fishermen in northeastern China, using a diet containing 36% crude protein.
Earlier, in 2005, similar trials were conducted in Anhui and Heilongjiang provinces using the American Soybean Association's International Project 32/6 soybean meal feed, which was designed for species like salmon, squid, tilapia, and channel catfish. However, the results showed slower fish growth, less efficient feed conversion, and unstable economic returns when used for herring. This prompted researchers to recommend increasing the protein content in future feed formulations to improve growth rates and feed utilization.
Based on this feedback, two new culture experiments were conducted in 2006 to test the effectiveness of the American Soybean Association's International Project 32/7 feed for raising two- and three-year-old herring. The 36/7 feed is typically used during the fingerling stage, up to about 50 grams, and contains higher levels of crude protein and fat compared to the 32/6 feed used for adult fish (see Table 1–3).
The 2006 herring farming experiments lasted between four to five months, depending on local water temperature and weather conditions. At harvest, survival rates, total yield, net yield, average fish weight, and feed conversion ratios were recorded. To collect this data, all fish in the three experimental ponds were counted and weighed. Herring and trout in each pond were sampled to estimate average fish size. Additionally, the total input costs for each trial were documented to calculate the economic benefits of using high-protein feed in herring aquaculture.
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