At present, the primary types of bait used in the farming of marine fish are fresh fish feed and pellet feed. Fresh fish is commonly used in several ways: first, whole fish or small pieces are directly fed to the fish. Second, fish and shrimp are minced, extruded into strips, and then frozen for later use. Third, a mixture of fresh or frozen fish, fish meal, binders, and additives is prepared into soft pellets, similar to concentrates.
On the other hand, pellet feeds for marine fish are typically expanded using advanced puffing technology. As this technology continues to improve, the use of extruded pellets is expected to grow. However, current studies and production results show that the growth performance of extruded pellet feed is generally worse than that of fresh fish bait. This is largely due to imbalanced feed formulations and suboptimal processing techniques.
Due to the poor aquaculture performance of extruded pellets, their high cost, and the less-than-ideal appearance and quality of domestically produced feeds, many farmers find it difficult to accept them. Meanwhile, the use of fresh fish as bait has a feed conversion ratio as high as 8–10. With rising fish prices and unstable supply, the high costs have become increasingly problematic. Moreover, the quality of frozen or fresh fish can vary significantly, often leading to high fat content and deficiencies in certain vitamins. Over time, even in cold storage, fats can oxidize, and other nutrients may degrade, which can lead to health issues such as fatty liver disease and vitamin deficiencies in farmed fish.
Additionally, in densely farmed sea areas, leftover fish bait can deteriorate and pollute the water, increasing the risk of bacterial or viral outbreaks. In recent years, such problems have occurred frequently in coastal fish farms across China, and the situation has been worsening over time. These challenges highlight the urgent need for more sustainable and efficient feeding solutions in marine aquaculture.
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