The effects on growth and body composition that result from tuna byproduct meal (TBM) substituted for fish meal in the diet of juvenile abalone, Haliotis discus, were determined. One thousand two hundred sixty juvenile abalone were randomly distributed into 18 70‐L plastic rectangular containers. Six experimental diets were prepared in triplicate. The TBM0 diet included 28% fish meal and 13% soybean meal as the protein source. Twenty‐five, 50, 75, and 100% of the fish meal were substituted with TBM. Finally, salted sea tangle was prepared. The essential amino acids, such as isoleucine, lysine, and valine, tended to decrease with the dietary substitution of TBM for fish meal in the experimental diets. The weight gain and specific growth rate (SGR) of abalone that were fed the TBM25 diet were higher than those of abalone that were fed the other diets. The crude protein content of the soft body of the abalone linearly decreased with the dietary substitution of TBM for fish meal. In conclusion, as much as 75% of the fish meal in the diet of abalone can be replaced with TBM without retardation in weight gain and SGR of the abalone when 28% fish meal was included.

Whether the inclusion of the various sources of commercially available dietary additives [ginger (GG), cheonggukjang (CJ), blueberry (BB), persimmon (PM), tomato (TT), broccoli (BC) and yacon (YC)] has an effect on growth, body composition, and challenge test survival of juvenile rockfish Sebastes schlegeli was investigated. Twenty-four groups of 70 fish (1680 in total) were each fed one of eight experimental diets: a control diet (Con) without additives, and diets containing GG, CJ, BB, PM, TT, BC or YC. Fish were hand-fed to satiation twice daily for 7 weeks. At the end of this period, 20 fish from each tank were infected with Streptococcus parauberis and monitored for 10 days. Fish fed the YC diet had greater weight gain compared with fish fed the other diets. Feed efficiency and protein efficiency ratio of fish fed the TT and YC diets were higher than of fish fed other diets. Cumulative mortality of fish fed the GG, BB, and YC diets was lower than of fish fed the other diets on day 5 post infection. We conclude that yacon was the best dietary additive for improving rockfish weight gain, while ginger, blueberry, and yacon effectively lowered mortality of rockfish infected with S. parauberis.

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