Biswas Amal, Shirakawa Shota, Okimura Satoshi, Honryo Tomoki, Tanaka Hideki
Aquaculture Research Institute, Kindai University, Uragami 649-5145, Wakayama, Japan.
RegenWorks Co., Ltd., Iwayado, Odaka, Minamisoma 979-2157, Fukushima, Japan.
Animals (Basel). 2024 Dec 23;14(24):3711. doi: 10.3390/ani14243711.
The suitability of tuna by-product meal (TBM) as a replacement for fish meal (FM) in the diet of juvenile greater amberjack was investigated for its effect on growth, mercury (Hg) levels in the fish body, phosphorus (P) load, and plasma chemistry. FM was the main protein source in the control diet (C), and it was replaced by TBM at 25%, 50%, 75%, and 100% to formulate diets TM25, TM50, TM75, and TM100, respectively. The experiment was performed in triplicate, stocking 30 juveniles (mean weight: approximately 6.7 g) in each 500 L tank. After a 42 d rearing period, there were no significant differences in growth, nutrient digestibility, or productive value between diets C and TM25. However, a quadratic polynomial regression analysis suggested that the optimal dietary level of TBM against final weight was 14.5%. A significant linear correlation was observed between Hg in the diet and fish whole body, but the level was far lower, posing health risks to humans. Owing to the lower P intake of fish fed with the TBM-based diets, their P load was significantly reduced compared to the control group. Plasma levels of total protein, total cholesterol, and albumin in the TM75 and TM100 groups were significantly lower than those in the C, TM25, and TM50 groups. These results suggest that 14.5% of FM protein can be replaced by TBM protein in the diet of juvenile greater amberjack and that a significant reduction in P load can be achieved with a TBM-based diet.
研究了金枪鱼副产物粉（TBM）替代幼龄黄条鰤日粮中鱼粉（FM）对其生长、鱼体汞（Hg）含量、磷（P）负荷及血浆生化指标的影响。对照日粮（C）以FM为主要蛋白质来源，分别用25%、50%、75%和100%的TBM替代FM，配制日粮TM25、TM50、TM75和TM100。实验重复进行3次，每个500升水箱放养30尾幼鱼（平均体重：约6.7克）。经过42天的饲养期，日粮C和TM25在生长、营养物质消化率或生产性能方面无显著差异。然而，二次多项式回归分析表明，TBM对终末体重的最佳日粮水平为14.5%。日粮中Hg与鱼体全身Hg之间存在显著的线性相关性，但该水平远低于对人类健康构成风险的水平。由于以TBM为基础日粮喂养的鱼磷摄入量较低，与对照组相比，它们的磷负荷显著降低。TM75和TM100组的血浆总蛋白、总胆固醇和白蛋白水平显著低于C、TM25和TM50组。这些结果表明，幼龄黄条鰤日粮中14.5%的FM蛋白可被TBM蛋白替代，且以TBM为基础的日粮可显著降低磷负荷。
