Effect of feeding rotifers enriched with taurine on growth performance and body composition of Pacific cod larvae Gadus macrocephalus
2005
Matsunari, H.(Tokyo Univ. of Marine Science and Technology (Japan)) | Arai, D. | Koiso, M. | Kuwada, H. | Takahashi, T. | Takeuchi, T.
The present study was conducted to investigate the effect of taurine on the growth performance and body composition of larval Pacific cod Gadus macrocephalus by feeding rotifers enriched with different levels of taurine. Rotifers enriched with three different kinds of enrichment materials (Nannochloropsis, freshwater type of Chlorella, and shark egg) and with or without 400 (mg/l) taurine were given to larvae (TL = 4.3 mm, 0 DAH for 20-day in Exp. 1. Rotifers enriched with 0, 400, 800 and 1200 (mg/l) taurine were given to larvae (TL = 4.3 mm, 0 DAH) for 25-day in Exp. 2. In case of highest, we succeeded in the enrichment of rotifers contained 6 times higher level of taurine compared with the group to without taurine supplementation. Larval growth was significantly improved in fish fed rotifers enriched with taurine. Taurine content in the whole body of the fish fed taurine enriched rotifers was much higher than those with no taurine supplement The growth performance was improved significantly ( P 0.05) with each increase in the level of taurine enrichment. Taurine content in the whole body proportionally increased with the taurine level in the rotifers. These results suggest that taurine enrichment of rotifers is effective to improve the growth in cod larvae, and indicate that cod larvae are dependent on dietary taurine to maintain the body taurine pool.
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