Effects of taurine-enriched early live food (rotifer and Artemia nauplii) on the survival and growth of walleye pollock larvae
2019
Nakagawa, T. (Hokkaido National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Hokkaido (Japan). Akkeshi Laboratory) | Matsunari, H. | Yokota, T. | Tanaka, H. | Funamoto, T. | Ito, S. | Yamamoto, T. | Unuma, T.
Rearing experiments under controlled environmental conditions further our understanding of the population dynamics of walleye pollock Gadus chalcogrammus by supplementing the biological information collected in field surveys. However, walleye Pollock rearing techniques, from eggs to juveniles, still require improvement. In the present study, we investigated the effects of taurine enrichment of early live food on the survival and growth of walleye pollock larvae. Larvae were fed with unenriched (control) and taurine-enriched rotifers (taurine supplementation: 400 mg/ml) from the first feeding until 22 or 23 days post hatching (DPH) in Experiment 1, and with unenriched (control) and taurine-enriched rotifers and Artemia nauplii (taurine supplementation: 800 mg/ml) until 55 DPH in Experiment 2. In both experiments, the survival and growth of the larvae reared on taurine-enriched food were improved, when compared with the control larvae. The growth rates and taurine content of the supplemented larvae were comparable to those of wild-caught larvae. Our findings suggested that taurine enrichment of early live food effectively improved the rearing performance of walleye pollock larvae. Such improvements may facilitate the supply of experimental fish for future laboratory studies on the biological characteristics of the larval and juvenile stages of this species.
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