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Spawning season, spawning grounds, and egg production of red sea bream in Hiuchi-nada, Seto Inland Sea

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Abstract

The spawning season and grounds of red sea bream in Hiuchi-nada, the central part of the Seto Inland Sea, were described using a new method based on monoclonal antibodies for identifying Pagrus major eggs, and the daily egg production (standardized by the incubation time and survival rate) was estimated. At the peak of spawning (May), the ranges of sea temperature, salinity, and chlorophyll a where red sea bream eggs occurred were 14.8–17.4°C, 32.0–33.0, 0.5–4.4 μg/L, respectively. The main spawning grounds of the red sea bream were confirmed as being the areas near the Geiyo Islands, Misaki Peninsula, Saijyo, Niihama. The spatial spread of red sea bream eggs increased with the egg developmental stage. The ranges of daily egg production in 2005 and 2006 were 0.3–19.3 and 0.2–6.7 × 109 eggs/day, respectively. In Hiuchi-nada, aquaculture farms are located close to the spawning grounds, and the potential spawning population from the aquaculture farms equaled or exceeded that of the estimated spawning population obtained by the egg production method. Red sea bream eggs in Hiuchi-nada might be produced by both wild and aquaculture-based spawning populations.

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Acknowledgments

We thank Dr. M. Yamasaki for valuable discussions and comments on the manuscript, and Mrs. A. Iguchi and M. Tani for their kind assistance with the egg sorting. We are also indebted to the captain and crew of the RV Shirafuji Maru for their assistance with the sampling. This work was supported in part by Research for Assessment and Prediction of Production Rate in Fishery Ground, from the the Fisheries Agency.

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Correspondence to Hiromu Zenitani.

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Zenitani, H., Onishi, Y., Kobayashi, S. et al. Spawning season, spawning grounds, and egg production of red sea bream in Hiuchi-nada, Seto Inland Sea. Fish Sci 75, 55–62 (2009). https://doi.org/10.1007/s12562-008-0005-9

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  • DOI: https://doi.org/10.1007/s12562-008-0005-9

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