Abstract
To explore which lifestages affect the stock size of young-of-the-year mantis shrimp Oratosquilla oratoria in Tokyo Bay, Japan, we investigated interannual variations in the quantitative relationships among egg production, larval density, and juvenile density. We collected adult females, larvae, and juveniles during monthly field surveys from 2004 to 2007. The interannual trend for the juvenile density index differed from those for egg production and larval density; although indices of both egg production and larval density were high in 2004 and 2007, the juvenile density index was high only in 2007, suggesting high mortality during the pelagic larval stage or the early phase of the postsettlement juvenile stage in 2004. We found that larval settlement started at the end of August and peaked in October, although larvae from the early spawning season (May–June) should have settled in August or earlier. Juveniles were found throughout the bay except in areas where bottom hypoxia occurred, suggesting that hypoxia restricts the spatial distribution of juveniles. Our results suggest that mortality during the early life history fluctuates among years, probably because of changes in environmental conditions in the bay, resulting in interannual variation in the stock size of young-of-the-year juvenile O. oratoria.








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Acknowledgments
We thank the staff of the National Institute for Environmental Studies, Chiba Prefectural Fisheries Research Center, and Kanagawa Prefectural Fisheries Technology Center, as well as the fishermen of Chiba and Kanagawa Prefectures for their help with field sampling. This study was supported in part by a Sasakawa Scientific Research Grant from the Japan Science Society (16-403M), a Grant for Exploratory Research (FY 2004–FY 2005) from the National Institute for Environmental Studies, and a Grant-in-Aid for Research Fellows of the Japan Society for the Promotion of Science (19-8193).
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Kodama, K., Oyama, M., Lee, JH. et al. Interannual variation in quantitative relationships among egg production and densities of larvae and juveniles of the Japanese mantis shrimp Oratosquilla oratoria in Tokyo Bay, Japan. Fish Sci 75, 875–886 (2009). https://doi.org/10.1007/s12562-009-0104-2
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DOI: https://doi.org/10.1007/s12562-009-0104-2