Distribution of Japanese temperate bass, <Emphasis Type="Italic">Lateolabrax japonicus</Emphasis>, eggs and pelagic larvae in Ariake Bay |
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Authors: | Manabu Hibino Taro Ohta Takane Isoda Kouji Nakayama Masaru Tanaka |
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Institution: | (1) Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;(2) Present address: Marine Resource Research Center, Aichi Fisheries Research Institute, Toyohama, Minamichita-cho, Aichi 470-3412, Japan;(3) Present address: Tottori Prefectural Fisheries Station, Division of Cultural Fisheries, Ishiwaki, Tomari, Tohaku-gun, Tottori 689-0602, Japan;(4) Present address: Shiga Prefectural Fisheries Experiment Station, Propagation and Breeding Section, Hassaka-cho, Hikone, Shiga 522-0057, Japan |
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Abstract: | We collected eggs and larvae of the Japanese temperate bass, Lateolabrax japonicus, and present horizontal and temporal changes of distribution relative to development and growth during the species pelagic
life history in Ariake Bay. Sampling was conducted from the inner to central region (11 sampling stations) of Ariake Bay using
a plankton net (80 cm diameter, 0.5-mm mesh) from November 2000 to February 2001. Both eggs and larvae were collected most
abundantly in mid-December. The CPUE of eggs in the surface layer was higher than the middle layer, which is in contrast to
that at the larval stage. Most eggs were collected around the central and western regions of the bay. The distribution of
eggs shifted vertically to the middle layer with development. Yolk-sac larvae were collected in the central region of the
bay, and preflexion and flexion larvae were more abundantly collected in the inner region of the bay. The body length of larvae
around the inner bay was larger than in the central region. The pelagic life history can be summarized as follows: eggs are
distributed around the central region of the bay and eggs and larvae expand their distribution to the inner and shallower
waters with growth. We conclude that the shift of vertical distribution in pelagic stages and the hydrographic features of
the middle layer form one of the mechanisms enabling the inshore migration of L. japonicus. |
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Keywords: | Pelagic life history Transportation Isolated population Lateolabrax japonicus Ariake Bay |
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