Reproduction and Early Life Ecology of Abalone Haliotis diversicolor in Sagami Bay, Japan

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概要

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• Studies on the reproduction and early life ecology of an abalone, <I>Haliotis diversicolor</I>, are reviewed, especially focusing on the results of our recent field and laboratory studies in Sagami Bay, Japan. Our four-year monitoring of the occurrence of newly settled post-larvae and changes in adult gonads clearly indicates that the spawning of <I>H</I>.<I> diversicolor</I> in Sagami Bay was triggered by typhoon events with large-scale storms. The abalone could spawn at least twice in a single spawning season, but required an interval of at least 1 month between spawning events. The proportion of adults releasing gametes and the amount of released eggs/sperms from each individual tended to increase on the spawning events occurring later in a spawning season. Higher mortality rates of post-larvae and early juveniles were detected at places which had greater water turbulences and more frequent stone overturning caused by storms. A storm event caused by a typhoon appears to be a necessary cue triggering the synchronous spawning of <I>H</I>.<I> diversicolor</I>, but the violent water turbulence and overturning of stones caused by storms negatively affect the post-settlement survival. Cohorts experiencing lower seawater temperatures due to the later settlement in the spawning season tended to have a slower growth rate than those experiencing higher temperatures, suggesting the temperature-dependent growth of post-larval <I>H. diversicolor</I>. The timing of typhoon-triggered spawning in<I> H. diversicolor</I> was suggested to be an important factor affecting the growth and survival and eventual recruitment of the abalone.

著者

• KAWAMURA Tomohiko

  Ocean Research Institute, The University of Tokyo

• HORII Toyomitsu

  National Research Institute of Fisheries Science, Fisheries Research Agency

• ONITSUKA TOSHIHIRO

  Ocean Research Institute, The University of Tokyo

• Horii Toyomitsu

  National Research Institute Of Fisheries Science Fisheries Research Agency

• Kawamura Tomohiko

  Ocean Research Institute The University Of Tokyo

関連論文

• Dietary value of gametophytes and juvenile sporophytes of the brown macroalga Eisenia bicyclis for juvenile abalone Haliotis diversicolor
• Settlement of larval top shell Turbo (Batillus) cornutus in response to several marine algae
• Identification of juvenile abalone Haliotis diversicolor based on number of open and sealed respiratory pores
• Dietary value of benthic diatoms for post-larval abalone Haliotis diversicolor associated with feeding transitions
• Community and trophic structures of abalone Haliotis diversicolor habitat in Sagami Bay, Japan
• Maturation and spawning of Spratelloides gracilis Clupeidae in temperate waters off Cape Shionomisaki, central Japan
• Gonadal development in early life stages of Spratelloides gracilis
• Reproduction and Early Life Ecology of Abalone Haliotis diversicolor in Sagami Bay, Japan

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