Relation of Recruitment to the Number of Caught Juveniles in the Ayu Population of Lake Biwa

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  • Suzuki Naoki
    Department of Fisheries Resource Management, Tokyo University of Fisheries
  • Kitahara Takeru
    Department of Fisheries Resource Management, Tokyo University of Fisheries

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  • Relation of Recruitment to the Number o

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The purpose of this study was to find a method of predicting the recruitment size of the ayu Plecoglossus altivelis population, using the data obtained in certain surveys before the main fishing season. In the ayu population of Lake Biwa it is known that the survival rate in the early life history depends on the population density. Adopting the population size at the beginning of February as therecruitment size, we theoretically derived a general relationship between the recruitment size and the mean number of juveniles caught by a net survey in December. We then calculated the recruitment size that satisfied the derived relation as closely as possible, using a cohort analysis. We found that the obtained relation can give a practical estimate of the recruitment size from the mean numberof juveniles caught in December.

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