Estimation of Population Size of Juvenile Ayu in the Eastern Coastal Waters Facing Kii Channel
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概要
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Using the method of DeLury, the initial population size (<I>N<SUB>0</SUB></I>) of marine juvenile ayu (<I>Plecoglossus altivelis altivelis</I>) in the eastern coastal waters of Kii Channel was estimated as 376-4949 (×10<SUP>4</SUP>) from 1991 to 2004. Annual estimations of the initial population size (<I>N<SUB>0</SUB></I>) fluctuated widely, indicating that the stock is in an unstable condition. Exploitation rate (<I>C/N<SUB>0</SUB></I>) ranged from 0.65 to 0.87, and was over 0.7 in most years. Significant positive correlations were found between the initial population size (<I>N<SUB>0</SUB></I>) and total catch in number of individuals (<I>C</I>), as well as between the initial population size (<I>N<SUB>0</SUB></I>) and remaining number of individuals (<I>N<SUB>0</SUB>-C</I>) . As the annual quantity of down-wept ayu larvae in the Hidaka River increased the following year's initial population size (<I>N<SUB>0</SUB></I>) tended to increase. These results suggest that increasing the quantity of down-wept larvae and catch control of juveniles are effective to maintain stability of the stock.
- 日本水産増殖学会の論文
日本水産増殖学会 | 論文
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