幼生採集より推定されるウナギの産卵成長と漂流〔英文〕

概要

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The larval growth and drift of the Japanese eel were analysed with all of the leptocephali amountingto 109 to date. The relation between TL and collection dates of leptocephali was well expressed with von Bertalanffy and Gompertz equations. The birth date (late May) by the former equation was considered to be more appropriate than that by Gompertz because of the better fit of Bertalanffy equation to the growth of the larvae raised from artificially fertilized eggs. Within the area of leptocephali collection (115°-144°E, 10°-30°N), small size leptocephali were collected from the eastern and southern half (>130°E, <20°N) in June and July, most of medium size ones from the western and southern half in September, and large size ones exclusively from the western and northern half in November-January. Although there was a bias of collection efforts, this shift of collection areas was attributed to larval drift by the ocean surface currents.
日本水産學會の論文