Age, Growth and Reproduction of Two Species of Scad, Decapterus macrosoma and D. macarellus in the Waters off Southern Kyushu

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
本文フルテキスト
44-02-13.pdf2.93 MB

Growth and reproductive characteristics of shortfin scad Decapterus macrosoma and mackerel scad D. macarellus collected in the waters off southern Kyushu were determined based on otolith readings and gonad histology, respectively. Translucent and opaque zones on sectioned otoliths were identified, and the number of opaque rings counted. Von Bertalanffy growth parameters of both species did not significantly differ between males and females, and the combined growth curves of D. macrosoma and D. macarellus were as follows: FLt = 346 [1 - exp {- 0.456 (t + 0.771)}] and FLt = 428 [1 - exp {- 0.310 (t + 0.821)}], respectively, where FLt is fork length (mm) at age t. The spawning period was evaluated to be from May to August for D. macrosoma and from April to July for D. macarellus based on the monthly changes in the gonadosomatic index and histological observations. The fork length at 50% maturity of females was estimated as 238 mm for D. macrosoma and 258 mm for D. macarellus, and maturity age was estimated for both species as 2 years old.

刊行年月日
作成者 SHIRAISHI Tetsuro TANAKA Hiroshige OHSHIMO Seiji ISHIDA Hirohumi MORINAGA Norimasa
著者キーワード

gonad histology

maturity age

otolith

spawning period

公開者 Japan International Research Center for Agricultural Sciences
オンライン掲載日
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
44
2
開始ページ 197
終了ページ 206
DOI 10.6090/jarq.44.197
権利 Japan International Research Center for Agricultural Sciences
言語 eng

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