SPAWNING DATES, GROWTH AND OTOLITH SIZE OF Acanthopagrus schlegelii (SPARIDAE) EARLY-STAGE JUVENILES IN THE NORTHERN VIETNAMESE COASTS
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Tóm tắt
SPAWNING DATES, GROWTH AND OTOLITH SIZE OF Acanthopagrus schlegelii (SPARIDAE) EARLY-STAGE JUVENILES IN THE NORTHERN VIETNAMESE COASTS
Acanthopagrus schlegelii (Sparidae) is a commercially important euryhaline fish along coasts of eastern Asia from Vietnam to Japan. The timing of the early stages tends to be spatial variation. To clarify the spawning season, growth and otolith sizes of their early stages, collections were made bi-monthly and monthly from October 2014 to September 2015 in the Tien Yen estuary, northern Vietnam. Age determinations from sagitta otoliths were performed in specimens. The spawning season of A. schlegelii occurred during the coldest period of the year from the end of November to early February. Their spawning dates were concentrated around the day of spring tide. The linear regression formulae of standard length (y; mm) on age (x; day) and otolith sagittal radius (y; µm) on standard length (x; mm) were expressed as y = 0.2111x + 2.3195 (r = 0.847) and y = 33.955x - 123.01 (r = 0.921), respectively.
Từ khóa
Black porgy, Tien Yen estuary, Otolith, Age estimation, Cá tráp đen, Cửa sông Tiên Yên, Đá tai, Ước lượng tuổi
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