TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 61 (No. 3), pp. 569-573, 2005

Age and Growth of Sillago aeolus in Okinawa Island, Japan

Md. Habibur Rahman* and Katsunori Tachihara

Department of Marine and Environmental Sciences, Faculty of Science, University of the Ryukyus, Senbaru, Nishihara, Okinawa 903-0213, Japan

(Received 14 September 2003; in revised form 15 April 2004; accepted 15 April 2004)

Abstract: In a study of the age and growth of Sillago aeolus, a total of 414 fish were collected from December 2000 to March 2002, around Okinawa Island. Ages of 403 specimens were determined by otoliths. Monthly changes in the percentage of otoliths with an opaque zone in the outer margin indicated that an opaque ring formed once a year, occurring between February and May. The rings can therefore be defined as annual rings. Ages of females were estimated to be 0+ to 4+, while those of males were 0+ to 2+. The von Bertalanffy growth curves were well fitted to age-standard length data of males and females, as follows:

Male: Lt = 209.6 [1 - exp{-0.70 (t + 0.58)}].

Female: Lt = 297.7 [1 - exp{-0.42 (t + 0.61)}].

*Corresponding author E-mail: habibur32@yahoo.com

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