Age and growth of Gerres sp. (Perciformes: Gerreidae) in Okinawa Island of Southern Japan |
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Authors: | M K Kanak Katsunori Tachihara |
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Institution: | (1) Department of Marine and Environmental Sciences, Graduate School of Engineering and Science, University of the Ryukyus, 903-0213 Nishihara, Okinawa, Japan |
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Abstract: | A total of 518 Gerres sp. were collected around Okinawa Island, Japan, from November 2002 to July 2005, with monthly sampling where the standard
length of females (n=218) were 56.2–147.1 mm, and males (n=149) were 62.2–139.4 mm. The maximum ages observed for females were 5+ years and males were 4+ years, estimated by transverse sectioned sagittal otoliths. Mean marginal increment indicated that opaque rings were formed
once a year during April to July. The standard length (SL; mm) — body wet weight (BW; g) relationships were described as BW=(3.26×10−5) SL2.97 and BW=(3.13×10−5) SL
2.98 for females and males, respectively, and the standard length at age described by von Bertalanffy growth function for females,
L
t=137.1(1−e−0.80t+0.80]) and males, L
t=127.3(1−e−0.82t+0.93]). |
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Keywords: | age and growth Gerres sp Okinawa Island |
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