Age, growth and reproduction of the humpback red snapper Lutjanus gibbus off Ishigaki Island, Okinawa |
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Authors: | Atsushi Nanami Takeo Kurihara Yutaka Kurita Yoshimasa Aonuma Nobuaki Suzuki Hideaki Yamada |
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Institution: | (1) Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fisheries Research Agency, 148-446 Fukai-Ota, Ishigaki Okinawa, 907-0451, Japan;(2) Tohoku National Fisheries Research Institute, Fisheries Research Agency, 3-27-5 Shinhama-cho, Shiogama Miyagi, 985-0001, Japan |
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Abstract: | The humpback red snapper Lutjanus gibbus (Lutjanidae) is an important species for fisheries in the Kagoshima and Okinawan region of Japan. The present study estimated
the age, growth and reproduction of this lutjanid species in the waters around Ishigaki Island, southern part of Okinawa.
An opaque zone was formed on the otolith every year, and this formation correlated with their spawning season; these zones
were identified as annual rings. Maximum ages of 21 and 24 years were observed for males and females, respectively. The von
Bertalanffy growth parameters clarifying the age–fork length relationship were as follows: L
∞ = 390.5 mm, K = 0.210 year−1 and t
0 = −1.88 year for males, and L
∞ = 303.4, K = 0.256 year−1 and t
0 = −3.05 year for females. The main spawning season was estimated as between May and October, since greater values of gonadosomatic
index for females as well as maturation oocytes and/or postovulatory follicles were observed during those six months. |
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Keywords: | |
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