Size composition and reproductive biology of the ornate jobfish <Emphasis Type="Italic">Pristipomoides argyrogrammicus</Emphasis> (Lutjanidae) off Ishigaki Island,Okinawa |
| |
Authors: | Atsushi Nanami |
| |
Institution: | (1) Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fisheries Research Agency, Fukai-Ota 148-446, Ishigaki Okinawa, 907-0451, Japan |
| |
Abstract: | The ornate jobfish Pristipomoides argyrogrammicus is an important lutjanid species for fisheries in the Okinawan region of Japan. The present study estimated the size composition
and reproduction of this species in the waters around Ishigaki Island, Okinawa Prefecture. The length–frequency distribution
indicated that males grow larger than females. The fork length (FL; mm)–whole body weight (BW; g) relationship and FL–total
length (TL) relationship were as follows: BW = 1.048 × 10−5 FL3.121 and TL = 1.101 × FL + 2.196, respectively. The main spawning season was estimated as between April and August, since higher
gonadosomatic index (GSI) values were found for both sexes, and matured oocytes were observed in females during these months.
The developmental stage of ovaries correlated with the GSI of females. Fecundity ranged from 9,530 to 98,260 oocytes in fish
of 177.0 to 278.0 mm FL, and the FL–fecundity relationship was as follows: fecundity = 9.525 × 10−8 FL4.903. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|