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Ichthyological Research

, Volume 58, Issue 4, pp 310–314 | Cite as

Size composition and reproductive biology of the ornate jobfish Pristipomoides argyrogrammicus (Lutjanidae) off Ishigaki Island, Okinawa

  • Atsushi NanamiEmail author
Full Paper

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

Pristipomoides argyrogrammicus Body size composition Length–weight relationship Spawning season Fecundity 

Notes

Acknowledgments

I express my grateful thanks to S. Sakihara and T. Sakihara for their assistance with sample collection, S. Mamiya for the laboratory work, and the staff of Ishigaki Tropical Station, Seikai National Fisheries Research Institute, for their support during the present study. I also thank the Yaeyama Fishermen’s Cooperative Association for providing permission to collect the samples.

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Copyright information

© The Ichthyological Society of Japan 2011

Authors and Affiliations

  1. 1.Ishigaki Tropical Station, Seikai National Fisheries Research InstituteFisheries Research AgencyIshigakiJapan

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