Reproductive biology of blue marlin (Makaira nigricans) in the western Pacific Ocean

Sun, Chi-Lu and Yi-Jay Chang, Yi-Jay Chang and Chien-Chung Tszeng, Chien-Chung Tszeng and Su-Zan Yeh, Su-Zan Yeh (2009) Reproductive biology of blue marlin (Makaira nigricans) in the western Pacific Ocean. Fishery Bulletin, 107(4), pp. 420-432.

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Abstract

The reproductive biology of blue marlin (Makaira nigricans) was assessed from 1001 fish (ranging from 121 to 275 cm in eye-to-fork length; EFL) caught by Taiwanese offshore longliners in the western Pacific Ocean from September 2000 to December 2001 and from 843 gonad samples from these fish, The overall sex ratio of the catch was approximately 1:1 dur ing the sampling period, but blue marlin are sexually dimorphic; females are larger than males. Reproductive activity (assessed by histology), a gonadosomatic index, and the distribution of oocyte diameters, indicated that spawning occurred predominantly from May to September. The estimated sizes-at-maturity (EFL50) were 179.76 ±1.01 cm (mean ±standard error) for females and 130 ±1 cm EFL for males. Blue marlin are multiple spawners and oocytes develop asynchronously. The proportion of mature females with ovaries containing postovulatory follicles (0.41) and hydrated oocytes (0.34) indicated that the blue marlin spawned once every 2–3 days on average. Batch fecundity (BF) for 26 females with the most advanced oocytes (≥1000 μm), but without postovulatory follicles, ranged from 2.11 to 13.50 million eggs (6.94 ± 0.54 million eggs). The relationships between batch fecundity (BF, in millions of eggs) and EFL and round weight (RW, kg) were BF = 3.29 × 10 –12 EFL5.31 (r2 = 0.70) and BF = 1.59 × 10–3 RW 1.73 (r2= 0.67), respectively. The parameters estimated in this study are key information for stock assessments of blue marlin in the western Pacific Ocean and will contribute to the conservation and sustainable yield of

Item Type: Article
Title: Reproductive biology of blue marlin (Makaira nigricans) in the western Pacific Ocean
Personal Creator/Author:
CreatorsEmail
Sun, Chi-Lu
Yi-Jay Chang, Yi-Jay Chang
Chien-Chung Tszeng, Chien-Chung Tszeng
Su-Zan Yeh, Su-Zan Yeh
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 107
Number: 4
Page Range: pp. 420-432
Date: 2009
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8774
Depositing User: Patti M. Marraro
Date Deposited: 10 Jun 2012 09:00
Last Modified: 10 Jun 2012 09:00
URI: http://aquaticcommons.org/id/eprint/8774

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