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Life history parameters of blue jack mackerel Trachurus picturatus (Teleostei: Carangidae) from north-east Atlantic

  • Alexandra Garcia (a1), João g. Pereira (a1), Ângela Canha (a1), Dália Reis (a1) and Hugo Diogo (a1)...


Blue jack mackerel Trachurus picturatus monthly samples were collected between 1998 and 2011 to determine morphometric relationships, maturity, growth rates, reproduction and spawning seasonality in north-east Atlantic waters (ICES area Xa2). A total of 2895 specimens were sampled, ranging from 98 to 542 mm in fork-length (LF). The morphometric relationships (length-length and length-weight) showed statistically significant differences between sexes. Ages were estimated by counting growth bands on otoliths and verified by marginal increment analysis, with specimens ranging from 0 to 18 years. The von Bertalanffy models used to estimate growth parameters for both observed and back-calculated length-at-age data gave good fits. The gonads were analysed macroscopically and the spawning season found to occur from December to May. The length at 50% maturity for females and males occurred at 277 mm LF (4.3 years) and 288 mm LF (5.1 years), respectively. The results provide important biological information for fisheries assessment of a species that plays an important key role in the surrounding ecosystem.


Corresponding author

Correspondence should be addressed to: A. Garcia, Department of Oceanography and Fisheries (DOP), University of the Azores, Rua Prof. Doutor Frederico Machado, 9901-862 Horta, Portugal email:


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Life history parameters of blue jack mackerel Trachurus picturatus (Teleostei: Carangidae) from north-east Atlantic

  • Alexandra Garcia (a1), João g. Pereira (a1), Ângela Canha (a1), Dália Reis (a1) and Hugo Diogo (a1)...


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