Reproductive cycle of the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off the Portuguese continental coast

This work provides for the first time a description of the reproductive biology of Trachurus picturatus in Portuguese continental waters (between 41º 49' and 36º 57' latitude North). Fish samples, a total of 7409 individuals, between 17.8 cm and 44.3 cm total length, were obtained by bottom trawlers operating on the north western coast of Portugal, between January 2010 and December 2016. The observed sex ratio (♂/♀) was 0.56. Gonads were observed macroscopically and the monthly variations in gonadosomatic index, proportion of actively spawning individuals, hepatosomatic index and Fulton’s condition factor were analysed. Lengths at first maturity couldn’t be determined due to the lack of small fish. Our results seem to indicate that the main spawning season of T. picturatus starts in December and extends until April-May, with a peak in March.

This work provides for the first time a description of the reproductive biology of Trachurus picturatus in Portuguese continental waters (between 41º 49' and 36º 57' latitude North). Fish samples, a total of 7409 individuals, between 17.8 cm and 44.3 cm total length, were obtained by bottom trawlers operating on the north western coast of Portugal, between January 2010 and December 2016. The observed sex ratio (♂/♀) was 0.56. Gonads were observed macroscopically and the monthly variations in gonadosomatic index, proportion of actively spawning individuals, hepatosomatic index and Fulton’s condition factor were analysed. Lengths at first maturity couldn’t be determined due to the lack of small fish. Our results seem to indicate that the main spawning season of T. picturatus starts in December and extends until April-May, with a peak in March.

Disciplines

Fisheries and aquaculture

Location

42N, 36S, -7E, -11W

Data

FileSizeFormatProcessingAccess
64161.csv
243 KoCSVQuality controlled data
How to cite
Costa Ana Maria (2019). Reproductive cycle of the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off the Portuguese continental coast. SEANOE. https://doi.org/10.17882/60664
In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :
Ana Costa (2019). Reproductive cycle of the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off the Portuguese continental coast. Accepted in Aquatic Living Resources.

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