Fecundity regulation strategy of the blue jack mackerel,  Trachurus picturatus  (Bowdich, 1825), off Madeira Island (NE Atlantic)

Vasconcelos, Joana; Faria, Graça; Freitas, Rita; Gordo, Leonel Serrano

doi:10.1016/j.fishres.2017.02.009

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…The adjusted Pearson residuals were estimated to find the values driving the significance of these tests. The biological annual cycle was split into three periods following biological information available for the species Santamaría, 2011, 2013;Vasconcelos et al, 2017a) and models proposed to Trachurus spp. (Gerlotto et al, 2012;Tuset et al, 2019): breeding (January-April), feeding/ breeding-recovery (May-July), and recruitment (August-December).…”

Section: Discussionmentioning

confidence: 99%

Thinking of Fish Population Discrimination: Population Average Phenotype vs. Population Phenotypes

Vasconcelos

Jurado-Ruzafa²,

Otero-Ferrer³

et al. 2021

Front. Mar. Sci.

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The genetic polymorphism and phenotypic variation are key in ecology and evolution. The morphological variability of the contour of fish otoliths has been extensively used for the delimitation of stocks. These studies are conventionally based on average phenotype using elliptic Fourier analysis and lineal discriminant analysis as classifier. Considering new analytical options, such as the wavelet transform and non-parametric algorithms, we here analyzed the otolith shape of Trachurus picturatus (blue jack mackerel) from mainland Portugal, Madeira, and the Canaries. We explore the phenotypic variation throughout a latitudinal gradient, establish a hypothesis to explain this variability based on the reaction norms, and determine how the use of average phenotype and/or morphotypes influences in the delimitation of stocks. Four morphotypes were identified in all regions, with an increase of phenotypes in warmer waters. The findings demonstrated that stocks were clearly separated with classification rates over 90%. The use of morphotypes, revealed seasonal variations in their frequencies and per region. The presence of shared phenotypes in different proportions among fishing grounds may open new management approaches in migratory species. These results show the importance of the phenotypic diversity in fisheries management.

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Section: Discussionmentioning

confidence: 99%

Thinking of Fish Population Discrimination: Population Average Phenotype vs. Population Phenotypes

Vasconcelos

Jurado-Ruzafa²,

Otero-Ferrer³

et al. 2021

Front. Mar. Sci.

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“…This type of fecundity has been suggested for many multiple spawning fish, such as chub mackerel S. japonicus (Dickerson et al ., 1992); sardine, Sardina pilchardus (Ganias et al ., 2004); Atlantic horse mackerel, Trachurus trachurus (Gordo et al ., 2008); anchovies sp. (Murua & Saborido-Rey, 2003); and blue jack mackerel, Trachurus picturatus (Vasconcelos et al ., 2017). In contrast to this, the congeneric and partially sympatric Atlantic mackerel Scomber scombrus is considered to be a determinate spawner (Greer-Walker et al ., 1994).…”

Section: Discussionmentioning

confidence: 99%

Reproductive parameters of Atlantic chub mackerel Scomber colias in M'diq Bay, Morocco

2018

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Reproductive biology of Atlantic chub mackerel (Scomber colias) was studied based on samples from commercial catches in M'diq Bay, Morocco. Females predominated in the total catch (54%), their size at first maturity being 19.19 ± 0.43 cm TL. A minimum landing size (MLS) of 21 cm is suggested. The oocyte size frequency distribution and histological analysis confirmed that S. colias is a species with an indeterminate fecundity. The batch fecundity was estimated as 18,452–131,642, with a mean of 60,022 oocytes. The relative batch fecundity was 157–360, with a mean of 279 eggs g−1.

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“…Length maturity ogives by sex were fitted to observe data collected during the spawning season (Vasconcelos et al., ) for the same above‐mentioned periods (2002–2005, 2006–2009, 2010–2013 and 2014–2016), and assuming that fish classified in maturity stages II to V were mature.…”

Section: Methodsmentioning

confidence: 99%

“…Information on the biology of this species around Madeira is scarce and limited to only one study on age and growth (Vasconcelos et al, 2006) and another on fecundity regulation strategy (Vasconcelos, Faria, Freitas & Gordo, 2017a). A few biological studies have been carried out on the blue jack mackerel from the Azores (Garcia, Pereira, Canha, Reis & Diogo, 2015;Isidro, 1990) and Canary Islands (Jurado-Ruzafa & Santamaría, 2013).…”

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Stock assessment of the blue jack mackerel, Trachurus picturatus, in the North‐eastern Atlantic

Vasconcelos

Sousa

Riera

et al. 2018

Fisheries Management Eco

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A total of 49,151 blue jack mackerel, Trachurus picturatus, (Bowdich) was collected in Madeira Island (North‐eastern Atlantic) between 2002 and 2016 to evaluate possible influence of fishing on landings and reproductive parameters. A decreasing trend in the length composition was observed over the study period and length at first maturity decreased by 2.78 cm TL. Maximum yield per recruit decreased from 2002 to 2016 but the corresponding fishing mortality was constant (Fmax = 0.4/year). Considering the fishing mortality level in 2016, it is evident that the stock may be exploited beyond its sustainability limit. Amendments of the purse‐seine fishing regulations and implementation of measures to reduce fishing effort are suggested.

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Fecundity regulation strategy of the blue jack mackerel, Trachurus picturatus (Bowdich, 1825), off Madeira Island (NE Atlantic)

Cited by 11 publications

References 10 publications

Thinking of Fish Population Discrimination: Population Average Phenotype vs. Population Phenotypes

Thinking of Fish Population Discrimination: Population Average Phenotype vs. Population Phenotypes

Reproductive parameters of Atlantic chub mackerel Scomber colias in M'diq Bay, Morocco

Stock assessment of the blue jack mackerel, Trachurus picturatus, in the North‐eastern Atlantic

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