Age structure and growth of the rough scad, Trachurus lathami (Teleostei: Carangidae), in the Southeastern Brazilian Bight

33Studies have described the presence of different population units of blue jack mackerel, 34Trachurus picturatus, in the NE Atlantic region. However, the hypothesis of several 35 populations has been subtly questioned due to the high similarity in the otolith shape among 36 some regions. It suggests the possibility of migrations processes connecting them, especially 37 between Madeira, the Canary Islands and the African coast, being the Canary Islands the region 38 with higher potential of mixing due to the oceanographic conditions. In order to explore this 39 hypothesis, we quantified the phenotypic variability in the otolith contour of the blue jack 40 mackerel from Canary Islands using wavelets as mathematical descriptor. Our findings revealed 41 the presence of three otolith phenotypes (M1, M2 and M3) in similar proportions. They were 42 not linked to sex, age and size, but showed temporal variations associated with spawning, 43 recruitment and feeding seasons. The best model to explain the population structure of T. 44 picturatus in the Canary waters was based on local migration triangles and the 'contingent 45 theory', where migrants and residents compose the population. In addition, we estimated 46 different somatic growth parameters linked to these phenotypes. These results suggest a 47 complex population structure in the region with possibility of connectivity with the closest 48 populations inhabiting the Madeira archipelago and the African coast. However, future studies 49 are necessary including the whole Atlantic distribution of the species, with special attention to 50 the seasonal variations in the frequency of these phenotypes to clarify the intraspecific 51 polymorphism and the migratory processes. 52 53 54 55 56 57 58 59 60 61 62

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Geographic Variation in Opisthonema oglinum (Lesueur, 1818) in the Southeastern Brazilian Bight Inferred from Otolith Shape and Chemical Signatures

Vaz‐dos‐Santos

Rautenberg

Augusto

et al. 2023

Fishes

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The thread herring Opisthonema oglinum (Lesueur, 1818) is a small pelagic fish distributed in the western margin of the Atlantic Ocean from the United States to Argentina. It is a target species for diverse commercial fisheries, including the Brazilian industrial purse seine fleets that operate in the Southeastern Brazilian Bight. To investigate the geographic variation in the thread herring populations in this fishing ground, sagittal otoliths were collected from two areas: Rio de Janeiro (RJ: 23°04′ S, 44°03′ W) and Santa Catarina (SC: 26°05′ S, 48°18′ W). Otolith shape analyses and multi-elemental signatures were statistically evaluated using elliptical Fourier descriptors and elemental/Ca ratios. Remarkable differences in the thread herring otoliths between the two areas were found. The previous scenario in which the thread herring constitutes a single panmictic population in the Atlantic Ocean is now debatable. The implications of these results in terms of rational fisheries management for this species are highlighted.

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Age structure and growth of the rough scad, Trachurus lathami (Teleostei: Carangidae), in the Southeastern Brazilian Bight

Cited by 4 publications

References 39 publications

Inter-estuarine Variation in Otolith Chemistry in a Large Coastal Predator: a Viable Tool for Identifying Coastal Nurseries?

Inter-estuarine Variation in Otolith Chemistry in a Large Coastal Predator: a Viable Tool for Identifying Coastal Nurseries?

Otolith phenotypic variability of the blue jack mackerel, Trachurus picturatus, from the Canary Islands (NE Atlantic): Implications in its population dynamic

Geographic Variation in Opisthonema oglinum (Lesueur, 1818) in the Southeastern Brazilian Bight Inferred from Otolith Shape and Chemical Signatures

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