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

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      Zoologia

      Pensoft Publishers

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          Abstract

          The rough scad, Trachurus lathami Nichols, 1920, is a small pelagic species distributed along the West Atlantic coast. It is most abundant in the Southern Brazil (28°30’–34°S) and in the Southeastern Brazilian Bight (SEBB, 22°–28°30’S). The rough scad is fished by purse seines, which main target is the Brazilian sardine, Sardinella brasiliensis (Steindachner, 1879). Age and growth are vital to understand the life cycle of a species, to fishery management and ecosystem modeling. This study aimed to assess the age and growth of T. lathami, to identify its age structure in the SEBB, and to evaluate what causes the wide differences among Trachurus species in terms of body size and growth parameters. Data available on T. lathami was attained between 2008 and 2010 from surveys at SEBB. A total of 278 whole otoliths of T. lathami, total length between 27 mm and 208 mm, were analyzed and compared with the only other source of otolith data, from 1975. Three blind readings were performed and assessed using traditional methods to study fish age and growth. Zero up to eight rings were found, each ring corresponding to one year in the life of an individual of this species. The von Bertalanffy growth model parameters were L∞ = 211.90 mm and K = 0.319 year-1. The results of the analyses have shown similarities between 1975 and 2008-2010, indicating that the otolith development, the growth pattern and the age structure remained stable. T. lathami is the smallest species of Trachurus and it has the highest growth rates among them. This is probably related to the different temperatures where larvae/juvenile and adult grow, to the absence of a strong fishing pressure and to decadal population variability.

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          Most cited references 33

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          Fisheries Biology, Assessment and Management

           Michael King (2007)
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            Accuracy, precision and quality control in age determination, including a review of the use and abuse of age validation methods

             S. Campana (2001)
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              Climate Change and Small Pelagic Fish

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                Author and article information

                Journal
                Zoologia
                Zoologia
                Pensoft Publishers
                1984-4689
                September 07 2017
                September 07 2017
                : 34
                : 1-11
                Article
                10.3897/zoologia.34.e20475
                © 2017

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