Age and growth of the narrownose smooth-hound Mustelus schmitti (Carcharhiniformes, Triakidae) in coastal waters of the Chubut province, Patagonia, Argentina
DOI:
https://doi.org/10.25260/EA.24.34.1.0.2251Keywords:
growth modelling, longevity, age at maturity, Southwest AtlanticAbstract
The narrownose smooth-hound, Mustelus schmitti (Carcharhiniformes, Triakidae) is an endemic shark of the southwest Atlantic Ocean and it is listed as critically endangered by the IUCN. The age and growth of M. schmitti were studied using vertebrae of 102 females and 121 males caught as by-catch by the bottom-trawl shrimp fishery and by coastal sport anglers in Central Patagonia (43-44° S). The maximum ages observed for females and males were 18 and 16 years, respectively. Seven growth (size-at-age) models were fitted. The two-phase von Bertalanffy model presented the best fit for females and males. There were no differences in growth between sexes. Growth parameters were asymptotic length (L∞)=916 mm; growth coefficient (k)=0.12 years-1; age at which the transition between the two growth phases occurs (th)=5.26 years; length at birth (L0)=283.03 mm, and longevity (tmax)=21.92 years. The age at sexual maturity was estimated at 8.86 and 8.48 years for females and males, respectively. M. schmitti exhibits moderate growth, relatively long lifespan and late maturity, like other elasmobranchs characterized as extremely vulnerable.
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