Age, growth and mortality of Pontinus kuhlii (Bowdich, 1825) (Scorpaeniformes: Scorpaenidae) in the Gorringe, Ampère, Unicorn and Lion seamounts

Authors

  • Rafaela Barros Paiva Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Ana Neves Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Vera Sequeira Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Ana Rita Vieira Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Maria José Costa Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Isabel Domingos Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa
  • Leonel Serrano Gordo Centro de Oceanografia and Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa

DOI:

https://doi.org/10.3989/scimar.03632.28B

Keywords:

Pontinus kuhlii, offshore rockfish, whole otoliths, precision estimators, age and growth, Scorpaenidae, mortality

Abstract


Age and growth of Pontinus kuhlii were studied using otoliths of 153 males and 148 females, with males having a greater length (and age) than females. A high level of agreement was achieved among readers. Due to gear selectivity, only ages above 7 years (males) and 8 years (females) were estimated in whole otoliths. To estimate length-at-age in younger specimens, backcalculation was also considered but its use in otoliths with ages greater than 22 years was not possible because the growth rings were too close to each other. Von Bertalanffy growth parameters were estimated by sex using each of these methods and also using an approach that combines mean length-at-age obtained from backcalculation and direct reading on the otoliths. The likelihood ratio test showed significant differences between sexes in the three approaches and Akaike’s information criterion suggests that the backcalculation approach was the best one for describing P. kuhlii growth: TL=38.89[1-e(-0.07(t+1.96))] and TL=56.50[1-e(–0.04(t+1.87))] for females and males, respectively. Natural mortality estimates varied around 0.15 year–1 and 0.07 year–1 for females and males, while the total mortality estimated for 2011 was 0.33 year–1 for females and 0.21 year–1 for males.

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Published

2013-03-30

How to Cite

1.
Barros Paiva R, Neves A, Sequeira V, Vieira AR, Costa MJ, Domingos I, Serrano Gordo L. Age, growth and mortality of Pontinus kuhlii (Bowdich, 1825) (Scorpaeniformes: Scorpaenidae) in the Gorringe, Ampère, Unicorn and Lion seamounts. scimar [Internet]. 2013Mar.30 [cited 2022Oct.5];77(1):95-104. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1436

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