Increasing biological knowledge for better management of by-catch species: age, growth, and mortality of piper and red gurnards (Teleostei: Triglidae)

Vera  Sequeira; Inês  Sousa; Ana  Neves; Ana  Rita Vieira; Elisabete  Silva; Frederica  Silva; Ana Marta  Duarte; Susana  Mendes; Rui  Ganhão; Carlos Alberto  Assis; Rui  Rebelo; Maria Filomena  Magalhães; Maria Manuel  Gil; Leonel  Serrano Gordo

doi:10.3989/scimar.05308.060

Authors

Vera Sequeira MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0001-7173-4982
Inês Sousa MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - CoLAB +ATLANTIC LVT https://orcid.org/0000-0001-9716-7963
Ana Neves MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0003-3885-2738
Ana Rita Vieira MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0002-5640-7999
Elisabete Silva Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0001-6958-134X
Frederica Silva Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa - MARE – Marine and Environmental Sciences Centre, ESTM, Polytechnic of Leiria https://orcid.org/0000-0003-1859-9392
Ana Marta Duarte MARE – Marine and Environmental Sciences Centre, ESTM, Polytechnic of Leiria https://orcid.org/0000-0001-7103-3924
Susana Mendes MARE – Marine and Environmental Sciences Centre, Polytechnic of Leiria https://orcid.org/0000-0001-9681-3169
Rui Ganhão MARE – Marine and Environmental Sciences Centre, ESTM, Polytechnic of Leiria https://orcid.org/0000-0003-4814-3177
Carlos Alberto Assis MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0001-5352-2978
Rui Rebelo Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa- cE3c – Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa https://orcid.org/0000-0003-2544-1470
Maria Filomena Magalhães Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa - cE3c – Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências da Universidade de Lisboa https://orcid.org/0000-0001-7308-2279
Maria Manuel Gil MARE – Marine and Environmental Sciences Centre, Polytechnic of Leiria https://orcid.org/0000-0002-8008-9839
Leonel Serrano Gordo MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa - - Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa https://orcid.org/0000-0002-9144-6061

DOI:

https://doi.org/10.3989/scimar.05308.060

Keywords:

by-catch, age determination, growth curves, fishing mortality, longevity, Chelidonichthys cuculus, Trigla lyra

Abstract

Gurnards are a valuable by-catch of mixed demersal fisheries and are commercially important in European waters, but they are often discarded, reported under “mixed gurnards” and with incomplete biological information by species. In the present work, a total of 558 piper gurnard specimens of between 10.9 and 44.4 cm (1 to 11 years) and 425 red gurnard specimens of between 10.2 and 42.1 cm (0 to 9 years) from the northeast Atlantic (Portuguese) coast were used to study age and growth. The von Bertalanffy growth parameters for piper gurnard were estimated through the combination of whole-otolith readings and back-calculation (L_∞=44.7 cm, k=0.16 yr^–1 and t₀=–2.781 yr). For red gurnard the same growth parameters were estimated using whole-otolith readings (L_∞=40.2 cm, k=0.28 yr^–1 and t₀=–1.074 yr). The results indicate that the red gurnard reaches a smaller length, although it grows faster than the piper gurnard. Natural, instantaneous and fishing mortalities were estimated as well as the exploitation rate for both species. For the Portuguese coast, the red gurnard showed a higher fishing mortality and exploitation rate than the piper gurnard, raising concerns about its sustainable management.

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