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Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa

Published online by Cambridge University Press:  10 September 2020

Alba Jurado-Ruzafa Open the ORCID record for Alba Jurado-Ruzafa [Opens in a new window] ,
Eva Hernández ,
Verónica Duque-Nogal ,
Pedro J. Pascual-Alayón ,
M. Nazaret Carrasco ,
Alejandro Sancho  and
M. Teresa G. Santamaría
Alba Jurado-Ruzafa*
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
Eva Hernández
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
Verónica Duque-Nogal
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
Pedro J. Pascual-Alayón
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
M. Nazaret Carrasco
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
Alejandro Sancho
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
M. Teresa G. Santamaría
Affiliation:
Centro Oceanográfico de Canarias, Instituto Español de Oceanografía, Dársena Pesquera, Santa Cruz de Tenerife38180, Spain
*
Author for correspondence: Alba Jurado-Ruzafa, E-mail: alba.jurado@ieo.es
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Abstract

Sardinella aurita has become an important source of fish protein-intake in NW African countries, where one stock is considered from Morocco to south Senegal, performing seasonal reproductive migrations along the coast. Although data are limited for the fisheries involved and for life-history knowledge of the species in the area, a precautionary approach is recommended to avoid overexploitation. Commercial landings of round sardinella produced by the European freezer-pelagic trawlers operating in Mauritanian waters were analysed between May 2004 and February 2012. The length-weight relationships (LWRs) (N = 40,725) did not show significant differences between sexes. Ripening round sardinellas were present throughout the year, but spawning effort rose between June and December. The length at first maturity for males and females was estimated at 27.7 cm TL (2.1 years) and 28.1 cm TL (2.2 years), respectively. Ages were interpreted from otoliths, varying from 0 to 8 years. Von Bertalanffy growth parameters resulted in non-statistically significant differences between sexes (P = 0.28). Natural mortality was estimated at ~0.63 year–1. The results provide important biological information for fisheries assessment of a species that plays an important key role in the current climate change scenario and for the economies of the riparian countries.

Keywords

Atlantic Oceangrowthlength-weight relationships (LWRs)natural mortalityreproductionSardinella auritasmall pelagic fish
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 100 , Issue 6 , September 2020 , pp. 997 - 1009
Copyright
Copyright © Marine Biological Association of the United Kingdom 2020

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