Life history parameters of the round sardinella Sardinella aurita in the Central East Atlantic off north-west Africa
- 1 February 2020
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of the Marine Biological Association of the United Kingdom
- Vol. 100 (6), 997-1009
- https://doi.org/10.1017/s002531542000079x
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
This publication has 53 references indexed in Scilit:
- On the biology of gilt sardine Sardinella aurita (Clupeidae) of the central Eastern AtlanticJournal of Ichthyology, 2006
- Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendationsJournal of Applied Ichthyology, 2006
- Bycatch and release of pelagic megafauna in industrial trawler fisheries off Northwest AfricaFisheries Research, 2006
- An investigation of seasonal and annual catches and discards of the Dutch pelagic freezer-trawlers in Mauritania, Northwest AfricaFisheries Research, 2006
- EXTINCTION RISK OF HETEROGENEOUS POPULATIONSEcology, 2005
- The effects of four preservation methods on length, weight and condition factor of the clupeid Sardinella aurita Val. 1847Journal of Applied Ichthyology, 2003
- Coastal upwelling and associated retention indices derived from satellite SST. Application to Octopus vulgaris recruitmentOceanologica Acta, 2000
- On ‘variability’ as a sampling artefact: the case of Sardinella in north‐western AfricaFish and Fisheries, 2000
- Stratégies spatio-temporelles de la reproduction des clupéidés des zones d'upwelling d'Afrique de l'OuestAquatic Living Resources, 1989
- Temperature, Growth, and Mortality - The Pacific CockleICES Journal of Marine Science, 1960