Discards and impact associated with wedge clam fisheries in the Alboran Sea: composition, structure and spatio-temporal variability | Descarte e impacto asociado a la pesquería de la coquina (Donax trunculus, 1758) en el mar de Alborán: composición, estructura y variación espaciotemporal
2015
León-Duarte, E. (Estefanía) | Urra, J. (Javier) | Gallardo Roldán, H. (Helena) | Lozano-Fernández, M. (Matías) | Baro, J. (Jorge) | Rueda, J.L. (José Luis) | García-Jiménez, M.T. (María Teresa)
anglais. The present study describes the composition, structure and damage caused by mechanizeddredges on discarded species from the wedge clam (Donax trunculus Linnaeus 1758) fisheries in the AlboranSea. Discard samples were collected on board artisanal fishing vessels in 95 commercial hauls performed inFuengirola and Caleta de Vélez between March 2013 and March 2014. The collected fauna wascharacterized according to their abundance and biomass, and considering their damage type by using athree-level scale (no damage, intermediate damage and severe damage) defined for the different faunalgroups identified. Data was analysed for contrasting variations in the different areas and seasons. A total of87 species were identified, including Paguridae and Annelida. Molluscs were the best represented faunalgroup, followed by decapod crustaceans and echinoderms. Other groups did not usually exceed 1% of thetotal abundance and biomass such as fishes or sipunculids. Most discarded individuals displayed no damageafter their capture, promoting therefore a high survival rate. Among the dominant taxa, echinoderms andcrustaceans displayed the highest proportion of damaged individuals due to their fragile exoesqueletons,which make them to be highly vulnerable to the physical impact caused by mechanized dredges and thefurther processing on board.
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