Assessing the relevance of sharks and rays for Mediterranean EU fisheries to support a transition from species exploitation to species conservation

Author:

Colloca Francesco1,Arcioni Martina1,Acampa Francesca1,Valente Salvatore1,Ventura Daniele2,Lorenzo Manfredi Di1,Milisenda Giacomo1,Moro Stefano1

Affiliation:

1. Stazione Zoologica Anton Dohrn

2. Sapienza University of Rome

Abstract

Abstract

Ten years (2013–2022) of official data on elasmobranchs landed and discarded by European fishing fleets operating in the Mediterranean Sea were analysed with the primary objective of assessing the significance of shark and ray catches for the main fleet segments across five Mediterranean regions (i.e. Western, Central and Eastern Mediterranean, Ionian Sea, Adriatic Sea). The annual elasmobranch catches ranged from 3,200 to 5,800 tons, declining consistently from 2020 to 2022. Four fishing gears (i.e. bottom trawls, longlines, trammel nets, and gillnets) contributed over 96.6% of the reported catch, with notable variations among regions. Bottom trawlers accounted for approximately 75% of catches, discarding around 40%; fixed nets and longlines had minimal discard rates (< 2.5%). The Western Mediterranean contributed the most to total catches (2,057 − 3,229 tons/year), followed by the Adriatic Sea. Generalized Additive Models revealed a significant correlation between catches and fishing effort, indicating increasing catches at high fishing effort levels. Reported landings included species absent in the Mediterranean and considered rare or extremely rare in the basin, highlighting the need for better species reporting. The average contribution of sharks and rays to the total annual landings of Mediterranean fleets was 1.66% in weight and 0.60% in value, totaling approximately 96.4 million euros over the decade, compared to the overall value of 15.8 billion euros for the whole landing. As elasmobranchs no longer represent a substantial revenue stream for Mediterranean fleets, implementing conservation measures to restore depleted shark and ray populations will likely have minimal impact on the economic sustainability of fisheries.

Publisher

Springer Science and Business Media LLC

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