The use of fishers’ Local Ecological Knowledge to reconstruct fish behavioural traits and fishers’ perception of conservation relevance of elasmobranchs in the Mediterranean Sea
Matteo Barbato, Claudio Barría, Andrea Bellodi, Sara Bonanomi, Diego Borme, Ilija Ćetković, Francesco Colloca, Ana I. Colmenero, Fabio Crocetta, Francesco De Carlo, EGEMEN DEMİR, Manfredi Di Lorenzo, Maria Cristina Follesa, Fulvio Garibaldi, Gianni Giglio, Ioannis Giovos, Giulia Guerriero, Olfa Hentati, Mohamed Ksibi, Claudia Kruschel, Luca Lanteri, Francesco Luigi Leonetti, Alessandro Ligas, Adriano Madonna, Sanja Matić‐Skoko, RENATA MIMICA, Dimitrios K. Moutopoulos, Antonello Mulas, Vedrana Nerlović, Ana Pešić, Maria Cristina Porcu, Emilio Riginella, Emilio Sperone, KONSTANTINOS TSOUKNIDAS, Sezginer Tunçer, Dario Vrdoljak, Carlotta Mazzoldi
Abstract
The Mediterranean Sea has a long-lasting history of fishery exploitation that, together with other anthropogenic impacts, has led to declines in several marine organisms. In particular, elasmobranch populations have been severely impacted, with drastic decreases in abundance and species diversity. Based on their experience, fishers can provide information on marine species occurrence, abundance and behavioural traits on a long-term scale, therefore contributing to research on the poorly studied biological aspects of elusive or rare elasmobranch species. In this study, for the first time, the use of the Local Ecological Knowledge (LEK) of fishers was applied to study the behavioural traits of sharks, rays and skates in 12 FAO-GFCM geographical sub-areas (GSAs) of the Mediterranean Sea. This study found both new insight and proved the reliability of LEK-based catch seasonality, reflecting seasonal movements, by comparing LEK-based findings and available literature on five elasmobranch taxa (Mustelus spp., Squalus acanthias, Raja spp., Myliobatis aquila and Scyliorhinus stellaris) in the Adriatic Sea and 7 taxa (Mustelus spp., Raja spp., Prionace glauca, Scyliorhinus canicula, Torpedo spp., Pteroplatytrygon violacea and Isurus oxyrinchus) in the remaining Mediterranean GSAs. In addition, LEK provided new insights into a novel comprehensive representation of species aggregations (Mustelus spp., S. acanthias, M. aquila and S. canicula) in the sampled GSAs and supplied the first descriptions of the size, number of individuals and sex composition of the aggregations. When the limits and shortcomings of LEK-based research are considered, this methodology can be a complementary and cost-effective tool used to study elasmobranchs in either a data-poor scenario or a scenario in which a baseline is missing. LEK can also be useful for the evaluation and inclusion of fishers’ perceptions on bottom-up management and to provide important evidence for conservation plans.