February 1st to 5th 2016
Olhão, Portugal
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Barrier trap selectivity improvement for the management of coastal lagoons: Case study from an Eastern Mediterranean lagoon

Scientific Exhibition
Natural Resources
Wednesday, February 3, 2016 -
18:30 to 20:00

Moutopoulos, D.K. 1 Dimitriou, E. 2 Dimitriou, N. 3 Katselis, G. 4 Mantzouni, I. 5 Spala, K. 6 Koutsikopoulos, C. 7

1Department of Fisheries-Aquaculture Technology, Technological Education Institute of Western Greece, Mesolonghi, Greece
2Prefecture of Aitoloakarnania, Messolonghi, Greece
3Aquaaction l.p., Agrilia, Messolonghi, Greece
4Department of Fisheries-Aquaculture Technology, Technological Education Institute of Western Greece, Mesolonghi, Greece
5University of Patras, Department of Biology, Rio-Patras, Greece
6University of Patras, Department of Biology, Rio-Patras, Greece
7University of Patras, Department of Biology, Rio-Patras, Greece

Lagoons have been emphasized for their importance as nurseries grounds for different marine species, which in turn supports significant abundances of undersized individuals that can be harvested by fishing, thus causing more intensive discarding problems. This becomes particularly critical because the current European Regulation 1967/2006 has been incorporates in its issues the lagoons, as they are properly considered as part of the coastal zone of the Mediterranean. Especially on chapter 5 reports for the minimum marketing sizes of marine organisms. In this respect an initiative aiming to improve fisheries management in the Messolonghi-Etoliko lagoon complex (Western Greece) is presented. The main goal is to evaluate whether the installation of modified fish barrier traps has resulted in reducing the catches of undersized individuals and thus the resulting discards. So, small - scale modifications in the technical characteristics of the fish barrier traps were planned by the prefectural fisheries department of the area accompanied by the active participation of the professional fishermen cooperation’s under scientific monitoring. The new type of barrier traps lead both to a reduction of small sized individuals and to an increase of the larger ones in the catch. Especially, it allows a significant escapement of undersized fish leading to a reduction of discards in the area. Differences in species size selectivity between the traditional and the new type of barrier traps were found for all studied species. Regarding the most abundant species of the study, Sparus aurata, the total commercial value was found higher for the catch derived from new traps in comparison to the old type. This leads to economic benefit by almost 20% and on the boost of commercialization of the product. The results will be also discussed in the context to improve the sustainability of lagoon multi-species and multi-gear fisheries.
keywords: 
lagoon, fisheries, seabream, traps, discards, Mediterranean Sea

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