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Guarding net effects on landings and discards in Mediterranean trammel net fishery: Case analysis of Egadi Islands Marine Protected Area (Central Mediterranean Sea, Italy)

“…As trammel nets are one of the most commonly used gears in coastal waters worldwide (Goncalves et al, 2008;Gökcȩ et al, 2016), there have been some studies on discards (Purbayanto et al, 2001;Coelho et al, 2005;Martıńez-Baños and Maynou, 2018), but as with discard studies for most gears, the emphasis was on vertebrates and commercially valuable or protected species (Catanese et al, 2018;Brownell et al, 2019;Geraci et al, 2019;Swimmer et al, 2020;Buscaino et al, 2021). Nevertheless, ecologically important species such as habitat-builder species and invertebrates, species at risk, or small-sized individuals are also affected by discards, and such concerns regarding the ecological impact of trammel net fisheries on benthic communities within the coastal zone (Goncalves et al, 2008;Metin et al, 2009;Aydin et al, 2013;Gökcȩ et al, 2016) and the unwanted by-catch (according to the ICES, 2020 classification) of benthic species with no commercial interest-for instance, crustaceans (crabs and hermit crabs), echinoderms (starfish, sea urchins and sea cucumbers), and gastropods (Gökcȩ et al, 2016). Previous works have focused on trammel net modifications (hanging ratio, different materials used to construct trammel nets, and mesh size) and devices such as acoustic deterrents and artificial lights to improve the selectivity of the gear and to reduce the interaction with unwanted by-catch species (Aydin et al, 2011;Maccarrone et al, 2014;Martıńez-Baños and Maynou, 2018;Bruno et al, 2021).…”

“…Previous works have focused on trammel net modifications (hanging ratio, different materials used to construct trammel nets, and mesh size) and devices such as acoustic deterrents and artificial lights to improve the selectivity of the gear and to reduce the interaction with unwanted by-catch species (Aydin et al, 2011;Maccarrone et al, 2014;Martıńez-Baños and Maynou, 2018;Bruno et al, 2021). Other investigations have highlighted that adding a mono-cloth net with a larger mesh from 10 to 30 cm in height, called "guarding net", at the bottom of the trammel net could represent an efficient solution to reduce the amount of unwanted species in trammel net fisheries (Sartor et al, 2007;Metin et al, 2009;Aydin et al, 2013;Gökcȩ et al, 2016). To supplement the existing information, this current work attempts to address the discard reduction using a guarding net in the small-scale fisheries of Egadi Island MPA (Western Sicily, Central Mediterranean Sea).…”

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“…GodØy et al, 2003;Gray et al, 2005;Bettoli and Scholten, 2006;Shester and Micheli, 2011), in Turkey, bycatch and discard studies were in general related to trammel nets (e.g. Aksu, 2006;Gökçe and Metin, 2007;Akyol, 2008;Metin et al 2009). Only a limited number of studies (e.g.…”

The effects on target catch, bycatch and discard of using multifilament and monofilament sardon on the trammel nets in the Black Sea small scale fisheries

“…However, while using sardon, factors such as the number of mesh, mesh size, hanging ratio, material made from and rope thickness should be determined well, and consequently, it should be tried to increase the productivity of fishery. In similar studies (Gökçe 2004;Metin et al 2009;Özdemir and Erdem 2019), it has been reported that nets using sardon catch less undesired prey of shrimp, crabs, mantis shrimp (Squilla mantis, L.), and madya species than nets without sardon, and that the height of the sardon used is an important criterion for reducing bycatch. Likewise, Godoy et al (2003) and Kara et al (1991) reported that the norsel ropes and sardons net attached to the lead line of the net reduced the catching of bycatch species.…”