How is artificial lighting affecting the catches in deep water rose shrimp trawl fishery of the Central Mediterranean Sea?

Geraci, Michele Luca; Colloca, Francesco; Maio, Federico Di; Falsone, Fabio; Fiorentino, Fabio; Scannella, Danilo; Gancitano, Vita; Vitale, Sergio

doi:10.1016/j.ocecoaman.2021.105970

Cited by 17 publications

(14 citation statements)

References 40 publications

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“…Discards are an integral part of most fishing operations since all gears catch species that are thrown back into the sea (Bellido et al, 2011;Roda et al, 2019). However, the discards involving marine organisms are not negligible and depict a waste of natural resources that impact negatively the marine ecosystem and become a worldwide problem for the sustainable management of marine fisheries (Kelleher 2005;Vitale et al, 2018;Sardo et al, 2020;Geraci et al, 2021a). Over the past few decades, several efforts by the European Commission (EC) have aimed to tackle fishery discard-related challenges/issues-for instance, the European Commission introduced the landing obligation in Art.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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Discards remain among the main negative impacts of fishing activities, and their reductions are strengthened by the European Common Fisheries Policy (European Regulation 1380/2013). Trammel net fisheries appear more sustainable compared with other fishing techniques, especially from an ecological viewpoint. Despite this, reports show that trammel net fisheries deliver discard quantities between 10% and 43% of the total catch biomass. To supplement existing information, this current work attempts to address the discard reduction using guarding net in the small-scale fisheries of Egadi Islands MPA (Western Sicily, Central Mediterranean Sea). To assess the reduction of unwanted catches, 48 experimental fishing trials were conducted within a 6-month period. The experimental fishing trial employed a trammel net made up of 20 panels alternated with two different net configurations. The control panels (CN) held a large outer (180 mm) and small inner (31.25 mm) meshes. The test panels (GN) with guarding net constituted a three-mesh-high (50-mm mesh size) net placed between trammel net panels and a lead line. A total of 3,310 individuals belonging to 106 taxa and nine phyla were caught. Crustaceans were the most abundant unwanted catches in the control panels, whereas bioconstructions occurred in the guarding net panels. The discard ratios of CN and GN panels were statistically different (t-value = –2.55; p< 0.05). The analysis of catch per unit effort showed higher catches of CN panels for both commercial and discard fractions (p< 0.05). Moreover, the guarding net panels caught the main discarded species at 20% lower compared with the control. The overall value of the catch at the CN panels (€ 3,366.90) was higher than the total income (€ 2,043.70) generated using the GN panels, which suggests a significant commercial loss of 40% (p< 0.05).

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Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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“…The use of lights at, or close to, the sea surface to attract and aggregate fishes and invertebrates, notably squid, at night has a long history in pelagic purse seine, squid, and other capture fisheries. However, lights are now deployed at greater depths, from 50 to 1000 m. These lights have commercial applications, such as deep-water bottom trawls for Mediterranean shrimp [26] and other trawl and trap fisheries (e.g., [27]). Such lighting can substantially increase catches but may also increase bycatch of undersized or immature individuals [26].…”

Section: Submerged Artificial Light Fisheriesmentioning

confidence: 99%

“…However, lights are now deployed at greater depths, from 50 to 1000 m. These lights have commercial applications, such as deep-water bottom trawls for Mediterranean shrimp [26] and other trawl and trap fisheries (e.g., [27]). Such lighting can substantially increase catches but may also increase bycatch of undersized or immature individuals [26]. By contrast, potential benefits include a reduction of bycatch in some contexts [28] and replacement of trawls with traps [27].…”

Section: Submerged Artificial Light Fisheriesmentioning

confidence: 99%

A global biological conservation horizon scan of issues for 2023

Sutherland

Bennett²,

Brotherton³

et al. 2023

Trends in Ecology & Evolution

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“…where n c and n t are the number of fish caught in each length class l in the control and test nets, respectively (e.g., Vitale et al, 2018a;Geraci et al, 2021a). The observed proportion of catch caught in the test gear of each selected species was modelled to obtain a catch comparison curve using generalised linear mixed models (GLMMs) with a binomial distribution, where hauls were included as random intercept, using the Laplace approximation, to remove the variance linked to the expected change in abundance/catchability of the investigated species during the days and timeframes (Holst and Revill, 2009).…”

Section: Size Structuresmentioning

confidence: 99%

“…To directly quantify the relative length-dependent gear catch efficiency of the test versus control net, the so-called 'catch ratio' (CR), that is, the ratio between the catch of the control and test trawl nets of a given length, l, was estimated (e.g., Melli et al, 2020;Lomeli et al, 2021;Geraci et al, 2021a). In particular, CR(l) was computed as:…”

Section: Size Structuresmentioning

confidence: 99%

Exploring the feasibility of technological transfers of two by-catch reduction devices in the crustacean bottom trawling of the central Mediterranean

et al. 2023

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IntroductionMost Mediterranean fish stocks are overexploited owing to high fishing efforts and poor exploitation patterns. Demersal trawl fisheries are considered the most impactful fishery type because of the high quantities of unwanted catch that is then routinely discarded at sea.MethodsIn the present study, two types of by-catch reduction devices (BRDs), that is a sorting grid (Grid-T45 40 mm) and a T90 50 mm codend, were compared to a typical commercial bottom trawl net (control) in terms of size structures and catch per unit effort to assess the effect of gear modification on the selectivity of crustacean fisheries in the central Mediterranean Sea. In particular, three randomly selected trawlers were involved in a paired hauls experiment fishing at the same time in the same fishing ground. Each trawler carried out four hauls per day during a 3-day campaign for a total of 36 hauls. The target species of the fishery is Parapenaeus longirostris (herein DPS), and the main commercial by-catch is Merluccius merluccius (herein HKE).ResultsThe results showed that the landing per unit effort (LPUE) of DPS was higher for Grid-T45 40 mm net, although it did not differ significantly from that of the control net. Conversely, the discard per unit effort (DPUE) of the control net was significantly higher than of both BRD configurations. For HKE, a slightly higher LPUE was recorded using the T90 50 mm codend compared to that of the control, but this result was not statistically significant. The lowest DPUE was found for the T90 50 mm codend, with significant differences compared to that of the control and Grid-T45 40 mm net. The catch comparison of the size structures analysed through generalised linear mixed models highlighted that the Grid-T45 40 mm net was more effective in catching adult DPS, whereas the T90 50 mm codend was more selective for adult HKE.DiscussionIn conclusion, although further studies should be carried out in future to test the performance of the BRDs in different areas and seasons, the investigated gear seems to be promising for reducing the catch of undersized individuals and contributing to mitigating the current overfishing of DPS and HKE.

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How is artificial lighting affecting the catches in deep water rose shrimp trawl fishery of the Central Mediterranean Sea?

Cited by 17 publications

References 40 publications

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

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

A global biological conservation horizon scan of issues for 2023

Exploring the feasibility of technological transfers of two by-catch reduction devices in the crustacean bottom trawling of the central Mediterranean

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