Marine debris in bottom trawl catches and their effects on the selectivity grids in the north eastern Mediterranean

Eryaşar, Ahmet Raif; Özbilgin, Hüseyin; Gücü, Ali Cemal; Sakınan, Serdar

doi:10.1016/j.marpolbul.2014.02.017

Cited by 52 publications

(12 citation statements)

References 12 publications

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“…An increase in the amount of debris in the marine environment and its impact on fisheries is of growing concern. In the study area, Güven, Gülyavuz, and Deval (2013) reported that the mass of overall debris concentration in Antalya Bay ranged from 18.5 to 2186 kg/km 2 , and the quantity of debris from 115 to 2762 item/km 2 between 200 m and 800 m. Eryaşar, Özbilgin, Gücü, and Sakman (2014) showed in the Levant Sea that plastic items were the most abundant debris (73% in terms of weight) and highly probable that plastics could block 85% of the sorting grids intended to improve trawl selection in the trawl WM, western-; CM, central-; EM, eastern Mediterranean; MM, mesh material; MSh, mesh shape (DM, diamond-; SM, square mesh); MS, mesh size; SaM, sampling method (CC, covered codend without hoops; HCC, hooped-covered codend); EsM, method for estimation of selectivity (FM, Fryer's; PD, pooled data; L, logistic); L 50 , mean value of retention length at 50% (L 50 ); SR, selection range. a In TL.…”

Section: Discussionmentioning

confidence: 94%

“…An increase in the amount of debris in the marine environment and its impact on fisheries is of growing concern. In the study area, Güven, Gülyavuz, and Deval () reported that the mass of overall debris concentration in Antalya Bay ranged from 18.5 to 2186 kg/km 2 , and the quantity of debris from 115 to 2762 item/km 2 between 200 m and 800 m. Eryaşar, Özbilgin, Gücü, and Sakman () showed in the Levant Sea that plastic items were the most abundant debris (73% in terms of weight) and highly probable that plastics could block 85% of the sorting grids intended to improve trawl selection in the trawl hauls. Somerton, Wenberg, and Goodman () reported that significant amounts of debris in the codend increased the drag and caused a decrease in the trawl net spread, in turn, potentially changing the footrope contact and selectivity.…”

Section: Discussionmentioning

confidence: 94%

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Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean

2016

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Summary The study compared the selectivity of 50 mm mesh size conventional (T0) and 90° turned mesh (T90) demersal trawl codends for four commercial shrimp species (Aristaeomorpha foliacea, Aristeus antennatus, Parapenaeus longirostris and Plesionika martia) in the Bay of Antalya in the eastern Mediterranean. Data were collected from 27 valid hauls using the covered codend method. Selectivity parameters were obtained using the logistic equation with the maximum likelihood method and by taking into account the between‐haul variations. Results show that changing the codends from T0 to T90 increases the percentage of escapees for all four targeted shrimp species. According to species, a change in the mesh configuration significantly increases L50 by 7–14%. However, for the two commercially important red shrimp species (Aristaeomorpha foliacea and Aristeus antennatus), even the L50 values obtained in the T90 codend (23.3 mm) remain rather low for the release of sufficient numbers of immature specimens. First maturity sizes (FMS) for these two species are 38 and 30 mm, respectively; therefore, for their sustainable exploitation, additional management measures must be investigated including larger mesh sizes.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 94%

Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean

2016

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“…[42][43][44][45][46][47][48] Regions of low topography, such as submarine canyons are oen the sites of plastics deposition, although the distribution of plastics may also be controlled by ridges or ledges that are optimal for trapping debris. [42][43][44][45][46][47][48] Regions of low topography, such as submarine canyons are oen the sites of plastics deposition, although the distribution of plastics may also be controlled by ridges or ledges that are optimal for trapping debris.…”

Section: Submerged Plastics In Marine Watermentioning

confidence: 99%

Benthic plastic debris in marine and fresh water environments

Corcoran

2015

Environ. Sci.: Processes Impacts

117

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This review provides a discussion of the published literature concerning benthic plastic debris in ocean, sea, lake, estuary and river bottoms throughout the world. Although numerous investigations of shoreline, surface and near-surface plastic debris provide important information on plastic types, distribution, accumulation, and degradation, studies of submerged plastic debris have been sporadic in the past and have become more prominent only recently. The distribution of benthic debris is controlled mainly by combinations of urban proximity and its association with fishing-related activities, geomorphology, hydrological conditions, and river input. High density plastics, biofouled products, polymers with mineral fillers or adsorbed minerals, and plastic-metal composites all have the potential to sink. Once deposited on the bottoms of water basins and channels, plastics are shielded from UV light, thus slowing the degradation process significantly. Investigations of the interactions between benthic plastic debris and bottom-dwelling organisms will help shed light on the potential dangers of submerged plastic litter.

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“…Results from bottom trawl catches report high shares of transboundary litter in the region (Eryaşar et al 2014;Yılmaz et al 2002;Bingel et al 1987). Similarly high numbers cannot be reported for the coast.…”

Section: Discussionmentioning

confidence: 99%

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Aydin¹,

Güven²,

Salihoğlu³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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The Cilician Basin located in the Northeastern Mediterranean is a region that is affected by a diversity of anthropogenic pressures and is further expected to suffer from negative economic, environmental and social impacts of coastal litter. To provide a baseline for litter management plans, the standing crop of coastal macro-litter was sampled on 13 beaches following MSFD guidelines. Environmental predictors characterizing beach use and potential land based litter point sources in the vicinity of the beaches were related to litter densities to identify litter sources. The average litter density was 0.92 ± 0.36 items/m 2 . Litter items resulting from convenience food consumption and smoking made up more than half of the total litter collected, while agricultural, industrial, fishing activities together contributed only 6% of the total number of items. Plastic items on average constituted more than 80% of the dominant material type. Percentages of the litter transported with currents from neighbouring countries (transboundary litter) varied from 0 -4.23% between beaches. Direct deposition on the beaches was identified as the main method for transport of items to the coastal environment. Our results show poor local awareness and underline the need for educational programs that can help reduce coastal litter.

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Marine debris in bottom trawl catches and their effects on the selectivity grids in the north eastern Mediterranean

Cited by 52 publications

References 12 publications

Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean

Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean

Benthic plastic debris in marine and fresh water environments

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