Can a large-mesh sieve panel replace or supplement the Nordmøre grid for bycatch mitigation in the northeast Atlantic deep-water shrimp fishery?

Jacques, Nadine; Herrmann, Bent; Larsen, Roger B.; Sistiaga, Manu Berrondo; Brčić, Jure; Gökçe, Gökhan; Brinkhof, Jesse

doi:10.1016/j.fishres.2019.105324

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Therefore, the results obtained for shrimp grid passage probability in this study should be interpreted keeping in mind that in areas with larger shrimp than those caught in our study, there could potentially be differences in passage probability for the largest individuals. However, the size structure of Northern shrimp and the bycatch composition obtained in this study is similar to those obtained in several earlier experiments that have been carried out in the Barents Sea during the last two decades [10,16,[21][22][23][24][25]45]. This shows that there is likely little variation in the shrimp population size structure in the Barents Sea.…”

Section: Plos Onesupporting

confidence: 89%

“…Further, the retention probability curves for the combined effect of the grid and codend did not show significant differences between the three different grid and codend configurations considered ( Fig 5D–5F ). Northern shrimp have limited swimming capability and, therefore, they are able to pass through the grid if they contact the device with optimal orientation [ 23 ]. The results of this study show that the grid passage probability estimated for shrimp is close to 100% for the 17, 19 and 21 mm grid ( Table 2 ).…”

Section: Discussionmentioning

confidence: 99%

“…Due to increased focus on discard reduction in fisheries [17], the efforts to improve both species and size selectivity in Northern shrimp fisheries in general (e.g., [9,[18][19][20]) and in the Barents Sea in particular (e.g., [21][22][23]) have incremented in the last decade. Many of these studies have looked on changes in the grid section design that could potentially lead to better selective properties of the grid (e.g., [24,25]).…”

Section: Plos Onementioning

confidence: 99%

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Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery

et al. 2022

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The introduction of the Nordmøre grid in shrimp trawls has reduced the bycatch of non-target species. In the Norwegian Northern shrimp (Pandalus borealis) fishery, the mandatory selective gear consists of a Nordmøre grid with 19 mm bar spacing combined with a 35 mm mesh size diamond mesh codend. However, fish bycatch in shrimp trawls remains a challenge and further modifications of the gear that can improve selectivity are still sought. Therefore, this study estimated and compared the size selectivity of Nordmøre grids with bar spacings of 17 and 21 mm. Further, the effect of applying these two grids on trawl size selectivity was predicted and compared to the legislated gear configuration. Experimental fishing trials were conducted in the Barents Sea where the bottom trawl fleet targets Northern shrimp. Results were obtained for the target species and two by-catch species: cod (Gadus morhua) and American plaice (Hippoglossoides platessoides). This study demonstrated that reducing bar spacing can significantly reduce fish bycatch while only marginally affecting catch efficiency of Northern shrimp. This is a potentially important finding from a management perspective that could be applicable to other shrimp fisheries where flexibility in the use of different grid bar spacings may be beneficial to maximize the reduction of unwanted bycatch while minimizing the loss of target species.

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Section: Plos Onesupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

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Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery

et al. 2022

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“…Polar cod is one of the 21 commercially targeted species in the Barents Sea although its economic importance has been relatively low. In the last years, Russia was harvesting this species at very low levels (Popov and Zeller 2018;Wienerroither et al 2011) and nowadays it is not directly targeted (Aune et al 2021) although taken as by-catch in the shrimp fishery (Jacques et al 2019). However, in the light of climate change, the facilitated access to Arctic waters due to the ice retreat might lead to increased exploitation of polar cod, either as a target species or as bycatch in pelagic fisheries and bottom trawling (Christiansen et al 2014).…”

Section: Management Implicationsmentioning

confidence: 99%

Distinct genetic clustering in the weakly differentiated polar cod, Boreogadus saida Lepechin, 1774 from East Siberian Sea to Svalbard

et al. 2021

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The cold-adapted polar cod Boreogadus saida, a key species in Arctic ecosystems, is vulnerable to global warming and ice retreat. In this study, 1257 individuals sampled in 17 locations within the latitudinal range of 75–81°N from Svalbard to East Siberian Sea were genotyped with a dedicated suite of 116 single-nucleotide polymorphic loci (SNP). The overall pattern of isolation by distance (IBD) found was driven by the two easternmost samples (East Siberian Sea and Laptev Sea), whereas no differentiation was registered in the area between the Kara Sea and Svalbard. Eleven SNP under strong linkage disequilibrium, nine of which could be annotated to chromosome 2 in Atlantic cod, defined two genetic groups of distinct size, with the major cluster containing seven-fold larger number of individuals than the minor. No underlying geographic basis was evident, as both clusters were detected throughout all sampling sites in relatively similar proportions (i.e. individuals in the minor cluster ranging between 4 and 19% on the location basis). Similarly, females and males were also evenly distributed between clusters and age groups. A differentiation was, however, found regarding size at age: individuals belonging to the major cluster were significantly longer in the second year. This study contributes to increasing the population genetic knowledge of this species and suggests that an appropriate management should be ensured to safeguard its diversity.

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“…The 95% confidence intervals for Δ r L ( l , vL , ϑ ) and Δ r L+M ( l , vU , ϑ ) were obtained based on the bootstrap population results for r ( l , ϑ ), rm L ( l , vL , ϑ ) and rm L + M ( l , vU , ϑ ) in a similar way as described above for rm L ( l , vL , ϑ ) and rm L + M ( l , vU , ϑ ) [ 9 , 19 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries?

et al. 2021

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Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (Pandalus borealis) and dominant bycatch species at the point where the Nordmöre grid section is installed. This was achieved using a separator frame which split the net vertically into three compartments of equal entry size. Our results showed that shrimp predominately follow the lower part of the trawl belly, whereas species such as redfish (Sebastes spp.), cod (Gadus morhua), polar cod (Boreogadus saida) and American plaice (Hippoglossoides platessoides) preferred the mid-section in the aft of the trawl. Haddock (Melanogrammus aeglefinus) primarily entered through the upper section of the trawl belly. Using these results, we predict that a vertical separation device installed forward of a 19 mm Nordmöre grid combined with a 35 mm codend would result in a significant reduction in bycatch with only minor loss of shrimp.

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Can a large-mesh sieve panel replace or supplement the Nordmøre grid for bycatch mitigation in the northeast Atlantic deep-water shrimp fishery?

Cited by 7 publications

References 22 publications

Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery

Effect of the Nordmøre grid bar spacing on size selectivity, catch efficiency and bycatch of the Barents Sea Northern shrimp fishery

Distinct genetic clustering in the weakly differentiated polar cod, Boreogadus saida Lepechin, 1774 from East Siberian Sea to Svalbard

Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries?

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