Prospective study of the fishery of the shrimp Plesionika narval (Fabricius, 1787) in the Northeastern Atlantic

Abstract

Several experimental surveys were carried out in the Northeastern Atlantic, Madeira archipelago from 1991 to 2008 to explore new fisheries resources. This study examined the selectivity of bottom and floating traps and the analysis of yield-per-recruit (YPR) and biomass-per-recruit (BPR) providing helpful insight to the management of the shrimp Plesionika narval. A total of 28,262 specimens were sampled and the analysis of length at first capture returned higher values when using floating traps indicating that these traps are more selective, exerting less pressure on the resource. The YPR and BPR analysis showed that the stock is under exploited for the studied area and suggests that the use of floating traps in the commercial fisheries of P. narval is recommended, which will allow a higher maximum allowable limit of exploitation and greater yield. The results suggest that P. narval has the potential to support a viable and sustainable fishery using floating traps.Keywords: Plesionika narval, selectivity, sustainable yield, bottom traps, floating traps. Estudo prospectivo da pesca do camarão

Abundance and population structure of Plesionika narval (Fabricius, 1787) in the Northeastern Atlantic

“…A total of 62 fishing sets were carried out on the insular shelves and slopes off the archipelago of Madeira, Eastern Central Atlantic (32°00'-33°30'N; 15°30'-18°00'W) in research surveys using bottom floating traps according to Sousa et al (2017), over a period of 4 years, from 2004 to 2008.…”

Shrimp trap selectivity in a Mediterranean small-scale-fishery

“…Selectivity has been investigated taking into account the likelihood of an individual encountering a trap, entering trap, escape through the entrance, or escape through another part of the trap. As such, selectivity of these traps are dependent on a number of factors, including time and area of trap deployment, shape and design of the trap, type of entrance, type of bait, presence of escape panels and quite importantly, the shape and size of the mesh (Brown, 1982;Salthaug and Furevik, 2004;Tallack, 2007;Jirapunpipat et al, 2008;Favaro et al, 2010;Winger and Walsh, 2011;Broadhurst et al, 2014;Sousa et al, 2017).…”

“…The narwal shrimp (Plesionika narval) (Fabricius, 1787) is a nektobenthic cosmopolitan species occurring from the surface down to 910 m depth in a large variety of habitats including muddy, sand-muddy, rocky bottoms and submarine caves (Holthuis, 1987;Thessalou-Legaki et al, 1989;Biscoito, 1993). In both the North-Eastern Atlantic and the Central Mediterranean Sea, ovigerous individuals have been found to occur all year round indicating a prolonged spawning period (Arculeo and Lo Brutto, 2011;Sousa et al, 2014;Anastasopoulou et al, 2017;Triay-Portella et al, 2017). In the Aegean Sea, catches of the narwal shrimp have been shown to vary both with depth and season, together with a vertical migration of females to shallower waters during the period of thermal stratification (Kalogirou et al, 2017).…”

Weight-length relationships of six shrimp species caught off the Madeira Archipelago, Northeastern Atlantic

“…A more detailed description of the survey's design, fishing and sampling methodologies is available in Biscoito et al (1992) and Sousa et al (2016).…”