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.
Highlights
Plesionika narval (Fabricius, 1787) is a cosmopolitan species occurring from the surface down to 910 m of depth in a large variety of habitats including muddy, sand-muddy, rocky bottoms and submarine caves (Biscoito, 1993; Holthuis, 1987)
The aim of this work is to determine the potential effects of the fishery on exploited stocks of P. narval according to the fishing gear used through the yield-per-recruit and biomass-per-recruit models by the analysis of the status of the stock of P. narval in the archipelago of Madeira (Northeastern Atlantic)
Females caught in floating traps showed carapace length (CL) minimum and maximum of 6.72 and 28.61 mm (CL= 18.24 ± 1.99) and of 7.00 and 22.00 mm (CL= 13.54 ± 2.55) using bottom traps
Summary
Plesionika narval (Fabricius, 1787) is a cosmopolitan species occurring from the surface down to 910 m of depth in a large variety of habitats including muddy, sand-muddy, rocky bottoms and submarine caves (Biscoito, 1993; Holthuis, 1987). This species is acknowledged by FAO as a species of interest to fisheries (Holthuis, 1980), since it occurs in great abundance and is captured in bottom trawls and traps (Biscoito, 1993; Holthuis, 1987). It is well-established that the selectivity and efficiency of crustacean traps are influenced by innumerous factors, such as: spatial and temporal deployments (Grubert and Lee, 2013) general design and/or shape (Butcher et al, 2012) number and/or type of entrances (Vazquez Archdale et al, 2006); bait type (Vazquez Archdale et al, 2008), size (Vazquez Archdale et al, 2006) and shape of meshes (Guillory and Hein, 1998)
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