Species and size selectivity in a Portuguese multispecies artisanal long-line fishery

Erzini, Karim; Gonçalves, Jorge M. S.; Bentes, Luís; Lino, Pedro G.; Cruz, João

doi:10.1006/jmsc.1996.0102

Cited by 78 publications

(86 citation statements)

References 8 publications

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“…We found a slight increase in the mean TL of Spotted Rose Snapper caught on #6 hooks over those caught on #10 hooks; however, the mean TL of those caught on #8 hooks did not differ significantly from those caught on #10 or #6 hooks. Hook selectivity is affected by both the degree of difference in hook size and the size of the fish species (Erzini et al 1996). We found evidence of hook selectivity with a 116% increase in hook size (over the smallest hook), but no selectivity associated with a 41% increase.…”

Section: Discussionmentioning

confidence: 56%

“…Ralston (1982) found no evidence of hook selectivity with a maximum increase in hook size of 71%. Erzini et al (1996Erzini et al ( , 1998 had mixed results with hooks of a similar size distribution (increases of 1.49 and 2.09 times), reporting evidence of selectivity among some of the larger species in the studies. While increases of over 200% are often required to determine hook selectivity in small species (Erzini et al 1996), Otway and Craig (1993) found that the catch of undersized Australasian Snapper could be reduced with only a 65% increase in hook size.…”

Section: Discussionmentioning

confidence: 89%

“…Erzini et al (1996Erzini et al ( , 1998 had mixed results with hooks of a similar size distribution (increases of 1.49 and 2.09 times), reporting evidence of selectivity among some of the larger species in the studies. While increases of over 200% are often required to determine hook selectivity in small species (Erzini et al 1996), Otway and Craig (1993) found that the catch of undersized Australasian Snapper could be reduced with only a 65% increase in hook size. Many studies have found an inverse relationship between catch rates and hook size (Otway and Craig 1993;Erzini et al 1996Erzini et al , 1998Alós et al 2008a), as was the case with our findings.…”

Section: Discussionmentioning

confidence: 89%

“…While increases of over 200% are often required to determine hook selectivity in small species (Erzini et al 1996), Otway and Craig (1993) found that the catch of undersized Australasian Snapper could be reduced with only a 65% increase in hook size. Many studies have found an inverse relationship between catch rates and hook size (Otway and Craig 1993;Erzini et al 1996Erzini et al , 1998Alós et al 2008a), as was the case with our findings. Erzini et al (1996) suggest that higher catch rates are the result of the smaller hooks' ability to catch more small-mouthed invertebrate feeders.…”

Section: Discussionmentioning

confidence: 99%

“…Increasing the hook size used in a fishery can exclude undersized fish (Alós et al 2008a(Alós et al , 2008bOtway and Craig 1993) as well as decrease the catch rate of nontarget species (Otway and Craig 1993;Erzini et al 1996Erzini et al , 1998Alós et al 2008aAlós et al , 2008b. In a study of the Australasian Snapper Pagrus auratus, Otway and Craig (1993) found that increasing hook size from a #12 to a #10 Mustad tuna hook reduced the catch of illegal (<250-mm) fish by 50% without impacting the catch of legal (≥250-mm) fish.…”

mentioning

confidence: 99%

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Hook Selectivity in an Artisanal Spotted Rose Snapper Lutjanus guttatus Fishery on the Nicoya Peninsula, Costa Rica

Mongeon

Granek

Arauz³

2013

Mar Coast Fish

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Commercial fishing is responsible for declines in both the abundance and biomass of many marine species (Ward and Myers 2005). The Marine Stewardship Council's (MSC) Sustainable Seafood Certification Program focuses on fishery modifications to reduce such impacts on marine species and ecosystems. On the Nicoya Peninsula in northwestern Costa Rica, the Costa Rican nongovernmental organization Programa Restauración de Tortugas Marinas has been working with artisanal fishers since 2007 to promote sustainable fishing practices, with the goal of applying for a sustainable fishery certificate from the MSC. To collect relevant data for the MSC application, we tested the selectivity of the hooks used in the artisanal fishery to determine how the fishery interacts with the target species, the Spotted Rose Snapper Lutjanus guttatus, as well as nontarget, bycatch species. We constructed a longline composed of equal numbers of different sized hooks (the Mustad #8 “J” style hooks commonly used in the fishery as well as smaller #10 and larger #6 hooks). Decreasing the hook size led to higher catch rates of both Spotted Rose Snapper and most bycatch species, with no change in mean size of Spotted Rose Snapper. Increasing the hook size led to decreased catch rates of both Spotted Rose Snapper and most bycatch species and an increase in the mean size of Spotted Rose Snapper. The size range of the Spotted Rose Snapper caught on this gear did not exceed that of the artisanal fishery. This study suggests that the artisanal fishery is using an appropriately sized hook to minimize bycatch rates without unduly minimizing the catch rates of the target species, though increasing hook size could exclude the smallest Spotted Rose Snapper from the fishery. Received November 27, 2012; accepted May 21, 2013

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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Hook Selectivity in an Artisanal Spotted Rose Snapper Lutjanus guttatus Fishery on the Nicoya Peninsula, Costa Rica

Mongeon

Granek

Arauz³

2013

Mar Coast Fish

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Effect of Hook and Bait Size on Catch Efficiency in the Persian Gulf Recreational Fisheries

Herrmann¹,

Eighani

Paighambari

et al. 2018

Mar Coast Fish

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The effect of hook and bait sizes on the catch efficiency and size composition of Spangled Emperor Lethrinus nebulosus, Orange-spotted Grouper Epinephelus coioides, and Narrowbarred Mackerel Scomberomorus commerson was investigated in the recreational and semi-subsistence handline fishery in the Persian Gulf. Based on expectations that increasing hook and bait sizes would decrease the catch efficiency of the smaller individuals while maintaining the catch efficiency of larger fish, we investigated the effect of increasing hook and bait sizes. For all three species, the results indicated slightly lower catch efficiency for the smaller fish when larger hooks were used. Furthermore, the results demonstrated a significant increase in catch efficiency for the larger sizes of Spangled Emperor and Orange-spotted Grouper when fished with larger hooks, an effect that increased with fish size for both species. Additionally, the overall catch efficiency did not vary significantly when increasing hook and bait sizes for the three species investigated. This study shows that fishing with larger hooks and larger bait would change the exploitation pattern of these species toward higher proportions of larger fish in the catches. Moreover, based on the size distribution of the species on the fishing grounds during the study period, the use of larger hooks and bait would lead to significant increases in the total number of Spangled Emperor caught (41% increase; 95% confidence interval [CI] = 17-69%) and the total number of Orange-spotted Grouper caught (151% increase; 95% CI = 132-336%), respectively. The results indicated a similar effect for Narrowbarred Mackerel; however, the effect was far less profound than for the two other species and was not significant for any size-classes.

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Assessing the Relative Selectivity of Multiple Sampling Gears for Managed Reef Fishes in the Eastern Gulf of Mexico

et al. 2020

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Fishery-independent data are important for the effective management of reef fishes in the eastern Gulf of Mexico. Proper characterization of selectivity, or the effectiveness of each type of sampling gear in capturing a species or a size-class, is essential to ensure that assessment models treat various sources of data appropriately. In this study, we analyzed fishery-independent data that was collected using stereo-baited remote underwater video (S-BRUV) arrays, chevron traps (TRAP), and two types of hooked gear (repetitive timed-drop [RTD] and vertical longline [VLL]) to assess gear-related differences of species composition and size selectivity of managed reef fishes in the eastern Gulf of Mexico. Significant differences were detected in the assemblage structures of reef fishes in relation to region, gear type, and depth. Overall, eight managed species were identified as contributing to the top 70% of the assemblage structure for each gear type. Stereo-baited remote underwater video had the highest abundances for most of the species and the highest number of species captured, while VLL had the lowest. Two economically and ecologically important species (Red Grouper Epinephelus morio and Red Snapper Lutjanus campechanus) were common to all four gear types, and the size selectivity of these two species generally overlapped. However, significant differences among gear types were detected. Unimodal selection curves for hooked gears indicated that size of Red Snapper and Red Grouper increased as hook size increased. These data provide insight on species and size selectivity of multiple gears, which will contribute to future survey design and aid in the management of reef-fish populations.

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Species and size selectivity in a Portuguese multispecies artisanal long-line fishery

Cited by 78 publications

References 8 publications

Hook Selectivity in an Artisanal Spotted Rose Snapper Lutjanus guttatus Fishery on the Nicoya Peninsula, Costa Rica

Hook Selectivity in an Artisanal Spotted Rose Snapper Lutjanus guttatus Fishery on the Nicoya Peninsula, Costa Rica

Effect of Hook and Bait Size on Catch Efficiency in the Persian Gulf Recreational Fisheries

Assessing the Relative Selectivity of Multiple Sampling Gears for Managed Reef Fishes in the Eastern Gulf of Mexico

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