Effects of hook and bait in a tropical northeast Atlantic pelagic longline fishery: Part II—Target, bycatch and discard fishes

Fernandez‐Carvalho, Joana; Coelho, Rui; Santos, Miguel N.; Amorim, Sérgio

doi:10.1016/j.fishres.2014.11.009

Cited by 22 publications

(22 citation statements)

References 33 publications

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“…Three studies have provided estimates of AVM for members of the family Odontaspididae, ranging from 0% in demersal longline (Butcher et al , ; Gulak et al , ) to 41% in protective gillnets (Reid & Krogh, ). Crocodile shark Pseudocarcharias kamoharai (Matsubara 1936) is a by‐catch in offshore, pelagic longline fisheries, with a very broad range in reported AVM: 4·7–9·1% (Fernandez‐Carvalho et al , ), 13·3% (Coelho et al , ), 38·7% (Bromhead et al , ), 66·7% (Musyl et al , ) and as high as 91% (Afonso et al , ), although the latter study was based on a limited sample size.…”

Section: Taxonomic Overview Of Elasmobranch Discard Survivalmentioning

confidence: 99%

“…Furthermore, estimates of overall mortality in the latter study, using mark–recapture data from fishes at different categories of vitality, suggested mortality of 62%. Within commercial longline fisheries, although some studies have indicated AVM of 54–71% (Beerkircher et al , ; Coelho et al , ; Gallagher et al , 2014 a ; Fernandez‐Carvalho et al , ), higher estimates (AVM = 70–90% or more) have also been reported widely (Morgan & Burgess, ; Coelho et al , ; Bromhead et al , ; Butcher et al , ). Afonso et al () noted a higher mortality when Sphyrna spp.…”

Section: Taxonomic Overview Of Elasmobranch Discard Survivalmentioning

confidence: 99%

“…Several studies have highlighted that sharks caught with circle hooks may survive better than those caught with J-hooks (Carruthers et al, 2009;Afonso et al, 2011;Fernandez-Carvalho et al, 2015), although other studies examining catch rates and mortality of sharks with different longline configurations have indicated circle hooks may not have such a great benefit (Yokota et al, 2006;Afonso et al, 2012;Amorim et al, 2015). A meta-analysis of available data led Godin et al (2012) to conclude that circle hooks did not affect catch rates of sharks, but did reduce at-vessel mortality, because these hooks are more often hooked in the mouth or jaw and are less frequently ingested (gut-hooked).…”

Section: O N G L I N E F I S H E R I E Smentioning

confidence: 99%

“…exhibit a relatively high mortality, with c. 90% recovered dead from protective nets (Reid & Krogh, 1992) and reported AVM in gillnets of 60-66·7%, even where soak times are relatively short (Walker et al, 2005;Braccini et al, 2012). Varying levels of mortality in pelagic longline fisheries have been reported in a range of studies and, whilst a few studies have reported lower estimates of 18-40% AVM (Boggs, 1992;Musyl et al, 2011;Gilman et al, 2015), most studies have reported 48-68% AVM (Beerkircher et al, 2004;Coelho et al, 2011Coelho et al, , 2012Bromhead et al, 2012;Fernandez-Carvalho et al, 2015). The higher AVM (89%) reported by Afonso et al (2012) was based on a small sample size.…”

Section: O R E C T O L O B I F O R M E Smentioning

confidence: 99%

“…Several studies have reported AVM of 15-35% AVM for C. longimanus taken in longline fisheries (Boggs, 1992;Beerkircher et al, 2004;Bromhead et al, 2012;Coelho et al, 2012;Gallagher et al, 2014a;Fernandez-Carvalho et al, 2015), with those studies reporting either a higher or lower AVM (Poisson et al, 2010;Musyl et al, 2011;Afonso et al, 2012) being based on more limited sample sizes.…”

Section: O R E C T O L O B I F O R M E Smentioning

confidence: 99%

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A review of capture and post‐release mortality of elasmobranchs

Ellis

Phillips

Poisson

2016

Journal of Fish Biology

120

106

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There is a need to better understand the survivorship of discarded fishes, both for commercial stocks and species of conservation concern. Within European waters, the landing obligations that are currently being phased in as part of the European Union's reformed common fisheries policy means that an increasing number of fish stocks, with certain exceptions, should not be discarded unless it can be demonstrated that there is a high probability of survival. This study reviews the various approaches that have been used to examine the discard survival of elasmobranchs, both in terms of at-vessel mortality (AVM) and post-release mortality (PRM), with relevant findings summarized for both the main types of fishing gear used and by taxonomic group. Discard survival varies with a range of biological attributes (species, size, sex and mode of gill ventilation) as well as the range of factors associated with capture (e.g. gear type, soak time, catch mass and composition, handling practices and the degree of exposure to air and any associated change in ambient temperature). In general, demersal species with buccal-pump ventilation have a higher survival than obligate ram ventilators. Several studies have indicated that females may have a higher survival than males. Certain taxa (including hammerhead sharks Sphyrna spp. and thresher sharks Alopias spp.) may be particularly prone to higher rates of mortality when caught.

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Section: Taxonomic Overview Of Elasmobranch Discard Survivalmentioning

confidence: 99%

Section: Taxonomic Overview Of Elasmobranch Discard Survivalmentioning

confidence: 99%

Section: O N G L I N E F I S H E R I E Smentioning

confidence: 99%

Section: O R E C T O L O B I F O R M E Smentioning

confidence: 99%

Section: O R E C T O L O B I F O R M E Smentioning

confidence: 99%

See 3 more Smart Citations

A review of capture and post‐release mortality of elasmobranchs

Ellis

Phillips

Poisson

2016

Journal of Fish Biology

120

106

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A review of reported effects of pelagic longline fishing gear configurations on target, bycatch and vulnerable species

Santos,

Rosa,

Gonçalves

et al. 2023

Aquatic Conservation

Self Cite

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A meta‐analysis of 40 publications totalling 59 experiments was undertaken to review and assess the effects of changing the hook (circle vs. J‐hooks or tuna hooks), bait (fish vs. squid) and leader (wire vs. nylon) type on retention and at‐haulback mortality rates of teleosts (tunas and billfishes), elasmobranchs and sea turtles caught on shallow‐set and deep‐set pelagic longline fisheries. Circle hooks are a promising approach to mitigate the impact of pelagic longline fisheries on sea turtles, as they reduced sea turtle retention rates. The adoption of circle hooks would, however, also lead to a decrease in swordfish retention, the main target species of shallow‐set pelagic longlines. Using fish as bait resulted in lower retention rates of sea turtles, highlighting that option as an additional measure to further mitigate sea turtle bycatch. The bait type had non‐significant effects on sharks, except for blue shark and shortfin mako, for which at‐haulback mortality rates were significantly higher with fish bait. The use of nylon leaders instead of wire leaders could serve as a conservation measure for sharks, as they reduced the retention of blue shark without adversely impacting the catches of swordfish. The results on the effect of the leader material types should, however, be interpreted with caution owing to the limited information available reporting on leader material effects. When considering future research directions, priority should be given to experimental field work on the effects of leader material and on deep‐set longlines. Evaluating the post‐release survival of species should also be a priority.

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The biology and conservation status of the oceanic whitetip shark (Carcharhinus longimanus) and future directions for recovery

Young

Carlson

2020

Rev Fish Biol Fisheries

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Effects of hook and bait in a tropical northeast Atlantic pelagic longline fishery: Part II—Target, bycatch and discard fishes

Cited by 22 publications

References 33 publications

A review of capture and post‐release mortality of elasmobranchs

A review of capture and post‐release mortality of elasmobranchs

A review of reported effects of pelagic longline fishing gear configurations on target, bycatch and vulnerable species

The biology and conservation status of the oceanic whitetip shark (Carcharhinus longimanus) and future directions for recovery

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