Circle Hook Performance in the Uruguayan Pelagic Longline Fishery

Domingo, Andrés; Pons, Maite; Jiménez, Sebástian; Miller, Philip; Barceló, Caren; Swimmer, Yonat

doi:10.5343/bms.2011.1069

Cited by 38 publications

(30 citation statements)

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“…Hooking location was seldom registered by the observers, but none of those specimens documented were hooked at the mouth (n ¼ 23). Similar results have also been observed with leatherback turtles (Dermochelys coriacea), which are much more frequently hooked externally or entangled in the branch line than hooked at the mouth (Sales et al 2010;Domingo et al 2012). These observations reflect longline fisheries' low selectivity over species with diets that normally do not include the typical species used as bait (cephalopods and small fishes), and also highlights the limitations of using longline fisheries data to assess the abundance of this particular group of species.…”

Section: By-catch Patternssupporting

confidence: 73%

Mobulid ray by-catch in longline fisheries in the south-western Atlantic Ocean

Mas¹,

Forselledo²,

Domingo³

2015

Mar. Freshwater Res.

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This paper presents the first by-catch assessment focussed on mobulid rays in pelagic longline fisheries based on on-board scientific observer data (1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013) over the south-western Atlantic. Mobulid diversity, as well as their catch distribution and disposition, were investigated. Mobulid by-catch frequency was low, but by-catch probability increased at lower bottom depths (i.e. continental shelf and slope), higher fishing effort and during the warm period (summer-autumn). Photographic and video records allowed the identification of two devil ray species, the spinetail devil ray (Mobula japanica) and the bentfin devil ray (Mobula thurstoni), but the number of species interacting with longliners in the region could also be greater. Southernmost captures of both species (368S) exceed previous reported records by almost 128, therefore greatly expanding their known distribution ranges towards southern waters in the south-western Atlantic. Mobulids were never retained on board, and most of them were released alive. However, hooks were often not removed from their bodies and on several occasions fishermen caused injuries while trying to cut the branch line, so some uncertainty remains regarding their post-capture mortality. More specific studies that assess these particular aspects are needed to better understand the potential effect of longline fisheries on mobulid populations.

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Section: By-catch Patternssupporting

confidence: 73%

Mobulid ray by-catch in longline fisheries in the south-western Atlantic Ocean

Mas¹,

Forselledo²,

Domingo³

2015

Mar. Freshwater Res.

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“…Domingo et al . () while testing Florida style longlines with J and circle hooks baited with a mix of squid and mackerel off Uruguay, found a 24% non‐significant decrease ( P = 0.06) in swordfish catch with circle hooks compared with J‐hooks. In the north‐western Atlantic Ocean, Watson et al .…”

Section: Discussionmentioning

confidence: 99%

“…Off Uruguay, Domingo et al . () tested a Florida style longline with J and circle hooks baited with a mix of squid and mackerel, and found an increase in catch rates of blue and shortfin mako with circle hooks compared with J‐hooks, although only significant in the case of the latter species. Foster et al .…”

Section: Discussionmentioning

confidence: 99%

Effects of 17/0 circle hooks and bait on fish catches in a Southern Atlantic swordfish longline fishery

Amorim

Santos

Coelho

et al. 2014

Aquatic Conservation

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ABSTRACT1. This paper reports the results of using different hook style and bait type combinations on the catches of targeted, bycatch and discarded fishes in the Portuguese commercial longline fishery targeting swordfish (Xiphias gladius) in the South Atlantic Ocean.2. In total, 310 longline experimental sets (446 400 hooks) were deployed between October 2008 and February 2012. Three different hook styles were tested; the traditional J-hook (9/0) 10 o offset was compared with two 17/0 circle hooks (a non-offset and a 10 o offset), and squid (Illex spp.) bait was compared with mackerel (Scomber spp.).3. Catch per unit effort (CPUE) was calculated for each fish species per fishing set and compared between the different hook style and bait type combinations. Results indicated that the effects of hook style and bait on the CPUEs were species-specific. For example, swordfish (target species, Xiphias gladius) CPUEs were higher with J-hooks baited with squid, while for the blue shark (most important bycatch species, Prionace glauca) the highest CPUEs were obtained with circle hooks baited with mackerel. For tuna (Thunnus spp.) and marlin (blue, Makaira nigricans and white, Kajikia albida) only the bait effect was significant, with higher catches with squid.4. For the discarded species, the proportions of alive vs dead specimens at the time of fishing gear retrieval were also species-specific. 5. The total retained catch value per unit of effort (VPUE) did not changed between the different hook and bait combinations, but these VPUEs are highly dependent on market fluctuations.

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“…,Domingo et al (2012),Kerstetter & Graves (2006a),Kim et al (2006Kim et al ( , 2007,), Promjinda et al (2008,Ward et al . (2013),Curran & Bigelow (2011), Domingo et al (2012,Kim et al (2006Kim et al ( , 2007,), Ward et al (2011), Domingo et al (2012,Huang et al (2016),Kim et al (2006Kim et al ( , 2007, Pacheco et al (2011), Sales et al (2010), Ward et al Andraka et al (2013), Curran & Bigelow (2011), Domingo et al (2012), Huang et al (2016), Kim et al (2006, 2007), Largacha et al (2005), Pacheco et al (2011), Promjinda et al (2008), Sales et al (2010), Ward et al Andraka et al (2013), Curran & Bigelow (2011), Domingo et al (2012), Foster et al (2012), Huang et al (2016), Kim et al (2006, 2007), Largacha et al (2005), Pacheco et al (2011), Sales et al (2010), Ward et al Andraka et al (2013), Boggs & Swimmer (2007), Bolten & Bjorndal (2005), Cambiè et al (2012), Domingo et al (2012), Foster et al (2012), Gilman et al (2007), Huang et al (2016), Mejuto et al (2008), Piovano et al (2012), Sales et al (2010) VU Green sea turtle 10 0.72 0.49-1.06 37% .100 Andraka et al (2013), Largacha et al (2005), Pacheco et al (2011), Sales et al Andraka et al (2013), Huang et al (2016), Kim et al (2006, 2007), Largacha et al (2005), Mejuto et al (2008), Pacheco et al Andraka et al (2013), Domingo et al (2012), Foster et al (2012), Gilman et al (2007), Huang et al (2016), Mejuto et al (2008), Pacheco et al (2011), Sales et al (2010), Santos et al Andraka et al (2013), Kim et al (2006, 2007), Pacheco et al (2011), Promjinda et al (2008) LC White marlin 2 0.98 0.77-1.25 0% .880 Andraka et al (2013), Pacheco et al (2011) VU T A B L E 1 (Continued) (Continues) of the scope of the studies analysed. The random effects model computes a global mean effect size based on a weighted mean of the studies' effect sizes, where the global mean estimate represents the average of the true underlying distribution of effect sizes from which…”

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confidence: 99%

Catch rate and at‐vessel mortality of circle hooks versus J‐hooks in pelagic longline fisheries: A global meta‐analysis

Reinhardt¹,

Weaver²,

Latham³

et al. 2017

Fish and Fisheries

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We conducted a meta‐analysis of literature reporting on the use of circle hooks and J‐hooks in pelagic longline fisheries. Our study included more data than previous meta‐analyses of the effects of hook type, due to both a larger number of relevant studies available in recent years and a more general modelling approach. Data from 42 empirical studies were analysed using a random effects model to compare the effects of circle hooks and J‐hooks on catch rate (43 species) and at‐vessel mortality (31 species) of target and bycatch species. Catch rates with circle hooks were greater for 11 species, including four tuna species, six shark species and one Istiophorid billfish. Catch rates on circle hooks were lower for seven species, including two Istiophorid billfishes and two species of sea turtle. At‐vessel mortality was significantly lower with circle hooks in 12 species, including three tuna species, three Istiophorid billfishes, swordfish (Xiphias gladius) and three shark species. No species had significantly greater at‐vessel mortality when captured with a circle hook rather than a J‐hook. While our general approach increased model variability compared to more detailed studies, results were consistent with trends identified in previous studies that compared the catch rates and at‐vessel mortality (between hook types) for a number of species. Our results suggest that circle hooks can be a promising tool to reduce mortality of some bycatch species in pelagic longline fisheries, although the effects depend on the species and the metric (catch rate or at‐vessel mortality), emphasizing the need for fishery‐specific data in conservation and management decisions.

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Circle Hook Performance in the Uruguayan Pelagic Longline Fishery

Cited by 38 publications

References 0 publications

Mobulid ray by-catch in longline fisheries in the south-western Atlantic Ocean

Mobulid ray by-catch in longline fisheries in the south-western Atlantic Ocean

Effects of 17/0 circle hooks and bait on fish catches in a Southern Atlantic swordfish longline fishery

Catch rate and at‐vessel mortality of circle hooks versus J‐hooks in pelagic longline fisheries: A global meta‐analysis

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