Looking beyond the mortality of bycatch: sublethal effects of incidental capture on marine animals

Wilson, Samantha M.; Raby, Graham D.; Burnett, Nicholas J.; Hinch, Scott G.; Cooke, Steven J.

doi:10.1016/j.biocon.2014.01.020

Cited by 126 publications

(86 citation statements)

References 142 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Even without accounting for potential sublethal effects of hawksbill captures, such as fitness and reproduction impairment (Wilson et al, 2014), or post-release mortality (Snoddy & Southwood-Williard, 2010), which could further exacerbate impacts to the population, (Gaos et al, 2017). Curved carapace lengths listed in 1 cm increments.…”

Section: Discussionmentioning

confidence: 99%

Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

Liles¹,

Gaos

Bolaños³

et al. 2017

lajar

View full text Add to dashboard Cite

ABSTRACT. Small-scale coastal fisheries can cause detrimental impacts to non-target megafauna through bycatch. This can be particularly true when high-use areas for such species overlap with fishing grounds, as is the case with hawksbill turtle (Eretmochelys imbricata) aggregations at lobster gillnet fishing sites in El Salvador and Nicaragua. We quantified hawksbill bycatch by partnering with local fishers to record data for 690 gillnet sets on rocky reefs at Los Cóbanos Reef Marine Protected Area ) and Punta Amapala (2012 in El Salvador, and La Salvia (2012)(2013)(2014) in Nicaragua. Based on 31 observed hawksbill captures, the mean bycatch-per-unit-effort (0.0022; individuals per set = 0.0450) and mortality (0.74) are among the highest reported for the species across fishing gear types and oceanic regions worldwide, and we conservatively estimate that at least 227 juvenile hawksbill captures occurred in lobster gillnet fishing fleets at our sites during the study. Estimated mortality for the 227 hawksbills -which could approach the 74% observed mortality of total capturesfrom interactions with lobster gillnet fisheries at these sites during the study period may constitute the greatest single source of human-induced in-water mortality for juvenile, sub-adult, and adult hawksbills in the eastern Pacific, and is of grave concern to the population. Based on our findings, we discuss neritic habitat use by hawksbills during their 'lost years' and offer recommendations for bycatch reduction strategies, including community-based efforts to enhance sustainable self-governance via the establishment of locally crafted conservationist norms and marine protected areas at important developmental habitat.

show abstract

Section: Discussionmentioning

confidence: 99%

Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

Liles¹,

Gaos

Bolaños³

et al. 2017

lajar

View full text Add to dashboard Cite

show abstract

“…However, longline fishing pressure was not found to have statistically significant, direct detrimental effects on this population (Rolland et al 2009), unlike other pressures. Wilson et al (2014) highlighted the paucity of reports on incidentally caught seabirds being released alive compared with other marine organisms. Few seabirds are usually able to escape from pelagic longline fishing gear indeed (but see Huang and Liu 2010), and as a result sub-lethal effects of bycatch remain virtually undocumented for seabirds today (as opposed to crustaceans and mammals, Wilson et al 2014).…”

Section: Resultsmentioning

confidence: 97%

“…Other approaches, including population models and individual-borne camera surveys, suggested that interactions with fishing vessels may not have systematically significant, direct detrimental effects on seabirds (e.g., Rolland et al 2009;Sakamoto et al 2009;Barbraud et al 2011). Despite this figure, a recent review (Wilson et al 2014) highlighted the paucity of reports on incidentally caught seabirds being released alive, thus potentially hampering perspectives about sub-lethal effects of bycatch on seabirds. Here we report the intriguing case of an Indian yellow-nosed albatross Thalassarche carteri re-sighted on a monitored colony in the southern Indian Ocean, after an apparent non-lethal capture by a longlining vessel.…”

Section: Introductionmentioning

confidence: 95%

The rime of the modern mariner: evidence for capture of yellow-nosed albatross from Amsterdam Island in Indian Ocean longline fisheries

et al. 2015

View full text Add to dashboard Cite

International audienceCommercial fisheries currently pose a seriousthreat at sea to the conservation of a number of pelagicseabirds. However, these interactions are complex, andreports on population-specific bycatch in the high seas arescarce. Here we report the case of an Indian yellow-nosedalbatross Thalassarche carteri re-sighted on AmsterdamIsland after an apparent capture by an Indonesian longliner,as indicated by a message attached to the bird. Thisrecord demonstrates that Amsterdam birds may interactwith long-liners indeed, at least during winter, and thatsuch interactions are not systematically lethal. We suggestthat bycatch sub-lethal effects should be investigated atcolonies with high risks of individual capture at sea

show abstract

“…This is determined by the nature of the capture process used (Wilson et al, 2014) and also by the post-capture handling procedures (Milligan et al, 2009;Raicevich et al, 2011;Leocádio et al, 2012;Lorenzon et al, 2013). Improved practices in trawl fisheries, such as on-board recovery tanks, have made it possible to increase the proportion of trawl-caught crustaceans that can be transported alive successfully (Albalat et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Validation of a vigour index for trawl-caught Norway lobsters ( Nephrops norvegicus ) destined for the live market: Underlying links to both physiological condition and survivability

2017

View full text Add to dashboard Cite

Recent improved practices in the trawl fishery for Norway lobsters (Nephrops norvegicus) have made it possible to increase the proportion of trawl-caught lobsters that can be transported alive successfully. A major contributor to this has been the introduction of on-board seawater tanks, which allow for the recovery of animals immediately after they have been landed from the net.In this study, we have validated a vigour index that could be used both by fisheries scientists and by the industry dealing with live-traded Nephrops, allowing identification of the proportion of trawl-caught lobsters that fail to recover following capture and are not in a condition to survive live transportation. Results indicate that the process of visual selection into one of four possible vigour categories reflects with good accuracy the underlying physiological state of the animals, as assessed by the level of adenylate 5' -triphosphate in the tail muscles, by the proportions of other nucleotides as expressed in the Adenylate Energy Charge, and by the amount of intra-muscular L-lactate present. The vigour index also correlates well with their subsequent survival potential in a semi-dry transport system.

show abstract

Looking beyond the mortality of bycatch: sublethal effects of incidental capture on marine animals

Cited by 126 publications

References 142 publications

Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

Survival on the rocks: high bycatch in lobster gillnet fisheries threatens hawksbill turtles on rocky reefs along the Eastern Pacific coast of Central America

The rime of the modern mariner: evidence for capture of yellow-nosed albatross from Amsterdam Island in Indian Ocean longline fisheries

Validation of a vigour index for trawl-caught Norway lobsters ( Nephrops norvegicus ) destined for the live market: Underlying links to both physiological condition and survivability

Contact Info

Product

Resources

About