Swimbladder healing in Atlantic cod (<i>Gadus morhua</i>), after decompression and rupture in capture-based aquaculture

Midling, Kjell Ø.; Koren, Christian; Humborstad, Odd-Børre; Sæther, Bjørn‐Steinar

doi:10.1080/17451000.2011.638640

Cited by 30 publications

(32 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…floaters) in pot and longline gears was high (∼40%) compared to demersal seine and trawl, which are normally around 1-20% (unpublished data; Midling et al, 2012). It was also high in comparison with earlier studies on pots, in which 22% floaters were observed in Ramfjorden (northern Norway) at depths of 50-130 m (Løkkeborg et al, 2014) and "very few" floaters were reported by Furevik et al (2010) at a depth of 50 m at Smøla (western Norway).…”

Section: Discussionmentioning

confidence: 95%

“…It was also high in comparison with earlier studies on pots, in which 22% floaters were observed in Ramfjorden (northern Norway) at depths of 50-130 m (Løkkeborg et al, 2014) and "very few" floaters were reported by Furevik et al (2010) at a depth of 50 m at Smøla (western Norway). Floaters are susceptible to avian predation, solar radiation, unfavourable temperatures and are assumed to be poor candidates for live capture with high mortality in net pens (Midling et al, 2012). Our observed mortality of floaters (0.79; 95% CI: 0.62-0.89) confirms this and, combined with the high floater prevalence of about 40% in both gears, is a poor CBA result, which may or may not be extrapolated to other areas and seasons (see below).…”

Section: Discussionmentioning

confidence: 99%

“…Parrish and Moffitt, 1992;Rummer and Bennett, 2005). Cod have been shown to have a mechanism for dealing with swimbladder rupture, gas release and healing (Humborstad and Mangor-Jensen 2013;Midling et al, 2012) that counteracts the adverse effects of positive buoyancy and is an important reason for the success of CBA of cod in demersal seine fisheries. Individuals showing signs of positive buoyancy and an inability to submerge (Hochhalter, 2012) cannot be used for live storage purposes and are easily sorted out, as can fish with other visible physical injuries.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Survival and recovery of longline- and pot-caught cod (Gadus morhua) for use in capture-based aquaculture (CBA)

et al. 2016

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Survival and recovery of longline- and pot-caught cod (Gadus morhua) for use in capture-based aquaculture (CBA)

et al. 2016

Self Cite

View full text Add to dashboard Cite

“…Based on the presence of intraperitoneal gas bubbles and ability to re-submerge in the current study, it is possible that the majority of cod suffered swimbladder ruptures before handling (Humborstad and Mangor-Jensen, 2013). However, such trauma is considered minor and not a large contributor to mortality (Midling et al, 2012;Ferter et al, 2015a, b), suggesting that catch-and-release events did not increase depth-related injury and mortality.…”

mentioning

confidence: 99%

Estimating and mitigating the discard mortality of Atlantic cod (Gadus morhua) in the Gulf of Maine recreational rod-and-reel fishery

Capizzano

Mandelman

Hoffman³

et al. 2016

ICES Journal of Marine Science

View full text Add to dashboard Cite

In recent years, the recreational contribution to the total catch of Atlantic cod (Gadus morhua) in the Gulf of Maine (GOM) has increased with recreational discards outnumbering recreational landings by 2:1. However, the discard mortality (DM) rate of cod released in the recreational fishery remains poorly understood, thus contributing to the uncertainty in stock assessments and fishery management plans. The current study examined the capture-related factors most detrimental to cod DM in the GOM recreational rod-and-reel fishery. Atlantic cod (n ¼ 640; 26.0-72.0 cm) were angled from June-October 2013 on southern Jeffreys Ledge in the western GOM using fishing gear representative of the local recreational fishery. A subset (n ¼ 136) was also tagged with pressure-sensing acoustic transmitters before being released into an acoustic receiver array (n ¼ 31) deployed to monitor survival up to 94 days. To properly model DM up to the fishery-wide level, all cod were visually assessed for capture-related injuries according to a four-level injury score index. Mean tackle-specific DM rates of 15.4 and 21.2% were estimated for bait-and jig-captured cod, respectively, with an overall 16.5% mean DM rate for the 2013 GOM recreational cod fishery. Twenty-nine cod tagged with acoustic transmitters were identified as dead, where the majority ( 90%) died within 16 h post-capture. Upon evaluation with a specifically adapted parametric survival analysis, greater incidence of mortality was attributed to the capture and handling process (rather than release) for moderately and severely injured cod. Based on the capture-related factors associated with the highest injury rates, we recommend minimizing fight and handling times, avoiding areas with small cod, educating inexperienced anglers, and favouring bait over jigs to mitigate mortality. Results will continue to inform the development of fishery management plans and enhance survival through dissemination of "best practice" techniques to fishery stakeholders.

show abstract

“…Further, both Humborstad and Mangor-Jensen (2013) and Midling et al (2012) reported that the swim bladder of the Atlantic cod (Gadus morhua) is functional within days of perforation and capable of maintaining buoyancy.…”

Section: Discussionmentioning

confidence: 99%

Short-term survival of discarded pearl perch (Glaucosoma scapulare Ramsay, 1881) caught by hook-and-line in Queensland, Australia

Campbell¹,

McLennan²,

Sumpton³

2014

Fisheries Research

View full text Add to dashboard Cite

a b s t r a c tPost-release survival of line-caught pearl perch (Glaucosoma scapulare) was assessed via field experiments where fish were angled using methods similar to those used by commercial, recreational and charter fishers. One hundred and eighty-three individuals were caught during four experiments, of which >91% survived up to three days post-capture. Hook location was found to be the best predictor of survival, with the survival of throat-or stomach-hooked pearl perch significantly (P < 0.05) lower than those hooked in either the mouth or lip. Post-release survival was similar for both legal (≥35 cm) and sub-legal (<35 cm) pearl perch, while those individuals showing no signs of barotrauma were more likely to survive in the short term. Examination of the swim bladders in the laboratory, combined with observations in the field, revealed that swim bladders rupture during ascent from depth allowing swim bladder gases to escape into the gut cavity. As angled fish approach the surface, the alimentary tract ruptures near the anus allowing swim bladder gases to escape the gut cavity. As a result, very few pearl perch exhibit barotrauma symptoms and no barotrauma mitigation strategies were recommended. The results of this study show that pearl perch are relatively resilient to catch-and-release suggesting that post-release mortality would not contribute significantly to total fishing mortality. We recommend the use of circle hooks, fished actively on tight lines, combined with minimal handling in order to maximise the post-release survival of pearl perch.Crown

show abstract

Swimbladder healing in Atlantic cod (Gadus morhua), after decompression and rupture in capture-based aquaculture

Cited by 30 publications

References 18 publications

Survival and recovery of longline- and pot-caught cod (Gadus morhua) for use in capture-based aquaculture (CBA)

Survival and recovery of longline- and pot-caught cod (Gadus morhua) for use in capture-based aquaculture (CBA)

Estimating and mitigating the discard mortality of Atlantic cod (Gadus morhua) in the Gulf of Maine recreational rod-and-reel fishery

Short-term survival of discarded pearl perch (Glaucosoma scapulare Ramsay, 1881) caught by hook-and-line in Queensland, Australia

Contact Info

Product

Resources

About