Relative trap efficiency for recreationally caught eastern Australian blue swimmer crab (Portunus pelagicus) and associated injury and mortality of discards

Leland, Jesse C.; Butcher, Paul A.; Broadhurst, Matt K.; Paterson, Brian; Mayer, David G.

doi:10.1016/j.fishres.2013.07.006

Cited by 27 publications

(33 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The negligible mortality among P. armatus after trapping and sorting in the dry container confirms the previous estimate (≈1%) by Leland et al. () for similarly treated conspecifics. This result reiterates the species’ resilience (and that of other portunids and crustaceans in general; Uhlmann & Broadhurst, ) to withstand stressors associated with discarding after sorting under ambient conditions and from different fishing gears, including gillnets (below ≈6% mortality; Broadhurst, Millar & Brand, ) and trawls (below ≈16%; Wassenberg & Hill, , ).…”

Section: Discussionsupporting

confidence: 90%

“…While Leland, Butcher, Broadhurst, Paterson and Mayer () showed that the short‐term (three days) mortality of trapped and discarded P. armatus was negligible (≈1%), the assessed treatments were limited to sorting and discarding under ambient conditions. As in other Australian trap fisheries (e.g., Bellchambers, Smith & Evans, ) and based on the known pacifying effects of cool temperatures on crustaceans studied overseas (e.g., Brown, White, Chaille, Russell & Oseto, ; Chung, Cooper, Graff & Cooper, ; Fregin & Bickmeyer, ; Premarathna, Pathirana, Jayanth Rajapakse & Pathirana, ), some NSW commercial portunid trappers empty their catches of P. armatus into on‐board ice slurries (<5°C) for a few minutes to reduce activity and injuries, so as to maximise the quality of retained catches.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Short‐term mortality of trapped and discarded Portunus armatus following ice‐slurry immersion

Broadhurst

Millar

2018

Fisheries Management Eco

Self Cite

View full text Add to dashboard Cite

In southeastern Australia, some commercial fishers sort their catches of trapped Portunus armatus in ice slurries to pacify and facilitate discarding sub‐legal and ovigerous individuals, but with unknown mortality. To estimate mortality, during 90 trap lifts, 101 and 110 small P. armatus were sorted dry and in ice slurries, respectively (over 0.5–10.0 min). All discards were individually caged and monitored with 32 similar‐sized control animals (caught by benign methods) for 48 hr. Irrespective of handling, only eight discarded P. armatus were physically damaged. None of the controls died, compared with 1 and 13% of the dry‐ and ice‐slurry sorted conspecifics. The probability of mortality was estimated at 0.005 immediately after emptying the traps and remained temporally constant for dry‐sorted individuals, but was positively associated with time in the ice slurries, reaching 50% at 9 min. Minimising sorting in ice slurries to <2 min should cause minimal impact to P. armatus, although other unaccounted mortalities (e.g., predation) and sublethal effects warrant assessment.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Short‐term mortality of trapped and discarded Portunus armatus following ice‐slurry immersion

Broadhurst

Millar

2018

Fisheries Management Eco

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ikhwanuddin 3 , Siriporn Pradit hauling process. Cryptic bycatch is meant organisms entangled to fishing gears and having injury, yet died after trying to escape from the gears (Leland et al, 2013;Reeves et al, 2013). Ghost fishing is referred to active gill nets lost or abandoned by fishers which can cause mortality to the marine species (Campbell and Sumpton, 2009).…”

Section: Hisam Fazrulmentioning

confidence: 99%

“…However, it is not a subset of bycatch since the target species is often discarded. In general, there are three types of bycatch; normal, cryptic and ghost fishing (Leland et al, 2013). Normal bycatch is defined as non-target species trapped in gill nets, alive or dead, during…”

Section: Introductionmentioning

confidence: 99%

Untitled

Fazrul¹,

Hajısamae²,

Ikhwanuddin³

et al. 2015

Turk. J. Fish. Aquat. Sci.

View full text Add to dashboard Cite

This study assessed bycatch composition and some factors affected assemblage from blue swimming crab fisheries in semi-enclosed Pattani Bay and offshore area, the Gulf of Thailand. Samples were collected from May 2013 to September 2014 by using crab gill net. One hundred seventy four of bycatches were found within proportion of 52.2% in the bay and 49.5% from offshore. Moreover, discarded species from the bay and offshore were 26.3% and 47.1%, respectively. The most dominant species in the bay was horse shoe crab (Carcinoscorpius rotundicauda) while offshore was scaly whipray (Himantura imbricate). Abundance of bycatch in the bay was affected both by habitat (P<0.005) and season (P<0.001) while abundance from offshore was affected only by season (P<0.05). Species richness of bycatch both in the bay and offshore were influenced significantly by season (P<0.001 and P<0.005, respectively). The most abundance bycatch in the bay was found in the inner bay while at 15m depth for offshore. The result of nMDS ordination indicated a separation of three major groups of assemblage in the bay; inner, middle and outer bay but there was no obvious segregation from offshore.

show abstract

“…Normal bycatch is a non-target species trapped in nets, alive or dead, during hauling process. Cryptic bycatch constitutes of organisms entangled in fishing gears and develops injury and die after trying to escape from the gears (Leland, et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Contribution of Bycatch in Gillnet Fishery of Saroda Reservoir, Kabeerdham District, Chhattisgarh (India)

Anirudh¹,

Jakhar²,

Vardia³

2017

Int.J.Curr.Microbiol.App.Sci

View full text Add to dashboard Cite

Relative trap efficiency for recreationally caught eastern Australian blue swimmer crab (Portunus pelagicus) and associated injury and mortality of discards

Cited by 27 publications

References 32 publications

Short‐term mortality of trapped and discarded Portunus armatus following ice‐slurry immersion

Short‐term mortality of trapped and discarded Portunus armatus following ice‐slurry immersion

Untitled

Contribution of Bycatch in Gillnet Fishery of Saroda Reservoir, Kabeerdham District, Chhattisgarh (India)

Contact Info

Product

Resources

About