Effect of the headline height of gillnets on species selectivity in the Gulf of Maine

He, Pingguo

doi:10.1016/j.fishres.2005.11.015

Cited by 8 publications

(11 citation statements)

References 7 publications

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“…There have been few such studies to date, however, and appropriate field studies in conjunction with the fishing industry would be required to gauge which measures would be most effective to reduce incidental shark by‐catch and mortality. He () examined the use of a tie‐down gillnet in relation to a standard gillnet used in a fishery for cod Gadus morhua L. 1758. The lower height of the tie‐down gillnet reduced the catch of S .…”

Section: Discard Mortality Of Elasmobranchs By Gearmentioning

confidence: 99%

A review of capture and post‐release mortality of elasmobranchs

Ellis

Phillips

Poisson

2016

Journal of Fish Biology

127

108

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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: Discard Mortality Of Elasmobranchs By Gearmentioning

confidence: 99%

A review of capture and post‐release mortality of elasmobranchs

Ellis

Phillips

Poisson

2016

Journal of Fish Biology

127

108

View full text Add to dashboard Cite

show abstract

“…The 8 meshes deep (MD) experimental gillnets caught signifi cantly less cod than the regular 25 MD net, whereas the catch effi ciency for fl ounders (mainly American plaice [ Hippoglossoides platessoides ]) was similar (He 2006b ). The extended gillnets with an extra 10 meshes of webbing (35 MD) caught signifi cantly more Atlantic cod than the standard 25 MD nets in tests in Newfoundland (Yetman 1989 ).…”

Section: Measures To Reduce Bycatch and Discards In Gillnetsmentioning

confidence: 99%

“…Norwegians use much higher gillnets (60 MD) when targeting cod (Engas et al 2000 ). Similarly, nets with tie -down lines caught more fl ounder and other bottom -dwelling animals (e.g., lobsters) but less cod than the standard cod net due to a reduced vertical profi le and a large amount of slack netting near the seabed (He 2006b ).…”

Section: Measures To Reduce Bycatch and Discards In Gillnetsmentioning

confidence: 99%

“…Crabs and lobsters are strongly substrateassociated and thus are often caught in groundfi sh gillnets (God ø y et al 2003 ;He 2005He , 2006b. In some jurisdictions, retention of crustacean species is prohibited in gillnet fi sheries or they are so abundant as to become a nuisance.…”

Section: Measures To Reduce Bycatch and Discards In Gillnetsmentioning

confidence: 99%

“…Trippel et al (1996) found that the majority (96%) of porpoise bycatch was on the upper twothirds of the gillnet that had a standup height of approximately 4 to 5 m. A reduced height gillnet may have a positive effect on reducing porpoise bycatch in the gillnet fi shery. For some bottomdwelling species such as fl ounder, the height of the net may be reduced without affecting the catch of the target species (He, 2006b ). Other measures to reduce bycatch of harbor porpoises focus on prevention of entanglement through the use of stiff, neutrally buoyant or sinking ropes or on escape once entanglement occurs, through weak ropes or weak links.…”

Section: Interaction Of Marine Mammals Seabirds and Sea Turtles Witmentioning

confidence: 99%

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