Results 161 to 170 of about 1,951 (181)

Dynamics of a mussel longline system

Aquacultural Engineering, 2003
Abstract The equations of the three dimensional motion of a submerged mussel longline system are formulated using Kane's formalism. The line is modelled using lumped masses and tension-only springs including structural damping. The mussel culture is modelled as lumped masses attached to the main line.
Raman-Nair, W., Colbourne, D. B.
openaire   +1 more source

How fast do demersal longlines sink?

Fisheries Research, 2003
Abstract Longlines that sink fast reduce the time available to seabirds to attack baited hooks and are important in efforts to minimise seabird by-catch in longline fisheries. We measured sink rates in still seawater of longlines commonly used in the world’s demersal fisheries. Lines with integrated weight (lead cores) sank two to three times faster (
Graham Robertson, Egil Moe, Roy Haugen, Barbara Wienecke   +3 more
openaire   +1 more source

Estimating Abundance from Longline Catches

Journal of the Fisheries Research Board of Canada, 1960
The various factors that enter into the catch of fish by a baited longline are combined into equations that permit using the information afforded by the catches to compute linear estimates of abundance, providing that all rates can be estimated reasonably accurately, and assuming they are linear.
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Putting Longline Bycatch of Sea Turtles into Perspective

Conservation Biology, 2006
Abstract:  Although some sea turtle populations are showing encouraging signs of recovery, others continue to decline. Reversing population declines requires an understanding of the primary factor(s) that underlie this persistent demographic trend.
Rebecca L, Lewison, Larry B, Crowder
openaire   +2 more sources

Shark interactions in pelagic longline fisheries

Marine Policy, 2008
Substantial ecological, economic and social problems result from shark interactions in pelagic longline fisheries. Improved understanding of industry attitudes and practices towards shark interactions assists with managing these problems. Information on fisher knowledge and new strategies for shark avoidance may benefit sharks and fishers.
Eric Gilman, Shelley Clarke, Nigel Brothers, Joanna Alfaro Shigueto, John Mandelman, Jeff Mangel, Samantha Petersen, PIOVANO, SUSANNA, Nicola Thomson, Paul Dalzell, Miguel Donoso, Meidad Goren, Tim Werner   +12 more
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Unequal sex ratios in longline catches

Journal of the Marine Biological Association of the United Kingdom, 2001
There is sometimes a significant bias in the sex ratio of fish caught by longline. Usually, more females than males are caught. The possible reasons for unequal sex ratios in longline catches are listed and discussed. One sex could be more common in the area where the fishery takes place because there really is an unequal sex ratio in the population or
P. Wirtz, T. Morato
openaire   +1 more source

Albatross and longlining—Managing seabird bycatch

Marine Policy, 1997
Abstract Seabirds can be accidentally injured or killed during certain types of fishing. The fishing method currently under most scrutiny for its impact on seabird populations is demersal and pelagic longlining. The main species of concern at present are albatross. This paper outlines current mitigation measures, both gear and operational changes, to
openaire   +1 more source

Hematological indicators of stress in longline-captured sharks

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 2012
For many shark species, little information exists about the stress response to capture and release in commercial longline fisheries. Recent studies have used hematological profiling to assess the secondary stress response, but little is known about how, and to what degree, these indicators vary interspecifically. Moreover, there is little understanding
Heather, Marshall, Lyndsay, Field, Achankeng, Afiadata, Chugey, Sepulveda, Gregory, Skomal, Diego, Bernal   +5 more
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Applications of the longline simulator (LLSIM) using US pelagic longline logbook data and Atlantic blue marlin

Fisheries Research, 2019
Abstract Spatiotemporal variability in fishing patterns and species distributions from ocean climatology confound analysis of pelagic longline CPUE. A generalized computer program, LLSIM, was developed to simulate such data to test methods used to quantify abundance trends.
Francesca C. Forrestal, C. Phillip Goodyear, Michael Schirripa   +2 more
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Integrated weight longlines with paired streamer lines – Best practice to prevent seabird bycatch in demersal longline fisheries

Biological Conservation, 2008
To evaluate a new technology – integrated weight longlines (IW) – as a viable seabird mitigation technology for demersal longline fisheries, we compared three experimental mitigation treatments, IW line alone, IW with paired streamer lines (IWPS) and unweighted longlines (UW) with PS (UWPS), to a control of no deterrent (UW alone). Trials took place on
Kimberly S. Dietrich, Edward F. Melvin, Loveday Conquest   +2 more
openaire   +1 more source