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HomeNews RoomFact SheetBanning Wire Leaders: A Practical Solution for Reducing Shark Bycatch in Pelagic Longlines
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Fact Sheet Oct 28, 2011Global Shark ConservationContact: Joanna Benn, 202.247.5823
Longlines are used to target and catch swordfish, tuna, and other valuable fish. But they also catch many other species, including sharks, which are often thrown back in the water dead or dying. Longline fishing is one of the world's most widespread fishing activities, with monofilament lines that can extend up to 40 miles and are baited with thousands of hooks. Even when sharks are not the target of a fishery, their catch can be substantial and can even make up more than the total catch of the targeted species. The fishing of sharks is often unregulated and unreported, especially at the species level. As a result, the bycatch of sharks in these fisheries is considered one of the most significant problems to the management of sharks globally. It is vital that mitigation measures be adopted to reduce the bycatch of sharks particularly in longline fisheries.
Why are monofilament nylon leaders better for sharks?
Many longline vessels use a wire leader (also known as a "steel trace") to secure their catch on the line, but scientific studies have been conducted that show a nylon monofilament leader is actually a better gear option for reducing bycatch and increasing the targeted catch. The catch rate of sharks is higher on wire leaders than on nylon leaders. When caught on a wire leader, sharks can remain hooked for hours until the longline is hauled back on the boat. When the longline is retrieved, the sharks are often body gaffed or have the hook ripped out, both of which cause stress and increase mortality. When caught on the nylon monofilament leader, sharks are able to use their sharp teeth to bite through the material and escape. Escapees on nylon leaders are expected to suffer less injury and stress than sharks caught on wire leaders. As a result, the use of the nylon leader decreases bycatch of shark in the longline fishery and may increase the survival of the sharks that are able to escape.
Why are nylon monofilament leaders better for fishermen?
Many fishermen targeting tuna and swordfish prefer using nylon monofilament leaders, which increases the diversity of species caught and improves the catch of some target species. Fishermen believe the use of wire leaders can actually decrease target species catch, depending on the target species. Nylon leaders improve the natural looking movement of bait, which is important to tuna, and some fishermen believe tuna are able to see and avoid wire leaders. Tuna have smaller teeth and are less likely to bite through the nylon leader. Thus, catch rates for some targeted tuna catch is higher on nylon leaders. Catch of swordfish has been found to be higher on nylon monofilament as well. As a result, many fishermen use wire leaders only when wishing to maximize shark retention, creating a de facto shark fishery.
Althoguh more gear is lost (bitten off of branchlines) when nylon leaders are used, interviews conducted with fishermen reveal that they generally do not consider this to be a large problem. In fact, as a safety measure and to save time, many fishermen will cut the leaders near the sharks, losing hooks in the process. Fishermen have noted the gear damage and loss through the escape of sharks is outweighed by the financial benefits from the increased catch of species, such as bigeye tuna (Thunnus obesus). In Australia, it was calculated that overall returns outweighed the cost of using nylon leaders and financial benefit was about US$8,000 per year. Thus, fishermen have found it economically beneficial to use nylon leaders instead of wire leaders.
Fact Sheet File: Banning Wire Leaders: A Practical Solution for Reducing Shark Bycatch in Pelagic Longlines (PDF)
http://www.pewenvironment.org/news-room ... 9365761....
HomeNews RoomFact SheetBanning Wire Leaders: A Practical Solution for Reducing Shark Bycatch in Pelagic Longlines
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Fact Sheet Oct 28, 2011Global Shark ConservationContact: Joanna Benn, 202.247.5823
Longlines are used to target and catch swordfish, tuna, and other valuable fish. But they also catch many other species, including sharks, which are often thrown back in the water dead or dying. Longline fishing is one of the world's most widespread fishing activities, with monofilament lines that can extend up to 40 miles and are baited with thousands of hooks. Even when sharks are not the target of a fishery, their catch can be substantial and can even make up more than the total catch of the targeted species. The fishing of sharks is often unregulated and unreported, especially at the species level. As a result, the bycatch of sharks in these fisheries is considered one of the most significant problems to the management of sharks globally. It is vital that mitigation measures be adopted to reduce the bycatch of sharks particularly in longline fisheries.
Why are monofilament nylon leaders better for sharks?
Many longline vessels use a wire leader (also known as a "steel trace") to secure their catch on the line, but scientific studies have been conducted that show a nylon monofilament leader is actually a better gear option for reducing bycatch and increasing the targeted catch. The catch rate of sharks is higher on wire leaders than on nylon leaders. When caught on a wire leader, sharks can remain hooked for hours until the longline is hauled back on the boat. When the longline is retrieved, the sharks are often body gaffed or have the hook ripped out, both of which cause stress and increase mortality. When caught on the nylon monofilament leader, sharks are able to use their sharp teeth to bite through the material and escape. Escapees on nylon leaders are expected to suffer less injury and stress than sharks caught on wire leaders. As a result, the use of the nylon leader decreases bycatch of shark in the longline fishery and may increase the survival of the sharks that are able to escape.
Why are nylon monofilament leaders better for fishermen?
Many fishermen targeting tuna and swordfish prefer using nylon monofilament leaders, which increases the diversity of species caught and improves the catch of some target species. Fishermen believe the use of wire leaders can actually decrease target species catch, depending on the target species. Nylon leaders improve the natural looking movement of bait, which is important to tuna, and some fishermen believe tuna are able to see and avoid wire leaders. Tuna have smaller teeth and are less likely to bite through the nylon leader. Thus, catch rates for some targeted tuna catch is higher on nylon leaders. Catch of swordfish has been found to be higher on nylon monofilament as well. As a result, many fishermen use wire leaders only when wishing to maximize shark retention, creating a de facto shark fishery.
Althoguh more gear is lost (bitten off of branchlines) when nylon leaders are used, interviews conducted with fishermen reveal that they generally do not consider this to be a large problem. In fact, as a safety measure and to save time, many fishermen will cut the leaders near the sharks, losing hooks in the process. Fishermen have noted the gear damage and loss through the escape of sharks is outweighed by the financial benefits from the increased catch of species, such as bigeye tuna (Thunnus obesus). In Australia, it was calculated that overall returns outweighed the cost of using nylon leaders and financial benefit was about US$8,000 per year. Thus, fishermen have found it economically beneficial to use nylon leaders instead of wire leaders.
Fact Sheet File: Banning Wire Leaders: A Practical Solution for Reducing Shark Bycatch in Pelagic Longlines (PDF)
Hook and line are the only allowable gear for harvesting sharks and the use of natural bait ...
so what we can't use leader wire any more ... am lost .. with this shit ... what the fuck they trying to do...
how stupid are you hook and line is just the term they use all it means is you have to fish for them on rod and reel using line, leader and hooks. they are just letting you know itis illegal to spear, net, or catch them any way like that that doesnt use rod and reel
I'v herd that circle hooks will be the only hook used with dead bait. The reason for the longliners useing mono is to cut down on the bi catch which is sharks. Myself John and Joey have been useing circle hooks for 3 years. We have figured out how to rig them and have a good hook up rate. Even better it's usually hooked in the mouth not in the gills or deeper with the bait still on the hook. Sometimes ya have to give the hook up. The circle hook has an amazing torke . 45 of our 52 was caught on circle hooks. Joeys big tiger the 2 big uns I caught this year, circle hooks. More laws on us that the commercial fisherman doesnot have to follow. 9 miles off shore and it's legal so on goes the kill tournaments. Still got a price tag and still win prize money on these fish just now we are subject to harassment and are not allowed to harvest. All about making money on the tags I think. A good shovel and a big sharp knife and the crabs will be in heaven. Let it go dead or try to cover ya tracks? Ha Ha they are so behind they look like fools. NOAA recognized it 10 years ago and put commercial quotas on large costals. The fishermen noticed it in the 80s. A little late huh. The vergin timber is already gone. $$$$
Land Based World Record #5 short fin Mako 700lbs
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Land Based World Record #8 Tiger shark 928lbs
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Land Based World Record #9 Tiger shark 949lbs
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The long line boats have to use mono. See they are not fishing for sharks. The sharks are a bi catch. If the mono will let the shark go sometimes instead of it staying on the line for 10 hrs it is best. We can use wire. I think that came into play for the longliners a while back. They also are doing week hook experiments. Week hooks will strengthen and let a big fish go. The big fish the longliner is not targeting. As far as the hook and line doesnot mean we have to use a hand line. That is just more FWC terminology for fishing pole. So ya cant net spear bow and arrow or bang stick a shark. The only thing that will change is what kind of hooks we use. Now you can use as many j or circle hooks on one line as you want, ya just can't use a double ,treble or four way hook. More than likely we Gona have to swap to circle hooks. So now we get our stuff out and the officer arrives and wants to see what's on the end of the line. He better plan on staying till I get ready to go or learn to paddle a kayak.
Land Based World Record #5 short fin Mako 700lbs
Team
Land Based World Record #8 Tiger shark 928lbs
True
Land Based World Record #9 Tiger shark 949lbs
Blue
SFSC Panhandle Events Coordinator
wait?so do we have to use circles now or is it just that you guys think they will make that rule soon
Not a rule YET - BUT - Just because they said that they'll gonna begin educating people to use circle hooks - makes me think something - Do you guys think that as of 01-01-2013 they won't enforce the use of circle hooks? Not for nothing, but they'll be splashing in the face to people using J hooks, at the future meetings stuff like - "Well, sir we educate people this year anyway about the usage of circle hooks, so enforcing this from 01-01-2013 shouldn't be an issue anymore" Something like this, makes me sarcastically smile, just thinking about it, how predictable these "anti fishing campaign" are. To make my position clear, i personally don't have anything with circle hooks, as a matter of fact, i only use circle hooks when comes to shark fishing, BUT MANY MANY people are far away to UNDERSTAND the proper way of using them, AND A SHORT TIME LIKE THIS TO MAKE THIS INTO A LAW, IS JUST A BAD BAD LAW, IF SOMETHING LIKE THIS WILL BE A LAW SOON.
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