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SWFSC » Sharks » Longline and tagging equipment

(13 objects, created 9/29/2010)

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Album: This is a private album that is not visible to anonymous users Longline and tagging equipment

Summary: The Fisheries Resources Division of the Southwest Fisheries Science Center conducts research on several shark species. In order to monitor the populaitons and to collect data on life history and movements of these sharks they are caught on a longline and brought in to the research vessel. Scientists can then determine length, sex, obtain DNA, and tag the shark with both conventional and/or satellite tags before releasing it.

For more information visit the Large Pelagics Program of the Fisheries Resources Division.

Date:

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High Flier This high flier buoy is the first buoy deployed when setting longline gear.Key words: high flier, buoy, longlineDate:30 June 2006Contact: SWFSC Large Pelagics Program

High Flier

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Longline gear in the water A view of the longline set during the SWFSC's 2007 Juvenile Shark Survey. The buoys are set every five hooks in order to keep the longline floating at the proper depth.Key words: buoys, longlineDate: 8 July 2007Contact: SWFSC Large Pelagics Program

Longline gear in the water

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J Hook This photo shows a typical J hook used during the SWFSC 2007 juvenile shark survey.Key words: J hook, longlineDate: 3 July 2007Contact: SWFSC Large Pelagics Program

J Hook

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Circle hook This photo shows a circle hook. SWFSC conducted an experiment during one of its juvenile shark surveys to test the catch rate of circle hooks versus J hooks. Key words: circle hook, longlineDate: 30 June 2006Contact: SWFSC Large Pelagics Program

Circle hook

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Circle vs. J Hook This photo shows a circle hook on the left, the clip used to attach gangions and hooks to the longline in the center, and a J hook on the right. In many fisheries circle hooks are used because they hook less bycatch. Key words: circle hook, J hook, longlineDate: 30 June 2006Contact: SWFSC Large Pelagics Program

Circle vs. J Hook

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Stored J hooks This photo shows J hooks hooked through their longline clips. When not in use, the clips are hooked on a bar along the top of a trash can, and the gangion lines are inside the can, preventing them from getting tangled.Key words: J hook, longlineDate: 3 July 2007Contact: SWFSC Large Pelagics Program

Stored J hooks

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Towed satellite tag This satellite tag is designed to be towed free from the body on the black leader, which allows the tag antenna to have a better chance of breaking the surface of the oceean to connect to a satellite. This particular tag was put on a basking shark off of southern California.Key words: satellite tag, taggingDate: 8 June 2010Contact: SWFSC Large Pelagics Program

Towed satellite tag

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Pop-off satellite tag This pop-off satellite tag will be attached to a common thresher shark. After a predetermined period of time, the tag releases from the shark, floats to the surface, and transmit summarized data and its location. If the tag can be recoverd the full set of collected data can be downloaded. Key words: pop-off satellite tag,taggingDate: 26 June 2006Contact: SWFSC Large Pelagics Program

Pop-off satellite tag

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Spaghetti tag This spaghetti tag gets implanted into the top of a shark, just under the dorsal fin. The yellow portion of the tag remains attached to the shark, and contains a unique identifying number and the phone number and address of the Southwest Fisheries Science Center. If a fisherman catches a tagged shark, they can call the laboratory with the location of their catch, providing valuable information about range. Key words: spaghetti tag, conventional tag,taggingDate: 29 June 2006Contact: SWFSC Large Pelagics Program

Spaghetti tag

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Rototag This rototag shows a unique identifying number on one side, and the contact information of the Southwest Fisheries Science Center on the other. The tag is attached to the dorsal fin of sharks that have been injected with oxytetracycline. If fishermen catch a rototagged shark, they can contact the laboratory for a reward for information and a vertebral sample. The oxytetracycline marked vertebrae assist scientists in determining the age of the shark, in a manner similar to counting the rings on tress. Key words: rototag, conventional tag,taggingDate: 29 June 2006Contact: SWFSC Large Pelagics Program

Rototag

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Satellite tags From top to bottom this images shows a pop-off satellite tag attached to a pole spear, a SPOT satellite tag, and a pop-off satellite tag. These tags collect data such as location, light level (to determine day vs. night), and depth. Key words: satellite tags, taggingDate: 14 July 2006Contact: SWFSC Large Pelagics Program

Satellite tags

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Conventional tags This image shows a rototag (top) and spaghetti tag (bottom), along with their instruments for attachment. A rototag is clipped into a shark's dorsal fin, while the spaghetti tag is implanted in the back just below the dorsal fin. Both tags have unique identifying numbers and the contact information of the Southwest Fisheries Science Center. Fishermen assist our research by contacting us when they catch a tagged animal. Key words: conventional tags, taggingDate: 14 July 2006Contact: SWFSC Large Pelagics Program

Conventional tags

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