Show simple item record

Preliminary Observation of Depredation by Bottlenose Dolphins on the King Mackerel Troll Fishery in Florida

dc.contributor.advisor Read, Andrew J
dc.contributor.author Zollett, Erika A.
dc.date.accessioned 2007-06-22T20:04:48Z
dc.date.available 2007-06-22T20:04:48Z
dc.date.issued 2004
dc.identifier.uri https://hdl.handle.net/10161/256
dc.description.abstract Conflicts between marine mammals and fisheries can be attributed to spatial overlap and resource competition between cetaceans and fisheries and/or behavioral learning among marine mammals. In the present study, I documented depredation by bottlenose dolphins (Tursiops truncatus) in Florida’s king mackerel troll fishery. Depredation refers to the behavior in which predator species remove or damage fish on fishing lines or in nets. I conducted twenty-six surveys of charter and commercial fishermen in Islamorada, Florida and twenty-three along Florida’s east coast from Fort Pierce south to Lake Worth Inlet, and I observed dolphin behaviors from working vessels in these two study sites. All survey respondents indicated they had observed bottlenose dolphins depredating bait or catch. Fishermen reported that king mackerel was the species most often taken by bottlenose dolphins. From behavioral observations, I found that dolphins took 6% of king mackerel caught by charter fishermen and 20% of fish caught by commercial fishermen. I attributed these differences to seasonal variation in fish distribution or gear differences between vessel types. Preliminary tests demonstrated that a modification to the outrigger planar will successfully deter bottlenose dolphins from engaging in depredation, without causing a reduction in catch.
dc.format.extent 106891 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject Bottlenose dolphins (Tursiops truncatus)
dc.subject Fisheries
dc.subject King Mackerel Troll fishery, Florida
dc.subject Depredation
dc.title Preliminary Observation of Depredation by Bottlenose Dolphins on the King Mackerel Troll Fishery in Florida
dc.type Master's project
dc.department Nicholas School of the Environment and Earth Sciences


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record