Comparison of two techniques for estimating tilefish, yellowedge grouper, and other deepwater fish populations.

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dc.acquisition-srcen_US
dc.call-noen_US
dc.contract-noen_US
dc.contributor.authorMatlock, G.C.en_US
dc.contributor.authorNelson, W.R.en_US
dc.contributor.authorJones, R.S.en_US
dc.contributor.authorGreen, A.W.en_US
dc.contributor.authorCody, T.J.en_US
dc.contributor.authorGutherz, E.en_US
dc.contributor.authorDeorzbacher, J.en_US
dc.contributor.otherFishery Bulletinen_US
dc.date.accessioned2010-02-15T17:03:31Z
dc.date.available2010-02-15T17:03:31Z
dc.date.issued1991en_US
dc.degreeen_US
dc.descriptionp. 91-99.en_US
dc.description-otheren_US
dc.description.abstractTilefish Lophopatilus chamaeleonticeps and yellowedge grouper Epinephelus flavolimbatus are deepwater fishes and targets of a relatively recent bottom longline fishery in th Gulf of Mexico. They are long-lived, slow growing, have very limited movements and distribution, and are susceptible to longlines. However, population size and life-history parameter estimates are generally unknown for Gulf fish. This study compared two methods for estimating population sizes to determine the most cost-effective one for use on long-term fishery-independent stock assessments. Bottom longlines were used to deplete fish from a small area, and a regression of catch per effort on cumulative catch was used to estimate the area's population prior to fishing. The population was also estimated by counting fish burrows from a submersible and expanding the mean number per unit area by the study site's area after correcting for the number of occupied burrows. Longlines and submersibles provided significantly different estimates of tilefish populations, the only species for which estimates could be compared. Longline estimates were probably more accurate because errors in area estimation and double counting were evident in submersible data. Longlines were less expensive to operate ($5000 vs. $8000 per day) and they afforded collection of size, age, and sex data on each fish caught. These data were not available from the submersible. Longlines could be used more cost-effectively than submersibles in determining long-term population changes. However, direct observation of fish behavior was not available from longlines, but was from the submersible. Submersibles also provide data on habitat and gear assessment, including deployment, efficiency, bait predation, and potential catch loss during retrieval.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeGulf of Mexicoen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/21422
dc.latitudeen_US
dc.locationTAMUG periodical collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries3633.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectTilefishen_US
dc.subjectYellowedge grouperen_US
dc.subjectPopulationen_US
dc.titleComparison of two techniques for estimating tilefish, yellowedge grouper, and other deepwater fish populations.en_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue89en_US

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