Reproduction, movements, and apparent population dynamics of the Atlantic Threadfin Polydactylus octonemus in the Gulf of Mexico.

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dc.acquisition-srcen_US
dc.call-noAcc# 3726en_US
dc.contract-noen_US
dc.contributor.authorDentzau, M.W.en_US
dc.contributor.authorChittenden, M.E., Jr.en_US
dc.contributor.otherFishery Bulletinen_US
dc.date.accessioned2010-02-15T17:04:05Z
dc.date.available2010-02-15T17:04:05Z
dc.date.issued1990en_US
dc.degreeen_US
dc.descriptionp. 439-462en_US
dc.description-otheren_US
dc.description.abstractTrawl collections were made for Atlantic Threadfin Polydactylus octonemus from 5 to 100 m in the Gulf of Mexico along a cross- shelf transect of Texas during October 1977- August 1981. Threadfin generally mature at 165-210 mm TL as they approach 7-9 months of age. Spawning primarily occurs in one period, mid- December - mid-March, and spans 45-120 days overall; 90% of successful spawning may occur in only 59% of that period. Threadfin in the northwestern Gulf range from <5 to 27 m depths in the demersal stage but are most abundant at <5 to 16 m. Young-of- the-year recruit in waters <5-16 m when 2-4 months old. Fish begin to disperse to deeper water in early summer and form a positive size gradient from the estuaries seaward. Threadfin in the demersal phase are not abundant in the northwestern Gulf after 9-11 months of age and reach only 15 months there. Observed mean and predicted sizes were 135-165 mm TL at 6 months, 165-215 mm at 12 months. Fitted von Bertalanffy parameters were 2.17-2.92 (K, annual), 195-230 (L) and -0.03-0.08 years (t0). Maximum size in the demersal phase is 230 mm TL in the northwestern Gulf, but more typically only 200-205 mm. Typical life span (tL) is about 1 year but may exceed that if individuals survive in a pelagic stage after spawning. Apparent mean time and cohort-specific total annual mortality rates are 97-100% in the northwestern Gulf. Population dynamics parameters presented are termed apparent because of the unknown effects of recruitment, movements, random variation, gear selectivity, etc. Spawning grounds seemingly lie along the Outer Continental Shelf, slope, or further offshore, and currents of the cyclonic shelf gyre off Texas and western Louisiana transport the young to estuarine and inshore nurseries.en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeFreeporten_US
dc.geo-codeGalveston Bayen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/21516
dc.latitudeen_US
dc.locationGalveston Bay Collection; TAMUG periodical collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeen_US
dc.publisheren_US
dc.relation.ispartofseries3726.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectAtlantic Threadfinen_US
dc.subjectPolydactylus octonemusen_US
dc.subjectpopulation dynamicsen_US
dc.subjectreproductionen_US
dc.subjectreproductive behavioren_US
dc.subjectmigrationsen_US
dc.subjectnatural historyen_US
dc.subjectlife historyen_US
dc.subjectnursery groundsen_US
dc.subjectspawningen_US
dc.titleReproduction, movements, and apparent population dynamics of the Atlantic Threadfin Polydactylus octonemus in the Gulf of Mexico.en_US
dc.typeArticleen_US
dc.universityen_US
dc.vol-issue88(3)en_US

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