Stock boundaries for spotted seatrout (Cynoscion nebulosus) in Florida based on population genetic structure
2014
Seyoum, Seifu | Tringali, Michael D. | Barthel, Brandon L. | Villanova, Vicki | Puchulutegui, Cecilia | Davis, Michelle C. | Alvarez, Alicia C.
The Spotted Seatrout Cynoscion nebulosus (Sciaenidae) is an estuarine fish of economic importance, commercially and recreationally, in Florida. Harvesting of this fish has been steadily decreasing since the 1950s. In the late 1980s, the Florida Fish and Wildlife Conservation Commission (FWC) implemented a major effort to stop the decline in landings and classified the species as restricted, regulating the importation, transportation, and possession of these fish. Over the period 1981-2012, combined recreational and commercial landings of Spotted Seatrout have been flat, primarily because of regulation of the fishery. In the absence of a well-resolved population genetic structure for the Spotted Seatrout, the FWC has relied on coastal watershed features and reproductive differences among estuaries to demarcate regions for management purposes. ... In the present study we identify three genetic stocks of Spotted Seatrout in Florida waters, each with a unique range: 1) from the western border of Florida to Apalachicola Bay, 2) east of Apalachicola Bay through Biscayne Bay, and 3) from Sebastian Inlet to the northeast border of the state. The genetic patterns observed indicate that little if any contemporaneous reproductive exchange takes place between these stocks and that recruitment usually occurs in the natal estuary. The geographic boundaries that frame the FWC’s periodic stock assessments and other demographic evaluations of Spotted Seatrout are not a perfect match with those of the genetically identified stocks. We recommend that, in its assessments of Florida stock of the Spotted Seatrout, the FWC use the genetic stock boundaries that we describe here.
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