Early Life History of Spotted Seatrout (Cynoscion Nebulosus) and Gray Snapper (Lutjanus Griseus) in Florida Bay, Everglades National Park, Florida
Abstract:This report describes information on distribution, habitat, and relative abundance of spotted seat rout and gray snapper in Florida Bay, Everglades National Park. Larvae were sampled from 1982 to 1984 in channels, passes and creeks bordering Florida Bay and juveniles were sampled from 1973 to 1976 and from 1982 to 1985 in mangrove creeks, channels, shorelines, banks, basins, and bays. Spotted seatrout were found to spawn predominantly in western Florida Bay. Spotted seatrout larvae were caught in marine salinities during every month but October and January with peaks in June to Septem ber. Juvenile spotted seatrout were collected mainly in mixed species of seagrass beds (Thalassia testudinum, Halodule wrightii, and Syringodium filiforme). Juveniles were most abundant in western Florida Bay mixed species seagrass beds of 1,000–4,000 shoots/m2, where the percent organic mater and density and biomass of S. filiforme were higher than in areas without spotted seatrout. Gray snapper spawn outside of park waters. They enter Florida Bay as post larvae and small juveniles, inhabiting seagrass beds in banks, basins and channels, and mangrove prop roots. Juvenile gray snapper were most abundant in Florida Bay mixed species seagrass beds of higher densities of Halodule and Syringodium than other areas sampled. Monthly mortality rates of juvenile spotted seatrout 16–144 mm SL (A = 34.7%) and juvenile gray snapper 72–116 mm SL (A = 39.5%) were estimated using catch curve analysis of length frequencies.
Document Type: Research Article
Publication date: 1989-01-01
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