Production of fishes in a subtropical black-water ecosystem: The Okefenokee Swamp

Freeman, B.J.; Freeman, M.C.

Limnology and Oceanography 30(3): 686-692


ISSN/ISBN: 0024-3590
DOI: 10.4319/lo.1985.30.3.0686
Accession: 068500911

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Secondary production by the three dominant fishes inhabiting an acidic macrophyte marsh in the Okefenokee Swamp was 171 kg wet wt ha−1 yr−1. Production was estimated by the instantaneous growth rate and size-frequency methods. The size-frequency method gave higher, presumably more accurate, estimates because it is not affected by nonsynchronous cohort development; also, densities of small, undersampled, individuals could be back-calculated from densities in larger size classes. This estimated production exceeds many values reported for stream and river habitats. It is suggested that such blackwater dystrophic habitats are more productive than previously thought.