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Composition of larval, juvenile, and small adult fishes relative to changes in environmental conditions in Florida Bay

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Abstract

We compared (1) ichthyoplankton composition and (2) basin and channel habitat ichthyofauna and seagrass densities between 1984–1985 and 1994–1996 in Florida Bay. Stations and sampling techniques employed in 1984–1985 were duplicated in the 1994–1996 study.Thalassia testudinum, Halodule wrightii, andSyringodium filiforme densities within most of the basin and channel strata sampled in 1994–1996 had decreased by as much as 100%. We did not observe changes in the total density of juvenile and small adult fishes coincident with the reductions in seagrass densities except in the deep-water channel habitats. There was an increase in the proportion of the total ichthyofauna represented by pelagic atherinids, engraulids, and clupeids, particularly the engraulidAnchoa mitchilli, and a concomitant decrease in the proportion represented by canopy-dwelling and morebenthic-dwelling seagrass inhabitants. This suggested a shift toward a planktonic-feeding community. We observed an increase in the density and frequency of engraulid larvae, particularly in the western and Gulf of Mexico portions of Florida Bay, but no significant changes in densities of the commonly collected ichthyoplankton that are demersal as adults (i.e., Gobiidae, Callionymidae, and Blennioidei).Lucania parva, Eucinostomus spp.,Lagodon rhomboides, Floridichthys carpio, Haemulon plumieri, andSyngnathus floridae represented nearly 86% of the juvenile and small adult fish collected in 1984–1985 but represented only 29% of the ichthyofauna a decade later. The distribution of juvenile spotted seatrout had expanded into the central and northeastern basins of our sampling area, perhaps in response to reduced salinities or to the availability of food resources.

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  1. National Ocean Serivce Center for Coastal Fisheries and Habitat Research Beaufort Laboratory, United States Department of Commerce, 101 Pivers Island Road, 28516-9722, Beaufort, North Carolina

    Gordon W. Thayer, Allyn B. Powell & Donald E. Hoss

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  1. Gordon W. Thayer
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  2. Allyn B. Powell
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Thayer, G.W., Powell, A.B. & Hoss, D.E. Composition of larval, juvenile, and small adult fishes relative to changes in environmental conditions in Florida Bay. Estuaries 22, 518–533 (1999). https://doi.org/10.2307/1353215

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