Freshwater Inflow Effects on Fisheries




Zimmerman, Roger J.

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U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Fisheries Science Center, Galveston Laboratory


Studies were conducted in Texas Bays from 1985 through 1989 to examine relationships between salinity and nursery values of shallow water habitats. The bay systems sampled included: Galveston, Lavaca and San Antonio Bays. Densities of shrimp and other aquatic fauna were compared among marshes, SAV and bare mud substrates exposed to differing salinity conditions. Drop samples and sediment cores were used to measure numbers of demersal and infaunal animals per unit area. Marsh communities of the upper, middle and lower parts in each of the three bays exhibited subsystem attributes related to salinity. Exploitation level can be explained by these attributes. In the lower bays, higher salinites and low turbidities fostered growth and epiphytic algae and their grazers.


pgs. 74-87


fisheries, salinity effects, nursery grounds, shallow water ecosystem