Environmental Biology of Fishes

, Volume 24, Issue 2, pp 81–92 | Cite as

Utilization by fishes of shallow, seagrass-covered banks in Florida Bay: 2. Diel and tidal patterns

  • Susan M. Sogard
  • George V. N. Powell
  • Jeff G. Holmquist
Full paper


Diel and tidal patterns in the occurrence of water column fishes were examined on four shallow banks in Florida Bay, using continuous 72h gillnet sets. Patterns in capture rates were presumed to indicate movement of fishes on and off the seagrass-covered banks. Species that were nocturnally active on the banks included Arius felis, Mugil gyrans, Opisthonema oglinum, Harengula jaguana, Elops saurus, Lutjanus griseus, and Bairdiella chrysoura. Diurnal species included Eucinostomus gula, Lagodon rhomboides and Mugil cephalus. Strongylura notata and Mugil curema showed no consistent patterns. At the two sites with significant tidal fluctuation in water level, different activity patterns on the bank relative to tidal stage were evident for several species. At extreme low tides, water column fishes apparently left the banks to avoid stranding. Cycles of fish utilization of the bank habitat are proposed to be related to both availability of prey (diel patterns) and water level (tidal patterns). These cycles in turn influence activity patterns of predators foraging on these fishes.

Key words

Activity patterns Gillnets Estuaries 


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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Susan M. Sogard
    • 1
  • George V. N. Powell
    • 1
  • Jeff G. Holmquist
    • 1
  1. 1.National Audubon Society Research DepartmentTavernierU.S.A.

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