4.4 Article

Tidal amplitude and fish abundance in the mouth region of a small estuary

Journal

JOURNAL OF FISH BIOLOGY
Volume 89, Issue 3, Pages 1851-1856

Publisher

WILEY-BLACKWELL
DOI: 10.1111/jfb.13056

Keywords

acoustic camera; connectivity; schooling; South Africa

Funding

  1. National Research Foundation (NRF)
  2. South African Institute for Aquatic Biodiversity (SAIAB)
  3. Australian Research Council [LE10010059]

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Using an acoustic underwater camera (Dual Frequency IDentification SONar, DIDSON), the abundance and direction of movement of fishes>80mm total length (L-T) in the mouth of a small South African estuary during spring and neap tidal cycles were observed. While the sizes of fishes recorded were consistent across both tide cycles, the number of fishes passing the camera was significantly greater during the smaller neap tides. Schooling behaviour was more pronounced for fishes that were travelling into the estuary compared to fishes swimming towards the ocean.

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