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Atlantic sturgeon Acipenser oxyrinchus surfacing behaviour.

L M Logan-Chesney1, M J Dadswell1, R H Karsten2

  • 1Department of Biology, Acadia University, Wolfville, NS, B4P 2R6, Canada.

Journal of Fish Biology
|February 22, 2018
PubMed
Summary
This summary is machine-generated.

Atlantic sturgeon surfacing behavior is linked to shallow waters and tidal cycles in Minas Basin. This surfacing, possibly for buoyancy control, occurs most frequently during flood tides and at night.

Keywords:
buoyancy controldepth effectspop-up archival tagssurfacing frequencyswim speedstidal effects

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Area of Science:

  • Marine Biology
  • Ichthyology
  • Animal Behavior

Background:

  • Atlantic sturgeon (Acipenser oxyrinchus) are a critically endangered species.
  • Understanding their behavior is crucial for conservation efforts.

Purpose of the Study:

  • Investigate the surfacing behavior of Atlantic sturgeon in Minas Basin and the Bay of Fundy.
  • Determine factors influencing surfacing frequency and patterns.

Main Methods:

  • Pop-up satellite archival tags (MiniPAT) were used to track six Atlantic sturgeon.
  • Tags recorded physical variables like pressure, temperature, and light.
  • Data analysis focused on surfacing events in relation to depth, tidal cycle, and time of day.

Main Results:

  • Surfacing events were most frequent (78.9%) in shallow waters (<10m) of Minas Basin.
  • Surfacing decreased significantly in deeper waters (>40m) of the Bay of Fundy.
  • A strong correlation was found between surfacing and the flood tide (49.5% of events).
  • Peak surfacing activity occurred between 2300 and 0300 hours.

Conclusions:

  • Atlantic sturgeon surfacing behavior is influenced by water depth and tidal cycles.
  • Buoyancy control, achieved by gulping air, is proposed as the primary driver for this behavior.
  • Findings provide insights into the ecological needs of Atlantic sturgeon in this region.