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Movements, recapture patterns and factors affecting the return rate of Carcharhinid and other sharks tagged off northern Australia

Created 24/06/2025

Updated 24/06/2025

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Between February 1983 and May 1985, ~10 500 sharks of 23 species were fin-tagged off northern Australia. Tagging concentrated on the commercially important Carcharhinus tilstoni and C. sorrah. Most recaptures were made in 1984 and 1985 but returns continued until May 1997. In all, 579 tages (5.5%) were recovered. Tag shedding was estimated to be low (0.025 per year for C. tilstoni) and tagging mortality was significantly lower for sharks caught by hand line than by gill-net. Australia gill-netters, Taiwanese gill-netters (fishing in the Australian Fishing Zone) and Australian prawn trawlers accounted for most of the returns. THe maximum distance between the release and recapture positions was > 1100 km, but most returns were made within 50 km of the tagging site. Nearly all the releases were in inshore waters fished by Australian vessels. Although many recaptures were made by the offshore Taiwanese fisher, the Taiwanese fishing effort was much higher than for the inshore Australian fishery, so that releative to fishing effort, relative few sharks moved from inshore to offshore waters.

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Additional Info

Field Value
Title Movements, recapture patterns and factors affecting the return rate of Carcharhinid and other sharks tagged off northern Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/281c8463-78ba-4eff-957e-45e3d78b51f4
Contact Point
Australian Ocean Data Network
john.d.stevens@csiro.au
Reference Period 01/01/2000 - 01/01/2000
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        122.02,
        -17.93
      ],
      [
        128.17,
        -17.93
      ],
      [
        128.17,
        -13.16
      ],
      [
        122.02,
        -13.16
      ],
      [
        122.02,
        -17.93
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "Movements, recapture patterns and factors affecting the return rate of Carcharhinid and other sharks tagged off northern Australia". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/movements-recapture-patterns-and-factors-affecting-the-return-rate-of-carcharhinid-and-other-sh