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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Nursery grounds, movement patterns and growth rates of dusky sharks, carcharhinus obscurus: A long-term tag and release study in South African waters
Marine and Freshwater Research, Volume 60, No. 6, Year 2009
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Description
Knowledge of movement patterns of sharks in coastal waters is critical for the structuring of regional management plans. Through a long-term tagrecapture program, 9716 dusky sharks (Carcharhinus obscurus) were tagged and released along the east coast of South Africa. A total of 648 C. obscurus, principally small sharks (<100 cm PCL), were recaptured. Most recaptures were within 100 km of the tagging location in the nursery habitat in KwaZulu-Natal (KZN) with small scale movements occurring throughout the year. Forty-eight C. obscurus undertook movements >200 km that indicated a southerly migration between KZN and Eastern/Southern Cape (E/SC) between June and November. Seasonal northerly migrations were less well defined. The largest southerly and northerly movements were 1323 km and 1374 km, respectively. For sharks moving 1100 km south from their tagging locality in KZN, an increase in displacement occurred between June and September identifying animals beginning their migration to the E/SC. With increasing displacement, there was also an increase in minimum swimming speed. Calculated growth rates of small sharks of 10.311.5 cm year-1 were in agreement with current literature values. Established tagrecapture programs provide an important tool in understanding the ecology of early life-stages of coastal shark species. © 2009 CSIRO.
Authors & Co-Authors
Hussey, Nigel Edward
United Kingdom, Bangor
Bangor University
McCarthy, Ian D.
United Kingdom, Bangor
Bangor University
Dudley, Sheldon F.J.
South Africa, Umhlanga Rocks
Natal Sharks Board
South Africa, Durban
University of Kwazulu-natal
Mann, Bruce Quintin
South Africa, Durban
Oceanographic Research Institute
Statistics
Citations: 70
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1071/MF08280
Study Locations
South Africa