Abstract
Eighty-two Glyphis glyphis, one G garricki and two Carcharhinus leucas were caught at six localities in the Adelaide River on 66 gill-netting trips from mid-May to mid-December during 2001, 2003-05 and 2009. Photographs are presented that differentiate these euryhaline sharks. The small second dorsal fin of C. leucas clearly separates it from Glyphis species. The waterline (i.e. junction of dark dorsal and pale ventral colouration) on G glyphis extends just under the eye whereas it extends well below the lower margin of the eye in G garricki. Photographs showing shark bite marks on other species are presented. Because of the presence of G glyphis under 610 mm TL with umbilical scars, it is postulated that Marrakai Creek is a nursery area and an important juvenile habitat of this species especially from September-December.
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Schedule a callMore From: The Beagle : Records of the Museums and Art Galleries of the Northern Territory
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