Life history notes of the critically endangered dwarf sawfish, Pristis clavata, Garman 1906 from the Kimberley region of Western Australia
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The dwarf sawfish, Pristis clavata, was captured in marine waters of King Sound and estuarine waters of the Fitzroy, May and Robinson Rivers, in the Kimberley region of Western Australia. Observations of sexual maturity and annuli present on vertebrae suggest that the estuarine waters of at least the Fitzroy River act as a nursery for the species, where immature individuals may remain for at least 3 years. The capture of immature individuals in excess of 2,330 mm TL during the current study in addition to Peverell’s (Peverell in Environ Biol Fishes 73:391–402, 2005) record of a mature male measuring 3,060 mm TL implies that the species may attain far greater lengths than previously reported and that the common name may not be entirely appropriate. In contrast to the sympatric freshwater sawfish Pristis microdon, the number of rostral teeth of individual P. clavata can not be used to differentiate males from females, with both sexes possessing an average of 42 rostral teeth.
KeywordsBiology Age and length Diet Conservation Pristidae
We greatly appreciate the financial support provided by the Natural Heritage Trust, Department of Fisheries Government of Western Australia and Murdoch University. Thanks also to the Kimberly Land Council, the Kimberley Language Resource Centre, Department of Conservation and Land Management and the people of the west Kimberley for helping with the project.
- Compagno LJV, Last PR (1998) Order pristiformes pristidae sawfishes. In: Carpenter KE, Niem VH (eds) FAO species identification guide for fisheries purposes. The living marine resources of the western central pacific., Volume 3, Batoid Fishes, Chimaeras and Bony Fishes Part 1 (Elopidae to Linophrynidae). FAO, Rome, pp. 1410–1417Google Scholar
- Conrath CL (2004) Reproductive biology. In: Musick JA, Benfil R (eds) Elasmobranch fisheries management techniques. APEC Fisheries Working Group, pp. 133–164Google Scholar
- Goldman KJ (2004) Age and growth of elasmobranch fishes. In: Musick JA, Benfil R (eds) Elasmobranch fisheries management techniques. APEC Fisheries Working Group, pp. 97–132Google Scholar
- Ishihara H, Taniuchi T, Sano M, Last PR (1991) Record of Pristis clavata Garman from the Pentecost River, Western Australia, with brief notes on its osmoregulation, and comments on the systematics of the Pristidae. University Museum, University of Tokyo, Nature and Culture 3:43–53Google Scholar
- Last PR, Stevens JD (1994) Sharks and rays of Australia. CSIRO, AustraliaGoogle Scholar
- Morgan DL, Allen MG, Bedford P, Horstman M (2004) Fish fauna of the Fitzroy River in the Kimberley region of Western Australia – including the Bunuba, Gooniyandi, Ngarinyin, Nyikina and Walmajarri Aboriginal names. Rec West Aust Mus 22:147–161Google Scholar
- Pogonoski JJ, Pollard DA, Paxton JR (2002) Conservation overview and action plan for Australian threatened and potentially threatened marine and estuarine fishes. Environment Australia, CanberraGoogle Scholar
- Stevens JD, Pillans RD, Salini J (2005) Conservation assessment of Glyphis sp. A (speartooth shark), Glyphis sp. C (northern river shark), Pristis microdon (freshwater sawfish) and Pristis zijsron (green sawfish). Report to the Australian Government Department of the Environment and HeritageGoogle Scholar
- Thorburn DC, Peverell S, Stevens JD, Last PR, Rowland AJ (2003) Status of freshwater and estuarine elasmobranchs in northern Australia. Report to the Natural Heritage TrustGoogle Scholar
- Thorburn DC, Morgan DL, Rowland AJ, Gill HS (2004) Elasmobranchs in the Fitzroy River, Western Australia. Report to the Natural Heritage TrustGoogle Scholar
- Thorburn DC, Morgan DL, Rowland AJ, Gill HS (2007) Freshwater sawfish Pristis microdon Latham, 1794 (Chondrichthyes: Pristidae) in the Kimberley region of Western Australia. Zootaxa 1471:27–41Google Scholar