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Australian Sawfish Species PowerPoint PPT Presentation

Australian Sawfish Species Australian Sawfish Species There are 4 known sawfish species in Australian Waters Narrow sawfish ( Anoxypristis cuspidata ) Freshwater sawfish ( Pristis microdon ) Green sawfish ( Pristis Zijsron ) Dwarf sawfish ( Pristis clavata )

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Australian Sawfish Species

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Australian sawfish species l.jpg

Australian Sawfish Species


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Australian Sawfish Species

  • There are 4 known sawfish species in Australian Waters

    • Narrow sawfish (Anoxypristis cuspidata)

    • Freshwater sawfish (Pristis microdon)

    • Green sawfish (Pristis Zijsron)

    • Dwarf sawfish (Pristis clavata)

  • These species occupy niches in marine estuarine

    and freshwater environments


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Narrow Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - AnoxypristisSpecies - cuspidata

Conservation status

IUCN Red List - Critically endangered


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Distribution and Habitat

  • Most widely distributed and abundant sawfish in Queensland waters

  • Favours inshore, coastal, mud and sand foreshores and bays mostly in juvenile stage

  • Large mature animals found offshore to depths of 40m

  • Rarely encountered upstream of river mouths in estuarine water

  • Primarily benthopelagic species


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Description

  • Slender body

  • Green-grey dorsally (top) and pale white ventrally (bottom)

  • First dorsal fin behind start of pelvic fin

  • Rostrum does not narrow towards the tip

    Descriptors

  • 18-22 pairs of teeth not extending onto base of saw

  • Deep fork in caudal fin

  • Smooth skin

    Size

  • Attains a maximum size of 470cm

    Diet

  • Prawns, squid and fish


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Fisheries

  • Commercial trawl, gill net and long line fisheries

  • Recreational line fishery and bait collection using small mesh cast nets and seine nets

  • Indigenous net and harpoon fishing

  • Foreign illegal gill net and line fishing

    Utilisation

  • Meat and fins

  • Rostrum for trophy collectors


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Freshwater Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - microdon

ConservationStatus

IUCN Red List - Critically endangered, NT fisheries - vulnerable


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Distribution and Habitat

  • Inhabits rivers of Princess Charlotte Bay on the east coast and all major rivers of the Gulf of Carpentaria.

  • Extremely low abundances on the east coast.

  • Inhabits fresh and estuarine waters as juveniles and marine waters as adults

  • Adults inhabit inshore waters and rivers during the monsoonal wet season to pup


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Description

  • Large thick bodied sawfish

  • Skin yellowish colour dorsally and dirty cream ventrally on bottom

  • Rostrum narrows towards the tip

    Descriptors

  • 18-22 pair of teeth extending onto base of saw

  • First dorsal fin in front of pelvic fin origin

  • Fork and lobe in caudal fin

  • Rough skin

    Size

  • Maximum reported size 700cm, commonly caught in rivers up to 250cm

    Diet

  • Prawns and fish


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Fisheries

  • Commercial trawl, gill net and long line fisheries

  • Recreational line fishery and bait collection using small mesh cast nets and seine nets

  • Indigenous net and harpoon fishing

  • Foreign illegal gill net and line fishing

    Utilisation

  • Meat and fins

  • Rostrum for trophy collectors

  • Collection of live aquarium specimens


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Dwarf Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - clavata

Conservation Status

IUCN Red List - Critically endangered; NT - vulnerable


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Distribution and Habitat

  • Very low numbers inhabit isolated regions of the northern and western Gulf of Carpentaria

  • Very few reports of capture in the southern Gulf of Carpentaria

  • Inhabits coastal foreshores and embayments mostly as juveniles and marine waters as adults

  • Adults frequent inshore waters throughout the year


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Description

  • Moderately large thick body

  • Olive sandy brown dorsally and pale white ventrally

  • Rostrum tapers distally

    Descriptors

  • 18-22 pair of teeth extending onto base of saw

  • 1st dorsal fin origin over pelvic fin origin

  • No fork in caudal fin

  • Rough skin

    Size

  • Reported to attain at least 150cm, locally caught at 310cm

    Diet

  • Prawns and fish


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Fisheries

  • Commercial trawl, gill net and long line fisheries

  • Recreational line fishery and bait collection using small mesh cast nets and seine nets

  • Indigenous net and harpoon fishing

  • Foreign illegal gill net and line fishing

    Utilisation

  • Meat and fins

  • Rostrum for trophy collectors

  • Collection of live aquarium specimens


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Green Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - zijsron

Conservation Status

IUCN Red List - Critically endangered; NSW – critically endangered; NT Fisheries - vulnerable


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Distribution and Habitat

  • Very low abundances in waters of southern and central Queensland

  • Higher abundances in northern region including the Gulf of Carpentaria

  • Live on muddy or sandy-mud soft bottom habitats

  • Inhabit coastal foreshores and bays mostly as juveniles

  • Inhabit marine waters to a depth greater than 40m as adults

  • Adults known to seasonally frequent inshore waters and rivers during monsoonal months to pup

  • Catches of green sawfish are very low and are highly variable


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Description

  • Large slender body

  • Olive brown-green dorsally and pale white ventrally

  • Rostrum does not narrow at tip

    Descriptors

  • 24-28 pair of teeth

  • Teeth are moreclosely spaced at tip and extend onto base of saw

  • No fork in caudal fin

  • 1st dorsal fin begins behind pelvic fin origin

  • Rough skin

    Size

  • Maximum reported size 730cm

    Diet

  • Prawns and fish


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Fisheries

  • Commercial trawl, gill net and long line fisheries

  • Recreational line fishery and bait collection using small mesh cast nets and seine nets

  • Indigenous net and harpoon fishing

  • Foreign illegal gill net and line fishing

    Utilisation

  • Meat and fins

  • Rostrum for trophy collectors

  • Collection of live aquarium specimens


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