australian sawfish species
Download
Skip this Video
Download Presentation
Australian Sawfish Species

Loading in 2 Seconds...

play fullscreen
1 / 19

Australian Sawfish Species - PowerPoint PPT Presentation


  • 419 Views
  • Uploaded on

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 )

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Australian Sawfish Species' - emily


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
australian sawfish species2
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

narrow sawfish
Narrow Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - AnoxypristisSpecies - cuspidata

Conservation status

IUCN Red List - Critically endangered

distribution and habitat
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
slide5
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
slide6
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
freshwater sawfish
Freshwater Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - microdon

ConservationStatus

IUCN Red List - Critically endangered, NT fisheries - vulnerable

distribution and habitat8
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
slide9
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
slide10
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
dwarf sawfish
Dwarf Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - clavata

Conservation Status

IUCN Red List - Critically endangered; NT - vulnerable

distribution and habitat12
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
slide13
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
slide14
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
green sawfish
Green Sawfish

Taxonomy

Order - PristiformesFamily - PristidaeGenus - PristisSpecies - zijsron

Conservation Status

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

distribution and habitat16
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
slide17
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
slide18
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
ad