Sawfishes

Sawfishes

Cartilaginous Fish

SCIENTIFIC CLASSIFICATION

COMMON NAME: sawfish
KINGDOM: Animalia
PHYLUM: Chordata
CLASS: Chondrichthyes
ORDER: Pristiformes
FAMILY: Pristidae
GENUS SPECIES: No data

FAST FACTS

DESCRIPTION: These animals have a flattened extension of their upper jaw, which can be longer than 2 m (6.5 ft.) and more than 30 cm (12 in.) broad. This snout or rostrum is lined with a row of sharp teeth on each side.
MALE External claspers located on the far underside of the body - forward of the caudal fin - distinguish males.
SIZE: In rare instances, sawfish can reach a size up to 6 m (20 ft.)
WEIGHT: No data
DIET: Schooling fish and bottom-dwelling, aquatic invertebrates
GESTATION: Ovoviviparous ("egg live birth")
CLUTCH SIZE No data
PLANKTONIC DURATION No data
SEXUAL MATURITY: No data
LIFE SPAN: No data
RANGE: Sawfish are commonly found in tropical seas and in estuary mouths. The smalltooth sawfish (Pristis pectinata) is found in tropical Atlantic waters while other species inhabit the Indo-Pacific region. The freshwater sawfish (Pristis microdon) also inhabits freshwater rivers and waters around Australia.
HABITAT: In shallow waters and adjacent estuaries or freshwater rivers or lakes
POPULATION: GLOBAL No data
STATUS: IUCN 5 species listed as Endangered,
2 species as Critically Endangered
CITES Not listed
USFWS Not listed

FUN FACTS

1. Sawfishes are a group of about 6 species of carnivorous fishes found in the superorder Batoidea. Sawfishes are in the same superorder as rays, skates, and guitarfishes, and in the same class (Chondrichthyes) that also includes sharks and chimaeras. Chondrichthian animals have a skeleton made of cartilage instead of bone.
2. Sawfishes can be confused with saw sharks (order Pristiophoriformes), but there are some recognizable differences between them. Sawfishes have 5 pairs of gill slits located on the ventral side of their bodies while saw sharks have gill slits on their sides. Saw sharks also have rostrum teeth alternating in size from large to small, and long, fingerlike barbels hang from their rostrums. Sawfishes have no hanging barbels and their snout teeth are generally uniform in size.
3. The tooth-lined rostrum of the sawfish can function as a defensive weapon, but it is mostly used to gather food. The sawfish may swing its rostrum back and forth while swimming through a school of fish, stunning them. The mouth of a sawfish is under its body - this positioning allows the animal to eat injured fish that sink to the bottom. Sawfish have also been seen using their snout teeth to root in sediment in search of invertebrates.
4. For more information about sharks & rays, explore the Sharks & Rays InfoBook.

ECOLOGY AND CONSERVATION

Smalltooth sawfish are generally regarded as gentle and harmless to humans, but they have been known to cause serious injuries if trapped by fishing hooks or nets. Sometimes fishermen consider these animals a nuisance. Sawfish may damage their nets to get to the captured fish inside them. Sawfish are killed for their tooth-lined snouts, which are sold as souvenirs, although the smalltooth sawfish is fully protected by law in the United States.

BIBLIOGRAPHY

Wheeler, A. Fishes of the World. New York. MacMillan Publishing Co., Inc. 1975.

fishbase.org

flmnh.ufl.edu/fish/organizations/ssg/ssg.htm (IUCN Shark Specialist Group)