Are Sawtooth Shark noses worth anything?
Those long snouts with teeth all around the outside?
- Heather HLv 71 decade agoFavorite Answer
Sawshark or Sawfish? I think you mean sawfish, but i think they both use their "saw" in similar ways.
The sharks typically feed on bony fish, shrimp, squids, and crustaceans, depending on species. They cruise the bottom, using the barbels and ampullae of Lorenzini on the saw to detect prey in mud or sand, then hit victims with side-to-side swipes of the saw, crippling them.
The pristiophoroids look rather like slender sawfishes, but are readily distinguished by a pair of long nasal barbels — resembling a Fu Manchu mustache — hanging from the underside of the 'saw' about mid-way along its length. The saw itself is an extension of the rostral cartilages supporting the snout. The rostral teeth of sawsharks are replaced when broken or lost, unlike those of sawfishes (in which damaged or missing rostral teeth are not replaced). Sawsharks are strongly bottom-oriented, occurring over sand or mud substrates. They apparently use their electrosensitive ampullae of Lorenzini peppering the undersurface of the saw and their highly sensitive nasal barbels to detect buried prey, which they then debilitate with vigorous side-to-side swipes of the rostral saw. Sawsharks have a small, transverse mouth and tiny, cuspidate teeth. Known prey of these sharks includes small fishes (such as gapers and cornetfishes), crustaceans, and squids.
The most eye-catching feature of the sawfish is their saw-like snout, called a rostrum. The rostrum is covered with motion- and electro-sensitive pores that allow sawfish to detect movement and even heartbeats of buried prey in the ocean floor. The rostrum acts like a metal detector as the sawfish hovers over the bottom, looking for hidden food. It is also used as a digging tool to unearth buried crustaceans. When a suitable prey swims by, the normally lethargic sawfish will spring from the bottom and slash at it furiously with its saw. This generally stuns or injures the prey sufficiently for the sawfish to devour it without much resistance. Sawfishes have also been known to defend themselves with their rostrum, against predators (like sharks) and intruding divers. The "teeth" protruding from the rostrum are not real teeth, but modified denticle scales. (The scales of a sawfish have a similar structure to its teeth, confusing the distinction somewhat.)
Despite the freshwater sawfish's interesting mode of food gathering, using its rostrum in a side-to-side slashing motion to dislodge invertebrates from substrate and to stun schooling fishes, little is known about the feeding habits of this species. Reported food items of the freshwater sawfish include the marine catfish Arius graeffei, cherabin (Macrobrachium rosenbergii), shrimp, and small fishes. Additional prey species may include freshwater prawn such as Macrobrachium australiense, M. rosenbergi, and M. handschii.
- yagoubidrisLv 71 decade ago
For them but not for you.