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Rebecca-Lynn Hewson

on 17 January 2014

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Transcript of Crawfish

Key anatomical structures
Crayfish have 2 sets of antennae. One set of long antennae and one set of short. It has 4 pairs of walking legs along with a tail fan; the tail fan is made up of the telson and uropods.
Diet and habitat
Crayfish are omnivores; they eat plants, animals, and decaying organisms. They are nocturnal and eat fish, shrimp, water plants, worms, insects, snails, and plankton. Crayfish live in freshwater water habitats that don’t freeze over in cold conditions.
Common name
Common name for crayfish is crayfish or crawfish; which is popular in the southern US.
Taxonomic classification
Cambarus robustus, Cambarus bartonii, Cambarus acuminatus, Cambarus diogenes are all different genus's of crayfish.
Physiological components
The antennas on crayfish are the sensory structures. They touch and feel things. After crayfish mate, the female carries a cluster of eggs attached to her swimmerets. Swimmerets are the feathery things under the crayfish's abdomen. After the baby crayfish hatch, they will stay on the mother's body for protection until they are big enough to be on their own.
Life cycle
The crawfish lives its life mostly in fresh water areas such as rivers, streams and lakes. They only sometimes come onto land. Their appearance is similar to a small lobster. Their average lifespan ranges from only 2 to 4 years.
Crayfish Anatomy
Reproductive strategies
In the mating process males place a sperm packet on the underside of the female's belly. She curls up her tail and she brings the eggs through the sperm down on to her tail and attaches them to the swimmeretes. Eggs stay on the tail for at least four weeks for warmer water species and much longer for the cold water species. Generally breeding occurs in spring.
Crayfish molt at the end of June. They usually eat their old skeleton in order to recover the calcium and phosphates contained in it.
Interesting facts
Adult size is reached by crayfish in the wild in about 1-2 years. They can live from 2 to 4 years.
During the breeding season, males fight for the right to mate and they may lose a leg or claw. But it will slowly grow back.
The presence of crayfish in the water is a sign of lack of contamination. Crayfish clean the water of detritus and carrion.
Many animals eat crayfish, including fish (like eel, trout, pike, chub, perch), herons, mink, otters, snakes, and people.
Crayfish being cooked.
Very rare blue crayfish
Even more rare than the blue crayfish is the white crayfish.
Common red crayfish
Overall, crayfish
are fairly complex creatures.

Crawfish farming provides lots of job opportunities. For people who farm them, cook them, sell them, research them.
A short video:
Crayfish environment
Crayfish are very alike to lobsters. Except in size. The main difference between crayfish and lobsters is that lobsters are found in the ocean, crayfish are not.
When the water level is low, crayfish will dig a burrow to reach the water level.
Full transcript