Crawfish

Crawfish also known as crayfish, crawdads, freshwater lobsters, or mudbugs are freshwater crustaceans resembling small lobsters, to which they are related. They are found in bodies of fresh water that do not freeze to the bottom, and which have shelter against predators. Most crayfish cannot tolerate polluted water, although some species such as Procambarus clarkii are hardier.

Anatomy

Crayfish are characterized by a joined head and thorax, or midsection, and a segmented body, which is sandy yellow, green, red, or dark brown in color. The head has a sharp snout, and the compound eyes are on movable stalks. Crayfish are usually about 7.5 cm (3 inches) long.

Diet

Crayfish feed on animals and plants, either living or decomposing, and detritus.

Reproduction

Male crayfish have two testicles that produce sperm, and two sperm ducts that open to the outside through a pair of tiny pores. The female has two ovaries and two oviducts. Some species mate and then the female stores the sperm, later to fertilize her eggs.

See also

• Lobster
• Crustacean
• Freshwater biology

References

Crawfish Resources
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