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Faxonius shoupi, the Nashville crayfish, is a freshwater crustacean native to the Mill Creek Basin in Nashville, Tennessee. [2] Prior to August 2017, the species was called Orconectes shoupi . [ 4 ] Faxonius shoupi is protected under the Endangered Species Act (ESA) as an endangered species.
Gestation of the eggs takes about nine months, with females carrying the eggs on their tail through winter. After hatching in mid-summer, the hatchlings of about 6 millimetres (0.24 in) attach to the female's swimming legs and will remain with the mother until a few months later in autumn.
The crayfish then reproduce for the first time during the "midsummer of the third or fourth year." The Guyandotte River crayfish are an egg-laying species. [4] After their first time reproducing, they continue to mate annually until their death. Eggs are typically laid in the late summer or fall, and then hatch in the spring. [4]
The lifecycle of the signal crayfish is typical for the family Astacidae. Around 200 to 400 eggs are laid after mating in the autumn, and are carried under the female's tail until they are ready to hatch the following spring. [3] The eggs hatch into juveniles, which pass through three stages (two moults) before leaving their mother.
The eggs hatch 2–20 weeks after they are laid. [13] A young crayfish emerges from the egg with all the same structure of an adult crayfish. Not every egg produces a young crayfish, as upwards of 60% of the eggs are deficient due to genetic problems. One to two weeks after it hatches, the young crayfish leaves its mother.
Pacifastacus fortis (known as the Shasta crayfish or placid crayfish) is an endangered crayfish species endemic to Shasta County, California, where it is found and first described in 1914, only in isolated spots along the Pit River and Fall River Mills. [4]
It is commonly called crayfish in Australia and New Zealand and kōura in Māori. [3] They resemble lobsters , but lack the large characteristic pincers on the first pair of walking legs. Spiny rock lobsters are carnivorous , leaving their rock cover to venture out to feed during the night.
They have also been known to use abandoned crayfish burrows as a place to house their eggs. The female produces numerous clutches of eggs throughout breeding season, however not much is known of the number of clutches that they produce. Each clutch generally contains anywhere from 75 to 200 eggs.