22 Interesting Crayfish Facts

Crayfish are considered delicacies. Many recipes on the Internet contain these animals among the main ingredients. But today you’ll find out that there’s more to them than sources of food for us. This post contains various crayfish info and fun facts.

Crayfish information

First, some information:

  • crayfish have to do with the Crustacean group. This, in turn, belongs to the Arthropods class. Which means that crayfish are related to the following: shrimp, crabs, and krill. They are also the relatives of barnacles and lobsters;
  • there are 3 other names the crayfish goes by. Here you go: mud bug, crawdad, and craw-fish. River crab is another name for this sea creature;
  • let’s take a look at the aspect of a crayfish. First of all, there are differences in appearance between the female and the male. A female crayfish comes with an opening; it’s located between her last 2 pair of legs. Her first 2 swimmerets aren’t developed. These swimmerets are situated after the female’s last legs. In fact a female is also easy to recognize by the eggs on her tail’s underside. A male’s swimmerets have the shape of prongs; also, they’re long. Another thing to differentiate males from females. The former are competitive during the mating season. They also fight among one another for territory;
  • the habitat of crayfish depends on the type of family it belongs to. Two types live in the northern hemisphere. Another family prefers these regions: South America, Australasia, and Madagascar. The name of this family is Parastacidae. Crayfish species also inhabit parts of Europe. North America has more than 330 crayfish species. You won’t find them in Antarctica or Africa;
  • the size of the most common crayfish is 3-4 inches (which is 7.62-10.16 cm). There is, however, a really small crayfish. The name of this fellow is the dwarf crayfish. Large specimens (that is, bigger than the 3-4 inches we mentioned) are also found in the wild. These live in deep lakes;
  • crayfish don’t have just one color. On the contrary. In act these crustaceans can be red, white, pink, and blue. You will also find them in dark brown and sandy yellow. White is the least common color of the six. The most frequent color is red. Blue comes second;crayfish
  • the diet of a crayfish in the wild includes many types of food. This means plants, water birds, and shrimp. These animals’ diet also contains stuff like eels, snails, pikes, and insects. Plankton, fish, and worms are delicious for them, too. The crayfish won’t refuse these, either: cat food and hot dogs;
  • the reproduction stage of crayfish happens in a particular way. The male will put a packet containing its sperm on the belly of a female. Another interesting fact is that this packet will then reach her swimmerets, where it will stay attached. The eggs are going to remain on the female’s tail;
  • the female of a cold water crayfish carries these eggs for more than 4 weeks. Warm water crayfish species keep them for 1 month. The breeding season begins in the spring months. Once the hatching is done, the female crayfish will care for her babies alone. The number of eggs she lays is 80-575. After birth, the offspring stays attaches to its mother’s tail. Maturity is reaches as soon as the hatchling is 1 3/8 inches (3.49 cm). The crayfish reaches its adult size when it’s 4 years old.

Other weird facts

Time for some interesting facts:

  1. the eyes of a crayfish can move independently. Also, they both see well;
  2. a Hydrogeologist is the name of someone studying the crayfish;
  3. this creature can swim backwards;
  4. molting happens for them when June comes to an end. This process means the eating of their former skeletons. After this ends, the animal is able to get back the phosphates and calcium which were in the old skin;
  5. walking is done by going forward;
  6. crayfish fossils of more than 100 million years old were discovered in Australia;
  7. crayfish can grow their legs back in case they lose them. Same goes for their claws;
  8. in captivity, the crayfish can live up to 2 years;
  9. living out of the water is possible. That’s done with the creature’s inner gills;
  10. there are some crayfish that don’t have a pair of eyes. In fact they are colorless, too;
  11. feeding is done at night;
  12. in the wild, crayfish can reach the age of 20-30;
  13. there are various invasive crayfish species. The rusty crayfish is one of them. China has problems with crayfish that eat rice crops there.

Did you change your opinion of crayfish? Drop us a line in the comment section below.


  1. Zach

    May 30, 2017 at 8:04 pm

    How they walk was very enlightening

  2. Charles

    November 1, 2017 at 7:31 pm

    I got pinched by one they hurt so don’t make it mad

  3. Anya

    November 17, 2017 at 1:14 pm

    Hydrogeologist is someone who studies water and earth. An astacologist is someone who studies crayfish.

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