crab belongs to the type of arthropods, crustaceans subtype, old kraboidovyh.Outwardly, this looks like a crab, and on the taxonomy of cancers close to the hermit.It lives in Japan, the Bering and Okhotsk seas.Can migrate to the Barents Sea.
crab - the most impressive in size among crustaceans.The main parts of the body are cephalothorax covered by armor, and abdomen (abdomen).The female differs from the male more developed belly.It has no tail.No internal skeleton, too, fulfills its role shell, further protecting it from enemies.
Gills are located under the armor on the sides of the heart - in the back, the stomach - in the head.The shell of the stomach, there are 11 large spikes, and just above the heart 6. crab well reviewed 4 pairs of legs, and the fifth pair hidden under the shell.It is not to move, and to clean the gills.The front pair of legs claws are most developed.The right claw crab uses for breaking the shells of mollusks and shells of sea urchins, and left - cutting marine worms.
crab has dark red with a violet shade shell, for this it is called red.The inside of the shell is yellowish white.The weight of a large male can reach 7 kg carapace width - 28 cm, the average magnitude of feet - 1.5 m. To live up to 20 years may, if they do not get caught and do not eat.The enemies are the people, octopus, gobies, cod, sea otters, and others.
Kamchatka crabs annually pass through the same route to migrate.They spend the winter at a depth of about 250 m, and the spring move in shallow water to reproduce and shed.In autumn go back to deep water.Change the water temperature is a signal to move.Crabs do not move alone, they moved many thousands, hundreds of thousands.And the large males are kept separate from the young and females.Over the year crabs wound up 100 kilometers on the seabed.
Adult crabs molt 1 time per year.Molting takes 3 days, these days males are hiding under rocks, buried in pits.Along with the armor they have updated the intestine, esophagus, stomach wall, tendon.
Replacing the shell, the female releases eggs (eggs can be from 20,000 to 445,000) under the abdomen.Her she is carrying 11.5 months.The next year, moving in shallow water, the larvae emerge from the eggs, and females continue moving.The female lays eggs 1 time a year, and the male can mate with several females during the breeding season.
Kamchatka crabs mature late, females reach sexual maturity at 8 years old, and males - 10 years.Unusual their courtship ritual.Claws holding each other, they can stand for 3-7 days.Female male assists in the process of molting, then mating takes place.
larvae survives slightly, about 4%.At first, the larva swims in the water, and moved by the movement of the jaws.Then it settles on the bottom, living in the algae.Only three years, she leaves the habitat, having shed several times.Migrate starts in 5-7 years.
crab - the object of a viable fishery, but in recent years because of the limited cut their numbers.Crab meat - a valuable dietary product, delicacy, containing vitamins A, PP, C, group B and minerals.The most valued right claw.Carapaces and viscera are also in the matter of them make excellent fertilizer.
