How crabs reproduce and how crabs reproduce

How do crabs reproduce the next generation? They rely on the mother crab to give birth to baby crabs, and each time the mother crab lays a large number of eggs, the number of which can reach more than millions. After these eggs hatch in the belly of the female crab, the larvae can break away from the mother and float around with the coastal currents.

After several shells, they grow into big-eyed larvae, and the big-eyed larvae grow into juvenile crabs after several shells, and the appearance of juvenile crabs is almost the same as that of adult crabs, and then after several shells, they become crabs. Most marine crabs are discharged into the ocean without hatching after their eggs have matured.

River crabs grow in freshwater and reproduce in seawater. After entering fresh water, crab seedlings generally live in rivers and lakes with abundant bait for about 18 months, and their gonads gradually mature. Mature river crabs begin to spawn in the offshore areas where sea and fresh water mix in late autumn and early winter, which is known as reproductive migration.

Soon after mating, the female crab can lay eggs, which are attached to the female's abdominal limb hair in bunches and accumulate on the abdomen until hatchlings hatch. This type of crab is called "egg-holding crab". River crabs can lay tens of thousands to millions of eggs at a time and can lay 2-3 times.

In nature, fertilized eggs can only emerge after 4 months, and the hatching rate can reach about 90%. The newly hatched larvae are small and shaped like daphnias, called flea-like larvae. The flea-like larvae have five molts and grow into crab seedlings (big-eyed larvae) in about 35 days, and the crab seedlings molt again to become larvae.

The crab that has just shed its shell is called the soft shell crab, it is unable to feed and defend against the enemy, and the shell gradually hardens after 1-2 days, and then it gradually moves, and the crab body increases significantly after the shelling. After the crab reproduces, its body quickly ages and dies.

Crabs generally only reproduce once a year, and will only begin to mate when they reach sexual maturity and enter the breeding season, and will enter the peak breeding season from December to March of the following year.

Crabs grow and reproduce in freshwater.

Crabs thrive entirely in freshwater, and they mostly inhabit the rocks of mountain streams. There are also a few crabs, such as ground crabs, that can adapt to life on land, burrowing in damp mud holes, and migrating to the sea during the breeding season.

The vast majority of crabs are omnivorous. Some crabs are carnivorous, such as pike crabs, which can prey on fish, shrimp and molluscs. A small number of crabs, such as the crab, scrape or filter feed on algae and organic debris.

Crabs are oviparous organisms.

Crabs rely on female crabs to give birth to baby crabs, each time the mother crab will lay millions of eggs, and these eggs hatch in the abdomen of the mother crab to form larvae, in the larval stage can be separated from the mother, with the coastal tide to float everywhere, after several shells to grow into big-eyed larvae, big-eyed larvae after several shells to grow into juvenile crabs, juvenile crabs are almost the same as adult crabs, and finally after several shells to become adult crabs.

<>1. Crab breeding, they rely on female crabs to give birth to baby crabs, and each time the female crab will lay a lot of eggs, the number of which can reach more than millions.

2. After these eggs hatch in the belly of the female crab, the larvae can break away from the mother and float slowly along the coastal tide with the cherry ridge. After several shells, they grow into big-eyed larvae, and the big-eyed larvae grow into juvenile crabs after several shells, and the appearance of juvenile crabs is almost the same as that of adult crabs. Most marine crabs are released into the ocean without hatching after their eggs have matured.