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Developing eggs increase in size, and change from a light color to dark as they mature. The male will deposit a sack of sperm on the female who at that point will pass her eggs through the sperm to fertilize them. Egg diameter increases from 0.3 mm in stage 2 to up to 1.6 mm in stage 6. The eggs, attached to the female’s abdomen, hatch in five to eight weeks. I don’t recommend moving the female as this can stress her out and cause her to drop the eggs. They are most active at night, when they feed largely on snails, insect larvae, worms, and amphibian tadpoles; some eat vegetation. The female crayfish will take care of the young for a short period of time, but should be removed after a few days to prevent the fry from being eaten. Crayfish mate in the autumn and lay eggs in the spring. After mating, the female crayfish lays eggs, which hatch and grow into adult crayfish, at which point the cycle starts again. The eggs hatch in about 2-20 weeks. How Your Pet Crayfish Breed. Meanwhile, the females will hatch their eggs in 30 days or so (depending on water temperatures). Reproduction is sexual and most often occurs in the spring. Crawfish eggs are typically laid and fertilised in the burrow where they become attached to the swimmerets on the underside of the female’s tail. During mating, the male crayfish deposits sperm into the sperm receptacle of the female. Eggs have 6 stages of development. Fertilized eggs seem to turn somewhat brown as they develop, and become more and more transparent as the yolk is consumed and the embryo develops. After the third molt, when they reach approximately one-half … The process is called molting. Many baby crayfish are eaten because they are so small. After around four weeks, the eggs will hatch and the young crayfish will emerge. The hatching period depends on temperature and usually takes about 3 weeks. You can tell they are about to hatch when you can see the baby crays eyes. After 3-4 weeks, depending on the temperature of the tank and what species of crayfish you have, the eggs will hatch. In some European countries, both native and Crayfish, common in streams and lakes, often conceal themselves under rocks or logs. incubation of crayfish eggs and to obtain early-hatched larvae by increasing water temperature. It has been reported that different methods can be used for crayfish egg incubation, involving the use of zug-jars, meshed materials, tanks and maternal brooding (Ackefors, 1989; Leonard et al., 2001). The eggs hatch in 2-20 weeks and have the same structure as an adult crawfish. They leave the mother’s protection in about 2 weeks and are very tiny, which makes them susceptible of being eaten. Eventually, you can see eye spots just before the eggs hatch. If you are breeding crayfish at home for the first time, you may want to take some notes. The hatchlings stay attached to the female and molt every two to seven days, depending on species. 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