Crawfish reach adult size in 3-4 months and its life span is 3-8 years long. 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. Eggs have 6 stages of development. Crawfish eggs are typically laid and fertilised in the burrow where they become attached to the swimmerets on the underside of the femaleâs tail. During mating, the male crayfish deposits sperm into the sperm receptacle of the female. The eggs hatch in 2-20 weeks and have the same structure as an adult crawfish. From there, the eggs will be kept under the tail of the female. After mating, the female crayfish lays eggs, which hatch and grow into adult crayfish, at which point the cycle starts again. The hatching period depends on temperature and usually takes about 3 weeks. Many baby crayfish are eaten because they are so small. Crayfish, common in streams and lakes, often conceal themselves under rocks or logs. I donât recommend moving the female as this can stress her out and cause her to drop the eggs. After around four weeks, the eggs will hatch and the young crayfish will emerge. Developing eggs increase in size, and change from a light color to dark as they mature. The hatchlings stay attached to the female and molt every two to seven days, depending on species. After the third molt, when they reach approximately one-half â¦ The crayfish life cycle begins when a male and female crayfish mate. If you are breeding crayfish at home for the first time, you may want to take some notes. The eggs hatch in about 2-20 weeks. They leave the motherâs protection in about 2 weeks and are very tiny, which makes them susceptible of being eaten. 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. A small crayfish emerges which has all the same structures of an adult crayfish. The eggs, attached to the femaleâs abdomen, hatch in five to eight weeks. In some European countries, both native and Eventually, you can see eye spots just before the eggs hatch. Reproduction is sexual and most often occurs in the spring. Crayfish mate in the autumn and lay eggs in the spring. 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. The crayfish will grow and sheds its exoskeleton often. How Your Pet Crayfish Breed. Meanwhile, the females will hatch their eggs in 30 days or so (depending on water temperatures). incubation of crayfish eggs and to obtain early-hatched larvae by increasing water temperature. The crayfish leaves its mothers protection in 1-2 weeks after it hatches from the egg. You can tell they are about to hatch when you can see the baby crays eyes. They are most active at night, when they feed largely on snails, insect larvae, worms, and amphibian tadpoles; some eat vegetation. After 3-4 weeks, depending on the temperature of the tank and what species of crayfish you have, the eggs will hatch. 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 process is called molting. Egg diameter increases from 0.3 mm in stage 2 to up to 1.6 mm in stage 6. Once laid, eggs hatch in as little as 3 weeks at 21 to 24 C (70 to 75 F) and 4 to 5 months at 12 to 15.6 C (53 â 60 F). If you can see some transparency, you know that development is occurring on schedule.