It usually takes 18-25 days for black-shell shrimp to hatch after embracing eggs, but how long it takes to hatch is affected by water temperature. If the water temperature of black-shell shrimp is between 22-24 ℃, it usually takes only about 18 days for them to hatch shrimps. If the water temperature they live in is above 26 ℃, it only takes them 13-15 days to hatch successfully. But when the water temperature is lower than 20 ℃, it takes 20-25 days for them to hatch shrimps. After they mate successfully, it is recommended that breeders use heating rods to keep the water temperature at about 26 ℃, which can not only keep the water temperature in which they live constant, but also speed up their hatching.
2. What are the signs before black-shell shrimp hatchBefore black-shell shrimp eggs hatch, they will become more cautious and will not let other shrimps or other creatures approach them. At this time, breeders should reduce the frequency of changing water and avoid temperature changes, which can also reduce their defense awareness.
In addition, after holding eggs, they will find a hidden place with shrimp eggs in order to ensure that they can hatch shrimps safely. They don't appear easily except in search of food. After the shrimp hatches successfully, they kick the shrimp off their swimming feet.