For hatching, the tanks are stocked at the rate of 800,000 to 1000,000 eggs/tank. Hatching takes place in about 12 to 17 hours at 27 to 30°C Ideal salinity level for hatching is 20 to 30 ppt.
Newly hatched larvae of L. calcarifer measure 1.5 mm in length They have a big yolk sac containing a large oil-globule, which enables the larvae to float at the surface with their head raised to a 45 to 90° angle. The body is slender and pale in colour. The eyes, alimentary canal, anal opening and caudal fins can be distinctly seen but the mouth remains closed up to the third day of development. The yolk gets almost fully absorbed by the third day.