Finfish Breeding and Hatchery Management (2+1)

Unit 4 - Different types of fish hatcheries

4.3. Glass jar hatchery

• The credit of developing India’s first transparent hatching device in which the developing eggs can be watched at eye level goes to Dr Bhowmick.
  In this system, the hatching is automatically transferred to storage hapa spawnery, within the hatchery building itself.
• The main components of Bhowmick’s glass jar hatchery are : an overhead tank, fish breeding tank, incubation and hatching jars and a spawnery to hold the newly hatched spawn.
• The capacity of the overhead tank is 5,000 l and that of each of 20/40 hatching jars is 6.35 l.
• The spawnery comprises two cement tanks (1.8 x 0.9 x 0.9 m each) which can hold a nylon hapa measuring 1.65 x 0.8 x 1.0m, projected above the tank and hence deeper than the tank and has an overhead shower for spray.
• Each jar can accommodate 50,000 water hardened and swollen eggs at a time. The water flow rate maintained is 600-800 ml/minute.
• This was earlier a very successful system, but the hatchery jars are now obtained against orders only.