Circular Cisternae Hatchery for Fishes

• It has a drum which is made up of a galvanised iron sheet with one metre diameter and one metre height.
• At 5 cm above the bottom of the drum an inlet pipe is fixed at an angle of 45°. The inlet pipe is connected with the main water supply. Near the inlet a check valve is fixed to regulate the incoming water flow into the drum.
• The inlet pipe creates water circulation inside the drum. The surplus water goes out through the outlet, which is fixed at the top of the drum.
• The eggs are kept in the drum, and due to the water circulation the eggs are also circulated.
• A monofilament cloth with 60 mesh / inch at the outlet prevents the escape of eggs. After the hatching the egg shells get disintegrated and escape along with the surplus water.
• The hatchlings are found inside the drum and these are collected later.
• Due to the circulation of water, plenty of dissolved oxygen is available to eggs and hatchlings. The percentage of hatching is about 90%.