Finfish Breeding and Hatchery Management

Unit 4 - Different types of fish hatcheries

4.4. Transparent polythene jar hatchery

• This hatchery is identical to Bhowmick’s glass jar hatchery except that the breakable hatching jars are replaced by transparent polythene containers.
• Each jar is provided with an inlet pipe and an outlet pipe and escape of eggs from jars is further prevented by an inner mosquito netting container.
• Each jar has its water supply inlet pipe going down almost up to the jar bottom which is of concave type, in hatchery jars.
• The water on reaching the jar bottom is reflected upwards till it finds its exit located at the top of the jars.
• The water in a jar of this type develops greater churning and suspended eggs therein get better oxygenation.
• This is perhaps a superior system than the unidirectional flow pattern of zoug jars.

Indoor transparent (left) and outdoor fiberglass jars (right) used for hatching major carp eggs