Floating Hapas for Fishes

• Floating hapas are an improvement over the conventional hapas.
• It is similar to a conventional hapa. But, it is mounted on frames which are made up of polythene or aluminum pipes.
• These are designed to cope with the rise and fall in the water level.
• These can be easily fixed even in rocky areas without bamboo poles. They can also be fixed in deeper areas so that mild water current passes through the hapa. This helps in better exchange of water and aeration.
• Floats are fixed to the hapa for floating. It is tied to fixed objects with long ropes so that it will not be carried away by the current.
• It is collapsible and can be assembled very easily. The size of outer hapa is 2 x 1 x 1 m and that of the inner one is 1.75 x 0.75 x 0.5 m.
• The hatching percentage is 50-70%.
• Silt may get deposited in the hapa which causes mortality of the spawn is the major disadvantage.
• It may be dispositioned due to the movement of water and rearranging is time consuming.