Raft culture: What is raft culture and its Importance in Aquaculture productivity.
Raft culture is one of the commercially important method of intensive aquaculture. Connecting ropes are, used to connect culture ropes to a floating raft rope. Also, in horizontal kelp rope raft culture, they are used to tie together pairs of kelp culture ropes hanging from parallel floating raft ropes.
it is made for the culture sessile invertebrates such as oyster, musscles etc.
Raft culture is a Japanese method originally and this method utilities the techniques of 3D culture of aquatic organism.
The bivalves are allowed free and easy acess to diatoms and phytoplanktons which are the natural food so that they can grow fast.
Raft is the most dashing rectangular design and it is in a flat structure for support or transportation over the water.
Raft are usually kept a float by using any combination of floatable material such as wood and barrels etc.
Raft are the rectangular wooden frames floating floating on the water. They are made of bamboo and made to flows by empty dumps.
Raft are kept in a place of undone the string of opats are suspended from the farms.
Raft culture is commonly used method through out the world.
Line of rope, mesh shocks are seeded with young spat(seed) which are suspended vertically from the craft.
length of the rope depends upon the depth of the water and the food availability.
The method consist of surrounding rope or wire from raft on the surface and the rope hanged down to the bottom.
Generally the raft are made up of bamboo meassing 16X25m in size and drag or barrels are used as floaters.
The rope or wire are 10m long is ideal and each numbering 500-600 are suspended from one raft.
FACTORS CONSIDERED FOR RAFT CULTURE.
Naturally clam water centered from strong winds and waves.
Water temperatures ranges with 15-30 degree C.
Water of the area must be completely changed by water current and regular types.
Water stains ranges from 25-28ppm.
Water should be rich in Phytoplanktons.
