Ornamental Fish Production and Management

3.2.1 Equipment and accessories needed by large scale ornamental fish production unit

3.2.1 Aeration Devices

If ornamental fishes are mass reared in pond systems, good aeration facilities are very much essential. Various aeration devices are used in aquaculture to oxygenate the water in the culture system. They can be mainly classified as surface aerators, diffuser aerators and turbine aerators. Besides, the water inlet system can also be set up in such a way to facilitate gravity aeration (splash board, race way, transversely corrugated inclined plane etc). Among the various aerators, paddle wheel aerators (a surface aerator type) are readily available in the market at reasonable price (1 HP aerator costs Rs.15,000 to 20,000). Aspirator type aerators are also available in different brand names in global market. For oxygenation of pond bottom, aspirator aerators (air injectors) are efficient. If the depth of the culture system is more than 2m, one can choose aspirator type aerator.