Culture fisheries in village ponds: a multi-location study in Haryana, India

摘要

The state of Haryana in northeastern India has an excellent sub-tropical climate for thedevelopment of fresh water fish culture in a variety of aquatic bodies. Aquaculture not only playsan important role in nutrition but also in the rural economy of the State. The main purpose of thepresent study was to identify the primary production and fish production patterns in village pondsunder different management practices. With a more or less narrow range of primary production,varying fish production and growth rates were recorded, indicating the influence of a combinationof environmental and management factors. There was no close relation between primaryproduction and fish production in the rural fish ponds of Haryana, India. Sudden and considerablefluctuations in dissolved oxygen concentration and pH impair the proper functioning of othertrophic communities, supported the dominance of decomposition processes, i.e., anaerobiosis,and lead to further degradation and loss of the control functions of the whole water ecosystem.Increased organic load can be considered as a general signal of reaching the instability of aquaticecosystem and decrease of production efficiency The optimum conditions for increased fishproductivity were found to be the adequate DO level (>4 mg L-1) and appropriate pH (6 < pH < 9),low BOD (<1.6 mg L-1) and ammonia (<0.2 mg L-1) and optimum plankton population(approximately 3000-4500 Nos. L -1).