ON THE PRODUCTIVITY OF TWO EXPERIMENTAL FISHPONDS MANAGED WITH TRADITIONAL METHOD OF CHINESE PISCICULTURE

Pond A,6065 square meters in area (approx.9.1 “mow”),in which Mylopharyngodon piceus (Rich.) and Cyprinus carpio Linn.formed the major subjects of culture,received chiefly snails and small bivalves as food.Pond B,3657 square meters in area (approx.5.5“mow”),in which Ctenopharyngodon idella (Val.) being the main subject of culture,received exclusively aquatic plants as food.Net increase in weight of fish within the period of a year was 502 kg per “mow” or 7530 kg per hectare for Pond A,and 200 kg per “mow” or 3000 kg per hectare for Pond B.Data concerning the following are presented for either pond:number of in- dividuals and gross weight for each species on date of planting as well as on date of harvesting;nature and amount of food given in each month; range of water temperature and mean temperature for each month.The plankton situation is to be dealt with in a separate paper.An analysis of the growth rate of the fish crop indicates that there is plenty of room for raising the productivity of either pond.