Vol. 10, Issue 10 (2021)

Author(s):
Rajanna C and Shivananda Murthy H

Abstract:
Indian aquaculture is rapidly expanding sector and has great demand. The productivity of aquaculture ponds is not stable. Fertilization is the cheapest and simplest means of increasing aquatic productivity though increased phyto and zooplankton population. In present investigation, different organic manures (Cow dung, poultry manure and cowdung+poultry manure) were evaluated for production of zooplankton which is most preferred food for fishes. Among the treatments, the average total zooplankton density over the period was the highest in PM treatment, followed by CD+PM treatment and CD treatments. The important zooplankton encountered in the various treatment during the experimental period belonged to the groups rotifer, Cladocera, copepod, Ostracoda, crustacean eggs and larval forms. The rotifer were found to be the most dominant group in all the treatment. The group next in abundance was Cladocera, followed by copepod and larval forms. The group Ostracoda were encountered to a lesser extent.