questions: query regarding removal of unwanted fishes, insect and aquatic weeds. 
 answers: remove unwanted fishes-1. application of bleaching powder ca(ocl2): 25-30 ppm, toxicity lasts for 7-8 days.
2. repeating netting: drag netting.
3. application of mohua oil cake: 250 ppm, toxicity lasts for 15-20 days.
remove unwanted insect- soap oil emulsion @ 56kg (veg oil)+ 18kg (soap)/ha.
removal of aquatic weeds- pistia- 1. amonia	(1%) aqueous solution, foliar spraying
	                                                2. paraquat (0.2), foliar spraying