Question: asked about fish feed and manure for plankton production
Answer: feed for new fish or young fish - rice bran: mustard oil cake @ 1:1- 3% to 5 % per body weight of fish
feed after few months(during growth) - use supplimentary or artificial feed depending on the mouth size of fish @ 35 to 5% per body weight
manuring or fertilization - cowdung @ 130 kg per bigha per month or pig manure @ 60 kg per bigha per month depending on the water colour. followed by urea @ 3.5 kg and ssp @ 2.6 kg per bigha per month after 7 days of application of cowdung or pig manure
 green water colour - fertilization required 
for now use