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S.No.Name of chemicalPurpose for which usedRemarks
1Common salt (NaCl)(a)For dissolving sticky layer of cyprinid eggsClean kitchen salt is used for this purpose
(b)For bath treatment against external parasitesIndustrial or coarse salt can be used
2Carbamide [Urea: CO(NH2)2](a)As main component of the solution for dissolving sticky layer of cyprinid eggsPure carbamide is used for this purpose
(b)For prolonging the viability of sperms and thus ensuring better rate of fertilizationCarbamide solution at a concentration of 3–4 g/litre
(c)As a fertilizer to increase plankton production in nursery and rearing tanks 
3Tannin or Tannic acid(a)For dissolving the sticky layer of cyprinid eggs through denaturation of proteinsExtracted from the bark of certain trees
(b)As a bactericide and fungicide for fish eggsThis treatment causes the delaying of larval hatching considerably by hardening the egg shell
(c)For treatment of superficial wounds on brood fish, as a fungicide or disinfectantStrong solution is required
4Formalin (Formaldehyde) (CH2O)(a)For treatment against parasites, fungi, and bacteria 
(b)As disinfectant for cleaning hatchery tanks, equipment, and tools 
5Malachite green(a)For treatment against external parasites, fungi, and bacteria 
(b)As disinfectant for cleaning hatchery tanks and tools 
6Copper sulphate (CuSO4)For treatment against all kinds of parasites and of branchial necrosisHighly toxic. Should not exceed recommended concentrations
7Copper oxychlorine (CuCl2 × CuO)Used against unicellular parasites of small fishSafe to use because of major difference between lethal doses for fish and parasites
8Potassium permanganate (KMnO4)(a) Used against external parasites  
(b) As a disinfectant
9Ethyl alcohol (C2H5OH)As disinfectant for hypodermic syringes and injecting needles 
10Absolute alcoholFor preserving pituitary glands 
11Acetone (CH3 COCH3)For preserving pituitary glands in dry condition (acetone-dried glands)It dehydrates and defattens the glands
12Quick lime or Calcium oxide (CaC)For preventive treatment against harmful organismsUsually used in the preparation of outdoor ponds for fry and fingerlings
13Organic phosphoric acid esters(a)For use as “soft” insecticide against harmful aquatic insects and crustaceans 
(b)To promote the development of rotifers in fry nursing ponds 
14Oxytetracycline (Terramycin)(a)For preventing and controlling bacterial diseases through bath treatment or by mixing in food 
(b)For preventing and controlling bacterial diseases in brood fish by injecting into body cavity 
15Quinaldine or Chinaldin (2–4 methylchinolin)(a)As laboratory solventToxic material; prolonged contact may kill the fish
(b)As tranquillizer
16MS 222As tranquillizer 
17Phenoxy ethanolAs tranquillizer 
18Alkaline protease enzymeFor dissolving egg shells to facilitate hatching 
19Fertilizers (Superphosphate, Ammonium nitrate, etc.)For fertilizing nursery and rearing ponds 

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