The dissociation of cell from different tissue of C.mrigala was found to very with regard to time and concentration.Tissues like liver and kidney were found to be dissociated completely within 20 and 21 min when treated with 0.125% trypsin,but the time reduced to 16 and 18 min when treateed with 0.25% trypsin,respectively.Similarly,embryos were found to dissociate completely within 20 and 16 min with 0.125 and 0.25% trypsin,respectively.On the other hand,heart,ovary and fin tissue dissociated partly after 30 min with 0.25% trypsin treatment. On contrary,within the same exposure time,tissue of brain and testis partly dissociated with 0.125% trypsin but dissociated completely at 0.25% concentration.