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used for aeration. The bottom should slope slightly 

 toward the outlet to facilitate cleaning and draining, 



b. Each tank should be supplied with plenty of 

 filtered water — spring water is filtered — and each 

 tank should drain directly to the sewer without passing 

 through other tanks. The water should enter the tank 

 through pressure jets placed well above the surface of 

 the water. One overflow outlet should be at or near 

 the bottom to remove stagnant water and waste material. 



c. The tank should be supplied with minnows that 

 are in good physical condition. Minnows that are 

 carefully seined, sorted in floating live boxes, slowly 

 tempered, and transported in adequate equipment will 

 live in the holding tank for a much longer time than 

 those that have not received good treatment. 



d. Each tank should be small enough so that the 

 complete contents can be sold in a few days. No more 

 fish should be added until these are sold, and the tank 

 should never be overloaded. The transfer of fish from 

 one tank to another will greatly aid the spread of 

 disease. 



e. When the fish from one tank have been sold, the 

 tank should be drained and carefully cleaned. The sides 

 and bottom should be thoroughly scrubbed with a 1:10,000 

 solution of sodium hypochlorite. This solution is mixed 

 by adding 1 quart of sodium, hypochlorite or 3 to 5 

 quarts of any commercial bleach to 250 gallons of water. 

 The tank should be thoroughly sterilized at least once 

 a week. After an ample rinse the tank can be filled 

 with water and stocked with fish. 



f. All dead fish in the tanks should be removed 

 immediately and destroyed. 



g. There maybe considerable loss from the common 

 practice of selling minnows wholesale by the gallon. 

 This procedure necessitates the measuring of minnows 

 in a nearly dry state. Such measuring cannot be done 

 without injury to the fish. Hatcherymen usually weigh 

 fish by first filling a metal basket half full of water, 

 weighing the basket and water, and then adding the fish 

 and reweighing. The difference in weight is the weight 

 of the fish. By counting the number offish in a pound, 

 it is possible to determine the number of fish sold. 

 With this method it is possible to wholesale fish by 

 numbers, pounds, or gallons, allowing 8 pounds to the 

 gallon. There is very little injury to the fish during 

 wei ghing. 



h. Very large dip nets should not be used for 

 minnows. Lifting a half bushel of minnows in a dip 



