82 MAINTAINING FISHES 



concentration of 5 p.p.m. Water soluble terramycin at 

 20 p.p.m. will also suppress bacterial growth. To 

 avoid outbreaks of protozoan and certain worm para- 

 sites during handling the author favors pre- and post- 

 transport treatments with formalin. A thirty-minute 

 dip in a 1 to 8,000 solution is recommended. 



Transport Facilities 



Facilities needed for hauling fishes vary greatly 

 with the species and size of fish, v^th the distance 

 they are to be hauled and the quantity involved. 

 Polyethylene bags (4 to 6 mils) in cardboard boxes 

 have come into general use for shipment of fish by 

 common carrier. The units are usually made the 

 maximum size accepted by the postal service but 

 carry only four to five inches of water. The balance of 

 the space is filled with oxygen. For occasional hauls, 

 especially in cool weather, one pound of fish to three 

 or four gallons of water can be transported limited 

 distances without any special arrangements for aera- 

 tion, etc. The containers should be a scalable type. 

 Cooler boxes made of Styrafoam are very satisfactory, 

 although this type transport faciHty can be greatly 

 improved upon by supplying air with a hand-type 

 automotive pump. 



Next in order of cost and complexity of transport 

 facilities is the sealed tank equipped with a 12-volt 

 agitator. These units may be made in a variety of 

 sizes and of various materials. For hauling in the 

 trunk of an automobile, a tank two feet on each side 

 and one foot deep is a convenient size. Such a tank 

 may be made of heavy duty aluminum or ?4" ply- 

 wood but in any event it should be equipped with a 



