American Fisheries Society 175 



tul) o'-.. fcvt high, 21/2 feet long, and 15 to 18 inches wide. Tlie 

 c-seiitiid featnre of the apparatns is a small cylinder contain- 

 ing oxygen nnder a pressnre of l-iO atmospheres, the escape ot 

 tlie oxygen l)t'ing regulated lyv a valve. The cvlmder is fastened 

 to tlie l)ott()m oi- lowt'r side of tlic vessel and the oxygen comes 

 otf in small bubbles. The cyliinh'r is made in five sizes, adapted 

 to tlie size of vessel nsed, the length of the jonrney, and the 

 number of fish to be transported. For any cylinder, the escape 

 ^•alve inay be so adjusted that the liberation of the oxygen will 

 continue during the entire anticipated length of the trip. It is 

 claimed l)y the inventor that a tank of two-year-old trout, say 

 40 to 50 iisli. will carry witliout loss in moderate weather for 

 4S lioii rs. The cost of the outfit, with five cylinders, is $100, 

 at wliicli i)rice there must be a very handsome profit. 



The fishes I saw experimented wdth were brown trout up to 

 a foot in length and carp np to a foot and a half in length. The 

 taid\s wci'e in the open air, and the temperature of the air was' 

 <S;;)° fo S5° F. Both lots of fish seemed to be suffering, as thev 

 came to the surface repeatedly and showed labored respiration. 

 A thiclv scum continued to form all over the surface, and had to 

 be removed l)y an attendant from time to time; whether this 

 was due to the green, 'uncoated tanks or to the water I do not 

 know. My impression was that perhaps the oxygen reached 

 the fish in a too concentrated state for their needs. An Italian 

 fisliculturist told me that he had found the apparatus useful and 

 efficient in transporting bass and sunfish; and that the cylinders 

 could lie recharged (in Eome, for example) at an insignificant 

 cost. Tliis same gentleman had recently met a Berlin engineer 

 wlio claimed to have perfected an apparatus which, by liberating 

 ozone ill the water, permits the transi)ortation of fish in re- 

 markably small quantities of water. Thus trout eggs may l)e 

 carried in a vessel containing only as much water by bidk as 

 trout, while carp may be safely transported in a vessel contain- 

 ing 78 per cent fish and only 18 per cent water. The inventor 

 has bo])es of lieing able to carry live salmon from America to 

 Eurotie on the regular ocean steamers. 



