196 FISH CULTUKE. 



them across in barrels, the proportion of water to fish 

 in each being one-third water and two-thirds fish. 

 In order to insure them a due supply of air during 

 the transit, the hole in the side of each barrel is 

 bunged up with a wisp of straw. By the jolting ,of 

 the cart the fish are kept in continual motion, and, 

 while the water is prevented from escaping, it 

 becomes, by being shaken against the straw, sufGi- 

 eiently charged with external air for the purpose of 

 respiration. By adopting this mode of carriage, he 

 nevet loses five pounds' weight out of three thousand 

 pounds transported. 



" The effect which such a change has upon jack 

 appears to be most remarkable, the increase in their 

 weight, after removal, being, in some cases, at the 

 rate of not less than from eight to ten pounds a year. 

 In the year 1856, for instance, Mr. Maltby marked 

 and transferred from the large lake of Boilsfut to 

 that of La Hulpe, forty-five jack, averaging one with 

 another two pounds each; none of them weighing 

 more than three pounds. In eighteen months from 

 the time when they had been thus transferred, many 

 of these same fish were caught by troUing, having 

 attained the weight of from fifteen to twenty pounds, 

 .being at the extraordinary rate above mentioned. 

 "This increase in the size of the jack was so 



