304 ON AN EXPEKIMENT IN THE KEEPING OF SALMON 



February 8th, 11.45 a.m. Fresh water 1000 cc. per 15 seconds 

 oea ,, ,, ,, /5 „ 



,, 9th, 10.30 a.m. . . Density of Avater in tank 1*001 



Fresh water 1000 cc. per 35 seconds 

 oea ,, ,, ,, 75 ,, 



,, 10th, 10.30 a.m. . . Density of water in tank TOOS 

 Fresh water 1000 cc. per 47 seconds 

 oea ,, ,, ,, 31 ,, 



,, 12th, 10.0 a.m. . . Density of water in tank TOIG 

 Fresh water 1000 cc. per 60 seconds 

 oea ,, ,, „ 31 ,, 



„ 13th, 10.30 a.m. . . Density of water in tank / "^^P ^"^^'^ 



Temp. 46° F. »Bot. 1-018 



,, 14th .... Density of Avater in tank 1'018 



Fresh water shut off 

 Sea ,, 1000 cc. per 31 seconds 



• ,, 15th . . Two more jets of sea water turned on. (One 



smolt died.) ........ 



„ 16th, 10.0 a.m. . . Density of water in tank 1.027 



The water having now approximately reached the normal salinity of 

 the water in the reservoirs, the siipply was connected up with the 

 general circulation, i.e. nine days after the transference began. The 

 digestive tract of the smolt that died on the loth was found to be 

 quite empty. Feeding on the whole had been fairly good. On 

 February 27th these nineteen smolts were removed to a larger tank. 

 On March 1st the second lot of smolts, thirty in number, were brought 

 from Endsleigh, and placed in fresh water in the tank now vacated by 

 the others. Their transference to sea water was completed in about 

 one-third of the time occupied for that of the preceding lot, and as 

 follows : — 



March 5th . . Fresh water 1000 cc. per 18 seconds 

 oea ,, ,, ,, oo ,, 



„ 6th ..... Density of water in tank 1 007 



Fresh water 1000 cc. per 30 seconds 

 oea „ „ ,, 10 ,, 



„ 7th ..... Density of water in tank 1'015 

 Fresh water supply turned off 

 Sea water 1000 cc. per 10 seconds 



„ 8th ..... Density of water in tank 1*026 



Supply connected up with general circulation. 



The transference of the second lot was therefore completed in three 



