202 



American Fisheries Society 



which latter is uniformly 48° F. During ithe winter months the temperature 

 is somewhat lower than during the summer. 



C. Supply of spring brook water, temperature ranging from 38° 

 to 46° F. 



D. Supply from a trout stream of which the temperature ranges 

 from 34° to 42° in the winter months, and from 38° to 58° in April 

 and May. 



Development of 

 Date. 



Brook trout : 



April I . . . 

 May I . . . 

 August 3 1 . 

 September 30 

 October 31 . 



Brown trout: 

 April I . . , 

 August 31 . , 

 September 30 

 October 31 . 



Rainbow trout: 

 April I . . . 

 July 2 . . . 

 September 30 

 October 3 1 . 



Brook trout: 



April 13 . . 



May S • • • 



May 31 . , . 



June 30 . . 



August 2 . . 

 September 17 



October 27 . 



Brook trout: 



April 12 • . 



April 28 . . 



Brook trout: 



April 12 . . 



July 19 . . 



August 24 . 



Trout Under Different Conditions of Water Supply 



Tempera- 



Length. 

 Inches. 



Weight per 

 thousand.* 

 Ounces 

 Water Supply A. 



f?4 to 2-7/16 

 syi to 3% 

 3V*i0 3-yA 



65^ t 



214 to 2j4 



3'At0 3}i 



s'A 



2H t0 2^ 



zyi to 3 

 4 to 454 

 4^ to 4J^ 



53 

 80 



333 



1,250 

 2,750 



48 



250 



37S 



1,255 



42 

 80 



500 

 62 s 



ture. 



"F. 



51 

 SI 

 SI 

 SI 



SI 



SI 

 SI 



51 



SI 



51 



SI 



SI 

 SI 



Water Supply B. 



1-3/16 to 1-5/16 

 1-9/16 to I J4 

 2 to 2j^ 



2-5/16 to 2-9/16 

 3^ to 4H 



A,A 



S 



Water 



13/16 to % 

 I to ij^ 



IS 



48 



64 



488 



900 



1,120 



Supply 



s 



8 



47 to SI 



48 to 51 



49 to 53 

 48 to 54 



48 to 53 



49 to 52 

 48 to 5 1 



C. 



40 to 46 

 4S to so 



Water Supply D. 



15/16 to I s 54 to 58 



15^ to 1-13/16 15 54 to 60 



2H to 2-7/16 36 54 to 60 



Days fed. Fish to can. 



Number. Number, 



* Determined from weight of a few average size specimens. 



tOne trout; much fatter and heavier than a wild trout of same length. 



Reference to section A of the foregoing table shows that on 

 April 1st there were fingerling trout of three species ranging in 

 length from 2^ to 314 inches, in contrast with the fish at 



