Titcomb. — Some Fish-Cultural Notes 201 



stance there are three specimens where one had swallowed his 

 mate tail first up to the head, when a third one came along and 

 swallowed the second one by the tail; so we have three heads 

 and three pairs of shining golden eyes in a line, and one tail. 



VARIATION IN GROWTH OF TROUT UNDER DIFFERENT 

 QUALITIES AND TEMPERATURES OF WATER 



Years ago the American Fisheries Society adopted the plan of 

 describing the fingerlings as No. 1, No. 2, No. 3, etc., according 

 to size of the fish, a one-inch fish being called "No. 1 fingerling," 

 a two-inch fish "No. 2 fingerling," and so on. That method of 

 nomenclature gives opportunity for considerable range, but it 

 does not tell the story as accurately as can ocular demonstra- 

 tion. In connection with the bottle specimens of trout which 

 are exhibited, I may say that each foreman who distributed 

 trout was requested to preserve specimens periodically in con- 

 nection with shipments. Special labels were furnished calling 

 for data to be filled out with pencil and placed inside of each 

 bottle before mailing it; upon receipt, the labels are afiixed on 

 the outside of the bottles. The labels call for the weight per 

 thousand fish, date, number of fish carried to a ten-gallon can, 

 and the number of months the fish have been fed. 



A table has been prepared based upon the information ob- 

 tained from available bottled specimens. Had the specimens 

 been secured for the purposes of compiling the table, an effort 

 would have been made to have the dates of collection corres- 

 pond at all hatcheries, a practice which will hereafter be 

 adopted. The four different conditions of water supply are 

 as follows: 



A. Supply derived partly from driven virells at a uniform tempera- 

 ture of 52° F., supplemented from surface springs more or less exposed 

 to the air and therefore varying slightly in temperature. No complete 

 record of temperatures has been kept at the hatchery, but the foreman 

 reports that it will average about 51° F., which has been entered in the 

 tables to enable comparison with other entries. 



B. Supply is from a spring covering about one-eighth of an acre 

 in area, with the resultant variation in temperature from that of the source, 



