1932 



ANNUAL REPORT, 1931 



51 



TABLE II. 

 Number of Fish or Percentage in Each Weight Class 



*One fish in its fifth year, weighed 163^ ounces and is not shown in the table except in the 

 totals. 



Of the first 100 fish the scales of which have been examined, 53 per cent, 

 were males and 47 per cent, females. Of the 2,000 fish measured, 1,108 (55.4 

 per cent.) were males and 884 (44.2 per cent.) females. The sex was not 

 determined for eight. All of the fish actually dissected (35 to 40 per cent, 

 were so treated) appeared to be sexually mature. 



To summarize, the following facts stand out: 



(1) By far the greater percentage of the fish examined (91.5 per cent.) 

 were under the legal weight limit. 



(2) Of the first hundred fish examined, 98 per cent, were in their third 

 year or older and hence can be definitely considered mature. 



(3) All fish actually dissected appeared to be sexually mature. 



(b) Feeding Experiments with Speckled Trout 



On account of the paramount importance of diet of artificially reared trout, 

 feeding experiments were renewed at the Provincial Government Fish Hatchery 

 at Mount Pleasant during the summer of 1931 and were conducted along lines 

 similar to those of the previous summer. The results, however, were more 

 satisfactory, since the experiments extended over a longer period of time. 



The following abstract of Professor J. D. Detwiler's report on the feeding 

 experiments conducted at the Mount Pleasant Hatchery during the summer 

 of 1931 should be of considerable value to fish culturists: 



Two series of experiments were carried on; one was begun early in June 

 and the second, a supplementary one, during the latter part of July. The 

 former was closed on September 12th and the latter on September 14th. Each 

 series involved 2,000 fingerlings. 



The diets and their constituent proportions were as follows: 



Series I— (1) beef liver 100; (2) beef liver 60 and ration A 40; (3) beef 

 heart 60 and clam meal 40; (4) beef heart 60 and ration B 40; (5) ration B 50 

 and ration C 50; (6) beef melts 50 and ration C 50; (7) hog melts 50 and ration 

 C 50; (8) beef liver 60 and ration D 40; (9) beef liver 60 and ration E 40; (10) 

 ration F 100. 



Series H— (11) beef liver 100; (12) hog melts 60 and clam meal 40; (13) 

 ration F 100; (14) ration E 100. In each series the beef liver was taken as a 

 standard of comparison. 



The percentage mortality and the final results are given in the following 

 table : 



