546 HEroirr of commissioner of fish and fisheries. 



cavity. Tlie. leugtl) of tlic fish was about 75 inni., that of the parasite 

 400 mill. The greatest breadth, near tlie anterior end, was 6 mm. For 

 the first 75 mm. it was thick and stout, the remainder was sh^'iider and 

 tapered sh)wly to the posterior end, near which the brea<lth was about 

 li mm. Several huge suckers from the lake were examined, but no 

 liguhe were found in them. The water of the lak(! is (piite cold, the 

 tciupciature 40° F. having been found at a depth of 124 feet. 



On July 29, 1 examined a number of suckers collected in Witch 

 Creek. The fish were taken in a seine from a warm branch of the main 

 stream. The temi)erature of the water in which the fish were swimming- 

 was 1)5° F. A school of fish were observed in the warm stream where 

 it joined with a cold stream, 40° F. The fish showed no tendency to 

 enter the cold water, even when frightened by the presence of the seine. 

 Two species of fish were secured from this school, viz : Caiostom us (irdnis 

 and Lcuchcus atrarins. The specimens were all young or half grown. 

 No trout Avere seen in the warm water, although they appeared to be 

 rather abundant in the cold stream. 



The larger suckers were nearly all infested with these parasites; the 

 smaller ones not so much, and the smallest scarcely at all. Of 30 fish, 

 ranging from 14 to 19 centimeters in length, only one or two were with- 

 out parasites. Of 45 specimens averaging about 10 centimeters in 

 length, 15 were infested and 30 were not. Of G5 specimens, averaging 

 about 9 centimeters in length, 10 were infested and 55 were not. Of 

 (12 specimens less tlian 9 centimeters in length, 2 were infested and 60 

 were not. 



I insert the following notes made at the time of collecting: 



1. Fish 19 cm. long, contained 1 piirasite, leugtli 89.5 cm., broadest at anterior end, 



where it measured 15 mm. 



2. Fish 17 cm. long, 1 parasite 27 cm. long, 13 mm. broad near anterior end. 



3. Fish 15 cm. long, 4 parasites, 12, 13, 13, and 20 cm. long, respectively. 



4. Fish 13.7 cm. long, no parasites, 



5. Fish 13 cm. long, 3 parasites. 



6. Two fish 13 and 14 cm., respectively, no parasites. 



7. Fish 11 cm. long, abdominal region llabby and collapsed, a hole beside and a 



little in front of vent from which a parasite had apparently escaped. One 

 free lij^nla was found with the fish when they were brought in. The fish 

 may have been injured in seining. The intestine was congested. 



8. Two fish 10 and 11 cm. long, respectively, more than one parasite in each; put 



in alcohol entire. 



9. Fish 10 cm. long, no parasites. 



10. Two fish 10 cm. long, no parasites, intestine and peritoneum congested. 



11. Fish 10 cm. long, no parasites; intestine and peritoneum black and unhealthy 



looking. 



12. Fish 10 cm. long, one parasite 39 cm, long. 



13. Three fish each 10 cm. long, two with 2 and one with 3 parasites. 



14. Two fish, 8 and 9 cm., respectively, one with 3 and the other wntli 4 paiasites. 



The parasitized fish are perhaps a little lighter in color than the non- 

 parasitized ones. 



