54 



American Fisheries Society 



that the proportion of parasitized fish was greater to- 

 wards the end of the season than it was at the begin- 

 ning. In some of the succeeding years this difference 

 was not so obvious. Now with data covering additional 

 years available, it will be interesting to see if the conclu- 

 sion from the observations of former years still holds. 



A calculation of the percentage of fish in which no flesh 

 parasites were found, based on examinations made on a 

 considerable number of fish in the months of July and 

 August in the seven years from 1909 to 1914, inclusive, 

 shows a lesser percentage of nonparasitized fish for Aug- 

 ust than for July, thus indicating a greater degree of 

 parasitism for the month of August in five out of the 

 seven years. This is shown in the following table: 



The result of this calculation, which is based on a suf- 

 ficiently large number of fish presumably to overcome 

 the effect of the very considerable fluctuation in the de- 

 gree of parasitism indicated from year to year, seems 

 to be in accord with conclusions reached from observa- 

 tions on each year's record. Furthermore something in 

 the nature of seasonal variation appears to be indicated. 



The results of examinations of butterfish for flesh par- 

 asites by Mr. Vinal N. Edwards are of interest and are 

 here recorded: 



