126 



BULLETIN OF THE BUREAU OF FISHERIES. 



Sarrfti Simla. Bonito. 



Woods Hole, Mass., 1905. — July 24, five fish examined. July 27, one fish 

 examined. Numerous cysts were found in the stomach wall of two, and few in 

 each of the others. 



Alutera sehapji. Filefish. 



Woods Hole, Mass., 1905. — Aug. 7, one. Cysts in walls of stomach and intes- 

 tine. Associated with cysts containing a larval Dibothrium. 



Paralichthys dentatus. Summer Flounder. 



Woods Hole, Mass., 1905. — Aug. 18, two. Cysts found in stomach wall and in 

 mesentery, associated with cysts of Tefrarhynchus bisuhatus. 



EFFECT OF THE PRESENCE OF CYSTS ON WEIGHT OF HOST. 



In order to ascertain how much, if any, the weight of fish was affected by the 

 presence of cysts in the flesh, the following weights were obtained of fish belonging 

 to the lot which was examined on August 26, 1904. 



1. Three fish were chosen with care so as to agree with three others of equai 

 length and depth. The length of these fish was 215, 215, and 200 millimeters, 

 respectively. Three of these fish, each of which had very numerous cysts in the 

 flesh, together weighed 672 grams; three others of similar dimensions, but with 

 relatively few parasites, weighed 686 grams. 



2. Another lot of three fish, each 200 millimeters in length, each with very 

 numerous cysts in the flesh, together weighed 644 grams; tlu-ee others chosen so 

 as to agree in length and depth with them, but with less numerous parasites, 

 weighed 658 grams. 



3. Three fish measuring 190, 200, and 210 millimeters, respectively, each with 

 very numerous cysts in the flesh, together weighed (;:!() grams; three others of the 

 same lengths and corresponding depths, but with very few (12, more or less) cysts 

 in the flesh, together weighed 700 grams. 



4. Three measuring 150, 162, and 146 millimeters, respectively, each with many 

 parasites, together weighed 280 grams; tlu-ee others of similar length and depth 

 with but very few (less than 12 seen) cysts, together weighed 294 grams. 



Table Showing Effect of the Presence of Cysts in the Flesh on Weight of Fish, Made 

 by Comparing Fish of the Same Length and Depth. 



