120 



BULLETIN OF THE BUREAU OF FISHERIES. 



Sardd sarda. Bon i to. 



Woods TTolo. Mas.s., 1905. — luly 24, live fish examined. July 27, one fish 

 exMniincd. Xuinerous (\ysts were found in the stomach wall of two, and few in 

 eac'Ii of the others. 



Alutera xcJiapf. Filefish. 



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

 tine. Associated witli cysts containing a larval Dihoihrmm. 



raraUcJiiln/.'i ilciitatiis. Summer Flounder. 



Woods Hole, Mass., 1905.— Aul;. IS, two. Cysts found in stomach wall and in 

 me.sent(>ry, associated with cysts of TcfnirJn/nclius hisulcatus. 



EFFECT OF THE PRESENCE OF CYSTS ON WEIGHT OF HOST. 



In order to ascertain how much, if any, the weight of fish was aifected b}^ 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 tlu'ee others of ecjuaj 

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

 respectively. Tlu-ee of these fish, each of which had very numerous cysts in the 

 flesh, together weighed 672 gi'ains; thi-ee others of similar dimensions, but with 

 relatively few parasites, weighed 6S6 grams. 



2. Another lot of tlu'ee fish, each 200 millimeters in length, each with very 

 muueroiis 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, 

 weigiied 05S grams. 



.'i. Tlnee fish n^easuring 190, 200, and 210 millimeters, respectively, each with 

 very munerous cysts in the flesh, together weighed 6.30 grams; tlu'ee others of the 

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

 in the llesli, 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 v<M-y few (less than 12 seen) cysts, together weighed 294 grams. 



T.\nLio Sii(>\viN(i Efkkct ok the Presexce of ('y.sts in the Flesh on Weight of Flsh, Made 

 BY CoMPARixG Fish of the S.\me Length and Depth. 



