Volume II SEPTEMBER, 1909 No. 3 
SOME NOTES ON PARASITIC AND OTHER 
DISEASES OF FISH. 
By G. H. DREW, B.A. Cantab. 
Plate II. 
CONTENTS. 
PAGE 
A new species of Pleistophora invading the muscles of a Cod . . 193 
On bacterial infection accompanying the invasion of the swim bladders 
of trout by Cystidicola farionis ( G . Fischer).195 
Primary Carcinoma in the liver of Eainbow Trout. Plate, Fig. 1 . 197 
A superficial new growth occurring in a Dog-fish. Plate, Fig. 2 . 198 
A myxo-fibroma originating in the jaw of a Trout. Plate, Fig. 3 . 199 
Pericarditis in a Turbot . ..199 
A recurrence of the ‘ Salmon Disease 1 in the Colne .... 200 
In the following notes no attempt has been made to enter into the 
pathology or etiology of the diseases described, as only isolated cases 
have been available for investigation. 
I am much indebted to the Council of the Marine Biological 
Association of the United Kingdom for their kindness in granting me 
a table at their Plymouth Laboratory. 
A new species of Pleistophora invading the muscles of a Cod. 
In January of this year a cod caught off the Iceland coast was sent 
to me for examination. 
Diffuse pigmented areas of a brownish colour were present in various 
parts of the muscular tissue. The boundaries of these areas were ill 
defined, but the pigmentation was more intense in the central portions, 
where the muscular tissue showed marked degeneration. 
Unfortunately only portions of the infected muscle were sent 
for examination, and none of the viscera were available. The specimen 
was sent unpreserved, and the tissues were somewhat degenerated when 
it arrived. 
Parasitology: ii 
13 
