Bepoi't on Diseases and Abnormalities in Fishes. 1 1 



In a third case the liver, which was of a good yellow colour, had 

 attached to one of its lobes by a narrow stalk a dark, hard mass, 

 about 2 inches long-. Here and there in the main liver tissue 

 amber-coloured tubers could be seen. Some of these were long and 

 narrow. The solid mass was found on cutting to be a dark red 

 cheesy mass enclosed in a stout skin. This cheesy mass appeared 

 to consist of blood corpuscles. The skin enclosing the clot 

 contained amber-coloured patches, which were visible to the naked 

 eye. One measured 25 mm. by 2 mm. Inside the green patch 

 were one or two clear ova. They were colourless. There are little 

 patches of granules, attached to which no ovum was made out. It 

 may, however, have been present. The green patch is like a heap 

 of green cells with granular contents. I think they are disorganised 

 blood corpuscles. There appeared to be no inflammation of the 

 parts adjoining the parasites. 



What appeared to be a later stage of the diseased liver was also 

 observed. The thick anterior part of the liver was reduced to a 

 large cyst filled with a thick yellow greasy fluid. A lobe of the 

 liver was still functioning. In the hind portion of this lobe tubers 

 were observed. The diseased portion was bound to the mesentery 

 and to the intestine. The parasite, whether it actually feeds on the 

 blood corpuscles or not, causes haemorrhage by rupturing or 

 weakening the walls of the blood-vessels. I do not think this is a 

 sj)orozoan. I think it may be the egg of a species of vermes. 



The Myxosporidian Myxobolus piriformis is said to form cysts 

 attached to the splenic artery of Tinea tinea* Drew examined a red 

 tumour attached by a narrow pedicel to the liver of a fish. Modules 

 of a similar nature projected from the surface of the liver, and were 

 also present in the deep parts. He says there was an enormous 

 hyperplasia of pancreatic tissue. An explanation was to consider it 

 an adeno-carcinoma of the pancreas, when it would be possible to 

 account for the superficial nodules as secondary metastases. 



A large tumourt which had been apparently loosely attached 

 inside the abdomen, probably to the liver, is seen in fig. 117. 

 The cod was in good condition. 



The tumour was coloured red at one end and greenish at the 

 other. The former was soft, the latter hard. The soft end was 

 filled with a red fluid. The tumour was divided up internally into 

 regular* chambers. The thick rind was greenish stained. The 

 rind contained a greenish paste, in which gelatinous rods could be 

 seen. No proper blood corpuscles were made out in the red fluid, 

 but there were little irregular portions of amber-coloured tissue, 

 which may have been destroyed corpuscles. Part of a section of 

 the tumour is shown in fig. 119. The portion was filled with white 

 They were dispersed right through the tissue, which is red. There 

 are also solid nodules present. Each nodule was full of granules 

 and corpuscles. An outer skin could be dissected off the nodule. 

 This is probably the disease of the liver described above. 



A normal liver of cod, when digested in a steam-heated boiler for 

 the purpose of oil-extraction, usually falls away to a sort of niuddv 

 residue. But occasionally hardish lumps are found that resist this 

 disintegration. They are of a friable, soapy or cheesy consistency. 

 In a thin section dark granules are visible in a translucent matrix. 

 This appears to have been a blood clot such as is described above. 



* Gurley. t Presented by Mr. H. Cardno. 



