XXIII. NOTES FROM THE BENGAL FISHERIES 

 LABORATORY. 



No. 5. PARASITES OF INDIAN FISHES, WITH A NOTE ON 

 CARCINOMA IN THE CLIMBING PERCH. 



By T. Southwell, A.R.C.Sc. {Lond.), F.Z.S., Director of Fisheries. 

 Bengal and Bihar and Orissa, and Honorary Assistant, Indian 

 Museum ; and Baini Prashad, M.Sc., Superintendent of Fisheries. 



(Plates X-XIV.) 

 CONTENTS. 



PAOE. 



1. On the occurrence of the Colloid Carcinouja on the body of the climbing- 



perch {Anabas scnndens, Dald.) 



2. On some Indian Myxosporidia 



3. Some Fish Trematodes 



4. Note on DiscocepJialum jAlmtum, Linton 



5. Two new species of Parasitic Copepods 



341 

 344 



348 

 351 

 352 



Introduction. 



"With the exception of the first part, describing a carcinoma in the 

 climbing-perch, the following paper deals with a variety of parasites 

 of Indian fishes. All the material was collected in the latter half 

 of the year 1917 and the early part of the year 1918, except the 

 Trematoda described. 



I. ON THE OCCURRENCE OF COLLOID CARCINOMA ON THE 

 BODY OF THE CLIMBING-PERCH [AN ABAS SCAN DENS, 

 DALD.). 



Plate X. 



1. Introduction. — During April, 1917 investigations relating to the 

 breeding habits of various fishes w^ere made by the Department, in cer- 

 tain beels in the Khulna district, Bengal. On May 4th, 1917 a number 

 of young specimens (about 70) of the climbing-perch {Anahas scandens, 

 Dald.) roughly 1 cm . long were collected from a beel and brought 

 to Calcutta. These were kept in an aquarium. No care whatever 

 was taken of them. Between May 4th and the beginning of October 

 the water in which the fish w^ere placed was only changed once. The 

 specimens were not fed except on five or six occasions when the office 

 attendant casually threw^ in a handful or so of parched paddy (khai). 

 By the beginning of October only twenty fish remained, the rest having 

 died and been eaten by the survivors. They had then grown to a length 

 of 14 centimetres. About the beginning of August, it was noticed that 

 two of the fish had developed conspicuous outsrowths on various parts 



H 



