28 U. S. BUREAU OF FISHERIES. 
(usually about six days), after which the treatment is given once a 
day for about 10 days, which is usually sufficient to rid the fish of the 
parasites. 
‘The effect of the sal-soda solution is to cause the parasites to shrink 
and wrinkle as they die. It is apparent that the solution kills 
the free swimmers, the young just attached to the fish, and all but the 
larger and more thoroughly embedded parasites. These last leave the 
fish in the natural process of development, and their offspring are 
killed with others after they attack the fish and before they attain 
their maturity. Thus in time the parasites are entirely exterminated. 
The channel catfish were fed, as usual, ground liver three times a 
day while the treatment was in progress, and the usual care was given 
the fish and troughs as to cleanliness. 
OCEANOGRAPHIC AND LIMNOLOGICAL STUDIES. 
INVESTIGATIONS IN THE ATLANTIC. 
Because of deficiency in funds and personnel the A/datross has not 
been at sea during the year. 
Some brief cruises to complete the field work of the hydrographic 
and biological survey of the Gulf of Maine were made by the small 
Fisheries steamer Haler ‘yon under the direction of Dr. H. B. Bigelow. 
The preparation of the report upon all the data gathered at different 
times during a period of years is now in progress, although its com- 
pletion has been delayed by the death of William W. Welsh, who was 
giving special attention to the portion of the report dealing with the 
occurrence, distribution, and life histories of the fishes. 
By joint action of the Governments of the United States, Canada, 
and Newfoundland there has been formed during the year an Interna- 
tional Committee on Marine Fishery Investigations, with the object 
of hemes about a better correlation of the activities of the several 
Governments in fishery investigations in which two or more of the 
countries are directly inter ested. Knowledge of the cod and the con- 
ditions of its perpetual conservation, for example, possesses the same 
interest to Canada and Newfoundland as to the United States. No 
formal cooperative effort is contemplated, but it is believed that 
progress will be attained more rapidly and economically by regular 
interchange of data-and counsel than by entirely detached endeavor 
on the part of each nation. The members of the committee are as 
follows: For Canada, Mr. William A. Found, Assistant Deputy 
Minister of Fisheries; Dr. A. G. Huntsman, member of the Biological 
Board of Canada, and Mr. Loring C. Christie, legal adviser, Depart- 
ment of External Affairs, Ottawa; for Newfoundland, Mr. D. James 
Davies, chemist to the Newfoundland Government; for the United 
States, Dr. H. F. Moore, Deputy Commissioner of Fisheries, Dr. R. BE. 
C oker, assistant in charge, scientific inquiry, Bureau of Fisheries, and 
Dr. H. B. Bigelow, consulting oceanographer, Bureau of Fisheries. 
The first meeting of the committee was held in Montreal, June 23, 
1920, when, after full discussion, a greement was reached as "to corre- 
lation and interchange of statistical data with regard to particular 
fishes, uniformity in methods of plankton study, ‘and concentration 
of attention upon certain species. 
