PROGRESS IN BIOLOGICAL INQUIRIES, 19 3 . 603 



requirements for fish ijrotection as held to be necessary by the State 

 officials and the Bureau of Fisheries. These specifications have been 

 presented by the Commissioner of Fisheries to the Federal PoAA^er 

 Commission for incorporation in the project license if and when 

 issued. 



The Ariel development, which is planned for an ultimate capacity 

 of 180,000 kilowatts was visited several times during the summer and 

 fall of 1930. The dam is 180 feet high. Here a very comprehensive 

 scheme of fish protection has been carried out under the supervision 

 of the Division of Fisheries, State of Washington. The plan involves 

 the mechanical handling, ripening, spawning, and rearing of fish on 

 a large scale. Much that is novel has been introduced. The work 

 reflects careful planning and supervision. The fish protective works 

 being provided here will cost approximately one-third of a million 

 dollars. 



The North River power project proposes the development of 

 37.500 horsepower by the building of a concrete dam 112 feet high 

 on the North River, in Pacific County, Wash. The plan for fish 

 protection, as worked out in cooperation Avith the Division of Fish- 

 eries, State of Washington, proposes mechanical handling of both 

 upstream and downstream migrating salmon. Conditions at this 

 site lend themselves to such a procedure. 



The important problem of the practicability of handling migrating 

 salmon mechanically at high dams will go on trial at North River, 

 and the work is expected to attract the interest of all concerned with 

 fish conservation. 



INVESTIGATIONS IN THE INTEREST OF FISH CULTURE 



Investigations of direct interest to fish culture under the direction 

 of Dr. H. S. Davis, in charge, aquicultural investigations, have been 

 extended during the past year. Studies under the general projects of 

 pond-fish culture and trout culture have been continued and have 

 developed normally, producing additional results of practical value. 

 Experimental propagation of largemouth and smallmouth black bass, 

 crappie, and bluegill sunfishes was continued at Fairport, Iowa, and 

 theoretical limnological studies in both laboratory and field were 

 conducted. 



A brief survey of stream conditions in southeastern Nebraska 

 Avas made, and field experiments on increased fish production in the 

 Upper Mississippi Wild Life and Fish Refuge have resulted in a 

 comprehensive program of fish culture in that area. 



Feeding and breeding experiments on trout were continued at the 

 Pittsford (Vt.) station, and stocking experiments with black-spotted 

 trout and Montana grayling were midertaken in the vicinity of the 

 station. Studies of the diseases of fish, particularly trout, Avere con- 

 tinued, and an additional project embracing a study of the epidemic 

 of sea herring in Maine was undertaken. 



POND-FISH CULTURE 



InA'estigations at the Fairport (Iowa) station Avere carried on 

 under the immediate direction of Dr. A. H. Wiebe. This station 

 serves as headquarters for investigations relating to pond culture, 



