584 U. S. BUREAU OF FISHERIES 
From the 12 circular rearing ponds operated at the Spokane, (Wash. ) 
substation, approximately 230,000 large fingerling brook, rainbow, and 
blackspotted trout were distributed. All except 6, 000 of these fish 
were planted by the Conservation Departments of Washington and 
Idaho. A four-room, frame, one-story cottage, with concrete base- 
ment, was constructed. A conerete foundation for a hatchery build- 
ing 38 by 54 feet was poured and fill made within the foundation walls 
preparatory to the laying of a concrete floor. At present, this station 
utilizes trough space in the local State hatchery for incubating its 
trout eggs. 
As there was no stock of eggs or fish on hand at the Mount Rainier 
(Wash.) substation at the beginning of the year, the entire unit, in- 
cluding water-supply lines, ponds, troughs, feeding tanks, and all 
fish-cultural tools and appliances, was thoroughly sterilized with 
calcium hypochlorite to eradicate fish parasites and diseases which 
had prevailed. When the shipments of eggs were received, they were 
sterilized by submerging them in a 1:2,000 solution of acriflavine for 
20 minutes before they were placed in the hatching troughs. As a 
result of this precaution, the stock of fish at this hatchery remained 
free of all diseases during the year. This station collected rainbow 
trout eggs from Mowich Lake and received approximately 850,000 
eggs of rainbow, brook, and blackspotted trout from other points. 
The greater percentage of the resultant fish were planted in the waters 
a the Mount Rainier National Park and the Snoqualmie National 
orest. 
The Spearfish (S. Dak.) station installed 4-foot red and green Neon 
lights under the surface of the water in some of the trout ponds to 
attract insects for fish food. One cottage was constructed and many 
repairs and improvements were made to the buildings, equipment, 
ponds, and water-supply system. The egg-take from the station 
brood stock was only about 50 percent of that of the past season, due 
to the large number of barren females among the rainbows and the 
heavy mortality of the Loch Leven stock prior to the spawning season. 
The small laboratory continued to be a very important unit at this 
station. Through weekly microscopic examination of all lots of fish 
many diseases are diagnosed and checked before they cause serious 
trouble. 
NEW ENGLAND TROUT STATIONS 
Owing to the appearance of furunculosis the latter part of last year, 
and the consequent disposition and destruction of all fish on hand, 
fish-cultural operations at the National Forest (N. H.) station were 
suspended until the receipt of eggs during the fall of 1938. The States 
of Vermont and New Hampshire furnished 1 million brook trout eggs 
with the understanding that the Bureau would provide food equal to 
their value. To supplement these eggs, approximately 1/4 million 
were collected from yearling and 2-year-old fish held in the Whitefield 
rearing ponds of the New “Hampshire Fish and Game Department. 
Repairs and improvements were prosecuted by W. P. A. and P. W. A. 
workers. The pond system was enlarged by the construction of ad- 
ditional raceways 3 feet wide by 165 feet long, in three equal sections 
with falls between. These ponds are arranged in such a way that 
four different water supplies may be utilized if necessary. 
