594 U. S. BUREAU OF FISHERIES 
been in use for the past few seasons and have yielded excellent results. 
During the year additional pond acreage was under development at 
Genoa, Wis., and Guttenberg, Iowa. The former, which produced 
approximately two million bass fingerlings, now constitutes an exten- 
sive fish-cultural unit, while the latter, when completed, will be one of 
the largest hatchery developments i in the country. A number of years 
will be required for full realization of this program, but the projects 
are being placed in productive operation as fast as individual ponds 
can be completed. The La Crosse (Wis.) Station, headquarters for 
these activities, has hatched and distributed 1,082,600 trout for 
direct planting in suitable waters and for transfer to Forest Service 
aie ponds and cooperative nurseries maintained by sportsmen’s 
clubs. 
The Homer (Minn.) substation was largely engaged in the over- 
hauling and repairing of equipment, boats, trucks, ete., utilized in 
that territory. The personnel also constructed seines, dip nets, egg 
cases, boats, outlet kettle forms, and other apparatus for use at the 
various hatcheries. 
Fish rescued and restored to original waters, fiscal year 1939 

Species Number 
Ble ckabass- sae 2 segsre Aoee Pes Ce RS ee 9, 700 
Crappie ya. = Wiles {vor Bie pe een aie el 121, 300 
Sibuaatslats 3*+ Bi - oS lye 2S a0 ee oe Coane ad Loe et 210, 400 
Catfish aay oe) 2: Beye a. he ed hes ee 2 a 1, 379, 000 
Mellowaperchmeesep:: 240 2). eee > oe Nee eee 93, 600 
Piketpickerelee ae! ee 0) HNL ER EO oS Poe 2, 620 
Buftalofish seq oye 29) Pei 8 a ove eae oe 31, 700 
Wihite (bass se aaeee 10. 2 ees: 2 7, 500 
Mis cellanecousseteant 5 2325 eee Soe 9, 000 
ARO Reale Ses tee et ae TSE RICA EPS 1, 864, 820 
Note.—tThe station at Guttenberg, Iowa, handled 1,352,020 of the above- 
enumerated fish and the station at Marquette, Iowa, handled 512,800. 
AQUARIUM 
The Bureau of Fisheries’ aquarium, which is located in the basement 
under the main lobby in the Department of Commerce Building, has 
constantly increased in popularity among all classes of visitors. The 
fact that it is open to the public on Saturday afternoons and Sundays 
until 4 p. m. has enabled many who would not otherwise find it pos- 
sible to view the displays during the weekends. 
The number of specimens and species on display has varied some- 
what during the year, but, as a general rule, approximately 1,500 
individual specimens, representing about 50 varieties, are shown in 
the 47 tanks and 3 floor pools. 
A consignment of spoonbill catfish (Polyodon spathula) collected 
from the Ohio River was received. However, the shipment arrived 
during the rainy season and the fish were unable to endure the chlorine 
in the water. Small activated carbon filters have been installed for 
the purpose of removing as much of the chlorine as possible in order 
to maintain the species ‘that are susceptible to this chemical. 
Further experiments were made with potassium permanganate in 
the treatment of fish affected by external parasites, expecially with 
