736 U. S. BUREAU OF FISHERIES 
in Montana, Wyoming, and Idaho were supplied with brook, rainbow, black- 
spotted, and Loch Leven trouts. 
The car returned to Dubuque on October 10, and, as the distribution of the 
warm-water fishes from the various substations along the Mississippi River in 
the vicinity of Dubuque had been completed, the car was ordered to Fairport, 
Iowa, where it received a load of pondfishes for delivery to applicants in Pennsyl- 
vania. After completing this trip it proceeded to Washington, D. C., the mem- 
bers of its crew being sent to various stations of the bureau for the winter. Annual 
repairs were made during January, 1927, at the Pennsylvania Railroad shops at 
Wilmington, Del. 
From April 1 to June 30 the car was used in distributing the 1927 output of 
trout from the White Sulphur Springs station to applicants in Pennsylvania, 
Virginia, West Virginia, and Maryland, which necessitated making carload ship- 
ments to the following points: Uniontown, Williamsport, Kane, Bellefonte, 
Pittsburgh, and Scranton, Pa.; Elkins and Grafton, W. Va.; and Oakland, 
Md. In completing this distribution the car made 24 trips, traveled 19,800 paid 
and 2,176 free miles, and supplied 890 applicants in 11 States with 4,743,845 trout 
and pondfishes, as follows: 








Finger- Finger- | Finger- Finger- 
Species Fry lings lings | lings lings Adults 
No. 1 INo#2! >|) Nore No. 4 
Catfishacs fetes 5 hs ee ee ee eo sae ee ee pice shee noe eS = Si } 2, 940 
Rain DOWALLOM Teese es eee Jacsascocntes 403, 200 551, 400 | 69)'750 |S = see pe an 
Black-spotted: trots. 2 ee e |Se 268, 800 810002252 | eee 18 
MochiWevensiroute 222 Seep UM a 237,600. 22sec ES! Se ee res 
IBOOK GROW te ee on oes | ee 525, 500 210, 600 269; 800) | 25 saree 5, 012 
Graylinge= 262 ee [ee oe ae = |e ee ee 18 
Targemouthuplacks Pass = eee |e ce aR Ea 11, 600 4, 575 12 
Smaliniouthiplackibass= = sates |S 2e as ee Sa ee | eee eo 2;600 |. 2-2-2. ee | eee oe 
SUT AAS Haha aa Pe Sh Bi 1) ees ee (eoge_csS tee ee 420 
PIKO ELC ha eae ee rear a || «62, 080;(000)|Barsce ooo ek eee oo fl Poo Se Se 2 | cs Se 
Yellow perch ote vca 02 Sul ele | see ee oe |e Poa 3, 750 1, 200 300 aes 
"Total ep seeme. ie Ue’ oes | 2,080,000 | 1,211,150 1,084, 450 | 354, 950 ~ 4,875 8, 420 

FILTROS PLUGS 
The porous substance known as filtros, which was used on the 
bureau’s distribution cars for the first time some years ago, has 
proved quite satisfactory as a means of diffusing air into the water 
of the fish container. Prior to the introduction of this material 
plugs made of basswood were used in specially designed holders of 
hard rubber having three threaded openings where the plugs were 
inserted. The old-type wooden plug, of course, was subject to con- 
traction and expansion and required a great deal of attention, it 
being necessary to examine the plugs carefully at the end of each 
trip and to replace them once or twice a year. Moreover, the com- 
bination could not be purchased from any dealer, the plug holder 
being made in a special matrix and the plugs by hand. This made 
the cost quite high, and their use by the States was prohibitive. 
The bureau has standardized the filtros plug, and States desiring 
to use it may purchase their supplies from the dealer who supplies 
the bureau. This plug does not require a special holder, as it can 
be inserted in the end of the rubber tube leading from the pipe line 
to the fish container. It is always in condition for use and need not 
be replaced for at least three years. It may be purchased in a size 
to fit a 44-inch rubber tube. All the bureau’s cars are using this 
material with satisfactory results. 
O 

