78 



U. S. BUREAU OF FISHERIES. 



Results of Tests with Hehium; Mn;r as Food i on Rainbow Trout — Contd. 



NEOSHO (MO.) STATION. 

 [Test continued for 30 days — 2,000 fish per trough.] 



Trough 

 num- 

 ber. 



Fq0d used. 



Weight per 1,000 fish. 



At be 



ginning of 



test. 



At end 

 of test. 



Gained 



during 



test. 



Loss per 



1,000 fish 



during 



test. 



1 



2 



3 

 4 



Canned herring milt 3 days, beef hearts 3 days, alter 

 nately 



Canned herring milt 3 daj's, sheep liver 3 days, alter- 

 nately 



Beef heart 



Sheep U ver 



Ounces. 



6 



6 

 6 

 6 



Ounces. 



12i 



Hi 

 19J 

 12 



Ounces. 

 6h 



5i 

 13J 

 6 



P er cent. 



WHITE SULPHUR SPRINGS (W. VA.) STATION. 

 [Test continued for 20 days — 10,000 fish per trough.] 



1 

 2 

 3 



Canned herring milt , 



Sheep liver 



Canned herring milt 10 days, sheep liver 10 days, alter- 

 nately - 



12J 



lA 



WYTHE VILLE (VA.) STATION. 

 [Test continued for 10 days — 13,000 fish per trough.] 



1 ; Canned herring milt . 



2 1 Beefheart 



7JI 



"Iff 



Rescue Operations. 



[C. F. Culler, in Charge.] 

 OUTLINE OF POSSIBLE EXTENSION. 



So much has ah^eady been said reo;ardino; the importance of the 

 rescue operations conducted in the Mississippi Basin, their vahie, 

 simplicity, practical returns, and comparatively low cost that these 

 phases of the work should be familiar to all interested persons. A 

 brief outline of the possibilities of extending the work, with sugges- 

 tions as to its re(iuirements, may not be out of place, in view of the 

 bill now pending before Congress to provide funds for enlarging 

 its scope. Almost unlimited possibilities exist for the further ex- 

 tension of the work. In the bureau's greatest effort during the fiscal 

 year 1920, when approximately 160.000,000 of fishes were saved, not 

 more than 40 per cent of the available territory was covered. There 

 are many miles of unbroken stretches of river lowlands where floods 

 annually result in the destruction of millions of fish, while the major 

 tributaries of the Mississippi afford a field of unknown possibilities. 

 For the economical and efficient conduct of the work it would be 

 desirable to establish headquarters near the central point of the 

 more important operations, with a personnel available for its prose- 

 cution at all times. Under present arrangements the personnel for 

 the rescue work is drawn from four of the regularly established 



