366 U- S. BUREAU OF FISHERIES 



If the supply of fish in puhhc streams is to be maintained it is very 

 essential that special consideration be given to these three important 

 points. 



There has been considerable agitation in regard to the establish- 

 ment of dams in rivers. Where such obstructions prevent the pas- 

 sage of the anadromous species to their natural spawning grounds 

 they may constitute a serious menace to the future of certain fisheries. 

 Under some conditions dams are a distinct benefit, since they form 

 large reservoirs that furnish more protection and longer nursery 

 areas to fish than do the natural streams, and thus serve as a source 

 for the development of a large amount of natural food for fish. 



Every year the bureau is receiving an increased amount of coopera- 

 tion from fish and game clubs in the protection of waters in which 

 they are directly interested. Such organizations not only receive the 

 fish and carefully plant them in suitable places, but they are instru- 

 mental in the enforcement of the bag and size limit and in the pro- 

 tection of local waters against illegal fishing. 



A more favorable sentiment is developing along the upper Missis- 

 sippi River with regard to the salvage of food fishes from landlocked 

 pools, and several organizations have furnished within recent years 

 an appreciable amount of assistance in the work. This is especially 

 true in Louisiana, where the fish are removed from more or less 

 inaccessible waters and placed in streams and lakes where they will 

 be of futiu-e benefit to the public. 



i>art 1.— FISH PRODUCTION: PROPAGATION AND RESCUE 



WORK 



TABULAR SUMMARIES OF OPERATIONS 



SPECIES OF FISHES HANDLED 



During the fiscal year 1924 the fish-cultural work of the bureau, 

 including artificial propagation and rescue work, involved the hand- 

 ling of 53 species oi fishes, as follows : 



LIST OF SPECIES HANDLED 

 The CATFISHES (SlLURID^): 



Blue catfish ( Ictalurus furcatus ) . 

 Channel catfish (Ictalurus pundatus). 

 Horned pout, bullhead {Ameiurus nebulosus). 

 Mississippi catfish (Ameiurus lacustris). 

 Yellow catfish (Ameiurus natalis). 

 Black bullhead (Ameiurus melas). 

 Mud catfish (Leptops olivaris). 



The SUCKERS ( CAXOSTOMIDiE) : 



Mongrel buffalo fish (Iciiobus urus). 



Common buffalo fish (Ictiobus cyprinella). 



Small-mouth buffalo fish ( Iciiobus bubalus ) . 

 The carps (Cyprinid^): German carp (Cyprinus carpio). 

 The shads and herrings (Clupeid^e): 



Shad (Alosa sapidissima). 



Glut herring ( Pomolobus aestivalis ) 



