Anadromous fishes spawn in fresh water and spend 

 part of their lives in the sea. These species, which 

 include the Pacific and Atlantic salmons, Atlantic shad, 

 and striped bass of both coasts, are sought by sport 

 fishermen as well as by commercial fishermen. 



Because part of their life is spent in streams, we 

 can "do something" about the anadromous fishes. 

 Stream conditions can be improved, pollution abated, 

 fishways built, and adequate numbers of adult fish 

 permitted to escape to spawn. Anadromous fishery 

 research now being conducted by the Bureau is de- 

 signed to provide the information needed to do these 

 things. 



Of all our inland waters, the Great Lakes produce 

 the choicest freshwater fishes. But the fisheries 

 fluctuate widely; fisheries for certain species collapse 

 or sporadically expand to the ultimate disadvantage of 

 all concerned. These fluctuations and their underlying 

 causes are not completely understood although specific 

 causes such as sea lamprey invasions have received 

 considerable attention. 



To save the lake trout and other fish from the 

 predatory sea lamprey and restore the livelihood of 

 many fishermen, the Bureau, the States bordering the 

 Great Lakes, and Canada conduct research and test 

 control measures against the lamprey. Chemicals that 

 destroy lamprey larvae without significantly harming 

 fish and other aquatic organisms have been found and 

 are used to control sea lampreys in streams tributary 

 to the Great Lakes. 



Research on marine fishery resources encom- 

 passes the waters of the Atlantic Ocean from the 

 Grand Banks to Florida, the entire Gulf of Mexico, 

 and the eastern and central Pacific Ocean. The Bureau 

 is carrying on projects dealing with life history, 

 migration, distribution, racial identity, abundance, 

 growth, mortality, relation to environment, pre dation, 

 and general biology for various species of commercial 

 importance. In addition to the economic species, their 

 food and their enemies, the conditions in their environ- 

 ment which favor or injure their wellbeing- -the whole 

 field of oceanography is an important area of research. 



At six laboratories along the Atlantic coast from 

 Maine to Florida, Bureau scientists are conducting 

 research on oysters, clams, scallops, and mussels. 

 They are studying ways to propagate these shellfish 



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