8 



U. S. BUREAU OF FISHERIES. 



therefore valuable for early spawning fishes, such as the goldfish 

 and carp. It is found in 2 to 5 feet of water, reaching to the 

 surface. 



Fig. 7. — Wild celery, or eelgrass (Vallis- 

 neria spiralis). In quiet wators. New 

 Brunswick to Florida, west to Minne- 

 sota, Iowa, and Texas. (After Britton 

 & Brown.) 



Fig. 8. — Slender Naias (Naias flexilis). 

 Found in ponds and streams through- 

 out nearly all North America. 

 (After Britton & Brown.) 



Another Potamogeton (foUosus), the leafy pondweed, also good as 

 a food producer and oxygenator and for shelter, is found in 2 to 4 

 feet of water, extending to but not above the surface. 



Fig. 9. — Waterwced {Philotria canaden- 

 sis). Found nearly throughout North 

 America, except extreme north. (After 

 Britton & Blown.) 



Fig. 10. — Water stargra.'^s (Hete- 

 ranthera dubio). I'^ound in 

 still water, Ontario to Oregon, 

 .south to Florida and Mexico. 

 Also in Cuba. (After Britton 

 & Brown.) 



The wild celery, or eelgrass (ValUsneria spiralis), is found to be 

 a good oxygenator and is a desirable phint because of its early 

 growth. It is also good for shade and shelter and is an excellent 



