AQUATIC PLANTS IN POND CULTURE. 



15 



The needle spikerush {Eleocharis acicidaris) is of very little 

 value except for its 

 early growth. The fine, 

 smooth culms are very 

 easily cleaned by the 

 large-mouth black bass, 

 which cast their spawn 

 upon them. 



One of the water- 

 lilies ( Castalia tube- 

 rosa), w^hich furnishes 

 shade and shelter, is or- 

 namental and of value 

 because of its early 

 growth. It serves as 

 a good protection to 

 young fish from pre- 

 daceous birds. 



Floating heart {Lini- 



nanthemum nymphce- ^^«- 12.— Tuberous white water-lily (Castalia tube- 

 ,j , . .- 1 i J! • 1 rosu). Lake Champlain west through Grout Lakes 



Otaes), while but rairly to Michigan, south to Ti-enton, N. .T., Meadeville, I'a., 



ffOod as a food nro- '*"'^' eastern Nebraska. (After Britton & Brown.) 



ducer, is excellent for shade, shelter, and ornament and is fairly 



hardy. 



The fennel-leaved pond- 

 weed {Potainogeton pecti- 

 natus) is somewhat objec- 

 tionable on account of its 

 excessive growth. It is, 

 however, a good food pro- 

 ducer, a fair oxygena- 

 tor, and fairly good for 

 shelter. Found in 1 to 4 

 feet of water. 



The pickerelweed {Poii- 

 tederia cordata) , found in 

 C to 12 feet of water, is 

 not especially valuable in 

 fish culture, although it 

 has some merit for orna- 

 mental qualities, for shade, 

 and for shelter. It is not 

 thought to be a good oxy- 

 genator or food producer. 



Pig. 13. — Water-lily, or floating heart (Limnnn- 

 themuin nymphwoidcs) . Naturalized in ponds, 

 District of Columbia. Native of Europe and 

 Asia. (After Britton & Brown.) 



