Fish-cultural Conditions at forest Pari: 315 



have been using the sod very extensively for bass nests, placing them 

 IS feet apart in 12 to 18 inches of water. 



Mr. G. W. N. Brown, Homer, Minn.: In how large pieces? 



Mr. Kopplin : About the size of an ordinary chair bottom. 



Mr. Brown: Of what thickness? 



Mr. Kopplin : About 3 inches. 



Mr. Brown: Do you leave the grass side of the sod up? 



Mr. Kopplin: The grass is not long — only about 1 inch to 2 inches 

 high. The bass are constantly working over there sweeping the sedi- 

 ment off the surface. 



Mr. Meehan : Don't you think that after the young bass haye started 

 to grow, if you made an examination of the sod early in the morning 

 you would find young fish feeding on the eggs of the goldfish, or wher- 

 ever they deposited their eggs, thus furnishing a lot of food for the 

 little bass? 



Mr. Kopplin : Yes. 



Mr. Willard : Dave you noticed particularly whether your little 

 bass feed more generally upon the spawn of the goldfish, or do they 

 feed upon the little goldfish? Have you seen them feed on the very 

 minute goldfish? 



Mr. Kopplin : Yes. 



Mr. Willard: Don't the little bass catch them? 



Mr. Kopplin: Yes. I notice that the goldfish are hot after their 

 own eggs; but 1 have not noticed the bass. 



Mr. Buck: Have you had any trouble with the adult goldfish eating 

 the eggs of the bass? 



Mr. Kopplin: The poor goldfish are scared — they are afraid of the 

 bass and do not eat their eggs. 



Mr. Worth: About that matter of the algae, I would like to under- 

 stand what plant it is— while Dr. Forbes and Dr. Bean are here, who 

 actually know what such things are. From Dr. Hugh M. Smith's 

 excellent book, on the Japanese Goldfish, T derived the idea that the 

 algae were very many very small floating plants, so small that they were 

 microscopic and constituted the food of crustaceans which are in them- 

 selves sufficiently small to comprise' the food of black bass fry. But 

 now it seems they are speaking of a massive growth that is floating 

 on the surface of the water, that is in strands, in threads, green like 

 a plant, and called frog spittle. 



.Mr. Kopplin : That is it. 



Mr. Worth : What is the scientific name of that frog spittle? 



Dr. Forbes : There are a great many species of what are called 

 filamentous algre. The various species of Spirogyra are such forms; 

 but there is often a great mixture of species in a single film or sheet 

 of algae on the surface of a pool. Some consist of single separate cells ; 

 but the threadlike algae are composed of a series of cells joined end 

 to end. They form by their interlacing a web composed of long threads 

 and strands, among which single minute cells and a variety of other 



