Biological Survey — Oswego Watershed 



205 



to trout streams. Due to lack of time the potential animal foods 

 were taken from only one square foot in each of the eight types 

 selected and hence the weight in grams of available food given for 

 each type, cannot be considered as average. The bottom fauna as 

 well as organisms on or about the plants in one square foot were 

 taken in each study and therefore the available food cannot be 

 considered as that which the weed beds alone produced. All of 

 these studies were made in quiet or semi-quiet waters. The plant 

 beds were practically pure stands, occasionally having small 

 amounts of others plant forms growing with them. 



In chart 2 the plant beds from which the forage organisms 

 were taken are shown in order of their productiveness in grams 

 per unit area (derived from Table 8). It is seen that the largest 

 amount per square foot 37.0 grams was found in a chara bed, 



38 



37 



3H 



35 



34 



33- 



32- 



31 



3 on 



29- 



28' 



27" 



2b- 



25- 



24 



23 



22 



21 



20 



1? 



18- 



17- 



16 



15H 



14 



13 



12- 



11 



10' 

 9- 

 8H 



Chart 2. — Showing 

 foot 



lilable fish food by weight in grams per one square 

 certain types of submerged plant beds. 



