76 Lake Maxinkuckee, Physical and Biological Survey 



Occasional notes and memoranda were made regarding various 

 species which we did not have opportunity to observe regularly or 

 methodically. Such of these as seem to possess some value or in- 

 terest are given in the following pages. 



The list of species contained in the Plankton collections of 1899 

 and 1900 and a discussion of their abundance, distribution and 

 habits will be found in Professor Juday's report. A few addi- 

 tional species were later obtained in the small ponds about the lake. 



Of the individual species not much can be said ; our studies were 

 too general for that purpose. 



It may be stated, however, that plankton species of crustaceans 

 constitute a large part, probably nearly all, of the first food of 

 young fishes, and much of the food of some species of fishes 

 throughout their entire lives. The little Stickleback (Eucalia in- 

 constans), for example, may be mentioned as one of such species. 

 Examples of this species kept in an aquarium fed eagerly on any 

 and all plankton crustaceans which we placed in the aquarium with 

 them. We observed also that these small crustaceans are captured 

 and eaten freely by those curious carnivorous plants, the bladder- 

 worts. 



Of the whole group, it can be said that they are present through- 

 out the year in greater or less abundance. The abundance varies 

 greatly, however, from time to time, as shown by Juday. On Sep- 

 tember 6 (1906), peculiar ripples were observed on the surface of 

 the otherwise smooth lake. Upon cautiously approaching the spot 

 it was found that the disturbance was caused by large schools of 

 very young black bass, circling about and feeding voraciously. 

 Upon drawing a towing-net through the place great quantities of 

 several species of plankton crustaceans were obtained. 



On many occasions the lake surface in large areas was seen to 

 be covered with a thin scum which, on examination, was found 

 to consist chiefly of the cast-off skins of minute crustaceans. 



On November 5 (1906), Entomostraca were present in such re- 

 markable abundance at and near the surface of the lake that the 

 water had the appearance and consistency of thick soup, the little 

 animals actually crowding each other in the water. The next day 

 great windrows of these crustaceans were found washed up on 

 the shore at Long Point. Two days later they were again observed 

 forming dense clouds at and near the surface of the lake off the 

 Morris boathouse. A 4-drachm vial was simply dipped into the 

 water and about 100 of the creatures were secured. 



A quantity of plankton collected July 7 (1909), and examined 

 qualitatively by Professor A. A. Doolittle of the department of 



