FISHES OF GREEN LAKE, WIS. 267 



85 per cent of the food comes from the bottom (65) and the water plants (20), leaving 

 only one large item — the cladocerans — unassigned, and probably a portion of this 

 item should be placed with the bottom and water plants. It is of course impossible to 

 give exact figures in assigning animals used as food to particular habitats, but there is 

 no doubt that the fishes get the greater part of their food from the bottom and from the 

 shore vegetation. The open-water plankton (which to be sure is poor in this lake) 

 is of little importance, except perhaps as food for the young of ciscoes and other fishes. 



According to tlie ratios of particular foods consumed (during the period when 

 observations were made), the fishes of Green Lake may be arranged as follows: 



Fish. — Pickerel (97), yellow bullhead (32.5), smallmouth black bass (13.61, largcmouth black 

 bass (0.9), perch (0.5). 



Insect larvcE. — ^Johnny darter (82.1), pumpkinseed (59.5), blunt-nosed minnow (50), perch (34), 

 bluegill in), smallmouth black bass (31.9), top-minnow (217), sucker (19), largemouth black bass 

 (16.7), rock bass (11. 8), yellow bulUiead (10), speckled bullhead (3.8), carp (2), cisco (i.i). 



Insect pupcE. — Blunt-nosed minnow (50), largemouth black bass (18.6), top-minnow (13.7), perch 

 (8), smallmoutli black bass (7.8), bluegill (1.7), rock bass (0.6). 



Adult insects . — Yellow bullhead (24), bluegill (12.9), largemouth black bass (9.3), smallmouth 

 black bass (5), sucker (0.3J. 



Mites. — Rock bass (4.2), speckled bullhead (0.5), blimt-nosed mionow (0.5), bluegill, -f . 



Crayfishes. — Rock bass (64), speckled bullhead (25.6), yellow bullhead (10), bluegill (9.2), large- 

 mouth black bass (4.1), perch (3.2). 



Mysis. — Cisco (4.7). 



Amphipods. — Cisco (61.2), sucker (40.7), top-minnow (35.2), perch (28.6), carp (25), largemouth 

 black bass (18), bluegill (14.81, yellow bullhead (12.5), smallmouth black bass (4.1), rock bass (2.9), 

 speckled bullhead (2.6), Johnny darter (2.5). 



Cladocerans. — Smallmouth black bass (37.61, largemouth black bass (25.4), top-minnows (16.6), 

 rock bass (12), carp (11), perch (10.7), yellow bullhead (i), speckled bullhead (o.i), bluegill (-(-). 



Copepods. — Cisco (1.3). 



Oslracods. — Carp {t,^), top-minnow (6.4), cisco (3), pickerel (i), sucker (0.7), rock bass (0.2), Johnny 

 darter (o.i), largemouth black bass (o.i), perch (-|-). 



Clams (all Sphaeriidae). — Sucker (29.9), carp (15), cisco (9.9), pumpkinseed (6.5), speckled bull- 

 head (0.6), perch (0.2). 



Snails. — Speckled bullhead (31.4), pumpkinseed (26.5), perch (6.6), cisco (o.8j, bluegill (0.5), 

 sucker (0.4K 



Leeches. — Pumpkinseed (7.5), perch (0.2). 



Oligochoetes. — Speckled bullhead (7.2), perch (1.2). 



Nematodes (Gordiacean). — ^Top-minnow (0.1). 



Sponges. — Bluegill (0.51, sucker (0.3). 



Plants. — Speckled bullhead (22), bluegill (21.3), yellow bullhead (10), largemouth black bass (5.2), 

 perch (3.8), carp (3), pickerel (2), cisco (0.7), smallmouth black bass (0.2). 



.-l/i/fE. — Bluegill (1.7), speckled bullhead (0.8). 



Bottom ooze. — Carp (10), cisco (8.2), sucker (3), bluegill (2.2), perch (0.5). 



Sand. — Johnny darter (15.3}, top-minnow (5.9), sucker (5.7,1, rock bass (4.2), bluegill (2.2), carp 

 (2), perch (i), smallmouth black bass (0.2), largemouth black bass (0.1). 



Unknown. — Speckled bullhead (5.6), perch (0.4). 



