Biological Survey — Genesee River 63 



mouth of the river. September 2, Black creek (Monroe Co.), 1 5/16 inches. 

 Food: 70% Crustacea (mainly Hyalella knickerhockeri) and 309o midges 

 {Chironomidae) . 



Gaste^iosteiuae Sticklehacks 



Euculia inconstans (Kirtland). — Brook stickleback. Locally common. 

 ^^'eedy streams or ponds. Warm or cold waters; found sometimes in trout 

 waters if weeds are present. Browning Cove (Allegany Co.) ; Black creek and 

 triliutaries (Monroe Co.), September 2, Black creek (Monroe Co.), 1 9/10' 

 inclies. Food: 60% young aquatic insects {Ziigoptera, Chiroiiomidae) , 20% 

 Crustacea {Cyclops, Cladocera, Ostracoda } , 8% water mites (Hydracarinu) , 

 12% snails {Mollusca) . 



Gasterosteiis aculeatus cuvieri (Girard). — Two-spined stickleback. Present 

 in Lake Ontario and enters the mouth of the Genesee river. A small speci- 

 men was taken among weed beds near the river mouth on September 6. 



Pekcopsidae Trout Perches 

 Percopsis omisco-maycus (Walbaum). — Trout-perch. Moderately common 

 in rather large, warm streams. Prefers moderate current and mud or 

 ruljble bottom. June 29, Genesee river below Belmont dam, .3I/4 inches. 

 Food: Midge larvae {Chirotiomidae) . Crustacea {Cyclops), and adult fly 

 {Diptcra), and a black fly larva {Himulittm) . 



Centrarchidae SnnfisJies 



Pomoris sparoides (Lace]>ede). — Calico bass, strawberry bass. Kecorded 

 from Lake Ontario "especially in bays, ponds, and bayous with grassy shores 

 connected with or adjacent to the lake" (Smith 1890). This author says it 

 "seems to be especially abundant in Iiondequoit Bay (]\Ionroe Cd)." Probably 

 enters the mouth of the Genesee river in limited numbers. 



Amhloplites rupesfris (Kafinesque). — Rock bass, goggle-eye. Common in 

 the Genesee i-iver and largest tril)utaries and in the lakes and some ponds. 

 Tsually found in moderate or sluggish current, often among weeds. A good 

 food and game fish of the "]>an fish'' type. Four of the five specimens ex- 

 amined fiom this region contained only crawfish. These fish were from 5% 

 to 10 inches long and were collected in July, August and September, 1926. 

 An 8 inch rock bass from Silver lake August 17, 1926 contained 3 yellow 

 jterch. {Percn fiavescens) each about 1 V2 inches long and had also eaten a 

 fragment of a water plant {Valli^veria.) . 



hJupomotis gihhosus (Linnaeus). — Sunfish. "pumpkinseed." Common in the 

 lakes and in many ponds. Present in sluggish parts of the Genese? river and 

 in its largest tributaries but is rather rare in most streams. Common in 

 Black creek ( ]\Ionroe Co. ) in weedy places. Xot as useful a food fish as the 

 ])receding species due to smaller size. September 2, Black creek (Monroe Co.). 

 3'/8 inches. Food: 13 midge larvae {Chironomidae) and one crustacean 

 ( Hyalella kvickerhockeri) . 



Micropterus dolomieu Lacepede. — Small-mouthed black bass. The com- 

 monest game fish of the region. Common in the Genesee river throughout 

 most of its course. The most southern record for the river was \Vensville 

 (Allegany Co.). Xo specimens were obtained below Rochester falls. Mcd- 

 eiately common in Conesus and Hemlock lakes. Rare in Silver and ap- 

 j)arently absent from Honeoye lake. Occurs rather commonly in large, warm 

 tributaries of the Genesee river. One of the gamiest of fishes. Maintains 

 itself well by natural spawning in the river. The food of 13 s])ecimens from 

 the Genesee region taken in July, August and September was: crayfish 56%. 

 aquatic insects 24.2%, minnows (1 stomach) 7.7%, sunfish (1 stomach, 

 Eupomotis (/ihhosus)7.7(fc' suckers (1 stomach, Hypentelium niyricmis) 3% 

 land insects (1 stomach) 1.4%. These bass were from 7^/4 to 121/4 inches ^ong. 

 July 6, Caneadea creek (Allegany Co.). A bass 1 inch long had eaten small 

 mayriy nymphs {Ephemerida) , midge larvae {Chironomidae), a small flv 

 {Ifipiei'a), and small Crustacea (Phyllopoda, Copepoda) . August 8, Honeoye 

 cieek. 4 bass from 2 to 4i/^ inches taken in water polluted V)y cannery waste, 

 had eaten numerous midge larvae {Chironomidae) . June 28, Genesee river 



