Oiiiida I.akf risliiS +21 



feet of water in Doiijjlas I^ke in sunniier. It inhabits deep, cold water, according 

 to Benslcy ('15. p. iJ). In the early part of the summer of 191C, from the middle 

 of June, when our field work henan, to July <». we found them common in the 

 shallow water of Uneida Lake. We found them in a stream ( I)<iU),'tass Creek) in 

 June, where they were in all probability siwwning. About Ithaca, X. V.. Han- 

 kinson used to take them in the marsh-bordered lower part of Fall Creek, close 

 to Cayuga Lake. They were es|)ecially apt to be found in a slough connected 

 with this stream. Reed and Wright ('09, p. 399) record them from these situa- 

 tions about Ithaca. 



l-'ooil. Two specimens (No. 456) from West Potter Bay, taken June 27. 

 1916, had many insect fragments in their stomachs. Reighard ('15, p. 231 ) notes 

 the finding of the chitinous ])arts of an insect larva in one fish. Few foo<l studies 

 apparently have Inren mafle of this species. 



Clemens ('-'4. p. 128) shows by a table the food oi nine Trout I'erch from 

 Lake Xipigon, Ontario. He found chironomids. aniphi|)ods, e])hcmerids. cntomo- 

 stracans, oligochaete worms, and some other invertebrates making up the iuod. 

 Greeley ('27, ]). 63) found a fish 3^ inches long from the Genesee River to have 

 eaten chironomid larvae, Cyclof's. an adult fly, and a black fly larva {Siniuliuiii ). 



Pistribitlioti Records. All of the fish caught during June and early July are 

 in the following collections: Xo. 40^1. Froher Hay; Xo. 413, Douglas Creek; Xo. 

 447. Potter Hay; Xo. 448. Hernhard Hay; Xo. 453, the lay just west of Pot- 

 ter Hay; Xos. 456, 464, Potter Hay; Xos. 500, 502, Lewis Point; Xos. 517, 518, 

 Sylvan Heach. Two dea<l fish (Xos. \22, 1J4) were found floating in the lake in 

 September. i<>i<), and one ( Xo. 550) on July 14. lyi'V 



Enemies and lUsease. Two of the dead six-cimens we found were di>eased 

 (Xos. 407, 350) : c»ne had water mold on its tail. Trout Perch are known to In; 

 afllicted with an eye disease that destroys one or Iioth eyes. Fxamples so diseasetl 

 have lieen found in Scrilw Creek in spring (Hcan, '07, p. 213). The disease is 

 ap|)arently bacterial and seems to have l>een of recent origin in Scrilia Creek. It 

 last> till freezing weather and affects many si)ecies of small fish, but never large 

 ones. There is considerable mortality among 'Irout I'erch in some regions. 

 Leathers ("ii, p. 231) found many dead in Saginaw Hay. CoHktI ("ifi. ]>. 34 1 

 found over 700 l)eached at I)ongla^ Lake. The species is eaten by Pike Perch 

 (Hean, '07, p. 215). 



r.coiwmie Relations, ."^iiue the species is evidently abundant in < )neida l.ake 

 and is preyed upon by that important game fish the Pike Perch, it is undoubli-illy 

 for this reason of econonnc value in the lake ami is worthy of considerable study 

 to find to what extent it is a f<MMl for Pike Perch an<! tither fishes. In lakes where 

 Pike Perch are to Ik* encourage<l. it may Ik- found profitable to plant Trout Perch. 

 On account f)f the accessibility of iheir spawning grotmds. the ease with which they 

 are caught on them, and the ease with which ca)>lured gravid females give up their 

 s|)awn, it ap|K'ars that Trout Perch might Ik- easily propagateil by hatchery metlio<t.<i 

 for the pur|Mise of stocking Pike Perch waters. Little ap|>cars to lie known of the 

 value of the s|)ecies as Kiit. but Hcan ('<>2, p. Mj) '«»>•'' that it is doubtless excellent. 



References. Rean. 'nj. "02. "1)7; Hcnsley, '13; Clemens. 'j\. "24: Collicrt 'lf>; 

 ForJx-s and Richardson. '(*); Greeley, 'jy: Jordan and Kvermann. '"/i; Leathers. 

 '11 ; Nash, "08; Reed and Wright. 'o<>: Reighard. '13: Wright and Allen. "13. 



