OiicitUt Lake l-islus 459 



('15, pp. 224, _'39; '13a. p. 104) an<l ICIlis an<l Roe ("17. j). 71 ) touiid them eating 

 the ejjtjs nf their own s])ecies; and when suckers were feeding ujhmi their eggs on 

 the spawning beds in Douglas I^ke, groups of the darters were aljout them. Ten 

 of these Log Perch had from 8 to 20 eggs of their own sjK-cies in their stomachs. 

 Bensley ('15, p. 47) gives the food of I'crcina caprodcs as minute Chironomus 

 larvae, small amphi|Kjds, crawfish, and Kntomostraca. ICverniann and Clark ( "jo, 

 \'ol. I. pp. 300, 430) found insect remains with heach fleas, Hosinitui. DupUitHi and 

 Chironomus larvae. Cole ('05, ]>. (kio) found it had eaten Carp eggs. Pearse 

 ( '18. p. 271 ) lists the food matter found in ly of these darters, averaging 3 inches 

 in length : fish eggs, 27.8% : insect larvae, 45.5' i ; insect pupae. ^J'^'i : adult insects, 

 1.7% ; amphi|>ods, 6.6',' ; cntomostracans, 0.3' i ; leeches, 2'i ; plant remains, 3.4^0 ; 

 algae, 1.7^; ; silt and (lehris, 57','. Clemens ('24, p. 140) shows by table very 

 completely identified food objects of five Log Perch. Chironomids constituted the 

 principal foo<l, but other aquatic insects and many cntomostracans also had lieen 

 eaten. Turner ( '21, j). 43 ) tabulates his fin<lings from the studies of 133 examjiles 

 of Pcriiiia cafrodcs and the subspecies zebra. Cojjcjjods and other cntomostracans 

 had l)een taken abundantly and appear to be the principal food, at least of the 

 darters under two inches in length. I^irvae of midges and other insects, amphi- 

 jKjds and worms were eaten in important numl)ers. Fish remains were found in 

 one little darter about i V< inches long. Turner's general conclusion concerning the 

 species is given on p. 55. as follows: "( )f the eleven s])ecies examined, Pcrcina 

 caprodcs most nearly meets the si)ecifications r)f generalization in its fo<Kl habits. 

 The iK-riods of infancy and of youth are well marked and the jieriiKl of maturity 

 is marked by an omnivorous liabit. It would also Ik' expirted that a fish with a 

 generalized food habit would find survival easy and would therefore In- abundant 

 and unifonnly distributed. .Ml these requirements are met. indeed the distribution 

 of I'crcina was identical with that of the i>erch in many |)l.-ices." DeKyke {'^2, 

 p. 3<j), in summarizing food studies of 51 I'crcina caprodcs from Winona I.akc, 

 Indiana, says that the s|)ecies is apparently f>ne of the most regular feeders among 

 all the s|R'cies examined in Winona Lake, with little or no change of fixKl as the 

 fish increases in size. The princijial foo<l he found to Ik small Crustacea, princi- 

 pally ainphipofls .and Cladoiera ; larvae of Chironomus and Trichoptera : and 

 epheinerid nymphs, (ireeley ('27, ]». '>4 t found seven crust.iceans ( (,"nifii»i<iriw>, 

 three ca«I<lice worms, .seven midge larvae, and an nnidentifie<l insect pujxT in the 

 stomach of Pcrcina caprodcs. 



fiislrihulion Records. The late sunimer collections from the shallow water of 

 the l.ike in MHi, contained few of these darters. The following, nude .at that time, 

 contained e;uh but one fish, except No. 8«> which b.ad four: \o. 7<>. n>outb of 

 Scrilia Creek; \o. 77. Bullhead Hay: No. :><. Baker Point: No. W.. P.Hl.lygut 

 Bay; Nos. <k). <<i, NLnple Bay: Nn. 100, Walinit Point : No. 102, Uidd Bay: No. 137, 

 Long Island. One was taken al this time in Chittenango Crwk (No. .S8 1 ; and 

 five from !^cril>a Creek (No. 75). In ( klolK-r. iwi.S. five were taken. These are 

 in collections No. 301). Lower South Bay. aiul No. 314, Brewerton. Most of these 

 <lartcrs were taken in June and July. H)i6. wlicn they were abundant in shallow 

 water. The following colleclioiis nia<le at that time containe<l them: No. 4(x>, 

 I*"roher Bav : No .\o\. Billingtoii Bay: Nos. .}n3. 4114. Sh.nckelton Point; No. 413, 



