Oiicida Lake l-ishes 437 



Leeches 

 Pisiiiola ptinilala ( \\-rrill ». IVarsc and AchtcnlK-rg ('20. p. 335). 

 Placobdclla parasilUu (Say). I'carst and Aditinher},' ( "jo. p. 335); Kycrson 

 (•15. p. 169). 



COPEPODS 



Erinisilus anlrarihidarum Wright. Evermann and Clark {'20. p. 300). 

 Eriiasilus iiuriilcus Wilson. Pearsc ('24, p. 182). 

 AchtUi'r,-s iimblopHlis Killicntt. Wilscm C\<}. p. 231 ). 



MoLi.rsKS 

 l.iimpsilus lutt-olii ( l^niarck ). Pearse ('24, p. 181 ). 

 Quadrula phacata (Say). I'earse ('24, p. 181). 

 Inio caiiipliiiiatiis. I^ffevrc and Curtis ('12. p. i(j8). 



liiotioniic illations. It is generally conceded that the iVrcii i> niu- i>t the 

 iK-st tahle fishes ohtainahk- from our fresh waters. Jordan and Kvenuann ( 03, 

 p. T,f>>>) say that as a jian-fish they do not know a better one among American 

 fresh water fishes. Sometimes the flesh has an ill flavor in fish from warm, weedy 

 waters ( Nash, '08, p. y2: Henshall. '03. p. if)8). but in such cases the fish should 

 Ix- skinne<l liefore cooking (I.e.). Pearse i'j^,. p. ij) made an examination of the 

 nutritive value of Perch flesh, using 64 fish from I--ike Mendota. averaging alwut 

 6' J inches in length. The results were as follows: water, pt.ji'^'r ; ash. 5.o«>'^o ; 

 jiitrogen. 2.44'; : fat. 2.S7',. One objection to the Perch as a f<M>d fish is the 

 tlif^iculty with which the scales are removed, but here skinning can l>e enij)loyed. 



The Perch is a fish of considerable commercial importance, and where netting 

 is permitte<l, as in the (ireat 1-ikes, it is taken in large numl>ers for the niarkets. 

 Ilankinson has priced them in markets in Detroit and <ither Michigan cities in 

 recent years and has found them selling at 250 to ^^^c a ]M»und, and there si-ems 

 to Ik- a (piick and ready sale for them. The largest numliers are soUl in the spring, 

 and at tluil time the majority of the fish which Ilankinson saw in the markets were 

 large females distenderl with eggs, ihe riK- is often discanled by the marketnian 

 who dresses the fish for the customer, but it is saved through rc<|uest an«l is 

 delicious when fried with the Perch. It is evident that there is consi<IerabIe waste 

 here, through the marketing of so n>any adults alMUit to spawn. There is mani- 

 festly a lack of concern for the future abundance of this useful sjiecies in the 

 (ireat !.akes. 



I.each ('27. ]>. 21 I st.ites that the Perch occupies an imi>orlant ]>lace in com- 

 mercial fisheries in the I'niled .States and is liighly esteemed, that from the (Ircat 

 I-ikes, ihf Potomac River, and the smaller lakes of the upjwr Mississippi N'allcy, 

 large quantities are taken every year by nieans of fyke nets, gill nets, traps, seines 

 and lines: and they find a ready market. He estimates the annual catch to be 

 5.7(x>.o<K) poimds, valued at $384.ofxi. alxiut Wt'"; lieing cretlite<l to the Circat 

 I--ikes. K«x'l/ ('i(>, p. 584) notes a decrease of Perch in I-ike Huron from a 

 maximtun recorded catch in |8<>> of i~4o.f^») |>ounds, to f>33.l88 |)ounds in i<)22. 

 He notes also a decrease for I-nke Michigan (p. 5'/)). kiscd on testimony of 

 fishenurn. In I -ike Krie. according to the tabtdate<l figtires (p. 5<)2) showing 

 I>ounds of Perch caught, there ap|>oars to \k a fluctuation in mimbers. Tlic largest 



