387 



c. The Transportation of Fishes. 



In collecting fishes for such experimental work .they may be se- 

 cured and brought to the laboratory in numbers if only a very small 

 quantity of water is used. In general it is best to allow the dorsal fins 

 of sunfish, basses, crappies, and suckers to protrude from the water. 

 Minnows on the other hand, live best in about 3 inches of water. In 

 this way many fishes may be safely brought in without the usual 

 I^.bor of carrying a quantity of water. 



4. FISHES USED. 



The fishes used in this experiment belong to the species mentioned 

 below. 



Common name 



Orange-spotted sunfish 

 Blue-spotted sunfish 

 Blue-gill 



Long-eared sunfish 

 Rock bass 



Small-mouthed black bass 

 Large-mouthed black bass 

 Blunt-nosed minnow 



Steel-colored minnow 

 Common shiner 

 Golden shiner 

 Common sucker 

 Bullheads 

 Brook silverside 

 Rainbow darter 



Scientific name 

 Lepomis humilis Gir. 

 Lepomis cyanellus Raf . 

 Lepomis pallidiis Mit. 

 Lepomis megalotis Raf. 

 Amhloplites riipestris Raf. 

 Microptenis dolomieii Lac. 

 Micropterus salmoides Lac. 

 Pi me p hales notatns Raf. 



Notropis zuhipplii Gir. 

 Notropns corniitus Mit. 

 Ahramis crysoleuca Mit. 

 Catostomus comniersonii Lac. 

 Amciurus nchidosns LeS. 

 Labidesthes sicculus Cope 

 Btheostoma coerulenm St. 



Abundance 



Abundant 



Common 



Common 



Common 



Common 



Common 



Common 



Very 



common 



Abundant 



Abundant 



Abundant 



Common 



Common 



Occasional 



Common 



The small sunfish, Lepomis humilis, was used as a standard fish. 

 It is only about 4" long when adult, is widely distributed in Illi- 

 nois and without value as a food fish. A suf^cient number of other 

 fishes were studied to make its relative sensitiveness clear, and min- 

 nows and one of the basses were nearly always used in reaction ex- 

 periments. Minnows were used also to show toxicity. 



The condition of individual fishes is also a matter of importance. 

 In a few cases fishes with obvious external protozoan parasites were 

 killed in coal-tar products, and in every case they died sooner than the 



