Lake Maxinkuckee, Physical and Biological Survey 323 



fish was not discovered until the stern of the boat had passed over 

 it. There may indeed be cases where, although almost touched by 

 the bottom of the boat, the fish has been actually overlooked ; but as 

 the writer has noted, the shape of the nest is so often shown at the 

 surface of the water, that one can frequenly detect it before any 

 sign of the fish is visible. 



"Furthermore, the habit of the dogfish in accompanying its 

 young for a number of weeks after hatching gives the fish culturist 

 another valuable hint. With little difficulty many schools of young 

 dogfish can be found and destroyed. The very fact that the young 

 when alarmed draw together into a more and more compact mass 

 puts them readily into the hands of the collector — although on the 

 other hand, this habit has doubtless proved of great value as a 

 means of preserving them from rapacious fishes; for should the 

 young scatter at the first alarm, they could obviously be less per- 

 fectly protected by the parent fish. 



"In conclusion, accordingly, I think it is fair to assume that 

 whenever it becomes necessary, dogfish can be readily destroyed. 

 The fish themselves can be speared when they appear at the season 

 of spawning; their nests can be found and destroyed; and young 

 fish can later be taken, and in large numbers, when in company 

 with the male fish. I am led to believe that a single collector, 

 operating in a lake several miles in length, could in one season re- 

 duce the supply of dogfish in a very efi'ective way." 



Head 3.75; depth 5 to 6; eye 11 to 12; snout 5.75; maxillary 

 2.25 to 2.75; D. 48; A. 10 to 12; V. 7; scales about 10-70-12. 



Body long, not compressed; head moderate; mouth large, 

 slightly oblique, snout broadly rounded, lower jaw slightly the 

 shorter; maxillary reaching far beyond eye; eye small;* back 

 broad, not elevated ; caudal peduncle deep, somewhat compressed ; 

 dorsal fin very long, beginning well in front of ventral fins and ex- 

 tending to near base of caudal ; anal fin small ; caudal fin rounded ; 

 lateral line nearly median, directed slightly upward at each end. 



Dark olivaceous or blackish above, inclining to greenish, paler 

 below; side with traces of reticulate markings; lower jaw and 

 gular plate often with round blackish spots or irregular mottlings ; 

 fins mostly pale, somewhat mottled, especially the dorsal and anal ; 

 male with a round black spot at base of caudal above, surrounded 

 by an orange or yellowish shade; this spot usually not present 

 in the female. Length of male about 18 inches ; leng-th of female 

 2 feet or more. 



* In the young examined at the lake the eye is proportionally nearly twice as large as in 

 the adult, and the snout from .25 to .2 larger. 



