398 



June j-8. James Trent, fisherman, reports carp spawning in con- 

 siderable numbers in Clear Lake, on the "Middle Ground" — a brush- 

 covered ridge under shallow water. 



SEARCH FOR YOUNG CARP, SEASON OF I909 



Young carp under six inches seem very rare about Havana. From 

 July I to December 31 we succeeded in finding them only twice, and 

 in very small numbers: once in one of the mud-bottom "horseshoe" 

 ponds north of Spoon River bridge (C, B. & Q.) ; and once in a 

 small pond along the Crabtree dredge ditch opposite the foot of 

 Thompson's Lake. 



FEEDING HABITS OF YOUNG CARP IN FIELD, AND IN LABORATORY 



AQUARIA, I9IO 



May 2^. Young carp y2 to }i in. long observed to snap at and 

 swallow large Bntomostraca (Cladoccra and Copepoda), in labora- 

 tory aquariuuL 



July 14. Specimens 1 to 1/2 in. long, observed to attack and swal- 

 low, with difficulty, full-sized specimens of a small amphipod crusta- 

 cean {Hy alalia knickerbockeri), 3 to 5 mm. long, in laboratory aqua- 

 rium. 



August jp. In a laboratory feeding experiment made August 19, 

 young carp i to 2 inches long were fed mixtures of coarse plankton — 

 Bntomostraca, Hyalella, small insect larvse, WolfHa, etc. — and killed 

 after thirty minutes. One specimen i->^ in. long was examined, and 

 had eaten several Hyalella and one Cyclops, but no U'oltl^a or other 

 vegetation. 



Ace. No. 28^ji. The food of two specimens of this collection, 

 made in Danhole's field June 3, 1910, was as follows: One (^ in. 

 long) had eaten nothing but three large Cyclops; the other (■)'^ in. 

 long) had eaten i Cyclops, i Alona, 4 ostracods (Cyprisf), and a 

 trace of Spirogyra. It was noted that Cladocera, Copepoda, and Os- 

 traeoda were very abundant June 3 in cheese-cloth seine-haul. 



Ace. No. '28^60. A specimen i^ in. long taken from the head 

 of Liverpool Lake in July, 19 10, had gorged itself with about a dozen 

 Cyclops. No vegetation had been eaten except a trace of Spirogyra. 

 Nothing of the nature of mud was to be seen in the stomach. 



Is it possible that the reason for the sudden disappearance of the 

 carp fry from this place between July 7 and August 1 1 was that they 

 had exhausted the supph'^ of Bntomostraca — to which they had accus- 

 tomed themselves for some weeks- — and that they left to find new 

 feeding grounds ? 



