580 REPORT OF THE COMMISSIONER OF FISHERIES. 
lake. This was the so-called silvery lamprey, /cehthyomyzon concolor. 
I inquired of the fishermen if they had ever seen the lamper eels 
attached to fish, and they said, ‘‘ yes;” to the inquiry as to the kind of 
fish the reply was, °° arp.” On the 10th of August, 1902, I was 
assisting in making a seine haul of carp in the Sandusky River when 
one of the ashounen noticed a lamper ‘* about 5 inches long ” attached 
to one of the fish; it became detached, however, and escaped through 
the net before I could get to the place to see it formyself. Prof. 5. H. 
Gage tells me that in his aquaria at Cornell University the young of 
the SCiy uga Lake lamprey (L’etromyzon marinus unicolor) have become 
attached & carp as soon as they were transformed from the larval stage 
and had left the sand. As carp are abundant in Cayuga Lake, as well 
as most of the other lakes in which this lamprey occurs, it seems very 
probable that during its free-swimming life the latter may be one of 
the important enemies of the carp, as it has been found to be of many 
other fish (Surface, 1898). In fact, Surface (p. 212) includes carp 
among those fish he has found dead with the marks of the lamprey on 
them. 
Finally, under unfavorable conditions carp, like other fish, are sus- 
ceptible to the attacks of fungus growths. So long as the water is 
pure there seems to be little danger of this, for I have seen carp that 
had been penned for long times whose heads were much bruised and 
abraded, but which were free from fungus. On the other hand, some 
young fish which I attempted to keep in an aquarium at Ann Arbor 
were soon attacked by a Saprolegnia, and I was unable to keep 
them alive for more than a few weeks on that account. The usual 
treatment with potassium permanganate and by immersing the fish 
for a short time in strong brine afforded only temporary relief. 
Smiley (1886, p. 754) gives the following with regard to carp attacked 
by fungus: 
Statement of B. E. B. Kennedy, Omaha, Douglas County, Nebr., April 14, 1888. 
Funeus.—On visiting our fisheries yesterday I find that many of the young carp 
are affected with a kind of parasite or fungus, which proves fatal. With some it 
appears on the back, some will have a strip nearly around the body, and some about 
the fins and tail. This fungus is easily removed, and the skin or flesh under it has 
the appearance as if the spot had been blistered. Several hundred have already 
died, and many more are similarly situated, and, unless there is some remedy 
administered, all will be likely to die. We have separated the affected ones from 
the others, hoping to stay the spread of the disease, if itisone. Those that show no 
fungus appear all right and take food readily. 
Nore By Proressor BarrpD ON FuNGUs.—When the carp are taken from their 
winter quarters for our ae shipments there seems to be a general tendency to the 
de ee of thefungus. Itis probably due to the abrasions produced in handling, 
«Tn color Wen specimens agreed more Rieseie an fae dete npuon of TCR UOn castaneus 
Girard. 
