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The value of live food for aquarium 
fishes cannot be overestimated, which 
fact is clearly shown by the numerous 
articles appearing in these columns con- 
cerning the propagation of Daphne for 
the purpose. More recently “Enchytrae,”’ 
or white-worms, have entered the field, 
and I read with interest the article by 
Wie Crlpilcicedew NowAine) Birr Decem= 
ber, 1916, page 43. His statement re- 
garding their use as a food for aquar- 
ium fishes, “especially during the winter 
months when Daphne is scarce and un- 
obtainable,” leads me to ask: Why not 
feed Corethra? So little has been said 
about this particular larva, well-known 
and used with success by most of the 
members of the Milwaukee Society, that 
I often wonder whether these ‘‘subma- 
a SP Oa 6 Os Ot 
Corethra: A Winter Fish Food 
GEORGE HEMSING 
The Nets Showed a Yellowish Mass of Corethra 
6 6 a at a 8 Oe a 
a a 
fF 
3 
rines” lurk only in waters adjacent to 
our fair city. This, of course, we know 
is not the case, for we read much about 
the gathering of Daphne, and while so 
engaged, others must surely be getting 
Corethra, as they occur in ponds of the 
same nature. 
To the uninitiated a word about larval 
Corethra may not be amiss. It is a long, 
narrow creature of extraordinary trans- 
parency, resembling glass. In fact, thou- 
sands may be in the pond under exami- 
nation, large numbers practically on the 
surface, and yet they can hardly be seen. 
They are known as “phantom larvae,” a 
name little to be wondered at, for no 
sooner is one noticed than it as mysteri- 
ously vanishes, only to reappear the very 
next moment possibly half an inch from 
