Texas Nature Observations and Reminiscences Page: 71 of 322
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TEXAS NATURE OBSERVATIONS AND REMINISCENCES. 71
onic minnows, still encased in the This phenomenon of our minnow
egg membrane. being a viviparous fish. is also
This is a characteristic well known to my friend and forphenomenon
in the minnow-not mer city bacteriologist, Dr. Chas.
generally known
not even to A. R. Campbell, and we have both
some observant naturalists-that made experiments in this line of
these 'minutest of fish develop observation at the old Dreiss' latheir
offspring alive, a character
boratory on Alamo Plaza many
istic observed only in a few other years ago.
fish variety, as the majority of These fish have a very sharp
fish hatch their eggs out after eyesight; and the eyes are, prothey
have been laid. The minnow. portionately, very large; and tfhl
however, contains in its myriads of eye lens, on microscopic examinamore
or less advanced eggs a liv
tion, is very complete-a hveline
ing fish germ, in its meil
and exceedingly refractive crystal
PHOTOMICROGRAPH OF EMBRYONIC IN EGG MEMBRANE, INSIDE THE
MINNOW'S OVARIUM. (Considerably Magnified)
braneous egg surrounding, and as line and oval-shaped disc. For such
seen in the microscopic photo here
reason, it is plausable how these
in. And, that they breed alive minute fish easily find their prey,
young fish, can be easily seen if consisting of animalcules and vegan
old female minnow be put in etable matter; and they .also feed
a glass of water and observed for on the eggs and larvae of such ina
few days or weeks-according sects as the mosquito. And to the
to the advanced cycle of develop
latter they have easy access at
ment-and it will be noticed that such places where the mosquito
gradually a number of young min
deposits its eggs, i. e., at places
nows swim around the glass of wa
near the water's edge, where the
ter. In other fish species this small fish have access to reach the
process is not witnessed, as the eggs or larval mosquitoes. In its
ecrs are first laid and hatched out embryonic state, and as seen on
afterwards. the micrographic-photo herein,
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Menger, Rudolph. Texas Nature Observations and Reminiscences, book, 1913; San Antonio, Tex.. (https://texashistory.unt.edu/ark:/67531/metapth14396/m1/71/?q=menger/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Special Collections.