Texas Game and Fish, Volume 9, Number 4, March 1951 Page: 7
This periodical is part of the collection entitled: Texas State Publications and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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n Texas
It is necessary to number the pens
because records on the progress of
spawning must be made from day to
day.
Stocking the Pens
At all hatcheries, the hatching
pond is filled with water about the
15th of April. The catfish brood stock
is then collected and placed in hold-
ing troughs. During this operation the
fish are carefully scanned for leeches
Chief Aquatic Biologist
and parasitic copepods. Should some
be found-and they usually are in the
mouth of the fish-they are removed
from the fish with forceps or tweezers.The job of sexing now begins.
Figure 4 shows very clearly the dif-
ference in external characters of the
urogenital opening of male and fe-
male. It may be seen that the male
opening protrudes. Occasionally the
sex of fish being checked does not
show clearly. When this happens, a
broom straw is rubbed back and forth
longitudinally over the vent, as the
straw will always hang on the vent of
a male. The swimming catfish in
figure 3 are the same fish seen in
figure 4. It will be noted that the
male has a much broader head. Prac-
tically all our hatcherymen are able
to sex their catfish correctly.
After the males and females have
been separated, the fish are paired
off. At this stage a most important
matter must not be overlooked. In theTexas system of catfish cultivation,
the male is used to tend his eggs and
see that they are properly fanned.
After spawning, the female will try
to get to the eggs and eat them. Con-
sequently, the male must be a larger
fish, able to fight off the female. If
the male is paired with a larger fe-
male, invariably the male will be
killed and the spawn eaten. There-
fore, the male must be paired with a
smaller female in each of the pens.
Male catfish may be used more than
once; some of the males in the hatch-
eries have successfully hatched three
spawns.
Spawning Receptacles
Originally 10-gallon milk cans (see
figure 5) were used for spawning re-
ceptacles. Millions of catfish wereFigures 3 and 4. Photo below shows male (right) and female
catfish. To the right, same male (left) and female catfish./
MARCH, 1951
7
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Texas. Game and Fish Commission. Texas Game and Fish, Volume 9, Number 4, March 1951, periodical, March 1951; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1588346/m1/9/?q=%221951~%22: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.