Great Falls daily tribune. [volume] (Great Falls, Mont.) 1895-1921, 1920-08-29
BIZ FREDERIC i
HA SKIN
poured into the trout streams every year
Three Kinds of Trout.

|
In this twenty million are included
bow trout, the native or black spotted
trout" and the eastern brook or red
speckled" trout The last variety has
been propagated with such amazing sue
cess in Colorado that the eastern states
| from whence it originally came are now
sending here for supplies of brook trout
| eggs with which to replenish their
streams. In fact, Colorado is now as
famous for its successful system of arti-
fetal propagation as it is for its trout
| The state controls seven different
lakes containing large quantities of
trout, from which millions of eggs are
obtained, and it operates II hatcheries.
On the day that we interviewed Com
missioner Paryin, he had just returned
| from trip to Trappers lake, the largest
| source of the native trout supply, from
which, he said, three million eggs had
| been obtained in three weeks. Taking
various photographs of the lakes and
| hatcheries from his desk, he explained
| the method by which artificial propaga-
| ton is carried on
1t seems that the three species Of fish
have different seasons for spawning.
The rainbow spawns first early in the
spring; the natives, or "black-spotted"
trout follow little later on, and the
brook trout spawn in the fall. When
| this season occurs the fish start to run
that is, they make a concentrated eff
fort to leave the lakes and go up into
| the streams, each female accompanied
BY male. The process of natural
spawning takes four or five days. At
this point, however, the state of Colo
RADIO interferes. It's fish experts follow
the fish, seine them out and put them
into pens, admitting one male to each
fhrnn Fd14 IaC, THr-, ln mn
squeezed from the female fish and the
milk from the male fish. The milk is
poured over the eggs so as to fertilize
them. after which they are put in cool
place to harden. Then they are washed
and packed in cheese cloth and wet moss.
HatchTng the Eggs.
In this impregnable form the eggs ar
rive at the various state hatcherles.
Here they are placed in troughs of wa
ter, heated and kept at uniform degrees
of temperature. In water heated to the
point of 50 degrees, the eggs will hatch
in four weeks, whereas if the tempera
weeks. The first sign of life is merely
black spot Then the head of the fish
appears attached to a tiny sack or belly.
The fish lives on this for eight or nine
days. at the end of which time it de-
velops into what Is known as fry"
Having reached this stage, it is still kept
In the trough for a certain period and
fed ground liver, which Mr.. Parvin says
is the best fish food ever discovered.
Until Mr. Parvin became fish commits
soner, the trout were always taken out
of the trough at the FRY" period and
distributed at once in the different
streams-a practice which lost the state
about IS per cent of its laboriousiy
Matched fish every year. The reason
was that the little fish could not stand
the sudden change of climate from their
well-heated nursery to the chilly atmos-
phpre of the mountain waters, and those
which were not quickly gobbled by the
older. larger fish were frozen to death:
Now. under the new system, the small
fry are removed to nursery ponds or
retaining ponds and allowed to stay
there for from eight to IS months until
they grow TO size known as finger
lings' AS 'fingerlings" they are large
enough and strong enough to take care
of themselves and rarely succumb to the
rigors of their new environment when
placed in the mountain streams.