Native Trout
Outlive Their
Hatchery Kin
The majority of fish caught
by anglers come from natur
al reproduction, even from
lakes and streams in which
hatchery ' fish have .been
stocked, reports Edwin L.
Cooper, fisheries biologist
for the Agricultural Experi
ment Station, the Pennsyl
vania State University.
Cooper says this statement
is verified in a review of 164-
world-wide studies of trout
management, published un
der the title “Trout Stocking
as an Aid to Fish Manage
ment,’’ Bulletin 663 of the
Agricultural Experiment Sta-
• ..." ;
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*t J«s 'rt - ■
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Or
Call your Eastern States Local Representative
tion. The bulletin is free on
request from the Agricultur
al Mailing Room, University
Bark, Pa.
Essential differences be
tween native trout popula
tions and domesticated,
hatchery trout should be
recognized, Cooper feels. It
is too much to expect hatch
ery trout to survive in a na
tural environment at the
same rate as wild fish, in his
opinion.
Based on the large number
of trials by different investi
gators, he reports that re
turns from hatchery trout
are likely to occur when
trout of any size are slocked
in lakes, ponds, or streams
where there is little or no
competition from fish alrealy
present, or when catchable -
sized trout are stocked where
steron 99 kills weeds that other
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heavy fishing is exerted
promptly. Under other cir
cumstances, recovery of
stocked fish is likely to be
low, the studies show.
Trout lay many eggs, he
points out and 400 young are
a common, average brood ol
fry. Oi these, he declares,
only two need to live two
years, the length of time re
quired for'maturity, to main
tain the original pair of
stock fish. This' amounts to
only one-half of one per cent
survival.
Opinions as to the type of
trout management wanted
by anglers range, he says,
from “no stocking; fish for
fun only” to “completely ar
tificial propagation, putand
take fishing ” Accurate ap
praisals of the desires of the
fishermen seldom are made,
KIRKWOOD, PA.
Lancaster Farming, Saturday, April 2, 1960 —
NEW BARN EQUIPMENT CARE FOR LAMBS
As a milk conveyor Ivan Bad luck during the lam-
Parkin, Penn State exions- bing season too often is the
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Other types of milk con- minds Frank Krcuzberger,
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line system and the dumping ist The shepherd must care
or pumping station. for his flock.
[ BIG FIELD DAY I
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13