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Northern Pike Esox lucius
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Identifying
characteristics: (Native Fish) Single
dorsal fin, light colored spots on darker body,
upper half of gill cover and entire cheek has
scales.
As predators, northern pike
can have significant impact on their prey
species. As with muskies, pike lurk in the cover
of vegetation in the lake’s clear, shallow, warm
waters near shore, although they retreat
somewhat deeper in midsummer. Pike consume large
numbers of smaller fish – about 90 percent of
their diet – but seem willing to supplement
their diet with any living creature their huge
jaws can surround, including frogs, crayfish,
waterfowl, rodents, and other small mammals.
Their preferred food size is approximately one
third to one half the size of the pike itself.
Great Lakes pike spawn in the
shallows in April or May, right after the ice
leaves, and before muskies reproduce. As a
result of their eating habits, young pike grow
rapidly in both length and weight. Females
become sexually mature at age three or four
years, and males at two to three years. Beyond
sexual maturity, pike continue to gain weight,
although more slowly. Great Lakes pike have an
average life span of 10 to 12 years.
Pike eggs and new hatchlings
(which stay inactive, attached to vegetation for
their first few days of life) fall prey in large
numbers to larger pike, perch, minnows,
waterfowl, water mammals, and even some insects.
Larger pike have two primary enemies – lampreys,
and man. Spawning adult northern pike, exposing
themselves recklessly in the shallows, are
vulnerable to bears, dogs, and other large
carnivores.
Northern pike flesh excels in
flavor, thus making them a doubly rewarding game
fish. Since their skin has heavy pigmentation
and an unappetizing mucous coating, most people
skin them or scale them carefully. |
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Lake trout Salvelinus namaycush
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Identifying
characteristics: (Native Fish) Two
dorsal fins including one adipose fin, light
spots on darker gray background, lower fins
edged with white, tail forked, 11 rays in anal
fin.
The lake trout or "salmon
trout" as it is sometimes called, is the largest
trout native to the Great lakes and other
Michigan lake waters. This fish strongly prefers
a water temperature of 45-55 degrees F. Thus,
while the lake trout may be found in shallow
water only 10 to 15 feet deep in spring and fall,
it follows these frigid water temperatures to
depths of 100 to 200 feet in the summer and
winter. This restless denizen of the cold, deep
waters is a true wanderer, often ranging many
miles in search of prey. A relentless hunter,
the lake trout feeds primarily on other fish.
Although it seems to have a peculiar penchant
for ciscoes, it also concentrates on alewives,
smelt or sculpin (dead or alive), and sometimes
takes crustaceans, insects, other fish, and even
small mammals.
Many lake trout seem to
return each fall to use the same spawning beds,
although some don't show this homing behavior.
The eggs are deposited after dark, often on
shoals. Young lake trout become sexually mature
at 6 or 7 years of age. The average adult weighs
in at 9 - 10 pounds but some individuals weigh
up to 50 pounds (the Michigan record is 61 1bs
and 8 oz). The life-span of the lake trout may
exceed 25 years.
Parasitization by sea
lampreys severely reduced the lake trout
populations in Michigan from 1935 to 1965.
Chemical contaminants and over-fishing pressures
have also contributed to the problem, but with
better fishing management and control of the
lamprey and pollution problems, the invaluable
lake trout is coming back.
An unusual from of lake trout
occurs in the deep waters of Lake Superior, and
is called a cisowet. This "fat trout" spawns at
depths greater than 300 feet and is edible only
when smoked. In Lake Superior individuals exist
covering the entire spectrum from this odd type
to the familiar form of lake trout.
Lake trout have also be
successfully hybridized with brook trout to form
the "splake," obtained by fertilizing lake trout
eggs with brook trout sperm. Splake released in
the Great Lakes and recaptured 5 or 6 years
later have weighed up to 16 pounds. Splake are
intermediate between the parent species in
appearance.
Lake trout are avidly sought
after by both commercial and sport anglers, for
food as well as for the sport.
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Brook trout Salvelinus fontinalis
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Identifying characteristics: (Native
Fish) Brook trout have a long, streamlined
body with a large mouth that extends past the
eye. Color variations include olive, blue-gray,
or black above with a silvery white belly and
wormlike markings (vermiculations) along the
back. They have red spots sometimes surrounded
by bluish halos on their sides. The lower fins
have a white front edge with black and the
remainder being reddish orange. The tail fin is
square or rarely slightly forked. During
breeding time in the fall male brook trout can
become very bright orange-red along the sides.
The brook trout is native to Michigan’s
waters and is the state fish of Michigan. They
can be found throughout most of the state in
many creeks, streams, rivers, lakes, and in the
Great Lakes. Brook trout require cool, clear,
spring-fed streams and pools. They can be found
under cover of rocks, logs, and undercut banks
and have been described as stationary. Larger
brook trout often inhabit deep pools moving to
shallow water only to feed. They prefer
temperatures from 57–60 degrees F.
Spawning generally occurs in the months of
October and November. Mature brook trout seek
riffle areas with gravel in spring-fed streams,
spring seepage areas of ponds, lake shores with
swift currents, or lake bottoms where
groundwater seepage occurs for spawning. Female
brook trout use their tails to create a spawning
bed (or redd) in gravelly areas. Redds may
measure 1 – 2 feet in size. Female brook trout
can produce between 100 – 400 eggs depending
upon the size and age of the individual. After
spawning the female covers the eggs with gravel.
Brook trout eggs must get continous amounts of
oxygen in order for the eggs to survive.
Depending upon water temperatures the eggs will
incubate 2 to 3 months before hatching into sac
fry.
The sac fry remain in the redd until their
yolk sac is absorbed. Then, when they are about
1 ½ inches long, they venture away from the redd
to feed. It takes about 2 to 3 years for them to
mature and they usually do not live longer than
6 years. Brook trout living in streams often
reach sizes between 7-9 inches. Great lake brook
trout or coasters can attain larger sizes up to
25 inches and 10 pounds.
Brook trout have been described as voracious
feeders with the potential to consume large
numbers of zooplankton, crustaceans, worms, fish,
terrestrial insects, and aquatic insects.
Ephemeroptera, Trichoptera, and Diptera often
make up a large component of their diet. However,
they will often feed on whatever is most readily
available.
Brook trout are avidly sought after by sport
anglers, for food as well as for the sport. They
can be caught by using various bait and lures
including worms, crickets, grasshoppers, wet and
dry flies, spoons, and spinners. |
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© Copyrights Domaine
Pipmuacan 2008
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