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WATER TEMPERATURE AND THERMOCLINES
Waler
temperature
has an
important-if
not
controlling-influence upon
the activities
of all fish. Fish are cold blooded and
their bodies are
always
the
temperature
of the
surrounding
waler.
During
lhe
winter,
colder
water slows down their metabolisrri. At this
time, they
need
about a fourth
as much food as
they
consume in the summer.
Most
fish don't
spawn
unless the water
temperalure
is within rather
narrow
limits. Surface
temperature
meters such as the
LDT-3000
helps
identify
the desired surface water
spawning
temperatures
for various
species.
Trout can't survive in streams
that
gel
too warm. Bass and
OPERATION
SENSITIVITY
The unit is in the AUTO SEARCH
mode when it's first
turned on. The
micro-computer
automatically adjusts
the
sensitivity
and
range
to find
and lock onto the bottom.
The
digital depth
flashes "0" until it
finds and
locks onto the bottom. You can
leave the
sensitivity
in the automatic
mode or
manually adjust
it to
suit conditions.
You
may
need to increase the
sensitivity
to show fish
symbols
when
the
unit is in automatic. To do
this,
first
press
the SENS.
key.
The letters
'SENS" will flash on the
right
side of the
display.
A vertical bar
appears
on the left side of the screen.
(
See
below.)
This indicates the sensi-
tivity
level. To increase the
sensitivity, press
and hold the
up
arrow
key
until the
sensitivity
is at the desired
level. The down arrow
key
de-
creases
sensitivity
in the same manner. Notice how the
sensitivity
bar
moves as
you
change settings.
It will move
up
when the
sensitivity
is
increased.
You'll also see the
change
on the
display.
After
you've
finished
setting
the
sensitivity
level,
the letters "SENS" and the
sensitiv-
ity
bar will
disappear
after
eight
seconds.
83°
7B°
SURFACE
LAVER
ABSORBS HEAT
FROM THE SUN
EPILIMNION
770
760
75°
THERMOCLINE
SENSITIVITY
BAR
Most PRODUCTIVE
ZONE FOR FISHING
68°
VARIES IN DEPTh
DUE TO
WIND,
56°
50°
47°
20
5
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