Specifications

SURFACE LAYER

ABSORBS HEAT

FROM THE SUN

EPILIMNION

THERMOCLINE

MOST PRODUCTIVE

ZONE FOR FISHING

HYPOLIMNION

While some fish have a wider temperature tolerance than others, each

has a certain range within which it tries to stay. Schooling fish sus-

pended over deep water lie at the level that provides this temperature.

We assume they are the most comfortable here.

The temperature of water in the lake is seldom constant from top to

bottom. Layers of different temperatures form, and the junction of a

warm and cool layer of water is called a thermocline. The depth and

thickness of the thermocline can vary with the season or time of day. In

deep lakes there may be two or more at different depths. Thermoclines

are important to fishermen because they are areas where fish are active.

Many times bait fish will be above the thermocline while larger game fish

will suspend in or just below it. The SupraPro I.D. can detect this

invisible layer in the water, but it will need to be in the manual mode and

the sensitivity will probably have to be turned up to see it.