Manual Lowrance X-25B (page 20 of 30) (English)

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Large fish will arch, but turn the sensitivity up in deeper water to see the

arch. Because of water conditions, such as heavy surface clutter,

thermoclines, etc., the sensitivity sometimes cannot be increased

enough to get fish arches.

One of the best ways to get fish arches is to expand or “zoom” a

segment of the water. For example, from 45 to 60 feet. The smaller the

segment, the better the screen resolution will be. The easiest way to do

this on the X-25B is with the Zoom feature. This feature expands the

echoes, making it easier to see detail. For the best results, turn the

sensitivity up as high as possible without getting too much noise on the

screen. In medium to deep water, this method should work to display

fish arches.

If you see fish signals when the unit is in the manual mode, but don't get

fish symbols when Fish I.D. is on, try increasing the sensitivity.

WATER TEMPERATURE AND THERMOCLINES

Water 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 water. During the winter, colder

water slows down their metabolism. 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 temperature is within rather

narrow limits. The surface temperature meter built into the X-25B helps

identify the desired surface water spawning temperatures for various

species. Trout can’t survive in streams that get too warm. Bass and

other fish eventually die out when stocked in lakes that remain too cold

during the summer. While some fish have a wider temperature toler-

ance than others, each has a certain range within which it tries to stay.

Schooling fish suspended 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.

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Lowrance X-25B Manual

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