Publication: Bass Matters
A Bass\' Sense of Sight | |
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><> ><> BASS MATTERS - January 25, 2006 ><> ><>
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Comment The Post Below...
Hello Anglers,
When fishing live baits for bass remember not to set the
hook until you can feel the fish. Too often people see
their cork go under and set the hook. Slack will be taken
up by the hook set and then the bass can feel resistance
and spit out your bait.
Remember you can comment on any story or read comments
by visiting: Bass Matters Blog
Enjoy a week of fishing!
Brock
email Brock
A Bass' Sense Of Sight
By Leo Watson
A bass' sense of sight is obviously a primary influence in
its behavior. Without good eye sight, bass would have a very
short life span. There have been extensive studies done to
determine just how well a bass can see, whether they see in
color or black and white, and whether they see better at
night or during the day. Tackle companies, as well as
biologists, and fisherman alike have an extreme interest in
the answers to these questions.
Eye sight plays an important role in the daily activities of
all predator fish. In most situations and conditions, sight
is the dominant sense used in seeking and selecting food.
The photo sensory cells in a bass’ retina consist of cones
( for color vision ) and rods ( for black, white and shades
of gray vision ). The bass' eyes can receive five times more
light than the human eye. This allows them to distinguish
shapes, sizes, movements and color patterns the human eye
can't! Bass do this under varying water clarity and light
conditions! Bass do not have eyelids so they can not blink
or close their eyes.
Continued...
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What they do have is a black pigment ( not present in the
human eye ) that shades the photosensitive cells of the
retina, which allows them to see well in extremely bright
conditions with no discomfort. This dispels the conception
that bright lights hurt the bass' eyes Even though they are
supposed to have a fixed focus pupil, bass have the ability
to adjust their eyes to varying light conditions. The lens
of the eye moves back and forth to change the roundness of
the eyeball itself. By doing so this influences the amount
of light entering the eye. Even though bass can spend a
great deal of time in the sun without discomfort, they will
often use a shady spot for ambushing prey. In fact, a feed-
ing bass will do just that!
The visual acuity of the bass increases approximately three
fold when looking into bright areas from shady ones. Forage
moving about in the bright sunlight have trouble seeing bass
in the shade, but the reverse is not true. The smart and
crafty bass positions itself to take advantage of its super-
ior vision. The bass has an extremely wide field of vision,
a full 180 degrees for each eye. This allows them binocular
vision in front and slightly upwards due to the overlap of
the 180 degrees of sight with each eye. The bass is most
effective at striking its prey and lures in their binocular
zone. The only blind areas for the bass exist from his side
fins back and under its belly. Research has shown that a
bass' vision increases with age.
A bass' eyes will continue to grow throughout its life
regardless of its body growth. This could very well be
another reason that lunker size bass are so difficult to
fool with artificial baits. The bass’ eyes are equipped for
both day and night time vision. During the daylight, the
cones in the retina move forward and the rods move backwards.
At night the movement is reversed and they use their rods
for black and white vision. Periods when light level
changes, such as dusk and dawn are interesting times. A
human's eyes adjust to the change quite a bit quicker than
those of a bass. It only takes about 30 minutes for most
human's eyes to adjust to these changes.
Continued...
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The bass is far less fortunate. At dusk the rods in the bass'
eye move forward in the retina for after dark vision. It
takes almost two hours for the bass' eyes to fully adjust for
night vision. At about two hours before first light, the
change back to daylight mode begins. Contrary to what most
during anglers have been taught, fishing maybe extremely
slow during the first two hours of dark and the last two
hours prior to daylight.
Color vision is very important to the life of a bass. Most
bass rely on their color vision for feeding, self defense
and for spawning signals. Tests have shown that bass have
excellent color vision and can easily distinguish between
closely related colors. According to research studies, they
can also tell the difference between different shades of the
same color. In closing this article, I hope I have shed some
light on the bass' sense of sight. Hopefully I have dispelled
some previous myths. This information should help all to
better understand how the bass' sight works.
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FISHING JOKES CORNER
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Two men take a wrong turn and walk into a room in the San
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One man looks at the other and tells the Justice of the
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Questions? Comments? email: Email brock
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END OF BASS MATTERS - http://www.gophercentral.com
Copyright 2006 by PENN LLC. All rights reserved.
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