Compare Visual System of Fish to Human

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Slide 24

The Cone Mosaic

Zebrafish (Row Mosaic)

Medaka (Square Mosaic)

Slide 25

The Cone Mosaic

Slide 26

Two major types of visual pigments:

Rhodopsins

Porphyropsins

Three other types that appear in some fish:

Kynurenine (3-hydroxykynurenine) (370nm)

Carotenoids (425-480nm)

Mycosporine-like amino acid (300-360nm)

Some fish, including the Japanese dace fish, carp and the common goldfish can see UV light.

Slide 27

Visual System of Billfish (marlin)

Vision concentrated in forward and backward directions

Able to resolve 10cm object at 50m (typical for fish)

Billfish has larger than average eyes which don't improve visual acuity, but are better able to see while moving at high speeds

Adaptation for predator

Slide 28

Visual System of Billfish (marlin)

Color photoreceptors concentrated in part of eye that faces up

Part of eye that faces down contains photoreceptors sensitive to light

Adaptation for clear-water environment