1. Three types of photoreceptive glycoproteinn
蒋康鸿

2. Reference
1.Rod and cones are two general types of sensory cells in retina.
2.There are several types of cones,each with a different photoreceptive
glycoprotein that responds to different wavelengths of light.
3.What kind of cones a fish have is depend on the habitat,and some fish may has different kinds of cones. That means the glycoprotein a fish has is depend on its habitat.

3. Three types of photoreceptive glycoprotein
1.Porphyropsins
2.Rhodopsins
3.Chrysopsins

4. Prophyropsins
Prophyropsins are sensitive to longer wavelengths such as yellow-red light,and those light will become weaker quickly in water.
Therefore,prophyropsins tend to be more common in fishes living in shallow areas or close to surface.

5. silver carp
bighead carp

6. Rhodopsins
Rhodopsins is more sensitive to shorter wavelength such as bule-green light which can penetrate further into water.
Those plycoproteins are common in fishes inhabiting in deeper areas.

7. blue shark
whale shark

8. Chrysopsins
Chrysopins are sensitive to short wavelength light such as deep bule light.
Because this kind of light has very high energy ,so it can penetrates furthest into water.
Certainly, this kind of piycoproteins can be found in deep sea fishes.

9. anglerfish

10. Thanks