Question

Can you help me guys ?? (theme: Navigation in Fish)

Answer 1

For salmon that spawn on very precise dates of the year, the idea of an internal
biological clock is not an unreasonable expectation. Indeed, laboratory experiments in a variety of species have demonstrated that fishes may be trained to use an artificial sun to orient in a particular compass direction. Moreover, fishes trained to orient in this manner can correctly compensate for diel and seasonal variation in the position of the sun.

The sun itself is often obscured and, thus, is not always a reliable orienting cue. Nonetheless, fishes may continue to orient when the sun is obscured by using polarized light as a directional cue. The ability to detect and dis­criminate planes of polarized light has been demonstrated in numerous species. However, there is some evidence that polarized light would be a reliable orienting cue only during crepuscular periods (dawn and dusk) when the percentage of polarized light is as high as 60–70%. During the day, the percentage is far lower (<40%), and may in fact be below the detection threshold of most fishes.

Answer 2

have you any reference to tell me how it works?
pleasee

Answer 3

how it's navigation work?

Answer 4

i mean "Polarization Vision in Fish to navigate"

Answer 5

They use magnetic receptors

Answer 6

yes i knew, they use magnetoreceptor cells to navigate using geomagnetics

Answer 7

but, in this case "using Sun to navigate during crepuscular periods (dawn and dusk)",

Answer 8

I am reading… it would suggest that they recognize light polarization and use that as well as a homing device or navigation guide.

Answer 9

do you have an access to science journals? I am going to look for electronic copies via my library. I'll be back. I studied Salmon but this didn't fully came out, maybe because this is relatively a new release and my text came out the year prior.

Answer 10

yes i have, i have an access to sciencedirect, aps, and elsevier

Answer 11

oh okay it's where I am looking now and I see some UV-polarization vision. My guess that would be akin to bees.

Answer 12

i got http://www.jstor.org/stable/3066642

Answer 13

yeah we have the same author.

Answer 14

nice.., I'm downloading now

Answer 15

it is stupendous how nature works, they have the same cones and rods in their vision, but a little tweak here and there they are able to see better spectrums.

Answer 16

it appears that there's a wide study early on about this.

Refraction polarization of skylight; Snell's window; Underwater polarization vision; Sun compass navigation; Palaemonetes vulgaris; Oncorhyncus mykiss