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- I'm a Fish!
I am surprised that you made such a silly comment. Sharks and other fish really don't need to see a thing because they have a great sense of small and a lateral line. I am sure dolphins have something similar.
This must be one of those "internet not getting the real meaning out" situations...you can't really mean what you said literally.....????
Vision is a critical sense over reef or pelagic invironments, in the top 500 feet.
When we have ultra high vis days, you can even see very different behaviors in many of the fish, from very low vis days, due to the extreme differences in hunting behaviors and visual abilities of predators.....Many of the prey species that hide during 100 foot vis days, are out swimming around and feeding on 10 foot vis days--because the visual based predation is far less effective on these bad vis days....
Then there is the body language component, where the vast majority of fish species use their own and other species body postures and movements to draw conclusions about intent, as well as to elicit a specific reaction from other fish....
This obvious examples like symbiotic and comensal relationships--like a turtle in the "I want to be cleaned" posture, and then the way Spanish Hogs respond and clean them........or the territorial posturing response of many reef shark species, if a large competing predator overlaps into their hunting range....I could show visual based examples for many pages--eyesight is a critically important sense for fish in the portion of ocean where light is present.....and even at great depths below 15,000 feet there is bio-luminescence --which is used in communication by many species, including giant squids
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