EEB382H1 Lecture Notes - Lecture 2: Deep Sea Fish, Aphid, Antiandrogen
23 Sep 2016
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Having vertical bars (especially freshwater fish: break your image up so easy to hide in grasses. Can also have camouflage for sit and wait predators: ex: sturgeon sit in the weeds to hide. Camouflage is the most obvious use of colour pattern. Some flatfish can change their colours: we don"t know how they do it but we know its visual because when you cover their eyes they don"t change colour. But in general fish don"t change their pattern quickly compared to squids and octopi and cuttlefish. Dark dorsal surface and silvery sides (sticklebacks) Silvery side (recall guanine crystals set down in very thin plates) Reflects all the light back (doesn"t scatter it) Looks like there"s nothing there because light comes down and bounces off so it looks to observer that light is passing right through. Doesn"t completely disappear but is good enough. How to hide from being looked down upon.
