Lecture 7 Sensing Fish

Question 1

Roles of colour in fish (6)

Answer 1

-countershading
-mimicry
-disruptive (stripes to break up outline)
-disguise (camouflaged as another object or plant)
-camouflage
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Question 2

colour change (2)

Answer 2

-Schematochromes are mirror like surfaces filled with chromatophores
-change happens when the nervous or endocrine systems change the location of chromatophores and concentration of pigment

Question 3

Bioluminescence (3)

Answer 3

-occurs in photophores (cells filled with symbiotic bacteria)
-reaction without heat (luciferin+ATP+O2 = luciferase = light)
-can be used for communication, obtaining prey, avoiding predators

Question 4

production of electricity

Answer 4

Electricity comes from modified muscle cells that stack up on each other like batteries building up voltage differentials