Below is a melanophore index from fish scales that goes from the most aggregated

Question

Below is a melanophore index from fish scales that goes from the most aggregated melanin (1) to completely dispersed melanin (5). What is the effect on the color (shade) of the fish of these changes in dispersal? What control systems affect the changes in shade? If something affects the dispersal of melanin by acting at the cell membrane, what mechanisms might be involved? Caffiene is a phosphodiesterase inhibitor, and increases the intracellular cyclic AMP, which causes melanin dispersion. On the one hand, chemical sympathectomy, which removes sympathetic input to the skin causes permanent darkening, also. And, on the other hand. MSH (melanophore-stimulating hormone) causes a strong decrease in reflectance of the skin...the melanin is dispersed. How can you put these observations into a control scheme that involves the autonomic nervous system as well as the endocrine system?

Explanation / Answer

in the prescence of melanin , the color of the fish is dark brown or black. with the decrease in melanin, this shade or colour of the fish lessens.

melanosome, an organelle fpund in animal cells which is responsible for the storgare aand transportation of melanin, is responsible for this color change.

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