gf just change color.. usually they get paler. altho sudden all over paleness can be
due to being put in light colored surroundings, or stress. Ingrid

sophie wrote:

In message , Geezer From The Freezer
writes

Lateral line is a sensory device that detects pressure changes in the water
they use this to detect if predators are near by.

thank you!

next: why are the silver fish's face and gills going pale gold? and why
does the fantail have different gill coverings (I'm sure that isn't a
technical term) to the others? (they seem to have an extra couple of mm
of very thin "frill").

Curiosity killed the cat. I hope it's not too irritating for everyone
else.



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