WITH AN AQUARIUM KEEPER.
'■'Fish know colours,” said the keeper of an aquarium the other day. "They can distinguish between red and blue, or white and green, as well as you and 1. I’ll prove it.” He led the way to a tank in which were some rod and some yellow and some green fish, and in it were artificial grottoes painted respectively red and yellow and green. The keeper brushed the water with his hand, and the fish lied, the red ones to the red grotto, the yellow ones to the yellow grotto, and the green ones to the green grotto. “They know which colour shields them from observation best,” said’ ho. "Xow I'll change the grottoes, so as to prove my statement a second lime.”
He moved the grottoes to different places in the tanks and again disturbed the water.
The same thing followed as before. Each fish darted like a shot to the grotto of its own colour, where it knew it would be best concealed.
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https://paperspast.natlib.govt.nz/newspapers/PGAMA19070329.2.48
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Pelorus Guardian and Miners' Advocate., Volume 8, Issue 26, 29 March 1907, Page 7
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169WITH AN AQUARIUM KEEPER. Pelorus Guardian and Miners' Advocate., Volume 8, Issue 26, 29 March 1907, Page 7
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