02-24-2007, 04:51 PM
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"so i have been informed recently......... a fish excretes a chemical around it,which itself is like a growth hormone, the more room it has the more it will excrete. wen it starts to run out of space, the chemicals will b reduced and the fish will grow slower, eventually, once the fish really has no space to grow at all, the release of chemical becomes so small that the fish is therefore stunted, and will grow no larger, but this in itself is not healthy for the fish. all fish should have enuff space to max out in size, for health and happiness!!! correct me if am totally wrong on this, but i was informed by a pet store guy who has had fish for 20+ years"
I have a pretty hard time believing this. The growth hormone is the same in fish as it is in mammals (I think) released from the pituitary gland, controlled by the hypothalamus and secreted into the blood. I can't see any reason why a fish would secret a chemical around itself--that just does not make any evolutionary sense. I'd ask that guy to check his science. But it is certainly true that fish become stunted if kept in too small of a space.