RE: NANFA-- Old Captive Fish

Hoover, Jan J WES (
Sun, 7 Nov 1999 10:50:40 -0600

>One thing I have noted about captive fish is that they live longer.
I have have some big, slow Heterandra formosa that are 3 years old.
In nature, they would be "picked off" by big fish due to their lack
of quickness.

I've noticed the same thing about shiners. Coastal shiners (Notropis
petersoni) from peninsular Florida are annuals, but I had one in captivity
for three years. Topeka shiners (N. topeka) usually live 2-3 years but
full-sized adults that we aquired 18 months ago are still going strong.
Maybe the absence of seasonal cues (changing water temperature, daylight,
etc) or interruption of reproductive cycyles prevent the fishes' internal
"senescence switches" from getting flipped on.

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