Re: NANFA-L-- Re: Chinese Sturgeon on AquaBid
Thu, 11 May 2006 23:59:02 +0700

Even with much worse mortality many aquarium escapees still become
established out of their natural range. On the other hand if a
million fry of endangered large fish are released and 1/10 survive to
adulthood the other species may become endangered instead [and it
doesn't have to be predatoy species] and the water body may not be
able to support them all.

Generally how many topminnows are bred and reared each year though?


Peter Unmack wrote:
> On Thu, 11 May 2006, Jerry Baker wrote:

> I was recently-in-a friends place in a tank with mostly guppies and a few
> other fishes, and you could have done anything to them and they would
> still be swimming around-in-the front of the tank completely unphased.
> I think it is that natural fear of many things that really helps these
> guys survive in the wild. But you also have to keep in mind that in
> captivity, most individuals survive, whereas in the wild very few survive.
> Thus when releasing fish into the wild, you would expect to have massive
> mortality just as if they were being born in the wild. Thus introducting
> 1000 topiminnows might only really be equivalent to establishing 10 fish
> in the population.
> Cheers
> Peter Unmack
> Provo River, UT
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