<Randy:

<A nonadverse example is the common
goldfish (Carassius auratus), which is found throughout the United States,
but rarely achieves high densities.>


Actually, I've seen harm from Carassius auratus.  Some years ago, at the Hanford site, someone(s) dumped goldfish in an asphalt lined pond containing PCBs.  The goldfish flourished and grew.  A rookery of Heron's found the goldfish to be good eating.   A Heron researcher in a rain coat, using buckets, collected the bird 'droppings' that were found to have very high, potentially harmful levels of PCBs.


As per C. auratus rarely achieving high densities, unless illegally released into streams and ponds, it's hard to reach high densities in goldfish bowls.  The spread to empty bowls usually requires a human, unlike the fish in finding Nimo that manage the trick.

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