Water Gardening: Name that fish!?, 1 by soivos

soivos wrote:
Can anyone help me with this?
Is this a goldfish of some sort or is it something else that somehow came in from the creek?
There are at least 30 of these in the water garden (this is the largest so far) and they ate up the hornwort I put in!
Had to resort to putting the hornwort in the bio-filter and in a big mesh laundry bag in the water garden--lovely to behold.
Anyhow, should I cull some of these and 'Freecycle' them?
I'll post a picture of a smaller one with what I know must be a goldfish of some kind.
As always, thanks for your suggestions,
Teresa