Mystery fish please help!


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Hello I am new here.

Two years ago my daughter rescued some feeder fish and put them in our koi pond. There was a small fry that was still clear in the bag. ( SHOULD HAVE BEEN A GOLDFISH)

Here is what we know:
Has overwintertered 2 ontario winters.
Was skittish last year now more brazen.
Does not school with koi or goldfish
Comes up takes koi pellets goes down and releases them.
Doubled in size over the winter
All our small goldfish are gone
We can not catch it to get a picture
Looks like a sunfish shape but no top fin.
If it was not the fry could a bird have dropped it in? I am afraid it will eat my fish and unsure what to do as we have tried to catch it all of last summer
Petstore told me tropical fish can adapt to winter climate if they are put in as fry???
 
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Welcome!
Tropical fish cannot adapt to our winters.:)
It would be best if you could get an overhead picture of the fish, you don't need to catch the fish for that.
Please tell us about your pond and it would be great if you could include some overall pictures.
 
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Thanks Mitch! That is what I thought about adapting lol

The fish is so dark it doesn't show in a photo. Has a circle mark on each side. Pond is 4 to 5 feet deep 6ft across. We have forest behind us and a large creek.

I will try to get some pictures.
 
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That's a nice looking pond. That's not from this year is it?
(We're under a snowfall warning here...)
It would probably help if you could help some plants get their roots established in the water.
I like the scale pattern of that one koi I see.
 
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Thanks it is the 3rd season. just took the photo 5 minutes ago. We have many plants but they have not come back to life yet :)
 
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I just took the photo a few minutes ago sun is going down. Our plants have not come back to life yet
 

addy1

water gardener / gold fish and shubunkins
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Welcome to our forum! No clue what kind of fish you might have.
 
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I am so intrigued! Maybe on a sunny day you will be able to sneak a picture of it. I'd love to see it!
 
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Jhn

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Could be a species of sunfish like a war mouth but hard to say, with the top down shot. Could also be a largemouth bass. Easiest way to catch and remove it is just go fishing in your pond with a barbless hook.
 
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He looks like some sort of a cichlid, to me! I wonder if he came in on a bird's foot, or if he actually is that teeny little baby fish from the bag of goldfish. I think in pet stores, fry can accidentally move from one tank to another. It is a cool mystery!
 
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Yay I love fishing :) I will keep trying! I thought he looked like a cichlid too but I do not think a cichlid would survice canadian winter would it?
20190428_104850.jpg
 
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I saw the blue gill spot too! I know that bass and other fish like that are cichlids and they are found in lakes in North America. So maybe it is a sturdy northern type of cichlid.
 
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Whatever it is, it needs to go. Could be any of the eating machines in the sunfish family including small mouth and large mouth bass.
 
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