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Identify black eyed Metynnis (silver dollar)
March 5, 2014
6:13 pm
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mr257
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Sorry for my english. Im a Norwegian that have given up asking other Norwegians about this topic.

Can someone help me with what I belive is a spotted silver dollar. I have a group of 15 in total.
Those in silver i belive is Maculatus or Lippincottianus, but i can't find any pictures or information on those 6 that stick out with a stronger red colour and totally black eyes.
Is this another sp. or is it just the location of capture that are different?
I've got them shipped from Colombia all together.

Got a tips on Myloplus Rubripinnis, but can not find black eyes on them when i try to google it.

Would love to find out more information on them.

 

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March 6, 2014
1:33 pm
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coelacanth
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Are you absolutely sure of their origin? A local retailer had some very similar to these from the Far East, it was widely assumed that they were a cultivar.

March 6, 2014
5:35 pm
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shorty
Bergen, Norway
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They look to me to have the same type of colour mutation as "blushing" angelfish, so the red you see is actually blood, gills, flesh etc and the eyes are black because the silver is also missing in the iris. We get the same thing with salmon at the aquaculture  facility I work at, only the fish look grey cause they only seen to loose the silver layer.

March 7, 2014
2:16 pm
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mr257
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They were sent via a wholesaler, so it is his words about the shipping. So I can't say for sure.

There is no information to find, so cultivated could be the answer.

When i google Spotted Silver Dollar Black eyed, an old forumthread show the same eyes in a video. But gives no answers.
 http://www.aussiepyt...-please-184502/

 

I also sent an email to a website that sell one that look simular.

 They call it Metynnis sp. Black Eye.
http://pieraquatics....?id_product=424

They have not answered.

Is that colour mutation a result from cultivation shorty?

 

March 7, 2014
2:40 pm
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shorty
Bergen, Norway
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As with many colour mutations they are often disadvantageous, so it is doubtful any numbers of said fish would be found from the wild. So yes I would guess it would be the result of cultivation, whether it was intentional (line bred/selective breeding) I couldn't say.

 

At my aquaculture facility we see all sorts of colour mutations as well as physical appearance mutations (goldfish bodied salmon, double tails, etc) . Generally wouldn't see these in the wild because they are weaker fish and there might be a higher consequence of them due to parent relatedness, some type of environmental shock during fertilization, egg development etc.

March 7, 2014
3:58 pm
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mr257
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Thanks Shorty.

That make sense.

Think I have to call the salesman and let him know that he owes me a really good deal on future trading.

March 7, 2014
6:07 pm
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shorty
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I personally would think so.....

March 10, 2014
6:07 pm
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mr257
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March 10, 2014
7:13 pm
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coelacanth
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They do look like the ones at Pier Aquatics (although the exact species involved may be different), but you wouldn't get an answer at the moment as they are very busy preparing for the Catfish Convention this weekend, however this is the retailer I was referring to in my original reply.

Pete

March 10, 2014
7:30 pm
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mr257
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Thanks Pete. 
I hope they'll have an answer to the topic when they have time.
It is fun to investigate and this has been a hard one.
They do look nice and colour up the tank togheter with my Maculatus, but I think I will seperate them in the future to avoid (if possible) crossing.
Don't even know if I'll get them to spawning, but anyway.

March 19, 2014
2:04 pm
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coelacanth
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I had a look at the ones at Pier over the weekend and they are the same fish to all intents and purposes, and they were definitely a Far East import, not a natural fish.

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