Yellow Buenos Aires Tetra - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 5 Old 08-07-2009, 11:01 PM Thread Starter
Yellow Buenos Aires Tetra

Hey everyone,

I have a small school of Buenos Aires Tetras in my aquarium, and one of them has all lemon yellow fins... Am I correct in assuming this is a male? This was the first yellow Buenos Aires I'd ever seen, as all the others I've seen seem to have red or only partial yellow fins. Is this common for males? I'd love to get more like him, but I just can't seem to find any others!

Thanks,
Chelsea
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post #2 of 5 Old 08-08-2009, 12:13 PM
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I am not aware of sexual dimorphism in the Buenos Aires Tetra [Hyphessobrycon anisitsi]; as with many of the characins, males are noticeably slimmer than females, and a bit more colourful, but both sexes share the same basic colouration. I understand that there is a variant that has a lemon-yellow caudal fin (tail fin); perhaps one of these is mixed in with your group.

Byron.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 5 Old 08-08-2009, 01:40 PM Thread Starter
Hmm, well all his fins are yellow, not just his caudal fin. And he doesn't have a speck of red anywhere on him... Here's a couple of (very poor quality) pictures of him. I guess my next question would be has anyone else seen a Buenos Aires like this one? What's the deal with them?
Attached Images
File Type: jpg batetra1.jpg (42.6 KB, 33 views)
File Type: jpg batetra2.jpg (28.7 KB, 33 views)
File Type: jpg batetra3.jpg (8.3 KB, 33 views)
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post #4 of 5 Old 08-08-2009, 07:11 PM
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I did a check in Baensch/Riehl and they report that the fins of the male are brighter red or tending towards yellow. My oversight. Just to be certain, I searched a few other references, and all that I checked mention brighter red fins for males, lighter red/pinkish for females, so to answer your initial question the yellow is not solely indicative of a male.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If youíre going to take it under your wing then youíre responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #5 of 5 Old 08-14-2009, 08:03 AM
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They must be doing some selective breeding on these fish....I was in my local fish store last week and they had a tank full of the Yellow Finned Buenos Aries Tetra.........Never seen them before, but i remembered this post and thought i would share...........You probably got a single species that got mixed up.......
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