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Sexual dimorphism in dace?

Started by Guest_pongo_* , Aug 14 2012 11:19 AM

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3 replies to this topic

#1 Guest_pongo_*

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Posted 14 August 2012 - 11:19 AM

I'm sure glad I found this site, info on native fishes is hard to find.

Are blacknosed dace sexual dimorphic? I have what I'm sure are blacknose dace with the red coloration above the lateral line and then others that look very similar in both size and general characteristics but w/o the reddish line. Are these females or perhaps do I have another species perhaps longnose? Here's the best photo's I have been able to snag of those w/o the reddish coloration. I very much appreciate all the assistance. a photo of the reddish line one is posted in my post "how cool is this?"

Thanks!!!

fish 2.jpg 107.28KB 2 downloads

Edited by pongo, 14 August 2012 - 11:20 AM.

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#2 Guest_UncleWillie_*

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Posted 14 August 2012 - 03:45 PM

BND can show sexual dimorphism when in spawning condition. Female are more drab, and plump with eggs, and male can definitely get a broad orange stripe on or above that black band across the body. It's pretty safe to say that the fish you photographed is a male - though it would be easier to tell with no camera flash. I actually think there are some nice male BND photos floating around the forum somewhere..

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#3 Michael Wolfe

Board of Directors

North Georgia, Oconee River Drainage

Posted 14 August 2012 - 03:58 PM

Agree with Uncle WIllie... I used to keep BND when I lived in Ohio... and the males color up with a very nice rusty orange color above the black line and the females do not.

Either write something worth reading or do something worth writing. - Benjamin Franklin

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#4 Guest_exasperatus2002_*

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Posted 15 August 2012 - 07:38 AM

Males will have orange patches on their pectoral fins. Most noticable while in spawning condition or when excited. Mine will do it when I change the tank water if I drop the temp of the fresh water. Females have clear fins.

Male
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