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rhinogobius rubromaculatus: sexing
September 30, 2012
4:26 am
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mikev
NYC
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Would anyone (Ferrika, please!) explain kindly how to sex them?

I was going to get them today and had to pass because it looked like all of them (20+) in the tank were males.... this of course could not be.

Please help...this is the current dream fish!

September 30, 2012
6:19 am
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Ferrika
Brunswick / Germany
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This is at the R. rubromaculatus sometimes very difficult depending on which variation you have and how well the females are colored.
In the gray variation, it is easiest. The males have a well-marked, white to pink dorsal border. The females have not this and her body is marked with paler red dots.
With the red variation (which you have not, I think) it is very hard. The males and females do not have dorsal border often highly colored fins. Because you can sometimes wait only until courtship to distinguish them :-)
The yellow variation, the same applies as for the red. Males and females can often differ significantly only during courtship. In both variants, the colors are paler in females than in males.

 

R. rubromaculatus grey male

Image Enlarger

 

R. rubromaculatus grey female

Image Enlarger

greets Jutta
September 30, 2012
6:39 am
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mikev
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Jutta,

Thanks a lot. Could you look at this pic plz:

http://www.micropress-inc.com/fishpic/goby1.jpgImage Enlarger

(This is the fish.. .not sure which variation).

September 30, 2012
4:19 pm
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Plaamoo
Bellingham, Washington U.S.A.
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Just buy them all Mike! :)

September 30, 2012
5:15 pm
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mikev
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Quite expensive and having an all male tank does not seem smart either.

September 30, 2012
5:31 pm
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Plaamoo
Bellingham, Washington U.S.A.
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I was joking of course but figured out of 20 there's bound to be a mix.

 

Comparing with Jutta's pics I'm guessing that's a male in the center. See what she says??

September 30, 2012
5:50 pm
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mikev
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nay, I would indeed buy all in some cases. I did just this with sew02/sew04 last time.... the light was bad, figuring out just what the fish was did not seem productive, I took the entire bunch to sort them at home. The vendor keeps them mostly in the dark, so the fish is barely colored, and figuring out there is sometimes quite difficult... we could not even see red dots on rubros!... i don't know how possible it will be to determine who has white fin rim and who has pale! Jutta's photos are great, but I am not sure they will be enough on uncolored fish... maybe she can suggest something else helpful.

I want to know what she says about the one behind! the front fish does look like a male, but they all look like males to me.

September 30, 2012
11:49 pm
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Ferrika
Brunswick / Germany
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Hi Mike,

the fish in the picture is a female :-) There is no white dorsal border.....

The one behind is a female too. Perhaps the fish on the left could be a male (because the white border on the tail fin).

greets Jutta
October 1, 2012
8:49 am
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Matt
Málaga, Spain
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My males all have noticeably wider head profiles than the females too. Is this true in all the colour forms Jutta?

Cake or death?
October 1, 2012
12:11 pm
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Ferrika
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No Matt, only by the grey variation. At the yellow variation there in nothing border and the red variation the border is light blue and there have both sexes this border.

greets Jutta
October 1, 2012
7:19 pm
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mikev
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Thanks a lot Jutta! -- much clearer now. I will try going back armed with your info.

Incidentally, the same seems to apply to Zhoui too... my largest female became nearly as colored as the males, the dorsal rim is the only obvious difference now (when they are not in a spawning mood, of course).

October 1, 2012
8:04 pm
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Plaamoo
Bellingham, Washington U.S.A.
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Ferrika said
Hi Mike,

the fish in the picture is a female :-) There is no white dorsal border.....

The one behind is a female too. Perhaps the fish on the left could be a male (because the white border on the tail fin).

So much for my guessing abilityLaugh. I was going by the spots and assuming that they weren't colored up enough to show the dorsal border. Good luck getting a mix Mike!

October 1, 2012
10:33 pm
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mikev
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Same problem with me, I thought this was an obvious male!

Thanks... not sure yet when I can make it there...will try of course.

October 2, 2012
4:57 am
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Ferrika
Brunswick / Germany
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Matt, I misunderstood your question. Yes, the head is in the gray males are significantly wider than in the females. This is but unfortunately not true for all colors. For the red one sees almost no distinction, the females have a slightly round face. When the yellow that's so the head is barely wider.

Mike and Jim:
The edge of the fin at the gray disappears, as in the zhoui, not even in fright coloration. It can be seen almost always. But the female form of the never. You can see the top of my photo, how wide is this The edge.
With the females you can see it even perhaps suggested but never as wide and clear.

greets Jutta
October 2, 2012
8:21 am
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Matt
Málaga, Spain
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Thanks Jutta. The temperature is dropping here finally so it's time to make an effort to breed mine as well. Moving them to a larger tank this week. :)

Cake or death?
October 8, 2012
7:40 pm
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mikev
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OK.. I got 6 of them.. tried to get 3 pairs, but it looks now like 3m/1f and two questionable.
One problem was that the tanks at the vendors place had very little light so sexing by rims was not possible. (In fact I was not even sure they are rubros the first time I went there: I could not see any red dots on any fish!) I had to rely on the top view and head shape...simply nothing else to go by.

They got much more colorful in my tank and now rims make some sense. I'm pretty positive that 3m are guessed correctly, these guys also get darker when showing off, and at least one shows the interest to the cave as a male should. One female is very likely, the other two may be smaller males, and one of these is not in the best shape (was too dark to see). I'll try to take photos later and post. (I really hate the idea of spending half a day the third time but if I have only one female I probably should.).

Possibly they are not the same locale as Jutta's photos... your male photo has lots of white in the dorsal, but white is diffused... the border of the rim is not sharp. In mine it is.

October 10, 2012
7:03 am
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mikev
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These are the critters:
http://www.micropress-inc.com/fishpic/rm-group.jpgImage Enlarger

October 10, 2012
8:53 am
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Ferrika
Brunswick / Germany
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So you can still see something, Mike.

Bottom left shows a male, right on the disc as well.

Left to the disk and the animal behind it are female, the animal behind the male on the disc is also a woman.

Only the little in the background is not easy to discern.

greets Jutta
October 10, 2012
4:56 pm
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Matt
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Am shifting mine to a bigger tank this week so will try and get some pics to compare.

Cake or death?
October 10, 2012
6:13 pm
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mikev
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Ferrika said

So you can still see something, Mike.

Bottom left shows a male, right on the disc as well.
Left to the disk and the animal behind it are female, the animal behind the male on the disc is also a woman.
Only the little in the background is not easy to discern.

Thank you very much! It is encouraging that you see at least two of each sex!

I could only see them in my tank, in the vendor's tank they were uncolored to the point that no red dots were visible, and I did not take them the first time since both me and the vendor thought they are some other species!

Do you happen to know where one can find photos of other strains (mine are gray, right?)? Very curious how they look like.

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