A male of my Sicyopterus sp seems to have been in heat, and a color of the body changed loudly and has begun to chase around a female.
It was sold as an imported Sicyopterus goby by Indonesia.
There is a case sold as "mountain rock goby".
The video clip is uploaded in Youtube, too.
http://www.youtube.com/watch?v=xQynXiVOCOU
The detailed past post about these gobies is this place.
http://forums.loaches.com/viewtopic.php ... c&start=45
Male
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus01.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus02.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus03.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus04.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus05.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus06.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus07.jpg)
Female?
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus08.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus09.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus10.jpg)
![Image](http://tanzawa-sky-club.air-nifty.com/photos/uncategorized/2009/09/19/sicyopterus11.jpg)