At what size can you sex these guys , my largest one i thought was a male but it has dug a pit and chases everyone away except my male mextico blue so my guess is female unless two males can pair up.
islantum behavior
- Thread starter cornbread_5
- Start date
Both male and female istlanum can be very aggressive and territorial. The red female shown in the profile was mistaken for a male by me because it was the largest, most aggressive of the group I had purchased. She was eventually sold to someone as a female and she laid eggs. The male killed her and the spawn shortly after, as usual.
http://www.monsterfishkeepers.com/forums/showthread.php?t=160496
I'd say females will show more red in the flanks. The male I have now never showed any red but the females in his batch did show some red. Males begin to develop a bit of a nuchal hump early too. Istlanum also tend to have their tubes out a good bit too which can help sex them.
http://www.monsterfishkeepers.com/forums/showthread.php?t=160496
I'd say females will show more red in the flanks. The male I have now never showed any red but the females in his batch did show some red. Males begin to develop a bit of a nuchal hump early too. Istlanum also tend to have their tubes out a good bit too which can help sex them.