Male's Behaviors in Spawning Season
Doing Serious Fight With Another Male
I saw such a fight once, then I worried that if the two males would being together as they are, they would doing fight to death, so I moved the one male and two bride candidates to the other tank. Because of this, I'm not sure whether they do fights to death or not if they were in a same tank for a long period in a spawning season. But I can say it should be considered that separating males in the season. The fight is as follows:
Two males started pecking each other (that is a little fight as usual). A few second later, they two males transformed flatly as if his body was pressed from the side. (this photo had been taken when he started such a transformation and would fight with the other one on the other side of the partition. this was taken at another day.) They ran on the same circle about five rounds. Then they clashed. One bit left side of belly of the other very hard and they gone down behind a mass of willow moss. A few seconds later, they got out of the moss and gone away. After that, I looked at left side of belly of one was bitten, there is something like a wound or wrinkle.