Spring breeding season?

I have a theory that they breed March to April and then September to October time frame.

My female hystrix breed the first time in March (early spring) of 2012. The next time was in May (late spring) of 2013. Will be interesting to see if there is any action in the coming months. Still in the depths of winter right now...

Fishdog- what is your theory based on? I have never bred rays as of yet, just waiting for them to mature so I am very interested in all thoughts on this. If we are controling all outside influences, water temp, diet, water parameters, light conditions, etc, shouldnt they breed evenly thoughout the year?

No science here just what I have seen from my tanks that stay pretty consistent throughout the year. I do not mess with pH, temp, feeding, or whatever else. The only thing that changes is external weather which I assume changes pressures in the tank. My months might be off by one but all my 10 litters were conceived in the months listed and it seems like 3-4 months after those months they collect a lot of pups in the wild. So one can only assume there are two times of the year that breeding potential is high.

Noticed last night that the female had a fresh bite on the edge of her disc, and it looks like the male was biting the edge of her spiracle just below her left eye.

My male marble has been trying to mate with one of my females for the last couple of weeks and since the jag has dropped her pups the male is back on her again as well.