I use to get them Post Larval PL30 - 45 days old. They would spend the next 3 weeks in large indoor heated aquaculture tanks with lots of netting. I would then transfer to three grow out ponds 20k per pond. Then they spend the next 60 days being fed and growing. I usually sex them at least 4 times during this period.
I only walk the banks at night maybe twice a week, so I have just the limited input. I will say prawns in general are on the dumb side compared to crayfish as defense. Prawns will not spook and shoot away as much as I have noticed walking with crayfish. At night though they seem to change and are very aware of dangers and will use the backward jet takeoff often.
My next question would be why are you looking for the mature ones?
I would like to see some maturity of them at the sportsfishing pond as larger forage and maybe catch a few for myself. Right now, I have a lot of bushy pondweed so lots of cover for them to hid in, so you think that I might see some maturity in them?
