I have 10 aquaculture tubs around 1/2 meter square each (any bigger the dog climbs into them). Finding suitable productive aquatic plants has been easy, but I thought it would be nice to raise some productive edible creatures in them too, everything I've read says the tubs are too small to produce any respectable quantities of meat, I thought sounds like a job for permaculture. For a while I thought I'd read somewhere mosquito larvae are scooped up, cooked and eaten in Borneo or somewhere, but must have dreamt that. I'm going to investigate the New Zealand freshwater prawn, they seem wildly prolific, and are apparently raised in pots by fishermen etc. The fact that there is no record of humans eating them is a bit of a stumbling block, although all crustacians are thought to be non-toxic, disease may be the problem, they eat rotting fish. I'm in New Zealand but I imagine anything that exists in hotter climates probably has a smaller cousin here. Any ideas, conventional or unconventional, much appreciated.