Ah, has it been so long? Sorry.
To bring you up to speed – I had a disaster around ANZAC day this year (6 months ago, I know) and I lost a bunch of fish. The weird thing is that I lost a bunch of fish at exactly the same time of year last year. So could be something seasonal? I think it’s more likely that I overstocked, and fell into the ol’ trap of “I want ’em to grow big so I’ll feed ’em heaps’ and of course overfed them which is the worst thing you can do in AP. I think what ended up doing the fish in, was that the fish food broke down into a fine paste kind of stuff and spread throughout the system. And then as it breaks down it consumes oxygen, and trout are VERY touchy about DO (Dissolved Oxygen). But that’s the thing with fish deaths – they don’t really tell you why they died.
It’s not all bad news! I have about 60 trout, and whats more, they survived an entire month without me. I was overseas (check out these videos of the norwegian fjords: Kayaking and the “liquid metal” water ), my father and a friend looked after the system – this entailed coming over on alternating days, and feeding the fish. Not too onerous.
So my fish survived, and here they are – about 1.5 months ago they looked like this:
So they’ve definitely grown. And it’s fantastic fun feeding them:
Above is some brightly coloured silvebeet, and below is russian red kale.
So why did I say things are going OK rather than fantastic? Well one of my growbeds has a big bare patch where I sprinkled in some seeds, and that’s a bit dissapointing. But I know why that’s happened. I have a slater problem, and the little bastards are eating everything, seeds, seedlings, my leek:
So what am I doing? “Flood ’em out”.
I raise the height of the standpipe so that the bed floods to above the height of the clay, and drown critters.
Edit: I should also mention that there is an Aquaponics open day at Alfred Deakin high on 9/10/10 – see capitalaquaponics for more details.