just sent following to contact in WHO:

Especially seeing H5N1 situation in Indonesia, I wonder if “integrated” fish farming plays important role in sustaining H5N1. (Something conservationists have raised, after an email I received re truck load of chicken manure dumped into Vietnamese lake each day, as fish food. FAO seems uninterested in looking into this; they promoted such farming methods, so I’m not sure if that’s reason.)

Not as fish catch the flu; but as dumping manure and carcasses into ponds, having them eaten by fish, maybe get ponds that can be like reservoirs for flu. (And possibility of transfer via farm fish? – in bellies, on skins; with water if fish are transported?)

In this regard, perhaps interesting that Webster et al have reported H5N1 surviving for longer in fairly warm water than regular, wild bird flus.

Here’s a webpage I’ve done after quick trip to Indonesia; on a fish farm, where catfish fed on chicken carcasses etc.
I realise WHO teams in Indonesia extremely busy, but maybe they could do a v little investigating.
(For if fish farms play a role, just slaughtering poultry not adequate for control – especially if proportion of those poultry then used as fish food!)