Backyard Aquaponics
A place to discuss aquaponics

Thanks Gav... filed in the memory banks in case of a similar situation...

Might it simply be the change they object to? Would they have jumped if you moved them from recirc to flow-through? Just a thought...

[quote="hydrophilia"]Might it simply be the change they object to? Would they have jumped if you moved them from recirc to flow-through? Just a thought...

From my experience trout do better in flow thru than the re-circ systems, its easier to keep them at higher stocking densities without having to worry about water quality and the growth rates are better. With no pumping costs it is also more economical which is why pretty much all trout farms use flow thru.
I have moved fish from re-circ tanks into flow thru systems but make sure the netting stays over the tanks so havent had any more jumping disasters.

How are solids removed from a (relatively small) flow thru system? sorry for the change of topic/hyjack

In one of my systems I remove the majority of the solids thru a swirl filter which is reguarly drained onto grassland. The rest of the water flows thru a series of small ponds containing aquatic plants before going into a dam. With my other systems all the water exiting the tanks goes directly to a swampy area on the property full of rushes/reeds before filtering thru and then out into the creek.
These days you have to have some sort of settling pond (or a series of them) on the property to remove the wastes before any water can leave the property. In the past this never happened and the nutrient rich water was just returned to the creek to become someone elses problem downstream. The Salmon Ponds in Plenty (Tasmania) still operates this way though their stocking densities are not that high these days as its mainly there for a tourist attraction not the new hatchery in New Norfolk is in operation.