Adler, Paul [PAdler@afrs.ars.usda.gov] wrote:
>We have completed an economic analysis of our system and nutrient
>costs are about 0.5% of the combined operating costs. Labor,
>energy, a manager, and packaging materials account for about 75% of the
>combined operating costs and another 20+% in fish feed, seed costs,
>overhead, and maintenance.

thank you for sharing this information. Your low nutrient costs is highly
significant and strongly supports the IBS approach that a wastes which
otherwise would incur costs for treatment or disposal can become a resource
in savings for another sub-system.

>> what do you do with the filtered material, is there any use for this
>> material ?
>
>Regarding the solid organic material, we are working on a type of
>composting system.

rainbow trout can be fed with fresh earthworms or other types of worms. May
I suggest that you consider growing worms using the filtered solid organic
material from the fish tanks. Plant wastes can also be added to the
earthworm culture.

Q: how much of this organic waste matter can you get per day ?

regards
jacky