Greenhouse Living Contents (con't)
Over the years, the two tanks in the greenhouse have contained decorative carp and such edible fish as catfish and bluegills, plus occasional turtles, frogs, freshwater clams, and crayfish. Floating in each pond is a "raft" whose suspended fishnet encloses a space safe for young fish and other small animals to grow in. Although water hyacinths and duckweed, and bacteria living on plastic substrates placed in the tanks, strip out most of the nitrogen and other fish wastes, residual nutrients can also be recovered by using the fishwater for hand watering by can, hose, or drip irrigation. Currently, every other watering uses tankwater.
Next: Conclusion
