Toxic plants:
Black Walnut tree (all parts); Choke Cherry (all parts) serious 'maybe'--koi ate the cherries that dropped in the pond; English Ivy (all parts); Honeysuckle (flowers, leaves) fish ate what dropped into the pond, with a lot of deaths, once removed & a water change, they were okay.
--Koi and goldfish do not hibernate; they go into "torpor" which is a semi-hibernation state for winter. They are quite alert, but their metabolism has slowed down conserving energies.
--Koi are opportunistic feeders, normally at the bottom. Hence, they are omnivores and will survive with whatever they find edible in their environment.
--For an experiment,
set up two Aquaponic systems- stock one with 1" of fish/gallon of water and the other with 1/2" of fish per gallon of water. Observe the difference in plant growth. Use Microbe Life Hydro/Aquaponics in both tanks.
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