My friend has just put some very large koi carp in her pond about 2 weeks ago ,?

okayalder62 asked: there is a waterfall and fountain but no air filtration system what so ever shes gone on holiday and ive got up this morning and 3 of the fish are dead,she also has gold fish,its obvious from looking that the pond is not large enough but i want to know is there [...]

I keep 2 koi carp, and have noticed a black sort of jelly forming in the pool of the waterfall, is this BAD?

blundetr asked: The fish appear to be quite happy, and the water is clear,blanket weed under control, there are also 3 gold fish in the pond, I hope it is,nt serious, as my koi are over 10 years old and about 14 inches long.

What does it mean when some of my Koi carp start jumping out of the water?

trev1690gers asked:

I don’t think it’s lack of Oxygen as I have a pump connected to a waterfall, plus plenty of Oxygenating plants. Any ideas?

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