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Fish
Leon,
I've kept fish for many years, not in a pond but in aquaria. Typically my very ordinary goldfish will live a decade or more, longevity is a great indicator of health.
The key..... water circulation, circulate the water as much as possible, a big submersible pump can be had for next to nothing on ebay. Pump as much air as you can into the water.
To control the build up of nitrates, draw water from the bottom of the pond and give the nitrogen rich water to your plants, they'll love you for it.
If your keeping carp a solid water change every week, they're such grubby fish closed systems like ponds require active management.
Ps: my last goldfish died in June of this year, the age estimate 15 years. I'm not keeping goldfish anymore i was quite attached to the fish.
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