The outdoor ponds

The outdoor ponds have been set up, and the koi, pond fish and turtles moved out. We’re expecting a small order of new koi – kohaku and sanke – this afternoon. Plants will be coming in a week or so – water lettuce and water hyacinth, and probably lilies as well.

Plants serve many functions in a pond. Some, like hornwort, are active oxygenators. Surface plants such as water lilies and water lettuce cast shade and provide shelter and hiding places for fish. Fish who have somewhere to hide are more likely to come out. They feel secure knowing they can hide when they’re threatened.

Plants also cut algae growth two ways. They reduce light, and they take up nutrition. Algicides are illegal in Canada, so any help you can get to keep algae down in your pond is good.

The showpiece of the outdoor section is the big pool, 1400 gallons. Currently the large koi from inside the store, as well as a large ID shark and our own Dr Wellfish, the tiger shovelnose catfish, have been moved outside. Fish do better in sunshine, and koi with hi (pronounced “hee” – the red colour) become very much brighter with exposure to sunlight. Algae helps their colour, too.

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