Life cycle of a water flea

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Dr Mike Oxgreen

Original Poster:

4,202 posts

171 months

Wednesday 11th November 2015
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Whilst doing a bit of experimentation on my nano-tank set-up (experimenting with the filter installation), I retrieved a couple of buckets of rainwater from my water butt and poured it into the tank.

When I switched the light on, I was slightly surprised to see a handful of daphnia-type water fleas moving about in the water.

This has piqued my curiosity: How on earth did they get there?

With mosquito larvae etc, it's pretty obvious: the adults fly in, lay their eggs, and fly away again.

Do daphnia have a flying stage? (I don't think so...)

Do they produce wind-borne eggs that could be washed out of the sky by rain and find their way into my water butt? If so, how do the eggs become wind-borne?

It's not a problem; I'm just very curious to understand how these creatures colonise new habitats. Anyone know the answer?

Mr GrimNasty

8,172 posts

176 months

Wednesday 11th November 2015
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otolith

58,487 posts

210 months

Thursday 12th November 2015
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I once had a load of hydra in a tank after I filled it from the pond.

Dr Mike Oxgreen

Original Poster:

4,202 posts

171 months

Thursday 12th November 2015
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Aha! Brilliant, thanks.

So most likely an egg sac arrived on the roof of my house, by wind or by bird, and was then washed into the water butt by rain.

Nature's amazing, innit?