How will Daphnia help my pond?

[King Edward]

Is the pond permanently green, or is it green at times and clear at other times? If the water only goes green occasionally, this could just be a temporary algal bloom caused by the warmer spring weather and nutrient levels that may have built up over the winter. In which case, it's nothing to worry about and ought to clear before too long. Removing leaves could also cause a temporary bloom by releasing nutrients from the sediment.

If it's permanently green and murky, perhaps an excess of nutrients from whatever soil the plants are in.

Some submerged pondweeds would be a good idea if you haven't any already - might help with the algae and would provide habitat for invertebrates, newts etc. Water starwort (Callitriche) and Curled pondweed (Potamogeton crispus) would be worth trying - just weighed down with stones and they should root into the bottom sediment, so long as you haven't removed all of it.

[Dogghound]

Do you use chemicals around the pond? does anything drain into it? Your suffering from excessive nitrate input so basically the balance which ponds usually reach is failing to occur. How big is the pond? Any trees over it?

[JV]

Originally Posted by Dogghound

Do you use chemicals around the pond? does anything drain into it? Your suffering from excessive nitrate input so basically the balance which ponds usually reach is failing to occur. How big is the pond? Any trees over it?

there is no trees over it and i never use any chemical in my garden and neither do my neighboiurs

[Tursiops2]

Can you post a photo? A picture speaks a thousand words etc.
T2

[Red Robin]

Daphnia introduced themselves last Summer but I didn't have any newts then. Which month do Daphnia (aka Water fleas?) usually appear? No sign of any yet but no mosquito larvae either as it's not warm enough yet.

My small wildlife pond has gravel chippings on the bottom which have become mostly covered in silt. I know that all sorts of small creatures inhabit that layer and I'm not inclined to remove the silt as it's not excessive.