David writes; I had this Email sent to me by a French lake owner today… I thought I’d pass it on so other lake owners could either benefit or comment;
‘I recently had a meeting with a recognised fishery expert and we had a very interesting conversation about the use of lime.
It is already widely known that lime kills undesirable water-borne creatures and I’ve been adding lime each winter to achieve this. However, having fully discussed this with the vet, it is more specific that just spreading dry (granulated) lime over the surface of a lake.
I’ve been told that it’s necessary to make up a “lime milk”. This is done by mixing the granulated lime 1 part to 3 parts water. This makes a “lime milk” which should then be added to the lake (by means of some type of Heath Robinson system – pump etc) and spread throughout. This turns the water a milky colour, which will disperse. The timing is also important – this should be done in February (the guy said before March) but I’m assuming that the hatching of creatures is dependant on whether one has a warm or cold spring.
The difference between just adding the dry lime and the milk solution is that the dry lime simply drops to the bottom and only kills the larvae there, whereas the milk solution also kills the suspended larvae that are waiting to hatch. The dosage rate is 150kg of lime to 1 hectare.
I thought perhaps you may find this information useful.’
(Definitely worth reading the comments below before you come to any conclusions on this one)