This is mainly to do with what to do to not kill most of the tadpoles...but also dragonfly & beetle larvae.
Loads of frogspawn is laid every year in my koi pond settlement/filter add-on 'bay',
I'm already overfull & there's probably more on the way.
Seems there's less & less 'urban' ponds, natural or otherwise around (at least around here) these days,
I think possibly those that do exist may be getting an ever increasing 'amphibian catchment'.
This bay (6ftx10ft by 1.5ft deep) has a 100W pump running in it, & so far this year the pump has killed two frogs already,
they get pulled into/onto the pump's 'wildlife friendly' casing & die,
probably quite nastily - like guts sucked out, legs chopped off etc.
A large proportion of the tadpoles seem to get 'pumped' each year,
but many survive that, & another proportion of those will get eaten by the fish
- although the fact that I get a lot of frogspawn every year presumably means enough survive.
If I was to take extreme measures e.g. huge fine net protection filter for the pump (actually thinking of using a fishing keep-net),
I reckon I could stop the carnage, but wondering if it's the right thing to do, or rather what should I do...
If I'm effectively breeding (i.e. selecting-for) those tadpoles that have certain characteristics
- like not swimming very far from the place they were hatched,
then I might be introducing a 'false' unatural dynamic in the local frog population - is this bad ?
And if I did 'save' them all, I'd have far too many to be supported by the food availability, = possibly stunted growth, or weak frog poulation ?
So I'd need to offload much of the spawn/tadpoles
- but where to ... maybe the local 'village pond', is this legal ?, and anyway there's fish in there as well.
Torn between just letting it all happen, or getting proactive about it,
any suggestions ?