On 6 May 2021 11:15:17 GMT, David wrote:

On Wed, 05 May 2021 20:37:36 +0100, Martin Brown wrote:

On 05/05/2021 19:30, David wrote:
The tadpoles hatched from the frog spawn and looked pretty lively.

They were decanted into a plastic tub full of rain water which was
buried in the ground to form a mini pond.
Some bricks were added to provide a platform for mature froglets to use
to escape.
Plenty of pond weed for food.

Move on several weeks and it is hard to find any tadpoles, and those
located are still tiny and are not moving.

They are carnivorous and if there is nothing else to eat will eat each
other. Try ants eggs, live water fleas or fish food flakes to fatten
them up. It is so cold right now that I expect they are almost in
stasis. We had snow on the ground this afternoon and on Saturday.

I don't expect this year to be any good for plums, pears or cherries -
they have all taken a battering in the past couple of day. Hardly any
flying insects either. Swallows and house martins were wise to be late.

Internet searches suggest that one reason could be very cold water.
It has been very cold this last month with air frosts nearly every
night and it was a very chilly April, and May isn't looking much better
given the sleet and hail.

Has anyone else had problems with tadpoles growing?

Water seems fresh, there is algae and water weed for food.

I think they want a bit more than rabbit food.

If not the cold (and the water was screened for predators and a Mayfly
larva evicted to another tub) are there any suggestions as to likely
cause?

My guess is shortage of food leading to cannibalism.

Received wisdom is that tadpoles start out vegetarian and live on algae
and other plants.

Later on in their development (around when the develop front legs) they
become carnivores and we have some late stage tadpole food for when (if)
that happens.

One reason we were checking the tadpoles was to see how far along they
were with their development.

Answer was - not very far along at all.

I'm assuming that if they had turned carnivore there would be a small
number of large tadpoles looking suspiciously well fed.



I'm not an expert but have adjoining rockery ponds, about 3' above
ground in this property that we moved into 5yrs ago. Last year there
were no tadpoles and the water wasn't nice so totally emptied, cleaned
and refilled (water butt rainwater, water butts also cleaned) and we
had 4 lots of spawn in March. Now have both ponds brimming with
tadpoles some bigger than others quite happily going along the edges
of the ponds eating the algae. Not added any food.

My understanding also is as they turn into froglets they get teeth and
become carniverous and hopefully will start devouring the daphnia that
are forming in the pond.

Apart from cleaning the ponds I'm hoping to leave nature to nature.

In the East Midlands and there's been thin ice during the growth
period but otherwise a sheltered spot.

Not sure if this is of any benefit to the OP other than the tadpoles
seem ok here.


--
AnthonyL

Why ever wait to finish a job before starting the next?