How are volcanic lakes formed and how do they have fish inside of them?

Question

I've always wondered how water gets filled into a lake formed by a volcano and where the fish in those water comes from?

Answer 1

Rain water and such fill up these.
Birds as usual drops fish these fish have eggs--eggs hatch--
Also birds don't always digest or eat all meals of fish and many fish eggs are dropped into these waters to hatch.

many local ponds get fish in the same manner.

Answer 2

Rain water and run-off will fill the "lake" and it's possible it can be fed from a stream. If it is an isolated lake, the only way fish get into them is if they are put there. If there is near by water....like other lakes....streams...ect. Flooding in that area can trap fish in the lake. Unless....you want to think, it took millions of years and they just happened to have evolved there......I don't think so.

Answer 3

Rain fall and run off fill the lakes with water. I've heard and it make sense to me that wadding birds, cranes etc. are the primary transporters of fish eggs. The birds wade through fish eggs at one location fly to another and some of the eggs wash off the feet of the birds into the new lake.

I dont know how accurate that is but it makes sense.

Answer 4

volcanic lakes form by earthquake, fish inside because it love the boil of volcano.

Answer 5

i think that water and fish get in there from waves