How many fish live in the river themes?

It's impossible to say how many fish live in "the river themes" without more context.

Here's why:

* "The river themes" isn't a specific river. There are thousands of rivers in the world, each with different fish populations.

* Fish populations fluctuate constantly. Factors like weather, food availability, pollution, and fishing pressure all impact how many fish live in a river.

To get an answer, you'd need to specify which river you're asking about.

Let me know if you have a specific river in mind!