Unfortunately, we have not been able to reproduce this on our test devices, and the issue may be caused by a low memory condition. Some customers have reported overcoming this problem by reducing the number of fish in their selling tank to less than 15. Also, many customers have been able to resolve this problem by freeing up memory on their device.

I did see that you cleared your cache, but have you freed up the memory on your device? (I'm enclosing some information below on this)

You can prevent many crashes by making sure that you close any apps that you aren't actually using before playing the game. With multi-tasking operating systems like Android OS, tapping the home function does not completely close an app and free the memory that it was using. Tapping Home places the app in the background, where it can still consume system resources. Whenever you want to make sure that sufficient memory is available for running apps, you should use the application management function in your device's Settings panel to close any apps you don't need running. This will make more memory available to run the game. If you're not sure how to close running apps, let me know.