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but he has succeeded in the end!

What did it swallow (an angel fish?) and what are the sizes of the chaca and the prey?

Viktor Jarikov wrote:What did it swallow (an angel fish?) and what are the sizes of the chaca and the prey?

It caught an adult Ramirezi and is about 8 cm long.

http://en.wikipedia.org/wiki/Ram_cichlid

Interesting. It looks like it swallowed something "triangular". I guess the cichlid could only fit in the stomach half-folded.

Which fish is 8 cm, the cichlid? What is the size of chaca?

Viktor Jarikov wrote: Which fish is 8 cm, the cichlid? What is the size of chaca?

The Chaca chaca is 8 cm and the Mikrogeophagus ramirezi is (was) an adult, lets say about 3-4 cm.