These are the two kind of fish bones used for fish broth.

Red Snapper fish bones

Garoupa fish bones

The end results is this collagenous fish broth which can be frozen if not used immediately.

How do you prepare this yummilicious broth.

Check out this link for the details.

https://flofoodventure.wordpress.com/2014/06/21/what-do-you-do-with-fish-bones-fish-stock/