Sorry for my late reply ! I left outside and I did not check my post in Steemit for a long time...

Yes @englishtchrivy you are correct it is herring. But I must add that this is specific to my family recipe and that there are different types of fishes that can be put in the recipe.
We popular call it (for this recipe) pan fish because it is smal and easy to handle .
Pan fish can be herring (like here) and even anchovy.