Moroccan-style gefilte fish

Thanks for this recipe - it looks wonderful! A couple of things: the video featured uses a "squash" that's not listed in the written form of the recipe (is that zucchini?). Additionally, some of the measurements (specifically the water and wine) differ as well. But my main question is: can you use this recipe with other kinds of fish, specifically Nile Perch (yes, I live in Israel) fillets? Thanks!