Need advice on how to preserve fish

[summers in kuwait]

This is a helpful thread considering a lot of time and effort can go into catching fish and the last thing you want is to waste any usable resource.

What are some thoughts about cleaning the fish and prepping before freezing, etc.

For example I usually bleed and gut on the water, but Ive heard some say not to rinse with fresh water. Does this have an ill effect on the taste of the fish or preserving the fish?

What are others doing once they catch the fish, till storing their catch in the freezer and is there different approaches for different species. For example - Sashimi Grade Tuna

Thanks for the info!