Managing you sugar is a complex battle, moving away from processed foods that are high in carbohydrates, salt and fat should be your prime direction.

Fish can be a healthy source of protein when consumed in good measure. We need to be aware that large fish can store significant amounts of toxic heavy metals in their flesh. Refer to EPA advisory https://www.epa.gov/fish-tech/2017-epa-fda-advice-about-eating-fish-and-shellfish
The important feature of the diet is balance with protein (fish) in proportion to other foods.
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A pescatarian diet is okay. It is a diet high in legumes, fish, seafood, etc. It is basically vegetarian with added fish and seafood. You can also add dairy. I don't like fish, so I wouldn't use it, but it would work okay with your diabetes. Enjoy some crab and lobster for me!!