While you might think it does not matter, there is a very important battle in the seafood industry. Yes, the brands you buy and choose to get your seafood from are very important. If you want to know more about this, follow the Marine Stewardship Council.
They are great for informing you about sea life policy and how we, as a species, tend to have a negative impact due to overfishing. They have a great sustainable seafood guideline that I recommend you check out. You will feel much more educated about seafood, and you can then pass these details on to other people in your life.
For me, this was eye-opening, and it made me change quite drastically how I buy my seafood. If you care about sustainability, the MSC can make it easier to grasp these important topics.