Best place to buy fresh and good tasting/healthy fish?

Make them yourself. Real easy. With none of the extra added shite.

A lot of half truths and misunderstandings being posted here.

1. You need an angling licence depending on what species you intend to target. Salmon and sea trout require licenses and local waters will have some restrictions also. Typically you do not need a license for sea angling but there is a closed season on bass, there are some species which you cannot keep (e.g. angel shark, white and flapper skate) and there are some species which you cannot even target without authorised skippers e.g. bluefin tuna.
2. Trawling does indeed cause disturbance on the seabed but the extent of it depends on the nature of the ground being trawled. Fish caught over rough bottoms (such as monkfish) are fished for using larger bobbins on the net foot rope which allow the net to skip over the bottom easier. Dredging for scallops is probably the most impactful method of fishing, short of dynamite and cyanide on a reef. The most efficient and "environmentally friendly" methods of commercial capture of fish/shellfish are pots, pelagic trawls (not without its issues mind you) but what you should be looking for is fish caught using a Danish/Scottish seine. This method eliminates trawl doors, reduces fuel consumption on the boat and results in much better quality catch and reduced bycatch. Some trawlers also employ the use of specially designed nets employing escape panels or Swedish grids to reduce bycatch but as far as I am aware, there is no way of knowing this based on the packaging (this is an issue which should be addressed as you could attach a premium to fish caught using these methods which would encourage others to follow suit).
3. Sea bass, bream and 99% of salmon sold here is farmed, typically outside the country. This is due to the fishes biology, national measures in place to protect the stocks (bass and salmon) and low native stock levels.
4. Wild fish are indeed caught and used in feed for farmed fish. However, the conversion factor is much, much better these days. It used to be 1 to 2kg of wild fish required to grow 1kg of farmed but that is now under a ratio of 1:1 as the science has got better and alternative like soy are used to bulk out the feed.
5. Like it or not, farmed fish are here to stay with global demand constantly rising.
6. "Fresh" fish may have been sitting on ice for up to 10 to 14 days before you buy it from your local fish monger.
7. The laws on packaging here need to be revisited - much of the hake sold in Lidl/Aldi is sourced in South Africa but is packaged in Ireland so can therefore be packaged with the label "Produced in Ireland" on it. People see this and assume it is Irish fish when it's really from the other side of the world.

Your best fish is going to be local but make sure you ask the questions. The best stuff is expensive but worth it.

Alaskan Pollock seems to be caught at sea, not farmed, and is commonly used in (frozen) fish fingers. Check out Dunnes own brand ones, a fraction of price of branded ones like Birdseye.

Lol 0 out of 4 guesses!

Lots of wannabe influencers seem to enjoy having a go at Rapeseed oil. I think they're copying each other, you see them walking isles of supermarkets on sociaks. There are some excellent Irish rapeseed oils out there which I'd rather use than EV olive oil.