Many adults don't like fish much and don't eat it. Omega-3 benefits are real and substantial — and most easily obtained from oily fish. Learning to enjoy 2-3 specific fish dishes is worth the effort.
How to start liking fish
Start with mild fish (cod, hake) before strong-flavoured (mackerel, sardines). Quality matters — fresh good fish is better than poor quality. Specific preparations (fish pies, fish curries) hide stronger flavours. Sushi-grade salmon for those who like raw.
Where alternatives work
Algae-based omega-3 supplements for committed non-fish-eaters. Less effective than whole fish but still provides EPA and DHA. Flax seeds and walnuts provide ALA but body converts poorly to EPA/DHA.
Most adults can find 2-3 fish preparations they actually enjoy with experimentation. Worth the effort for omega-3 benefits.