I just gave it to dd however we were having it. So either poached, grilled or oven cooked with roast veg. It's breaks into pieces so easily and dd was rather fond of a fistful of salmon from a very young age.
Ours has had salmon a couple of times, but we dont eat it very often as I'm not that keen. Our LO does eat half a mackerel to herself once a week though (now aged 10 mo), and will also eat half a middle sized sea bass to herself. We just give her plain fillet of fish with a bit of black pepper on it - mackerel and sea bass are quite good cos the flakes are large and stay together well enough for her to pick up plus the bones are large and easy to remove. She has had salmon and sea bass in fish cakes, as I always use up any left overs in her lunchbox the next day. I make them with Thai spices, or with finely choppped spring onion, ginger and a little red chilli, which she seems to enjoy. I want to try her with sardines now, as I love them myself, but I'm too scared of her finding tiny fiddly bones still in them - it's so hard to get them all out! she has actually eaten a whole fresh anchovy, bones and all, when 7 months, whilst on holiday in Italy, but only 'cos she swiped the thing from my plate before I could stop her! I was petrified, but apart from a few "this is a lot crunchier than I expected" faces, she managed it fine!