Trout amandine is a French classic that is usually swimming in butter. This version uses a little butter only to toast the almonds, which is where the flavour comes from. Dry the skin well and leave the fish alone in the pan, and the skin will crisp without sticking.

Trout counts as an oily fish, alongside salmon, mackerel and sardines. UK advice is to eat at least two portions of fish a week, one of them oily, and a portion is about 140g, exactly what each fillet weighs here. Most rainbow trout sold in the UK is farmed in freshwater.
Oily fish is one of the few natural food sources of vitamin D, alongside eggs and red meat. It is still hard to get enough from food alone in autumn and winter, which is why the NHS suggests everyone in the UK consider a daily 10 microgram supplement in those months. How vitamin D relates to hormones is covered in does vitamin D raise testosterone?
A serving has about 36g of protein and around 500 calories with the potatoes. The almonds bring vitamin E, magnesium and some extra protein, and the fat they add is mostly the unsaturated kind.
For women around menopause, protein and oily fish both matter for keeping muscle and bone: see bone health after menopause. If you are pregnant or planning a pregnancy, the advice is to have no more than two portions of oily fish a week.
For another oily fish dinner, try the salmon traybake with new potatoes and broccoli, or smoked mackerel kedgeree.