I'm sure everyone has there own fishcake recipe, but I tried this one yesterday and it worked out pretty good.
http://www.jamieoliver.com/us/foundation/jamies-food-revolution/recipes/SALMON_FISH_CAKESI tried to use a lot more fish than potato, last time I did the reverse and it was still good but too mushy. I also used coarse pepper and a little Mrs. Dash. When the recipe says "zest" a lemon, basically that means running a lemon skin over a cheese grater and stopping when you see white.
After patties were made, I left in fridge for a while to firm up (uncovered): 3-4 hours. Best to form patties when mashed potatoes are cold as recipe suggests. And I used a lot of olive oil to fry, but at relatively low heat. 5 or 6 to get oil hot and then 4 once frying, turning often so as not to burn. I also put a little coarse pepper and sea salt in the oil before I threw in the patties.
Pretty basic. I think you could throw whatever you wanted in, like bell peppers, onions, your choice of spices etc. Fresh parsley is way better than using dried. I find the thinner the cakes/patties the better.
Fresh lemon squeezed over, goes good with asparagus and 2 minute chow mein fried in the same pan with some alfredo sauce or just more olive oil and salt.
Edit: My buddy showed me this way to make pasta, and it is excellent. Sea salt and water to boil, throw in pasta. Once done... this is important... keep a shot glass of the pasta water before draining. Using same pot, lots of olive oil, bit of sea salt and lots of garlic.. throw pasta back in and add shot glass of pasta water you saved. Stir for couple minutes, scrape the bottom of pan and serve.