Tattoo Design

Hi, I'm looking for a tattoo design that would sit on the inside of my forearm. I'm an expat Scot living in Canada with a Japanese wife and I was looking for something that would bring those key things together. I have been thinking of a design around Yin and Yang with fish (Salmon and Koi) as the theme. Both my wife and I liked to fly fish. I'm thinking of something in black and grey as I don't know if there is enough color to pull from an image of a Salmon. I'm not stuck on the Yin/Yang motif so if you can think of something cooler then I'm open to suggestions. Ideally the tattoo design would be around 4inch however I have a little latitude here. Can you also provide an option that might incorporate some type of background to tie the two fish together. Sorry if this is long winded I haven't done a tattoo before and don't know what info is generally required. I have attached a few small images with line drawings of fish that are more in line with my taste. I would be looking for 2-3 options if you can provide them in this price range.