When I'm reading and I come across a word I don't know. I have the habit of reading it with the English word "something".
For example, if I didn't know 魚 and I read 猫は魚が食べる, I'd read it in my mind:
"neko wa something ga taberu".
That's not good since "something" is a very un Japanese word, so what is a better way to read such things when you don't know how to read them?