you exercise and are a healthy weght so i say eat what you want. besides good whitefish is low in calories
mike...

Ditto what Mike said. If someone is commenting on how much fish you eat, that’s really their problem. Even it was more like a tub of ice cream- what business do they have telling you? I think that someone who would say this may mean well, but they are being busybodies. You don’t need to be concerned with other people’s opinion!
Besides, given your weight and height, you are tiny, IMHO, and you should eat more. For reference I am about the same height, and I weigh 50 lbs more. I am trying to lose weight. I was 150 when I turned 18, according to my driver license, and I looked like a string bean! If I can get down to 180 - 175, I will transition to maintenance.
If I thought it my business to comment on your diet, I would go into Italian mom mode, encouraging you to eat more, lol.