和老同学们一起钓鱼用英文表达，可以很地道自然地用以下几种方式：
- “I had a great time fishing with my old classmates.”
- “We went fishing with some old school friends.”
- “It was so much fun catching fish with my high school buddies.”
- “I spent a lovely day fishing with my college mates.”
- “We had a blast fishing with our old classmates from uni.”
- “I joined my former classmates for a fishing trip.”
- “It was a real treat to fish with my old classmates again.”
这些表达方式都很适合日常交流分享，可以根据具体情境和关系亲密度选择最合适的一种。