Great sentence — it is grammatically correct!
Your sentence: Fishing boats drag big nets through the water and scoop up lots of fish.
Why it's correct:
- Subject: "Fishing boats" (who is doing the action).
- Verbs: "drag" and "scoop" (both are in the present tense and match the plural subject "boats").
- Objects: "big nets" (what is dragged) and "lots of fish" (what is scooped).
- The two actions are joined with "and", so the sentence reads smoothly.
Small tips and easy alternatives:
- For speaking or casual writing, "lots of fish" is fine.
- More formal: "Fishing boats pull large nets through the water and catch many fish."
- Simpler for young readers: "Fishing boats pull nets through the water and catch lots of fish."
Nice work — your sentence is correct. Keep practicing writing!