I think it kinda depends on what your mindset is. When I'm chasing schoolies with light tackle, or throwing plastic into the rocks, a teen fish is pretty big.
If I'm livelining bait or tossing eels at night, I have different expectations and I think fish over 20lbs are pretty big.
But my scale goes like:
keeper size = decent fish
teens-20lb = nice fish
20lb-25lb = good fish
25-35lb = big fish
35-50lb = huge fish
50lb - up = MONSTER fish
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