The most common and most likely answer to this crossword clue is the 7 letter word FISHERY
I've seen this crossword clue in The Sunday Telegraph
F
I
S
H
E
R
Y
Buddy explains!

The straight part
We know that "salmon etc, caught here" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case salmon etc, caught here = fishery.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does FISHERY mean?
FISHERY noun- Fishing: the catching, processing and marketing of fish or other seafood.
- A place related to fishing, particularly:
- A right to fish in a particular location; Territorial fishing waters.
- A fishing company.