[ThRoewer]

I don't think that responsibly collecting (= no cyanide and only taking smaller specimen while leaving the adult breeders behind) for the aquarium trade is generally to blame for declining numbers of fish.
These days the preferred specimen are smaller juveniles or subadults anyway and not the larger breeding individuals that were often collected in the past. Most Fish you find these days in stores are not much older than a year and if there is any impact of removing them from the wild it is more towards predators feeding on them then the collected species.
Unfortunately, the larger specimen are these days more and more targeted for human consumption.

Power boats, jet-skis and tourism in general do more harm.

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