Question

which does not result in an economic impact associated with vessel operation damage?
extensive shoreline property damage caused by excessive boat wakes.
repainting the bottom of the boat due to scraping and sanding of barnacles
the introduction of an aquatic nuisance species (ans), such as the zebra mussel, attached to trailered boats that result in depleted populations of commercially valuable native species.
costly repairs to a boats engine, propeller or hull due to grounding a boat in shallow waters.

Explanation:

The introduction of an aquatic nuisance species is an ecological impact rather than an economic impact directly associated with vessel - operation damage. The other options involve costs related to property damage, boat maintenance, and repairs, which are economic impacts.

Answer:

The introduction of an aquatic nuisance species (ANS), such as the zebra mussel, attached to trailered boats that result in depleted populations of commercially valuable native species.