Question

white perch is a fish that is native to atlantic coastal regions and is invasive to the great lakes. it feeds on native species and is thought to be the cause of the decline of the great lakes walleye fish populations. what was most likely its mode of introduction?
produce brought from the eastern states
trapped in a ships ballast or a water tank
trapped in a cargo crate carrying nonperishable items
luggage brought in an overseas flight

Explanation:

Invasive species often get introduced through human - related activities. Ships' ballast or water tanks are common vectors for aquatic species introduction. Produce (non - aquatic environment), cargo crates (non - aquatic), and overseas flight luggage (unlikely for fish survival and release into Great Lakes aquatic system) are less likely.

Answer:

trapped in a ship's ballast or a water tank