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?
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Answer: The answer is B.
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The most likely mode is trapped in a ship's ballast or a water tank.
- There are several species that have been transported in the ballast or water tank of ships.
- Ships must be steady in order to avoid capsizing. The ballast, or weight in the bottom half of the ship, provides stability.
- This weight is frequently derived from water stored in the ship's water tanks or ballast area.
- At the start of the journey, water is added to the ballast. The water is then frequently emptied as a ship arrives at its destination.
- Everything in that water will be drained and dumped in the new site. This is how species like the white perch are introduced to new environments.
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