As we watched the BP Deepwater Horizon oil disaster unfold on beaches and in bays of the Gulf of Mexico four years ago, we wondered, too, about the impacts beyond what we could see on shore. Some of the answers to that troubling question are rolling in. We previously learned about damage to fish embryos, and the latest news involves mahi-mahi, or dolphinfish. These fast-growing, colorful predators are a favorite target of recreational fishermen and restaurant-goers alike across the Gulf, and despite their savage speed, it seems they could not outrun the impacts of BP’s oil.
A new study from the University of Miami last week demonstrated that even “relatively brief, low-level exposure to oil harms the swimming capabilities of mahi-mahi, and likely other large pelagic fish, during the early life stages.” And while it’s troubling to hear that oil reduces the fish’s ability to swim fast – a necessity for finding food and evading predators –the more disturbing revelation is how little oil exposure it takes to cause this damage to such an economically important fish.