Alligator gar making a comeback
This huge, once-hated fish is now seen as a weapon against invasive Asian carp
CHICAGO— It’s a toothy giant that can grow longer than a horse and heavier than a refrigerator, a fear some-looking prehistoric fish that plied U.S. waters from the Gulf of Mexico to Illinois until it disappeared from many states a half-century ago.
Persecuted by anglers and deprived of places to spawn, the alligator gar — with a head that resembles an alligator and two rows of needle-like teeth — survived primarily in southern states in the tributaries of Mississippi River and Gulf of Mexico after being declared extinct in several states farther north. To many, it was a “trash fish” that threatened sport fish, something to be exterminated.
But the once-reviled predator is now being seen as a valuable fish in its own right, as a potentially potent weapon against a more threatening intruder: the invasive Asian carp, which have swum almost unchecked toward the Great Lakes, with little more than an electric barrier to keep them at bay. Efforts are now underway to reintroduce the alligator gar from Illinois to Tennessee.
“What else is going to be able to eat those monster carp?” said Allyse Ferrara, an alligator gar expert at Nicholls State University in Louisiana, where the species is relatively common. “We haven’t found any other way to control them.”
Alligator gar, the second-largest U.S. freshwater fish behind the West Coast’s white sturgeon, have shown a taste for Asian carp, which have been spreading and out-competing native fish for food. The gar dwarf the invaders, which themselves can grow to 1.22 metres and 45 kilograms. The world-record alligator gar was 2.6 metres and 148.3 kilograms, though they can grow larger.
Native Americans once used their enamel-like scales as arrow points, and early settlers covered plow blades with their tough skin and scales. But a mistaken belief that they hurt sport fish led to widespread extermination throughout the 1900s, when they were often shot or blown up with dynamite.
“Some horrible things have been done to this fish,” said Ferrara, adding that sport fisheries are healthier with gar to keep troublesome species like carp under control. “It’s similar to how we used to think of wolves; we didn’t understand the role they played in the ecosystem.”
But the extent to which gar could control carp now is not well-understood, and some people are skeptical.
“I don’t think alligator gar are going to be the silver bullet that is going to control carp by any stretch of the imagination,” said Rob Hilsabeck, an Illinois biologist who says the best hope is that carp will sustain a gar fishery to draw trophy hunters.
Others are more optimistic about the impact once the larger fish is established, which might require cutting notches in canals to give them access to spawning sites. Asian carp reproduce more quickly but alligator gar also grow fast: gar stocked in one Illinois lake six years ago already are more than a metre long.
Quinton Phelps, a Missouri state fish ecologist, said the only way to effectively control carp is when they’re smaller, before they can spawn. Which is where alligator gar come in.
“There is potential for them to be a wonderful weapon, but it’s just potential right now,” he said.