While many fish may die while awaiting an answer, the sawtooth population is particularly vulnerable. Given that genetic analysis of the smalltooth sawfish population estimates that there could be only around 400 breeding females left, Grubbs said, this sort of unexplained phenomenon is pretty worrisome. Nearly 30 adult sawfish have been confirmed dead, with possibly many more whose carcasses simply haven’t been found, and over 100 live sawfish have been observed exhibiting this odd spinning behavior. That’s a sizable portion of the total population, which doesn’t have a great capacity to bounce back. Researchers think it may take sawfish a decade or more to reach sexual maturity.
The plan to buy the sawtooths time while researchers figure out what’s going on is pretty wild: to capture live sawtooths, take them out of the ocean (so they can’t beach themselves or get any sicker if the problem is being caused by the water), and quarantine them until they recover and researchers have answers. This is not a minor task when talking about an animal 10 to 15 feet long that weighs about as much as a horse and needs to remain submerged. NOAA’s statement last Wednesday listed Ripley’s Aquariums, the research nonprofit Mote Marine Laboratory, and aquarium and pet store supplier Dynasty Marine Associates as three locations where sawfish might be taken for quarantine. To make this work, NOAA also has to find “transport routes,” Grubbs noted. Meanwhile, the testing will continue—of water, of samples from dead sawtooths and other fish, and of samples from healthy fish, which Grubbs and his team helped provide from a recent research trip.
These sorts of mass mortality events, as Marion Renault wrote for TNR last year, are becoming more common. “We’re nowhere close to grasping the repercussions these cascades of death have on ecosystems,” Marion wrote. “One catastrophe makes it more likely that you’ll suffer a second or third,” one zoologist told her. “And every devastation,” Marion wrote, “leaves an ecosystem more vulnerable for the next.”
