August 17, 2016 — PORTLAND, Maine — Environmental regulators studying the harvesting of horseshoe crabs that are drained of some of their blood for biomedical use say they need to get a firmer handle on how many die as part of the process.

The crabs, which have been on earth for hundreds of millions of years and are older than dinosaurs, are harvested because their blood contains coagulogen, a chemical used to make sure medical products aren’t contaminated by bacteria. The Atlantic States Marine Fisheries Commission, an interstate authority, voted this month to propose taking into account the death toll associated with medical harvesting when determining the number of horseshoe crabs that can be harvested from the Delaware Bay.

The medical harvest of horseshoe crabs is about 500,000 crabs per year. The prehistoric-looking crabs typically are taken to labs, are drained of about a third of their blood and then are released alive into the same bodies of water where they were found, a spokeswoman for the commission said on Tuesday.

It’s unclear how many of the crabs die in the process, but the estimate is about 15 percent, said Kirby Rootes-Murdy, a fishery management plan coordinator with the fisheries commission. A firmer idea of how many die is important because of the crabs’ place in ecosystems, such as their role as a food source for endangered birds, Rootes-Murdy said.

Read the full story from the Associated Press at the Virginian-Pilot