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Horseshoe Crab

The Atlantic horseshoe crab. Public domain photo

From the shore, they can look like odd-shaped shadows with tails, moving in and out of the surf or approaching the shoreline.

Up close, they can have a collection of barnacles attached to their shells, particularly as they age.

Horseshoe crabs, who have been roaming the oceans for over 450 million years, have attracted the admiration of researchers and the dedication of volunteers around Long Island, who not only want to ensure they continue to survive, but also would like to know more about creatures that are more related to spiders and scorpions than to the crabs their names suggest.

“One of the things we’re trying to do is look at spawning in a more comprehensive way,” said Robert Cerrato, a professor in the School of Marine and Atmospheric Sciences at Stony Brook University. “We’re trying to figure out if there are specific things that [horseshoe crabs] are responding to” when they come up on the beach to lay their eggs.

A closeup of two horseshoe crabs. Photo courtesy Matthew Sclafani

Horseshoe crabs have had a steady decline in their population over the last 20 years overall. In the last three to five years, however, not much has changed in the Long Island area, scientists explained.

The population is “still very similar to where it was,” said Matthew Sclafani, senior resource educator at Cornell Cooperative Extension of Suffolk County and assistant adjunct faculty member at SBU.

Scalafani and Cerrato have worked together for well over a decade and are hoping to address a wide range of questions related to these unusual creatures that have nine eyes and blue blood.

Apart from the fascination of scientists and volunteers, the horseshoe crab provides a critical food source for shore birds like the Red Knot, which depends on these eggs during their migration.

At the same time, horseshoe crabs and their blue blood provide a key ingredient in tests of pharmaceuticals. When exposed to endotoxins, horseshoe crab blood forms clots.

The use of horseshoe crab blood to test drugs does not occur in New York, however, as companies don’t catch these creatures in the Empire State for this specific test.

Cerrato and Scalafani explained that numerous towns have also limited or banned the harvesting of horseshoe crabs to maintain their local populations.

Areas around West Meadow Beach in Old Field, for example, are closed to hand harvesting, as is Jamaica Bay and Gateway National Recreation Area.

Such policies “theoretically will allow for more eggs on the beach to hatch and for shore birds dependent on them” to find food, Sclafani said. Such closures, including some during the last two weeks in May and the first two weeks in June during the peak spawn were “significant steps for conservation,” Sclafani added.

An aerial photograph taken by a drone during a horseshoe crab survey at Pike’s Beach, Westhampton. Photo by Rory MacNish/Cornell Cooperative Extension of Suffolk County

Ongoing questions

By labeling and tracking horseshoe crabs, these researchers and a team of volunteers hope to understand whether crabs, which are capable of reproducing when they are between 8 and 10 years old, return to the same sites each year to lay their eggs.

Cerrato and Scalafani are hoping to get satellite tags they can attach to adults, so that when they come out of the water to spawn, researchers know their location.

The researchers submitted a proposal to the New York State Department of Environmental Conservation to do a pilot study with these satellite tags.

Juvenile horseshoe crabs also present unknowns, as they have a different diet and migrate at a much lower rate.

“We started to look at” crabs that are 3 to 10 years old, said Cerrato. Moriches Bay is an “important habitat” for them.

Volunteer passion

Volunteers who help count the horseshoe crabs count these creatures often until well after midnight.

Frank Chin has been wandering beaches, counting crabs for 15 years. When he was young, Chin wanted to be a forest ranger.

“I realized that forest rangers don’t make that much money, so I went to school for engineering, got a degree and worked as an engineer,” he said.

Chin found himself at a Friends of Flax Pond meeting, where Scalafani asked for help from the community.

“I foolishly raised my hand and they made me a coordinator,” joked Chin, who counts horseshoe crabs with his wife Phyllis.

Every year presents something new to Chin.

This year, he has run into people who fish late at night. Chin said the fishermen, who have permits, are cordial, but that he’s concerned they might be scaring crabs away from their usual spawning spots.

In addition to counting the crabs, Chin, who is the director of the lab in the Physics Department at SBU, also tags them. He once caught a crab seven years after he initially tagged it.

Chin, who will count crabs in the rain but not in thunderstorms, appreciates the dedication of his fellow volunteers, who not only count the crabs but will pick up garbage and bottles along the beach.

Chin plans to continue to “do it as long as I can walk down the beach.” Some day, he “hopes someone else will take over.”

Volunteers can sign up to join the effort at nyhorseshoecrab.org.

A horseshoe crab no more than 4 years old. Photo by Erika Karp

The Brookhaven Town Board has officially backed Supervisor Ed Romaine’s push for a horseshoe crab harvesting ban at town parks and properties.

At a meeting on July 16, councilmembers unanimously supported a resolution that requests the New York State Department of Environmental Conservation close North and South Shore parks and underwater lands to horseshoe crab harvesting and recommends strategies to reduce the harvesting. State Assemblyman Steve Englebright (D-Setauket) also spoke at the meeting and threw in his support for the effort, as it would help protect the crab population — which, according to some reports, has decreased.

“I support this resolution and encourage its passage and compliment the very fact that it has been initiated,” said Englebright, who chairs the Assembly’s Committee on Environmental Conservation.

State Assemblyman Steve Englebright, right, and a local fisherman, left, speak at a Brookhaven Town Board meeting. Photo by Erika Karp
State Assemblyman Steve Englebright, right, and a local fisherman, left, speak at a Brookhaven Town Board meeting. Photo by Erika Karp

In May, Romaine announced he would seek a horseshoe crab harvesting ban for areas within 500 feet of town-owned waterfront properties. Fishermen often use horseshoe crabs for bait, but the crabs are also used for medicinal purposes, as their blue blood, which is worth an estimated $15,000 a quart, is used in the biomedical and pharmaceutical industries to detect bacterial contamination in drugs and supplies.

Advocates for the ban have said the crabs, whose species is 450 million years old, play a vital role in the ecosystem, as birds like the red knot eat the crabs’ eggs.

Local parks covered within the town’s request include Port Jefferson Harbor; the western boundary of the Mount Sinai inlet; underwater lands and town-owned shoreline of Setauket Harbor; and Shoreham Beach.

The DEC already has bans in place at Mount Sinai Harbor and West Meadow Beach.

In addition, the town asked the DEC to consider mandating fishers to use bait bags and/or artificial bait; banning the harvesting of horseshoe crab females; and establishing full harvest bans several days before and after full moons in May and June — the crabs’ nesting season.

Those latter recommendations were not included in the original resolution, but were added after weeks of discussion on the issue.

Local baymen have said their livelihoods would be jeopardized by any further restrictions, and the seamen remained opposed to the resolution last Thursday. Many also disagreed with officials that the crab population was decreasing.

“If you were with us you would know the quantities are there,” Florence Sharkey, president of the Brookhaven Baymen’s Association, said at the meeting.

Sharkey added that alternative baits have been tried, but don’t work.

Brookhaven Supervisor Ed Romaine holds a horseshoe crab as he calls on the state to ban the harvesting of the crabs within 500 feet of town property. Photo by Erika Karp
Brookhaven Supervisor Ed Romaine holds a horseshoe crab as he calls on the state to ban the harvesting of the crabs within 500 feet of town property. Photo by Erika Karp

Despite the testimony, the Town Board moved forward with resolution, which had been tabled for nearly two months. Councilwoman Valerie Cartright (D-Port Jefferson Station) called the decision a difficult one.

During public comment, Englebright invited the fishers to speak before his committee, as the state is wrestling with the issue as well.

The assemblyman introduced legislation in March that would impose a moratorium on harvesting horseshoe crabs and their eggs until 2021. While the bill wasn’t voted on in the last legislative session, a different bill, which outlines similar recommendations to the DEC regarding crab conservation and management, was approved.

Englebright said the law would be revisited in two years. He said he hoped the DEC would get better data on the crabs in the future as well.

While the state continues to grapple with the issue, Englebright noted the town’s requested ban is different, as it pertains to parkland.

“This is a park and public expectation is different than [at] the general shoreline,” he said. “A park is usually a place that animals have the opportunity to have refuge.”