New England’s ocean is home to some of the world’s most endangered animals—the Northern right whale—as well as some of the most unusual and charismatic. CLF’s Ocean Conservation experts and esteemed guests go behind the photos to help you get to know these creatures—scales and all.
In August, NOAA scientists conducted a Gulf of Maine cod stock assessment. They discovered that the spawning biomass, or the breeding population, was only three to four percent of its target level—the lowest it has been in 40 years. The strength and viability of a fish population depends on its ability to reproduce. With such a low percent of the needed breeding population, this seemed unlikely for Gulf of Maine cod—the fishery had collapsed.
This announcement left scientist and fishermen butting heads about the accuracy of the assessment and the appropriate next steps to take. And since then, we have been waiting for regional and/or federal regulators to announce a plan of action to address this crisis. Three months later, we have finally received word of an interim emergency action plan.
On Monday, November 10 the National Marine Fisheries Service (NMFS), the federal agency responsible for maintaining our ocean resources and habitats, issued its interim measures in response to the Gulf of Maine cod fishery collapse. The responsibility of issuing emergency action for the remainder of the fishing year was handed off to NMFS after the New England Fishery Management Council (NEFMC) failed to complete the job itself.
NMFS addressed the crisis with two specific goals in mind: provide spawning protection and minimize overall take. They also wanted to act as quickly as possible. The measures which will be in effect from November 13, 2014 to May 15, 2015 include:
Rolling area closures to protect spawning and high aggregation areas based on historical catch locations
Commercial fishermen are limited to a 200 pound catch of cod per fishing trip
No recreational fishing for cod—all cod caught must be thrown back to the sea
Increased gill net use restrictions
Vessels are restricted to fishing in only one Gulf of Maine management area per trip
While it was the hope of some that NMFS would prohibit cod fishing all together, the measures do get at one of the most important aspects of proper fisheries management: habitat protection.
For fish populations, cod in particular, to thrive and be able to withstand fishing pressures, protecting spawning areas is extremely important. Fishermen, many with a lifetime of experience, know exactly where fish congregate and where they will be able to find the most valuable catch. This means however that too often the fishermen target the largest cod. Scientists have discovered that a fish’s fecundity increases with age and size, a theory that is termed the BOFFFF (Big Old Fat Fecund Female Fish) hypothesis. These large cod are the reproducing females that are responsible for keeping population numbers high. Protecting spawning areas is an effort to protect these large females, and therefore ensuring the continuation of a strong population.
NMFS importantly recognized the significance of habitat protection and made a point to not change any existing closure programs in the Gulf of Maine. It had been feared by some that some that these areas, one being Cashes Ledge, would be reopened in order to offset the new rolling area closures implemented through the interim measures. Fortunately, this did not occur.
The overall incentive of the emergency measures was for fishermen to avoid cod at all costs. These are strong measures that they will likely have major impacts on fishermen in the New England area; however, they still may not be enough to turn the cod crisis around. For now, we will just have to wait and see.
The video below provides a simple explanation of how NOAA Fisheries conducts fishery stock assessments (although they are anything but simple), using the Pacific hake fishery as an example.
Feature photo: October 13, Common dolphin jumping a boat wake in the Atlantic Ocean. Artie Raslich/Gotham Whale
The Gulf of Maine is traversed by many species of marine mammals, from soulful harbor seals to the greatest of whales, either as local residents or tourists on their breeding and feeding voyages. Among the most charismatic of all are dolphins. Besides spotting them from whale-watching boats, how much do you actually know about New England’s native dolphins?
“When people think of dolphins, they think of tropical animals,” says Brian Sharp, stranding director for the International Fund for Animal Welfare, located in Yarmouth Port on Cape Cod. “But you’ve really not seen a dolphin until you’ve seen one of the species endemic to New England waters.”
The two species of dolphin most frequently sighted around Cape Cod Bay have one thing in common: their markings look like custom paint jobs. And although striped dolphins, Risso’s dolphins, and the occasional bottlenose will sometimes pass through, it’s these two species of streamlined wave-riders that New Englanders most often spy skirting the edge of the continental shelf.
Common Dolphins (Delphinus delphis)
At 6 to 7 feet long and a svelte 165 to 300 pounds, common dolphins are like “wide receivers” in build, says Tony LaCasse, media relations director of the New England Aquarium and a longtime dolphin rescuer. Even when stranded, common dolphins are communicative, chattering to the other members of their pod through clicks, whirrs, and whistles. Rescuers will often point them towards each other in order to reassure them. They are dark grey and tan with white countercolored bellies, an hourglass shape on their side, and a stripe from their eye to their mouth giving them a masked appearance. They have a long rostrum, or snout.
Even salty, seasoned boat captains describe Atlantic white-sided dolphins as “beautiful.” These cetaceans sport natural detailing of bold white and silver patches on their sides, with a yellow or tan stripe that leads to their tail. At 7 to 9 feet long, and weighing in at more than 500 pounds, they are “girthier” than common dolphins, a look accentuated by their short rostrum. LaCasse compares them to “linebackers:” brawny, husky, and stoic while awaiting rescue at the beach
Most dolphins skim the continental shelf and shelf edge, swimming closer to the coastline if they are hot on the trail of prey such as a school of herring, hake, mackerel, smelt, or anchovies.
Unfortunately, coming near to shore makes dolphins vulnerable to running aground. It’s really impossible to talk about dolphins in New England without giving attention to strandings. Knowing how this phenomenon occurs can help us understand even more about our endemic dolphin species.
Mass strandings in New England have happened longer than humans can remember. Cape Cod Bay, a hooked sandbar with a gently sloping shore, is a notorious trap for dolphins. Anyone who has combed the beaches of the Cape knows that when the tide goes out, it runs out far and fast—so if you are a dolphin who has pursued your prey close to shore, that shallow beach profile with its hidden sandbars can leave you high and dry before you even know what’s happening.
Along the New England coast, “as far as we know, the commonest mass strandings are behaviorally driven, without a human cause,” says Michael Moore, Director of the Marine Mammal Center at Woods Hole Oceanographic Institution. Dolphins, the highly social animals that they are, may follow a sick lead animal inland. Even healthy lead animals can have their echolocation disoriented by mucky water caused by a turn of the tide, or the cloudy aftermath of a nor’easter.
Once dolphins are stranded, time is of the essence in a rescue. Gravity on land presses hard on marine mammals whose skeletons have not evolved to resist its force and protect their internal organs (seals are built to spend significant periods on land, but not so cetaceans). They can suffer significant internal trauma if out of the buoyant salt water for too long. Also, the hot sun can burn dolphin skin in summer, and frostbite can singe it in the winter. There is little temporal margin for error if dolphins are going to be viable again back at sea.
Mass dolphin strandings (from 2 to 20 individuals) occur most often in the winter, from December through April. With the lack of daylight on short winter days, the Northeast Regional Stranding Network monitors and patrols beaches in order to stay ahead of a potential crisis.
Imagine a stranding like a military triage situation. The Cape’s tidal flats can go out a long way, so a dolphin might be stranded as much as a mile from the road. They might be in three feet of tidal mud, or beached on a sand bar far from the water’s edge. Rescuers have refined the use of all-terrain dolphin carts, stretchers with cut-out holes for pectoral fins, and transport trailers that are enclosed and lined to make rescue faster, more efficient, and less traumatic. Even with all that technology, it still can take six people to carry and load a slippery, unwieldy dolphin, so rescuing is muddy, strenuous, and emotional work!
Rescued dolphins are tagged and then released from Herring Cove or Race Point in Provincetown, MA where there are fast drop-offs into deep water. The Provincetown Fire Department sets up lights on the beach to aid rescuers, and trained response volunteers in drysuits walk the dolphins out into the water.
The satellite tags reveal that after a day or two of getting their bearings, even single dolphins usually find their way back to the pod. They will link up with other released dolphins in their family group and then travel together, often heading out towards Georges or Stellwagen Bank… staying well clear of land!
While little can be done to prevent geographically-caused mass strandings, you can support your local rescue network to make sure that stranded animals have a viable chance at survival. Single animal strandings often caused by illness, injury, or entanglement in fishing gear are more complex. In that case, advocating for responsible, sustainable fishing practices will help dolphins and other pelagic species avoid becoming bycatch casualties.
Dolphins are very much residents of New England waters, and there are more of them out there than we might realize: “When you see four or five dolphins at the surface,” says Brian Sharp, “it can be an iceberg effect: that really is a small portion of the number of animals actually around you, below the water and beyond your vision.”
Hopefully what you have learned here will help expand your vision so that you will see our endemic dolphin species even more clearly!
If you find a dolphin stranded south of Boston, please telephone IFAW’s stranding hotline at 508-743-9548. From Boston on north, please dial the New England Aquarium’s Marine Animal Hotline at 617-973-5247. For entanglements or by-caught cetaceans, please call the Provincetown Center for Coastal Studies at 1-800-900-3622.
Are you interested in the kind of creatures that lurk in the dark depths of our New England waters? You can now explore the U.S. Atlantic coast deep-sea ecosystem for yourself!
NOAA’s Okeanos Explorer just wrapped up its 52-day expedition during which a team of scientists collected data on Atlantic submarine canyons and the New England Seamount chain, vastly unexplored areas of our ocean. The expedition consisted of three legs: Leg 1 focused on collecting data over unmapped areas of the New England Seamount Chain, and Legs 2 and 3 used the remotely operated Deep Discoverer to collect baseline data throughout the region.
Atlantic submarine canyons are found between Cape Hatteras, North Carolina and the Gulf of Maine. They are known for their great marine biodiversity and range of critical habitats that connect the outer continental shelf with the deep sea. The New England Seamount Chain is a collection of extinct underwater volcanoes found about 700 miles east of the Northeast U.S. continental shelf. The geological diversity of the chain also gives rise to hotspots of marine biological activity.
Expedition Manager, Brian Kennedy reminds us that “despite the role that oceans play in supporting our well-being, 95% of the ocean remains unexplored. Increasing baseline knowledge of ocean habitats is critical to the conservation and preservation of these remarkable ecosystems.” The data collected from this, and other NOAA expeditions, is invaluable to our nation’s resource managers.
When most of us think of coral, we picture a scene not unlike that found in Pixar’s Finding Nemo: a vast multicolored reef in the warm shallow waters of the tropics, inhabited by a multitude of equally colorful fish. But did you know that many intricate and colorful species of coral can be found right here in our own New England waters? Growing along the ridges of underwater canyons and seamounts off the Atlantic coast, the New England version of a tropical reef plays host to our own aquatic flora and fauna, more suited to the chilly waters of the northwest Atlantic.
Though they resemble undersea plants, corals are in fact colonies of tiny, soft-bodied invertebrates whose secreted exoskeletons form, over time, the large and intricate structures that we recognize as coral. In the warm waters of the tropics, groups of these exoskeletoned colonies form extensive reefs in the clear, shallow waters close to the shore.
Though snorkelers may appreciate the clear waters of the tropics, the water is so clear in these areas because it contains few nutrients or plankton. Very little mixing of the water column occurs in these uniformly warm waters, so nutrients remain trapped on the bottom of the sea, preventing the multiplication of plankton, and leaving the water empty of food. As a result, tropical corals get their nutrients through a symbiotic relationship with photosynthetic algae, which grows inside the coral and lends it energy from the sun. Large animals like whales, however, are unable to sustain themselves by hosting algae. Instead, whales like humpbacks and right whales breed in tropical waters but return to New England to feed in the summer. The constantly mixing warm and cold waters of New England bring nutrients to the surface, encouraging plankton growth, and are thus a veritable soup of life. New England corals enjoy this soup just as much as the whales do, and most of them filter feed instead of relying on algae to do the work for them.
New England corals live not in the near-shore shallows but along underwater canyons and seamounts. Last summer, NOAA’s Okeanos mission documented some of the wide array of marine life in the Northeast’s canyons, including Oceanographer Canyon, a deep underwater channel that cuts into the southern edge of Georges Bank. You can see images and video from the mission here. The seamounts are part of the New England Seamount Chain and often rise to within 100 feet of the ocean surface, ensuring a rich habitat for undersea creatures due to the high concentration of particulates in the water and the nearness of sunlight.
Unfortunately, cold water corals grow slowly and are very susceptible to the effects of trawling, which is why Fishery Management Councils along the east coast have begun to take action to protect areas like canyons and seamounts with rich deep-sea coral populations.
New England’s corals are surrounded by towering kelp forests, fish and mammals of all kinds, and even sea turtles. So if you’ve ever wanted to dive the Great Barrier Reef, but balked at the idea of that plane ticket to Australia, consider exploring the underwater scenery right in our own backyard!
It’s been a good summer for shark conservation. On July 24th, Massachusetts Governor Deval Patrick signed a bill banning the possession and sale of shark fins in the state. While the 2010 Shark Conservation Act passed by Congress had prohibited shark finning and required sharks harvested in state waters to be brought to shore whole, it did not eliminate the market for imported shark fins in the U.S., where shark fin soup is sometimes priced at $100. With Massachusetts’ ban in place, a total of nine U.S. states and three U.S. territories have now joined in efforts to eliminate finning altogether.
Last month, scalloped hammerheads made national news when the species became the first shark to be placed on the U.S. Endangered Species List. The scalloped hammerhead is threatened by the commercial fishery for its fins—the sharks are highly valued in the fin trade because of their fin size and high fin ray count. They are also caught as bycatch by offshore longlines and gillnets.
This shark is found in warm and temperate waters across the globe; four scalloped hammerhead shark populations were placed on the endangered species list. The Eastern Atlantic and Eastern Pacific scalloped hammerheads were listed as “endangered,” and the Central & Southwest Atlantic and Indo-West Pacific scalloped hammerheads were listed as “threatened.” This listing prohibits the catch, sale, and trade of scalloped hammerheads in the United States.
These actions are a win for shark conservation, and they build on other state and federal protections for the approximately 400 shark species in the world, about 40 of which are found in U.S. waters. In New England, there are at least 26 shark species protected by state catch limits, size minimums, types of equipment permitted for use or a prohibition against their harvest. Some of the popularly-known protected sharks that cannot be harvested in New England include the great white (Carcharodon carcharia), basking (Cetorhinus maximus), longfin mako (Isurus paucus), and sand tiger shark (Carcharias Taurus).
Why protect the feared kings of the sea? Well, first of all, they’re just cool, and as this video shows, they’re not as dangerous as most people think.
Unfortunately, sharks take a relatively long time to grow to maturity, produce few offspring, depend on wide swaths of intact ocean habitat, and are very sensitive to ecosystem changes. All of that means they’re exremely vulnerable to the effects of overfishing and habitat loss. Nearly half of the shark and ray species assessed by scientists for the International Union for Conservation of Nature are threatened or near-threatened with extinction, and around 100 million sharks are killed every year in commercial fisheries.
So while there have been some steps in the right direction, there’s still plenty more we can do to protect these great ocean fish, from research to habitat protection to improved fisheries management and bycatch reduction. The health of our marine ecosystems depends on it.
In “Ocean Soul,” world-renowned National Geographic photographer Brian Skerry says, “It’s been said that sharks have remained unchanged for hundreds of millions of years because they are perfect and that no further evolutionary change is necessary.”
Sharks have certainly reached the top of the food chain as the ocean’s apex predators. Apex is a word of Latin origin meaning peak or tip. In ecological terms, apex is used to describe an animal that has no natural predator within its ecosystem—terrestrial examples include wolves and cougars.
Although humans might find them terrifying, apex predators are crucial for maintaining healthy ecosystems. Sharks, for example, play a vital role in balancing ocean food webs. They aid in population control of smaller predators, so that prey species are able to exist at healthy levels. They also regulate the behavior and abundance of prey species, protecting habitat like seagrass beds and coral reefs from overgrazing, and promote biodiversity by preventing any single prey species from monopolizing resources.
Sharks also tend to prey on weak or sick members of a species, so as to minimize their caloric hunting expense. This natural tendency towards efficiency promotes healthier populations by advancing the transmission of strong genes, as weaker genes are taken out of the gene pool.
Despite the enormous amount of good we know sharks do for ocean ecosystems, humans hunt sharks for their meat, especially their fins. Sharks can also become collateral damage to commercial fishing for other species—accidental net entanglements or hooking often prove lethal. According to a 2013 report published in “Marine Policy,” humans killed approximately 100 million sharks in 2000, and 97 million in 2010. Annually, humans kill between 63 and 273 million sharks.
What happens when the oceans begin to feel the loss of sharks? Populations of smaller predator species boom, stressing habitats and depleting populations of prey species. These changes can be very detrimental to the fishing industry. For example, depleted great white shark populations have been linked to the boom in gray seal numbers in New England, and the voracious appetite of the seals may be harming the recovery of overfished cod. In North Carolina, a decline in large sharks because of overfishing led to an increase in cownose rays, one of the sharks’ prey species. Cownose rays eat shellfish, and so an increase in their population caused the bay scallop fishery to collapse.
Clearly, apex predators like sharks are absolutely critical to maintaining healthy marine ecosystems. The role of apex predators is better understood today than ever before, and now that we know how vital their role is, it is time to protect and respect the ocean’s top predators.
The Discovery Channel’s Shark Week starts in just ten days! As ocean fans around the world gear up for the annual celebration of all things shark, New Englanders are turning their eyes to the North Atlantic Great white population. It seems these days Cape Cod beachgoers can’t help but scan the ocean horizon for a dorsal fin before taking a chilly but refreshing dip.
This year’s Cape Cod shark-spotting season kicked off on June 23rd when Captain Tyler Macallister captured video footage of a great white, Carchardon carcharias, six miles southwest of Provincetown, in Cape Cod Bay. Upon seeing the shark, Macallister began recording his calm and somewhat mystical encounter with the estimated 16-to-18 foot great white. A Massachusetts Division of Marine Fisheries biologist confirmed that the fish captured on Macallister’s video camera was a great white, but that the lack of scale in the footage meant its size could not be accurately determined.
Five days after Captain Macallister’s encounter with a great white shark in Cape Cod Bay, researchers from the Atlantic White Shark Conservancy saw a great white one-quarter of a mile off of Nauset Beach, near Orleans, Cape Cod. The researchers were able to identify the fish as a 12-to-14 feet long female great white and named her “Ping.” Ping was first spotted by a spotter plane and then tracked by boat. The Atlantic White Shark Conservancy sends out both a spotter plane and boat twice a week to study Ping and other great whites.
The increase in great white shark sightings has been going on for the last decade or so, and in the Cape Cod area it’s been partially attributed to the growing gray seal, Halichoerus grypus, population around the Cape. Gray seals were previously hunted by fishermen as a precaution towards preserving fish populations that the Gray seals consume, but the seals are presently protected by the Marine Mammal Protection Act of 1972. Great white sharks prey on seals and as seal populations expand in the Cape Cod area, there appears to be a growing number of white sharks.
If you are curious where these sharks spend their days, when they are not busy stalking Cape Cod’s massive seal populations, you can track tagged sharks through Ocearch.com or through the Ocearch app. And get ready for more information on New England’s sharks as we celebrate Shark Week here at New England Ocean Odyssey!