Atlantic Wolffish: A Face only a Mother Could Love?

Categories: Creature Features

Bulging of eye and jagged of tooth, the Atlantic wolffish won’t win any beauty contests, but this incredible fish has won our hearts, here at Conservation Law Foundation. OK, so we’re fish people, but we think anyone who gets to know this amazing animal will see the beauty and importance in the Atlantic wolffish. The wolffish, like its name implies, is a keystone predator, or an animal that has a critical ecological function. For example, the predatory wolffish helps keep herbivorous sea urchin populations from exploding and decimating kelp forests. This can provide benefits up the food chain to iconic New England species such as cod and lobster.

Look at the impressive set of canine teeth on this wolffish. It is easy to imagine the unprecedented shell-crushing power that helps them eat whole oysters, crabs and sea urchins. If you can’t imagine it, then check out these little video clips and see for yourself! The shells they crunch up eventually turn into gravelly habitat for other animals, like sea cucumbers.

The wolffish, which has evolved with natural anti-freeze to keep its blood flowing in the deep, ice-cold water of the Gulf of Maine it calls home, can live up to 20 years and weigh as much as 40 pounds. Unlike most fish which broadcast millions of eggs into the water to be fertilized by the male and then abandoned, the wolffish pair up (did you check out the video clips?) to reproduce, and spawning occurs internally. The male then protects the eggs in a nest for up to four months. So much for only getting motherly love!

The wolffish is subjected to tremendous fishing pressure. It is a common bycatch species discarded in New England’s groundfishery, and the trawls and dredges that manage to catch wolffish destroy much of its rocky habitat in the process. Unfortunately, the National Marine Fisheries Service (NMFS) recently decided not to afford this ecologically vital native fish protection under the Endangered Species Act.  NMFS ultimately imposed a ban on wolffish landings but took no action to protect its seafloor habitat. Protecting essential habitat for the Atlantic wolffish may be one way to help ensure its survival in the Gulf of Maine in important areas like Cashes Ledge and Stellwagen Bank.

Bluefin tuna. Photo by Brian Skerry.
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Bluefin Tuna: Value Beyond Measure

Categories: Creature Features

 

Editor’s note: This post is excerpted from my recent book, Ocean Soul.

I’ll never forget the first time I saw a bluefin tuna in the wild for I knew instantly that I was seeing a supreme ocean creature. I had heard reports that bluefin were feeding about 25 miles off the Outer Banks of North Carolina, and so I made three separate trips to Cape Hatteras, with only the last producing any results. On that final trip, in the winter of 1995, I got into the water alone and found myself among dozens of fish, all weighing 500–700 pounds. I watched these majestic fish rocket past me with contrails of bubbles escaping from their gills. I suppose I should have been afraid of being hit by something so large and powerful, but rather than fear I was struck with awe instead. Sun glinted off their reflective torsos and the small, yellow fins near the sickle-shaped tail glowed in the blue water as they fed near the surface. This singular experience fueled my passion for these elusive fish, and ever since I’ve learning all that I can about them and dreamed about swimming with them again.

Fifteen years later I pitched National Geographic magazine on a story about bluefin off the coast of Nova Scotia. It was there that I could find the last of the giants—bluefin weighing as much as 1,200 pounds. They migrated there through New England waters in the fall, to feed on fatty fish such as mackerel and herring. I hoped that in the last few days before the opening of the commercial fishing season, I would get another chance to swim alongside these ultimate beings.

In the dark, green, chilly waters they materialized, massive beings with large eyes that I knew were watching my every move long before I saw them. These fish were nearly 10 feet in length and several feet thick and moved unlike anything else I had seen underwater. I watched them rocket up from the depths, turn on a dime while flashing colors then disappear back into the gloom. I was even more impressed than during our first interaction years before. Ten to fifteen giants swam around me and I spun around three hundred and sixty degrees and looked around on all axes trying to follow their movements. As they passed by I rolled in the wake of their mighty bulk. Mesmerized by this fluid scene, I forced myself out of the trance I was in and began making pictures but just kept repeating over and over in my head, “these are perfect oceanic creatures.”

To be underwater with these magnificent animals is to witness the divine sense of nature. They are true thoroughbreds of the sea, with few if any equals. This is an animal that swims across entire oceans in the course of each year and is capable of generating heat that allows it to travel practically from the equator to the poles. With a streamlined design that has been studied by naval engineers, they swim faster than a torpedo and likely possess physical endurance that we can hardly fathom. It is a warm-blooded fish that continues to grow its entire life—a 30-year-old bluefin can weigh more than a ton.

How I wish everyone saw bluefin tuna the way I have, for being underwater with them I know of their greatness and am certain they possess abilities and hold secrets we can barely imagine. It is no wonder to me that early man painted pictures of bluefin tuna on cave walls in reverence or that Plato mused about their migrations, which once consisted of schools of unimaginable numbers.

Unfortunately, most only encounter tuna on their dinner plates as sushi or the protein entrée next to vegetables and rice. When they think of tuna, by habit they think seafood. They buy fish at markets and in restaurants with little, if any, information about how or where it is caught or under what circumstances. Few know anything about the incredible animal they are eating, and this is, I believe, the essence of the problem in the over-fishing crisis facing our oceans.

Since the end of World War II, commercial fishing fleets have spread throughout the world’s oceans, gathering up its wildlife for food at alarming rates. Scientists have determined that in just the last 60 years more than 90 percent of the ocean’s large predatory fish have disappeared. These include tuna, billfish, and sharks—nearly all gone. Even if these statistics were only half right, it would be a tragic situation, but to lose this many important creatures is devastating. Yet it has happened, and few people have any idea, because so much of what happens in the ocean occurs out of sight.

Bluefin tuna and other large fish of the open ocean have been called the lions and tigers of the sea. Thinking about their terrestrial counterparts is useful, since it throws into relief how differently we think about wildlife on land and wildlife in the sea. I don’t believe that we would allow such a majestic creature as a bluefin tuna to perish from the planet if it lived on land. Nor would we think of eating the top land predators, such as lions or tigers.

Just a few decades ago, bluefin tuna had little or no value. They were caught in New England waters as “horse mackerel” and often buried on the beach or maybe sold as cat food for pennies a pound. As the Japanese developed a taste for sushi in the 1970s, however, things changed rapidly and today bluefin are on the brink. The worldwide lust for sushi has made bluefin the most valuable animals on the planet, with single fish fetching hundreds of thousands of dollars. My hope is that somehow, some way, we can create a new view of these creatures, one in which their value is not calculated in dollars, but rather in magnificence. For if this was the measure, revering them for the incredible creatures they are and the abilities they possess rather than only for their flesh, their numbers would build and the sea would begin to return to the way it once was.

Yellow Sea Raven in Gloucester, MA. Photo by Brian Skerry.

Atlantic Sea Ravens: What’s a bright fish like you doing in a dive like this?

Categories: Creature Features

Like the daffodils and forsythia that brighten up our New England springtime, the North Atlantic sea raven is a garish splash of color in the cold, green waters of the Gulf of Maine – though more unexpected than spring flowers. As David Abel, the Boston Globe reporter lucky enough to go on a recent dive with Brian, describes the surprising sight: “Appearing to be taking a nap on one rock is a bright-yellow sea raven, a monstrous-looking fish about a foot long, with prickly fins, globular eyes, several rows of sharp teeth, and a fleshy mouth ringed with spiny tabs that resemble a poorly groomed beard.”

The sea raven is a member of the sculpin tribe, and, as such, is characterized by a wide mouth, slender body, and large pectoral fins. Sea ravens are not always yellow; their colors range from non-descript browns, to blood red, to the sunburst of color you see in this picture. Robert Glenn, the Chief Marine Fisheries Biologist with the Massachusetts Division of Marine Fisheries, speculates that a sea raven may change colors depending on whether it’s hunting or breeding. According to Glenn, it’s possible that the bright colors emerge in the fall and spring, and are associated with breeding behaviors. But, he says, so little research has been done on this fish that nobody really knows.

While the fish in this picture might look Jimmy Buffet tropical, it has antifreeze in its veins. The sea raven can live at the bottom of Gulf of Maine in temperatures that sometimes approach the freezing point of salt water. Many kinds of sea life make antifreeze, and researchers are looking at the potential commercial application of these compounds, such as better preserving frozen foods, treating hypothermia victims, and making freeze-tolerant crop plants. The chemical composition of the sea ravens’ de-icer is different from every other fish in the sea, and has sparked a great deal of scientific curiosity.

Survival strategies are essential at these icy depths. Formidable rows of teeth and a non-picky appetite allow the sea raven to feed on just about anything it can find, from worms to shellfish to smaller finfish. It doesn’t have to expend a lot of energy hunting, though. The sea raven has a powerful ability to blend in with its background, using coloration and frilly appendages to look like just another algae covered rock. It’s a sit-and-wait predator, and uses its fantastic camouflage to hide in the background until something really big and tasty comes along. Glenn reports that he has found whole Jonah crabs and 16-inch wolffish in sea raven stomachs. This is especially remarkable when you consider that sea ravens only grow to about a foot and a half long, themselves. I would love to be a shrimp on the wall at that dinner party.

Sea ravens are not commercially important (the reason so little research has been done about them), but they are a common bycatch species. Unfortunately, because of their large mouths their stomachs tend to fill with water when they are caught and brought to the surface. Even if they are released alive they cannot deflate rapidly, so they float on the surface where they are vulnerable to predation by seabirds.

Where can you find these fascinating fish? Sea ravens prefer rocky or hard-bottom conditions, like those found in Cashes Ledge, an underwater mountain range 80 miles east of Cape Ann.  This special place is one of the biological treasure chests of the Gulf of Maine that CLF is working hard to protect.

Brian has plans to dive on Cashes Ledge several times over the next few years, and we are very excited to show you what other unexpected gems he finds. Stay tuned!

 

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Longfin Squid: A Meditation in Green

Categories: Creature Features

Why is the water in this beautiful image so green? In short, New England is blessed with rich, productive oceans.

The green in the water is from the chlorophyll found inside tiny phytoplankton that float around and harvest sunlight, turning it into the food that anchors our web of life. All other life in the sea depends on these little energy powerhouses.

The fertile, green waters of the North Atlantic are home to many wonders. The longfin squid featured in this photo are some of my favorites. The squid spend their short lives (less than a year) in coastal waters from Canada to Venezuela. Racecar sleek and gorgeous, the squid use chromatophores in their skin to flash and strobe different colors to suit their mood. Longfin squid school together to reproduce, which they can do at any time of year. Males compete fiercely to breed, and can flash red to warn other males away when they are mating.

Look carefully at the picture, and you can see the squid’s surreal, giant eyes. Squid’s eyes are very similar to our own. Excellent vision, combined with lightening speed (squid are the fastest invertebrate swimmers), make them fantastic hunters. Longfins jet through the water, chasing herring, menhaden, mackerel, and many other fish. They are aggressive predators, and will eat fish almost as big as they are (around a foot long), and will even eat each other. Longfin squid are, in turn, important food for larger fish and marine mammals. These squid are also commercially fished, and odds are good that if you enjoy calamari, you have eaten them.

Look at this sublimely colored image one more time, and think about all the different reasons that green matters to you. From lush, emerald rainforests, to sweeping tallgrass prairies, to the murky green depths of our productive coastal sea, green is the color that feeds us, body and soul.

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March Madness: Right Whales in Cape Cod Bay?

Categories: Creature Features

Welcome back to our wandering whales! North Atlantic right whales are appearing earlier than usual in Cape Cod Bay and if you’re so inclined, you might just be able to see them from the sandy Provincetown shores. Researchers have been surprised to see so much right whale activity in Cape Cod Bay this early in the season. According to Charles “Stormy” Mayo, PhD., senior scientist at the Provincetown Center for Coastal Studies, right whales “swirl around loosely in the Gulf of Maine” year round, probably following areas of high food concentration, but they usually don’t start showing up off Cape Cod in concentrated numbers until April.

Normally these whales would have headed off to the Bay of Fundy (except for breeding females, who head south to calve) last fall and not yet returned. The distribution of most of the right whales during winter and early spring is not known, but they are not usually in Cape Cod waters until late March or April. It’s unclear why the whales enjoyed the Cape early this year, having shown up up in December, but it might be due to increased abundance of small marine mollusks called pteropods, which are also being seen in unusually high numbers for this time of year.

The whales do seem to be eating the pteropods, but Dr. Mayo is concerned that they are not exhibiting their usual feeding behaviors. Normally right whales eat constantly. The whales in Cape Cod Bay are eating much more sporadically, potentially at times of day when the pteropods are congregating near the surface. The researchers at the Provincetown Center for Coastal Studies plan to monitor the whales more closely to try and figure out what’s going on. There were worries last year that the whales were thinner than usual, and were exhibiting some troubling skin conditions, possibly indicating a lowered level of fitness.

Even more troubling, according to the New England Aquarium, there have been fewer mother/calf pairs than usual at their calving grounds in the southeastern U.S., with the number of calves being “markedly lower than it has been in 12 years.” There have also been unexpectedly low numbers of right whales in the Bay of Fundy over the past couple of years. This is worrying news and may affect the long-term recovery of the population as a whole. Every animal matters when the entire population numbers less than 500 individuals.

Researchers are working year round to try and understand more about right whales. It’s hard to study an animal that moves so freely in such a large area, and doesn’t sit still while you take blood samples and put a tag on it. But understanding why the whales go where they do, when they do, and what they do when they get there, is our best hope at protecting them and allowing their numbers to climb back up. And, while there are theories about why the whales are enjoying their spring and summer homes early, there are no conclusive answers yet. “This story is wonderfully intricate and opaque,” says Dr. Mayo. So, for now, the right whale mysteries endure. Stay tuned for more.