Big Pacific: Wolf eels, the marine monogamists

From pages 36-38 of Big Pacific:

Beneath the green waters of coastal British Columbia, one species sets the bar for enduring long-term relationships. The Wolf eel — actually a type of fish called a blenny, rather than a true eel — lives out its entire life with its chosen mate, even remaining single for the rest of its life when its partner dies.

Their large heads and fierce-looking mouths make them appear dangerous, but they are only aggressive towards other Wolf eels.

Here in the Pacific’s Northeast, the sea is cold, with an average annual water temperature of around 10° Celsius (48 to 50° Fahrenheit). Cold water is richer in oxygen and this gives the entire food chain a boost, leading to larger — albeit slowergrowing — organisms. The Wolf eel is no exception to this rule; it can grow up to 2.5 meters (8 feet) in length, weigh up to 40 kilograms (88 pounds) and live for more than 30 years, most of it spent tucked away in a rocky crevice with its partner. Female Wolf eels settle down with their chosen mates at around seven years of age, when they will lay up to 10,000 eggs at a time. Once hatched, Wolf eel larvae leave their parents’ lair to drift in sea currents. Juvenile Wolf eels spend their early lives in the mid-depths of the open ocean, but as they mature they head to shallower water. Eventually they find a mate and a den, and spend the rest of their lives together in the security of their home, emerging only to hunt for prey.

Big Pacific: Passionate, Voracious, Mysterious, Violent
By Rebecca Tansley

The Pacific Ocean covers one-third of Earth’s surface—more than all of the planet’s landmasses combined. It contains half of the world’s water, hides its deepest places, and is home to some of the most dazzling creatures known to science. The companion book to the spectacular five-part series on PBS produced by Natural History New Zealand, Big Pacific breaks the boundaries between land and sea to present the Pacific Ocean and its inhabitants as you have never seen them before.

Illustrated in full color throughout, Big Pacific blends a wealth of stunning Ultra HD images with spellbinding storytelling to take you into a realm teeming with exotic life rarely witnessed up close—until now. The book is divided into four sections, each one focusing on an aspect of the Pacific. “Passionate Pacific” looks at the private lives of sea creatures, with topics ranging from the mating behaviors of great white sharks to the monogamy of wolf eels, while “Voracious Pacific” covers hunting and feeding. In “Mysterious Pacific,” you will be introduced to the Pacific’s more extraordinary creatures, like the pufferfish and firefly squid, and explore some of the region’s eerier locales, like the turtle tombs of Borneo and the skull caves of Papua New Guinea. “Violent Pacific” examines the effects of events like natural disasters on the development of the Pacific Ocean’s geography and the evolution of its marine life.

Providing an unparalleled look at a diverse range of species, locations, and natural phenomena, Big Pacific is truly an epic excursion to one of the world’s last great frontiers.

Learn more by watching Big Pacific, airing on CPTV Spirit on Sundays at 9pm ET.

Watch the trailer below:



This post is part of a series, explore additional posts here<< Big Pacific — The Blue WhaleBig Pacific: The Yellow-eyed Penguin, A Model Parent >>