Common name: Wolf Eel Scientific name: Anarrhichthys occelatus Size range: The Wolf Eel has been found to grow up to an average of 2 meters (8 feet) in length.
Common name: Wolf Eel
Scientific name: Anarrhichthys occelatus
Size range: The Wolf Eel has been found to grow up to an average of 2 meters (8 feet) in length.
Sometimes referred to as the “Ugly old man of the sea,” the Wolf Eel has a bulbous head with a strong jaw and sharp teeth. The adult Wolf Eel ranges from light brown to dark gray in colour, with a long, dot-covered body. These dots may differ in size and colour depending on the individual and its gender, and are frequently surrounded by a light ring. It is easy to differentiate between male and female wolf eels; the males tend to have larger, more grotesque heads, whereas the females possess a smaller jaw and are often darker in colour. Juveniles are a startling orange marked with dark orange splotches. The wolf eel’s dorsal fin extends from its head to the tip of its sleek body; its pectoral fins, located at the base of the head, are large and rounded.
The Wolf Eel has been found to live anywhere from Japan to the islands of Racerocks off of British Columbia’s coast. It tends to keep to shallow to medium depth waters, making its home in the hollows between rocks, which oftentimes look as though they would not be able to fit its wide head. The deepest a Wolf Eel has ever been uncovered is 225 meters below the surface.
The Wolf Eel is a rather intimidating-looking carnivore, adapted perfectly to suit its murky environment. Its jaw is designed especially for mowing down on hard-shelled creatures such as crustaceans, mussels, clams, sea urchins, snails, and some other fish.
Although full-grown Wolf Eels have next to no predators (save the occasional harbor seal), their eggs often fall prey to rockfish and Kelp Greenlings.
Wolf Eels are unique in the way they go about their lives because (despite how they may initially appear) they are in fact quite the romantics- they mate for life. These creatures seek out their partners at four years of age, but will not reproduce until around seven. The male will court his female first by bumping his head up against her abdomen, then enveloping her entirely with his long slender body. Females can produce up to an astounding ten thousand eggs at once. The parents will closely guard their offspring for a period of around sixteen weeks, until at last they hatch.
Photos by D. Young and Mature Wolf Eel photo kindly provided by Erik Schauff
Video by Allie Graff
Tidepool Sculpin Common Name: Tidepool Sculpin Scientific Name: Oligocottus maculosus Size Range: up to 9cm (3.5 inches)
Common Name: Tidepool Sculpin
Scientific Name: Oligocottus maculosus
Size Range: up to 9cm (3.5 inches)
Identifying Features: All Tidepool Sculpins look very similar to one another, though distinct from other tide pool creatures. They have long, thin bodies with big heads and stripes all the way down the length of their body. Frequently you will find around 5 stripes on their body. Common Tidepool Sculpin colouring is grey or green, but their colour is not limited to that; you can find tidepool sculpins of almost every colour.
Habitat: Tidepool Sculpins are salt water fish that live in tidepools and in sheltered intertidal areas. They are usually found near rocks in the low-level of the tide pool. Tidepool Sculpins have been known to live in water as cold as 0.5C (33 F). Interestingly enough, Tidepool Sculpins are able to find their way back to their favourite tidepools following a high tide.
Food: Tidepool Sculpins eat small Invertebrates, isopods, amphipods, shrimp and worms. They can change the colouring of their bodies to blend in with their surroundings allowing them to ambush their prey. By surprising their prey and quickly chowing down, it is an effective way to hunt.
Predators: Tidepool Sculpins have a number of predators. Common predators of the Tidepool Sculpin are the Great Blue Heron (Ardea Herodias), larger fish and crabs but they are also likely eaten by other shore birds, river otters and foraging raccoons. Luckily for them, they were graced with speed and the ability to blend and hide allowing them to protect themselves from creatures who would like to eat them.
Life Cycle: Tidepool Sculpins generally live to be 5 years old. They are oviparous, meaning they lay eggs. The color of the eggs can vary depending on where they are laid. Typically they will be green or pink. It falls on the fins of the male tidepool sculpins to watch the eggs for the majority of the time.
Photographs and video by D. Young and E. Pringle
Common Name: Spotted Ratfish Scientific Name: Hydrolagus colliei Size range: 7.5–10 inches, varying on sex and maturity.
Common Name: Spotted Ratfish
Scientific Name: Hydrolagus colliei
Size range: 7.5–10 inches, varying on sex and maturity.
Identifying features : The Spotted ratfish is a cartilaginous shark relative. It has many distinctive features and is in the chimaera family. It is said to look like a rabbit and its scientific name: Hydrolagus colliei, literally translates to “water hare.” The H. colliei has plate-like permanent teeth and a large, bulky, snout-like snub nose. The Spotted Ratfish’s body tapers towards its posterior end and composes about half of its length. The spotted Ratfish can reach sizes of 14-20 inches long (body length) and females usually reach a height of 10 inches at their mature stage, most young specimens tend to measure in at around 5 inches. The Spotted Ratfish has a large, sharp and venomous dorsal fin that can inflict a painful wound; and a long, leaf-like and delicate fin follows the dorsal. This long fin undulates which gives it the appearance of being three separate appendages. The Spotted Ratfish also has two pectoral fins which extend straight out from its body, similar to airplane wings. One of the H. colliei’s most distinctive feature is it smooth, scale less and iridescent skin. Its colouring can range from silvery to a golden green usually with a darker brown background that reflects light; the fish is also usually covered in white, opalescent spots which helps add to its distinctive luster. Another particular feature is the Spotted Ratfish’s large eyes; they are often green in colour and reflect light, much like those of a cat.
Habitat: The ratfish is usually found in depths of 1000-2000 ft. deep in anywhere between southern pacific waters to northern pacific waters. It may also be found in some parts of European waters. A great place to see the spotted ratfish locally while diving is just off of Ogden point, Victoria, British Columbia. The ratfish tends to favour waters near the cost of B.C, California and Alaska. When food in the deeper waters becomes scarce the H. colliei will often move to shallower waters, hanging near the ocean floor.
Food/Prey : The Ratfish enjoys a diet of crustaceans, marine worms, small fish and mollusks. The ratfish is able to grind the shells with its plate like teeth. The spotted ratfish is also a chronicled cannibal, often eating their own egg cases as well as other ratfishes.
Predators : Marine species who feed on the Ratfish include different types of sharks such as the six gill shark, seven gill sharks, tope sharks, the spiny dogfish, and big carnivorous fish such as the giant sea bass, ling cod, rock fish, Pacific Halibut, and other marine mammals (such as seal, orcas, porpoises etc.) Humans do not consume the Ratfish as they are unpalatable, it can also inflict a painful wound with its venomous dorsal fin and may also give a painful bite.
Life Cycle: The Ratfish begins its reproduction cycle during the autumn/spring seasons by conducting complicated courtship patterns during the mating season; both sex’s complete distinct manoeuvers and the males undergo extensive color changes. The females begin to expel eggs in pairs; they birth these eggs into muddy areas every 10-14 days and their fertile period will last several months. The female ratfishes labor can last anywhere between 18-30 hours. The eggs then hang freely from their mother attached by a thin filament. They hang attached for 4-6 days until they are planted in the ground. The eggs begin to hatch around a year later, which means the baby fish goes through a long gestation period and is born relatively matured. The young usually appear from the case at approximately 5.5 inches and grow about 11.8 inches in their first year.
Photos courtesy of Andy Murch at www.elasmodiver.com
Illustration by Alberta Trelawny
Spiny Dogfish Scientific Name: Squalus suckleyi ( Also referred to as Squalus acanthia suckleyi) Common Name: Spiny Dogfish or Piked Dogfish Maximum Size: 160cm (63 Inches) Size at Maturity: Males 56-80cm (22-31 1/2 inches), Females 60- 100cm (23 ½ -39 ½ inches)
Scientific Name: Squalus suckleyi ( Also referred to as Squalus acanthia suckleyi)
Common Name: Spiny Dogfish or Piked Dogfish
Maximum Size: 160cm (63 Inches)
Size at Maturity:
Males 56-80cm (22-31 1/2 inches), Females 60- 100cm (23 ½ -39 ½ inches)
The Spiny Dogfish has no anal fin. The dorsal surface is bluish grey or brown with distinct small white spots. It has a slender and elegant body, with quite a flat head. The snout is slender, narrowing down to a pointed edge. It also has five short gill slits. Spines are visible in front of each dorsal fin.
The Spiny Dogfish lives on continental shelves, insular slopes, and upper slopes. They live in depths of 30.5 – 92 metres (100-300 ft) with males living in shallower water than females. They are comfortable in temperatures of 6 – 11C (43-52 F).
Spiny Dogfish love to eat bony fish such as salmon as well as cartilaginous fish. They have a very diverse diet that can include cephalopods, gastropods, crustaceans, sea cucumbers, ctenophores, hydrozoans, jelly fish, squid, octopus, herring, menhadens, capelins, sand lances, and mackerels. They travel and hunt in packs. The pack size can range from hundreds to thousands of Spiny Dogfish. The pack is sometimes segregated by gender. Spiny Dogfish are frequently spotted hunting in packs.
Some of the predators of Spiny Dogfish include cod, red hake, goose fish, and other Spiny Dogfish. They use their spines on the dorsal fin to defend themselves. Despite having venom in the spines many fish will still attack and eat the Spiny Dogfish. It also curls up into a bow and strikes at any predator that threatens it.
Males mature at 11 years and females become mature at about 18 to 21 years. They typically mate during the winter. Mating is ovoviviparous. Mating usually takes place in offshore waters and it is internal fertilization. Once the eggs are fertilized, the mother produces a thin, horny, transparent shell around them called a candle, and here they develop within her body feeding off the egg yolk. The litter can range anywhere from 2 to 11 pups and are approximately 20-30cm at birth. The gestation period of the Spiny Dogfish is 18 to 24 months, one of the longest of any vertebrates. They live for at least 44 years but can live for as long as 100 years. The population has decreased drastically over the years due to the fact that it takes them a long time to mature and they have such a lengthy gestation period. They are fished to be used as pet food, fish and chips, fertilizers, oils, and a cheaper version of shark fin’s soup.
Photo kindly provided by Andy Murch
Interesting resources for research and photographer credit
Victoria High School
1260 Grant St.
Victoria. BC, Canada