Codfish

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Codfish

Last updated: March 5, 2022
Verified by: IMP
Image Credit Miroslav Halama/Shutterstock.com

Codfish Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Actinopterygii
Order
Gadiformes
Family
Gadidae
Genus
Gadus

Read our Complete Guide to Classification of Animals.

Codfish Conservation Status

Codfish Locations

Codfish Locations


Codfish Facts

Prey
Smaller fish, shellfish, crustaceans, worms
Group Behavior
  • School
Fun Fact
They eat other fish
Estimated Population Size
Unknown
Biggest Threat
Humans
Most Distinctive Feature
Beloved food around the world
Other Name(s)
Cod, codling
Gestation Period
8-23 days
Habitat
Pacific and Atlantic oceans
Predators
Humans
Diet
Carnivore
Type
Groundfish
Common Name
Cod, codfish
Number Of Species
3

Codfish Physical Characteristics

Color
  • Green
  • Grey-Brown
Skin Type
Scales
Lifespan
15-25 years
Weight
33-212lbs (15-96kg)
Length
77-200cm (30-79in)

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Cod, also known as codfish, is a type of saltwater fish

The word “cod” is the common name for the demersal or groundfish genus Gadus. The most common species are the Atlantic cod and Pacific cod, which are closely related. Both species are popular as a food with somewhat different flavor profiles, while the livers from both species are used to make the popular home remedy of cod liver oil. Due to high demand, Atlantic cod is vulnerable due to high demand.

5 Incredible Codfish facts!

  • Codfish are carnivorous and eat other fish.
  • They are slow swimmers.
  • They can travel up to 200 miles to reach breeding grounds during the mating season.
  • Females can lay up to 5 million eggs, with most being eaten by other fish and sea creatures.
  • Humans are the cod’s only natural enemies or predators.

Codfish Classification and Scientific Name

The word “cod” refers to the genus Gadus, but specifically to members of the Atlantic cod or true cod family Gadidae as well as three related families in the order Gadiformes. Gadus includes eel, flatfish, ray, and pollock, and “cod” can mean Atlantic cod, Pacific cod, or any species of hake, pollock, haddock, and ling. However, some species belonging to the Gadus genus, such as the Alaska pollock (Gadus chalcogrammus) are not known as cod.

Many fish species in the order Perciformes are also called “cod” although they are not true cods. These include blue cod (Parapercis colias), trout cod (Maccullochella macquariensis), and the notothens (cod icefishes) of the family Nototheniidae containing the Antarctic cod (Dissostichus mawsoni), black cod (Notothenia microlepidota) and Maori cod (Paranotothenia magellanica).

Coral cod, reef cod, and rock cod are also in the order Perciformes. Many species are groupers that are in the same order but in the family Serranidae and subfamily Epinephelinae. Haddock (Melanogrammus aeglefinus) and Whiting (Merlangius merlangus) both belong to the Gadidae family and are sometimes sold as cod.

Codfish Species

There are three official codfish species: Atlantic cod (Gadus morhua), also called haberdine, codling, scrod cod, sacred cod, market or steaker; Pacific cod (Gadus macrocephalus), also called greyfish, grey cod, grey wolf, Alaska cod, true cod or Tara; and Greenland cod (Gadus ogac) also called ogac, which might not be different from Pacific cod. Alaska pollock (Gadus chalcogrammus) is not usually known by its alternative name of snow cod or bigeye cod but as walleye pollock. It is closely related to Atlantic cod.



Codfish Appearance

Both species of codfish have a generally green-brown color that can range from grey-green to red-brown, with a lighter underside and white underbelly. Both have three dorsal fins, two anal fins, and a pair of pectoral fins. They also have a beard-like barbel on their chins, which serves as a sensory organ for finding food. They also have dark speckles on their sides and a white lateral line that extends from the gill slit to the base of the tail and serves to detect motion, vibration, and pressure in the surrounding water. Finally, a structure in the skull called an otolith has visible rings, the number of which determines the cod’s age.

Pacific cod is smaller and darker than Atlantic cod, weighing up to 50lbs (22.7kg) with an average of 33lbs (15kg). True to its nickname of gray cod, it is brownish-gray in color. Atlantic cod can reach up to 220lbs (100kg) with an average of 212lbs (96kg) and has a silvery subcutaneous layer with a body that is yellow-green or red and olive in color. Length-wise they can be anywhere from 77-200cm (30-79in) with an average of 51 inches or over a meter.

Atlantic codfish (Gadus morhua)

Vladimir Wrangel/Shutterstock.com

Codfish Distribution, Population, and Habitat

The Atlantic cod lives in the deep, cold waters of the North Atlantic. Pacific cod lives in both the eastern and western areas of the northern Pacific, including Alaskan and Russian waters. Both can be found at a depth range of 20-200ft with the Pacific cod at 900 m (3,000 ft). As groundfish, they live and feed on the seafloor. While demand for both species is high, Atlantic cod is listed as Vulnerable by the IUCN.

Codfish Predators and Prey

Codfish are a top predator with a diet that is carnivorous and even cannibalistic. They consume a variety of creatures including other, smaller fish (prey fish or baitfish), crustaceans, and invertebrates.

What do codfish eat?

Smaller fish including haddock, mackerel, whiting, worms, mussels, mollusks, lobsters, crabs, squid, and sand eels.

What eat codfish?

Humans are the only natural predator or enemy of codfish, which are apex predators. Juvenile codfish may also become prey to adult codfish.

Codfish Reproduction and Lifespan

The life cycle of codfish starts with spawning. Codfish are slow swimmers but can travel up to 200 miles to breeding grounds during mating season. They can reproduce all year but migrate to warmer waters during spring and winter. Spawning occurs from January to April, with March and April being peak months. Their depth range during this time is 660ft. As part of courtship, male codfish display their fins and grunt.

Females can lay up to 500 million eggs. After they lay the eggs in batches, males compete to fertilize them. The eggs are vulnerable to the elements and most get eaten by other fish and sea creatures. The remaining hatch in 8-23 days, with larvae being transparent in appearance and only 0.16in in length. Their size increases 40 times after 10 weeks as they eat phytoplankton and zooplankton, later consuming small crustaceans. At 6 months they reach 3.1in (8cm) in length. They become sexually mature between 2 to 4 years when they reach a length of 20in (50cm).

The life cycle of codfish follows egg to larvae to juvenile to adult stages. Larvae are called fry, while young codfish are called codlings. Adult codfish can live 13 years or more in the wild depending on the species. Atlantic codfish, for example, live 25 years in the wild, while Pacific cod generally lives 20 years. Differences in the amount of time it takes for juveniles to sexually mature does not change the basic life cycle. For example, cod in the northeast Arctic can take up to 8 years to fully mature.

Codfish in Fishing and Cooking

Codfish that has been dried without salt is called stockfish. The more popular method of preservation, dried and salted cod, is known as salt cod, saltfish, cured salt cod, or clipfish. It is made by drying after salting, also known as salt-curing, making it suitable for long-term storage, year-round export, and incorporation into a variety of dishes. The creation of saltfish has made cod one of the most plentiful, lucrative, and important fish in European fisheries.

Saltfish is a specialty and a unique basis for many codfish recipes around the world. As a major export of the North Atlantic region, it is an ingredient in many Atlantic and Mediterranean cuisines, such as Spanish, Portuguese and Italian. For example, there are several variations of codfish stew and fried cod fritters (also called saltfish fritters or salted codfish cakes) which call specifically for salted codfish.

There are also many dishes that use regular cod. Fish and chips is a popular example that originated in England. While codfish is still the top choice, many vendors replace it with rock salmon or white fish such as halibut, haddock, or plaice. Baked cod, pan-seared cod, fish tacos, fish sticks, fish chowder, cod stew, and cod soup are other examples of dishes that use regular cod. The dense, white, flaky, and mild-tasting flesh of codfish is extremely versatile and fairly interchangeable with other whitefish.

In terms of nutrition, codfish is the fish with the highest amount of protein per calorie, whether it is Atlantic or Pacific cod. Both also provide significant amounts of B-vitamins, phosphorus, and selenium. Codfish is so well-known for nutrition that a popular old family remedy is the use of cod liver oil to treat wounds, arthritis, depression, and rickets. The oil is processed from cod livers from both species and contains highly concentrated amounts of omega-3 fatty acids (EPA and DHA) and vitamins A, D, and E.

Flavor-wise, there are small differences between the two species. Pacific cod has firm, chunky flakes with a milder and more savory flavor. Atlantic cod has bigger, sweeter, firmer, and “flakier” flakes, less moisture content, and a larger market size. While people in the United States are used to Pacific cod and Alaska pollock, people in the UK enjoy Atlantic cod, which they refer to as “scrod” when under 2.5lbs.

Codfish Population

There are several different stocks of each species that are researched for biomass or the number of reproducing females. Pacific cod is not subject to overfishing. However, due to overfishing in the late 20 century, Atlantic cod is a vulnerable species with a significantly decreased population. The rebuilding plan to reach target population levels includes regulations and limited fishing status. Fishing for Pacific cod is also regulated with quotas for fishing traps.

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Codfish FAQs (Frequently Asked Questions) 

What do codfish eat?

Worms, smaller fish, crustaceans, and invertebrates.

Where are codfish found?

The Atlantic and Pacific oceans.

What is a codfish?

A type of predatory saltwater fish in the genus Gadus.

Is codfish the same as cod?

Yes, codfish and cod are used interchangeably. However, “codfish” refers to true cod, while “cod” can be the common name for both true cods and cod-like fish.

What is the difference of Atlantic cod vs. Pacific Cod?

They are two closely related species of codfish differing in appearance, nutrition, and habitat regions.

What is the difference between Haddock vs. Cod?

Cod is in the same family as haddock which is Gadidae, the Atlantic cod or true cod family. Haddock is sometimes marketed as cod. Both are cold saltwater fish but are different in the appearance of their body size and shape, body-color, front dorsal fin, and lateral line. They also taste different, with cod having a mild, clean taste and thicker, firmer fillets that are great for grilling and searing, while haddock has a fishy flavor with thinner and more fragile fillets that are best for frying.

What is the lifespan of a Codfish?

Codfish live for 15-25 years.

How many species of Codfish are there?

There are 3 species of Codfish.

What is a distinguishing feature of the Codfish?

Codfishs are a beloved food around the world.

What is another name for the Codfish?

The Codfish is also called the cod or codling.

How many Codfish are left in the world?

The population size of the Codfish is unknown.

What is an interesting fact about the Codfish?

Codfish eat other fish.

How do Codfish have babies?

Codfish lay eggs.

What is the difference between a salmon and a cod?

The key differences between salmon and cod include their size, fillet colors, and texture of their fillets. Cod are larger than salmon, weighing up to 10 times as much as them and growing far longer than them in the wild.

What is the difference between codfish and flounder?

The main differences between cod and flounder are their size, appearance, hunting methods, and reproduction strategy.

Sources
  1. Wikipedia, Available here: https://en.wikipedia.org/wiki/Cod
  2. Live Strong, Available here: https://www.livestrong.com/article/85245-nutrition-cod-fish/
  3. Soft Schools, Available here: https://www.softschools.com/facts/animals/cod_facts/688/
  4. Fact File, Available here: http://factfile.org/10-facts-about-cod-fish
  5. Health Benefits Times, Available here: https://www.healthbenefitstimes.com/cod-fish/
  6. NOAA Fisheries, Available here: https://www.fisheries.noaa.gov/species/pacific-cod
  7. Fishing Booker, Available here: https://fishingbooker.com/blog/cod-vs-haddock-all-you-need-to-know/

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