One is a freshwater fish and the other is a sea fish;

The snowfish, grows at the headwaters of the Yangtze River in Aba Prefecture, Sichuan Province, bordering Tibet. The meat is particularly tender. "Snowfish is produced in the upper reaches of the Minjiang River, and is most famous in Minhou County. Fish color white, head small, body side flat and back fat round, scale fine, similar to the shad, taste very rich and beautiful.

The scientific name of cod is Gadus morhua, which is produced in both sides of the North Atlantic Ocean, generally inhabiting the near-bottom layer, and its distribution is brought to the deep-sea area from the near shore. It is a valuable food fish, and its liver can make cod liver oil. It has three dorsal fins, two anal fins, and a palatine whisker. Body color varies from light green or grayish to brownish or blackish, and also from dull red to bright red; the body has dark spots.

Expanded Information

Characteristics

The cod has an extended body, slightly flattened laterally, with a large head, a large mouth, and a maxilla slightly longer than the lower jaw, and a tail that tapers backward to a length of generally 25-40 centimeters, and a weight of 300-750 grams. The length of the tentacle whiskers on the neck is equal to or slightly longer than the diameter of the eye. Both jaws and the plow bone are equipped with fluffy teeth. The body is covered with fine rounded scales that are easy to shed, with distinct lateral lines, three dorsal fins, two anal fins, and all fins are free of hard spines and consist entirely of fin rays.

Body color varies from light green or grayish to brownish or blackish, or dull red to bright red; head, dorsal and lateral sides of the body are grayish-brown with irregular dark brown markings, and the ventral side is grayish-white.

Range

Distributed in the North Pacific Ocean, and on both sides of the North Atlantic generally inhabiting the near-bottom, from the near shore to the deep sea area. Native to the cold waters of the North Atlantic from northern Europe to Canada and the eastern United States. The main cod producing countries in the world are Canada, Iceland, Norway and Russia, and the Japanese origin is mainly in Hokkaido.

China is mainly located in the Bohai Sea, Yellow Sea and the northern East China Sea. There are major fishing grounds in the northern Yellow Sea, east-southeast of Shandong Gaojiao and the southern and southeastern part of Ocean Island.

Habitat

Cold water benthic fish, feeding on invertebrates and small fish. In summer and fall, it inhabits the cold water area of the Yellow Sea, and in winter, it swims back to the mud bottom area of the coast where the water depth is 50~80m to overwinter. Most of the cod live in the Pacific Ocean, the Atlantic Ocean northern water temperature 0 ℃ ~ 16 ℃ cold sea.

Cod to other fish and invertebrates for food, eat more, grow faster, 10 years or so can grow to 1 meter big; food, is a gluttonous migratory fish. It is a voracious migratory fish that is easy to catch because it lives in clusters, and has been a fairly famous food fish since ancient times.

Strong fertility, body length of about 1 meter female fish, once can produce as many as 3 million to 4 million eggs. In the Yellow Sea, the reproductive period is from January to February, and the number of eggs is 340,000 to 830,000, with a diameter of 0.98 to 1.05mm.

The Arctic cod, which is distributed throughout the Arctic region, is a typical cold-water fish, and when the temperature is more than 5 degrees Celsius, it will be out of sight. It is a small to medium-sized fish, with a maximum length of 36 centimeters, and is one of the most important economic fish in the Arctic.

Summer, the Arctic cod mainly live in the Kara Sea area of the Barents Sea, the edge of the ice area. Young Arctic cod feed on small phytoplankton and zooplankton. As it grows, the individual plankton it feeds on gradually changes from small to large and partially preys on small fish.

By September of each year, the Arctic cod begins to migrate to the west and south, and spawns in the winter at sub-zero temperatures, as floating eggs, with a spawning load of 9,000 to 18,000 eggs. Because of the low water temperatures, the incubation period lasts four to five months.

The growth rate of the Arctic cod in the cold Arctic can be said to be very fast, age 3, the average body length of 17 cm, age 4 can be up to 19.5 cm, age 5 for 21 cm, age 6 for 22 cm. The maximum age of Arctic cod can reach 7 years old.

The age of sexual maturity for Arctic cod is usually 4 years, and most of these individuals spawn only once in their lives and stop feeding during the spawning period. After spawning, some cod swim into estuaries or the lower reaches of rivers and then out to sea.

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