What kind of fish are oil fish and cod? The difference between them is introduced!

Oil fish and cod are not only fish, they also look similar, but cod is more expensive than oil fish, so there is a phenomenon of fishing in troubled waters on the market. So what's the difference between oily fish and cod?

What kind of fish is oil fish?

1. Oil fish is a fish of the genus Cyprinidae, Cyprinidae and Springfish. it is the general name of spiny snake mackerel and different scale snake mackerel, which is commonly found in the tropical and temperate oceans of the world. China is distributed in the upper reaches of the Yangtze River and Minjiang River, Tuojiang River, Xijiang River and Qianjiang River. It lives in mountain streams or caves with running water and springs in rivers, and feeds on diatoms and aquatic insect larvae.

2. Oil fish belongs to deep sea fish, which lives in the middle and lower layers of the waters with high flow velocity of rivers in southern China; the body is about 20 cm long, and the body is slightly longer; the upper part of the body is black or bluish black, the ventral surface is gray-white, and the fins are slightly black. from the back of the Gill hole to the front of the pectoral fin, the black patches are thicker and form a large black spot; most of the lateral scales have black edges, the scales are medium and the abdominal scales are small.

3. Oil fish has more than 40% wax ester, because the melting point of wax ester is as high as 1000 ℃, which can not be decomposed and absorbed by the human body, which can lead to diarrhea, gastrointestinal spasm and so on. Because its fat content is more than 20% and is used by industry to extract oil, it is called "oil fish". It is mostly used for industrial purposes in foreign countries, and citizens are not advised to eat it in many countries.

4, oil fish taste sweet, sexual flat, beneficial to the kidney and spleen, hemostatic effect, often used for chronic dysentery, hematemesis, metrorrhagia.

What kind of fish is cod?

1. Cod is a cod-shaped order, cod family, cod fish. There are three species of fish, namely, Atlantic cod, Greenland cod and Pacific cod, which are distributed in the continental shelf waters on both sides of the North Pacific and North Atlantic Ocean. China is mainly distributed in the Bohai Sea, the Yellow Sea and the northern East China Sea. It lives in the cold water area of the Yellow Sea in summer and autumn and swims back in the coastal muddy area with a water depth of 50m to 80m in winter, feeding on invertebrates and small fish.

2. Cod is a cold-water benthic fish, generally living near the bottom (water depth 0-2740 meters); the body length is generally 25-40 cm, the body is extended, slightly flattened; the body color is varied, from light green or light gray to brown or light black, it can also be dark red to bright red, the head, back and side of the body are grayish brown, and have irregular dark brown markings, the ventral side is grayish white; the body is small and scaly.

3. Cod is a cold-water benthic fish and one of the marine economic fish produced along the northern coast. Many countries in the world regard it as the main edible fish. For example, northern Europe calls it "the dietitian on the table". It is also processed into a variety of aquatic foods. in addition, cod has large liver and high oil content, rich in vitamin An and D, and is the raw material for extracting cod liver oil.

4. Cod is sweet and flat, with the effect of promoting blood circulation and relieving pain and defecation. it is often used for falling fracture, traumatic bleeding and constipation.

Third, the introduction of the difference between oil fish and cod!

First, the families and genera are different: oil fish are cyprinid, cyprinidae, spring fish, the general name of spinoscale mackerel and heteroscale mackerel, while cod is cod, there are three kinds of fish in cod, namely Atlantic cod, Greenland cod, and Pacific cod.

Second, the distribution is different: oil fish is distributed in the upper reaches of the Yangtze River, Minjiang River, Tuojiang River, Xijiang River and Qianjiang River in China, while cod is mainly distributed in the Bohai Sea, the Yellow Sea and the northern East China Sea.

Third, the fish scales are different: the scales of cod are relatively small, with small silver dots, and the scales are so sharp that they feel like needles, while the scales of oil fish do not have this characteristic.

Fourth, the body color is different: the body color of oil fish is black or bluish black, the ventral surface is grayish white, each fin is slightly black, and most of the side scales have black edges; cod have various body colors, from light green or light gray to brown or light black, or dark red to bright red, with grayish brown irregular dark brown markings on the head, back and side of the body, and grayish white on the ventral side.

Fifth, the meat color is different: the cross section of cod is large, the skin is white or grayish white, the color of meat is white and there is no obvious thick red line, and the meat is delicate, while the cross section of oil fish is small, the skin is grayish black and has a network, the color of meat is yellow and has a yellowish or reddish line, the meat is hard and rough.

Sixth, the feel is different: cod will feel smooth after thawing, like a layer of mucus film, while oily fish has a rough touch and is not as smooth and delicate as cod.

Difference 7, different taste: oily fish tastes very greasy, cooked meat is very rough, taste is poor, while cod meat is very delicate, there are unique fragrance and fresh taste, taste is very good.

The above is the introduction of the difference between oil fish and cod, mainly from the aspects of family and genus, distribution, fish scale, body color, meat color, feel and taste. Everyone in the market should choose and buy carefully, do not mistake oil fish for cod, so as not to waste money.