CATDOLL : CATDOLL: The life habits of Arctic cod

1. The life habits of Arctic cod

Arctic cod Most cod live in the cold seas of the Pacific and the northern Atlantic Oceans with water temperatures ranging from 0℃ to 16℃. They eat anything that moves and eat a lot, so they grow fast and can grow to 1 meter in about 10 years. They also have strong reproductive capacity. A female fish about 1 meter long can produce 3 million to 4 million eggs at a time. Because they live in groups, they are easy to catch and have been a very famous edible fish since ancient times. Origin and production season: distributed in the North Pacific. It is produced in the Yellow Sea and the northern East China Sea in China. The main fishing grounds are in the northern Yellow Sea, southeast of Shandong Gaojiao, the southern Ocean Island and the southeastern sea area. There are two fishing seasons, winter and summer. The winter season is from December to February of the following year; the summer season is from April to July. Cod is distributed in the northern part of the Northern Hemisphere. The model species is the European cod, with a short and narrow head, and the front lateral process of the swim bladder is about the same length as the swim bladder width; the middle process of the rear edge of the tongue and jaw is nearly perpendicular to the upper process; the body length can exceed 1.5 meters and weigh 40 kilograms; it has the phenomenon of spawning and migrating for food, and is an important target for bottom trawling; it is distributed in the Atlantic Ocean north of 40° north latitude to the Arctic Sea. In the cold currents along the coast of the Yellow Sea and Bohai Sea in China and the cold water mass of the Yellow Sea, there is a bighead cod with a relatively wide head, which feeds on small fish and mollusks and lays floating eggs around the end of spring; the body length can reach 720 mm; it is distributed in the northern part of the North Pacific.

2. Geographical location of Newfoundland fishing grounds

The Newfoundland fishing ground is located in Canada, in the waters near Newfoundland Island in the Atlantic Ocean. It is one of the world's famous fishing grounds. It is as famous as the Hokkaido fishing ground in Japan, the North Sea fishing ground in Europe, and the Peruvian fishing ground. Located at the intersection of the Gulf Stream and the Labrador Current, the disturbance of the sea water causes the nutrient salts to rise, providing rich bait for fish, and fish reproduce in large numbers here. It is known as "you can walk ashore by stepping on the backs of cod in the water."

3. Reading answers include the following

Answer: 1. ①Special appearance (1 point) ②Special breeding habits (1 point)

2. (Easy) Ensure that all eggs develop into small seahorses. (2 points)

3. The shallow sea conditions are extremely dangerous. (2 points)

4. Reference example: Paragraph 1 vividly describes the underwater world; the title and other places describe seahorses as people; Paragraph 4 raises questions and arouses suspense. (Full marks for one correct answer) (1 mark for finding out without explaining) (2 marks)

4. What are the fisheries in the world?

Overview: From the perspective of the impact of ocean currents on fishing grounds, there are four major fishing grounds in the world:

1. Hokkaido fishing ground: It is formed by the confluence of the Japan warm current and the Kuril Islands cold current.

2. Newfoundland fishing ground: formed by the confluence of the Gulf Stream and the cold Labrador Current.

3. North Sea fishing grounds: formed by the confluence of the North Atlantic warm current and the East Greenland cold current.

4. Peruvian fishing grounds: formed by the upwelling compensation current along the coast of Peru. [Edit this paragraph] Reasons for formation

Taking all factors into consideration, marine fishery resources are mainly concentrated in coastal continental shelf waters, that is, the part of the continental seabed extending from the coast to about 200 meters underwater. Here, sunlight is concentrated, biological photosynthesis is strong, and rivers flowing into the sea bring rich nutrients, so plankton is prosperous. They are bait for fish and are generally more common in temperate seas. Temperate seas have significant seasonal changes. In winter, the surface seawater and the bottom seawater are exchanged. The upwelling seawater contains rich nutrients, which is conducive to the reproduction of plankton. In addition, bait is also abundant where cold and warm currents meet and cold seawater rises.

The Hokkaido fishing grounds in Asia, the North Sea fishing grounds in Europe, and the Newfoundland fishing grounds in North America are all formed by the confluence of cold and warm currents. Only the Peruvian fishing grounds in South America are formed as a world-class large fishing ground due to the prevailing upwelling compensation currents along the coast of Peru, which bring nutrients from the deep sea to the surface, promote the massive reproduction and growth of plankton, and provide sufficient bait for fish.

The offshore wind (wind blowing from land to sea) prevails along the coast of Peru - southeast trade wind. The seawater flows from the shore to the deep ocean, the seawater in the departure area decreases, and the cold seawater at the bottom of the ocean rises to replenish it, which is the upwelling compensation current, bringing a large amount of phosphates and silicates to the surface of the seawater, which becomes food for plankton. Plankton reproduces in large numbers, and plankton is food for fish. Therefore, the upwelling compensation current prevailing along the coast of Peru has formed the Peruvian fishing ground, one of the four largest fishing grounds in the world.

Main seafood:

North Sea fisheries, cod, herring, capelin

Hokkaido fishing grounds: salmon, pollock, Pacific herring, sardine, saury

Canada's Newfoundland Fisheries: Cod

Peruvian Fisheries: Peruvian Anchovy

5. What is the world-famous fishing ground located off the coast of Latin America?

Peruvian fishing grounds, the offshore wind (wind blowing from land to sea) prevails along the coast of Peru - southeast trade winds. Seawater flows from the shore to the deep ocean, the seawater in the departure area decreases, and the cold seawater at the bottom of the ocean rises to replenish it, which is the upwelling compensation current, bringing a large amount of phosphates and silicates to the surface of the seawater, which becomes food for plankton. Plankton reproduces in large numbers, and plankton is the food for fish. Therefore, the upwelling compensation current prevailing along the coast of Peru has formed the Peruvian fishing ground, one of the four major fishing grounds in the world.

In some years, the offshore wind is weak, the cold seawater does not rise much, the seawater temperature is higher than usual, and the fish cannot adapt to the higher water temperature and die in large numbers. This is the El Nino phenomenon.