CATDOLL : CATDOLL: How are silver cod fish farmed? What are the differences between silver cod and cod?

What are the differences between silver cod and cod in terms of farming conditions?

Freshwater silver cod (large scale fat) can generally be farmed in the same way as carp. First, you need to build a pond in a flat area with good natural conditions, no pollution, and sufficient water. After building the pond, you need to check the embankment around the pond to make sure there are no rat holes or side leaks. Before releasing the fish, you need to check the water quality. If it is not suitable for the growth of freshwater silver cod, you need to adjust it immediately.

1. Silver cod breeding conditions

1. Site selection

(1) Freshwater cod (cod) farming can generally be carried out in the same way as carp farming. It is necessary to build a pond in a flat area with good natural conditions, no pollution and sufficient water resources.

(2) There should be no farms or chemical plants around the silver cod ponds.

2. Pond disinfection

(1) After building the pond, you need to check the embankment around the pond to make sure there are no rat holes or side leaks.

(2) Subsequently, the pond needs to be disinfected with lime and a fence needs to be used around the pond to prevent poultry such as ducks and geese from entering the pond.

(3) Once everything is ready, you can pour clean water into the pond. You need to carefully observe the water level. If the water level drops, you need to check whether there are holes in the pond. If there are holes, they need to be repaired in time.

3. Water quality

Before releasing the fish, you need to check the water quality. If it is not suitable for the growth of freshwater silver cod, you need to adjust it immediately.

4. Water temperature

Freshwater silver cod (Ocelotrus sphaerocephalus) can generally survive in temperatures between 1 and 30°C.

5. Select fry and temporarily raise them in cages

(1) When selecting fish fry, you should choose high-quality fish fry that are of the same size and have no obvious differences. And after buying the fish fry, you cannot release them immediately. You need to temporarily raise them in cages or other methods.

(2) When using cages to temporarily raise fish fry, you can first place a small amount of fish fry into the water of the pond for breeding. After waiting for 3-5 days, if there are no abnormalities, you can put the remaining fish fry into the pond.

6. Stocking density

(1) In the early stage, the stocking density of freshwater silver cod was similar to that of carp. Generally, the carp breeding density was about 3,000 kilograms per mu.

(2) In the later stage, the stocking density of silver cod weighing 2 taels is generally 1500-2000 per mu.

7. Feeding

(1) Generally, you do not need to feed the fry within 5 days of stocking them.

(2) The first feeding is required 7-8 days after stocking. In the first 3-5 days of feeding, feed can be placed in every corner of the pond. After the fry adapt to the feed, the feeding range can be reduced until it is reduced to a fixed range.

8. Daily management

The ponds need to be inspected every day, and if sick fish are found, they need to be isolated immediately. However, freshwater silver cod do not have sudden diseases, and no serious cases of illness have been found so far.

2. What is the difference between silver cod and cod?

1. The difference between silver cod and cod

(1) Price: Generally speaking, the price of silver cod is higher than that of ordinary cod.

(2) Meat quality: In terms of texture, silver cod is harder, while cod is softer. In terms of color, silver cod is darker, while cod is lighter.

(3) Taste: After frying, silver cod melts in your mouth, has a delicate texture, and has a unique fragrance and flavor. However, after frying cod, although it has a meaty aroma, it has a greasy taste. In addition, the cod meat is rough and has a poor taste after being cooked.

2. How to choose high-quality silver cod

(1) Appearance: From the appearance point of view, the meat of high-quality silver cod is white in color, without thick and obvious red lines, and has dense fish scales on its body.

(2) Fish skin: After thawing the silver cod, you can touch the fish skin with your hand. If the fish skin is smooth, it is a high-quality silver cod.

(3) Fish scales: When choosing silver cod, you need to choose silver cod that has not had its scales scraped off.

(4) Taste: High-quality silver cod will have a chewy texture after eating.

3. Living habits of freshwater silver cod

(1) Under artificial breeding conditions, freshwater silver cod will live in the middle and lower water layers of the water body. If the water temperature is suitable and the surrounding environment is quiet and undisturbed, they will occasionally float to the surface.

(2) When freshwater cod float to the surface, they gather together and swim around the pond. If there is any other sound at this time, they will sink rapidly and flee.

(3) If the water temperature is above 15°C, freshwater cod will swim to the bottom of the pond and gather in clusters deep at the bottom to hibernate.

(4) Freshwater silver cod has the characteristics of strong adaptability to temperature, strong resistance to stress, and tolerance to low oxygen.

(5) Wild silver cod are omnivorous fish. Under natural conditions, they usually feed on plant debris, benthic animals and small fish and shrimps. Under artificial breeding conditions, their main food is artificial egg yolk paste, soybean milk and plankton such as rotifers, small cladocerans and copepods in the breeding water.

4. Reproductive characteristics of freshwater silver cod

Freshwater silver cod is a migratory fish, also known as reproductive migratory fish. It usually lives in the salty sea waters for fattening and development. When it reaches sexual maturity, it will migrate to rivers to lay eggs.

What are some ways to fish for cod?

Haddock, also known as "North Atlantic cod", belongs to the cod family.

Morphological characteristics: Haddock has many characteristics that help distinguish it from other cod, such as its high, pointed first dorsal fin, black lateral line, and dark "thumb pattern" above the pectoral fin. In addition, the small tentacles on its lower jaw are shorter than those on the upper jaw. They usually gather in large groups, active near the bottom of 40 meters or more, averaging less than 2.27 kg, and generally reaching a maximum of about 6 kg.

Origin: North Atlantic Ocean.

Fishing: Cod can be caught in the ocean by beachcasting from the shore, using natural baits on rocks, piers and breakwaters, or from a boat using natural baits or hair hooks, jigging hooks or eye-catching spoon baits attached to baited hooks. Burbot, a freshwater fish of the cod family, is a slow-moving fish that feeds mainly at night and can be caught in shallow water using a static bottom fishing method.

Fishing tackle: When fishing from shore, try a 12-foot (3.7 m) beach casting rod and a heavy reel, 13.6 kg (15 lb) nylon line, a 2/0 to 8/0 hook, and a bullet-shaped lead weight or bottom-grabbing lead weight. When fishing from a boat, use a 13.6-foot (15 lb) side-by-side fishing rod and a 4/0 to 6/0 heavy reel, 12-lb (3.6 kg) steel leader or nylon line, and a 2/0 to 8/0 hook. When fishing with natural bait and hair hooks, use a bullet-shaped lead weight. When fishing for burbot, try a 12-foot (3 to 3.7 m) bottom-casting rod and a fixed-axis reel, 2.7 kg (15 lb) monofilament line, and a 10 to 14 hook.

Bait: There are many natural baits that work well for marine fish, including many invertebrates such as mussels, sea worms, clams, razor clams, and squid. For baitfish, fish, either filleted or whole, are worth a try, especially oily fish such as herring, mackerel, sprat, and sardines. Among artificial baits, jigs, metal jigs, and plastic sand eels are all effective. A bunch of orange or white feathers on a 5/0 hook is an excellent boat bait. Burbot will take a whole bunch of large worms or small fish.

Haddock is a demersal marine fish found in the North Atlantic Ocean. It is fished commercially for a long time as a large food source. It is easily distinguished by its black lateral line on its white side. It is commonly found at depths of 40 to 200 m, and juveniles prefer shallower waters than adults. They generally live in cold waters near the continental shelf or far from the coast, in waters between 2 and 10 °C (36 °F to 50 °F).

Generally, haddock is not a long-distance bottom-dwelling fish, and regional migrations are uncommon during the year, but short- to medium-distance migrations in search of food do occur. Adults are not as migratory as younger cod, but all cod, young and old, migrate seasonally. The diet of haddock varies with size, season, and region. For example, small fish and shrimp are the main food of young cod, while larger cod will eat other fish, especially in spring and summer. However, in winter, haddock of all sizes generally feed on bottom-dwelling invertebrates such as worms, small mollusks, brittle stars, and sea urchins.

Haddock is a marine fish found on both sides of the North Atlantic Ocean. Haddock is a common food fish, widely fished commercially. Haddock is easily recognized by the black lateral line running along its white side, not to be confused with pollock which has an opposite, white line on the black side and a distinctive dark spot on the pectoral fin.

Haddock is usually found at depths of 40 to 133 meters, but has ranged as deep as 300 meters. It thrives in temperatures of 2° to 10°C (36° to 50°F). Juveniles prefer shallow waters and larger adults deeper waters. Usually, adult haddock do not engage in long migration behavior like fry, but seasonal movements are known to occur across all ages. Haddock feeds primarily on small invertebrates, although larger members of the species may occasionally consume fish.

Haddock growth rates have changed dramatically over the past 30 to 40 years. Currently, growth is rapid, with haddock reaching their adult size earlier than previously noted. However, the extent to which this fry contributes to the reproductive success of the population is unknown.

Haddock is in a biologically dangerous state, and it is necessary to impose a fishing ban on it from 2003. The report suggests that it will take at least 5 to 6 years for cod stocks to recover, and a 12-year fishing ban is necessary for biological reasons. Cod and haddock, the most important commercial species in Europe, are mainly fished in the Baltic Sea and the North Sea. In 2002, the European cod catch quota was 149,000 tons, of which 41,000 tons, or about 25%, were caught in the North Sea; the haddock quota was 107,000 tons, of which 77,000 tons were caught in the North Sea. However, the stock of both fish has dropped sharply. It may take 100,000 tons of spawning resources to restore the healthy reproduction of cod. Therefore, Robin Cook, director of the Scottish Marine Institute, suggested to the European Fisheries Commission that a zero-quota fishing ban be adopted until 2015. All British and Scottish companies that rely on North Sea resources strongly oppose this.