CATDOLL : CATDOLL: Profits and risks of fish farming

1. Profits and Cost Risks of Fish Farming

The profit and cost risks of fish farming are as follows: Profit: 50 mu of ponds raising four major carps can bring in about 2 million yuan in profit a year, and raising mullets can also bring in about 800,000 yuan in profit. Cost risk: If there is disease in the fish pond, or if the fish are not suitable for breeding, then the work for the year will be in vain.

2. How many fish can be raised in 1 mu of fish pond?

1. Do not exceed 850 fish. If you release a lot of fish, you must have oxygenation equipment.

2. Suppose there is a one-acre fish pond, covering an area of ​​667 square meters and a water depth of three meters. Crucian carp is the main fish, and you want to add some grass carp. You can adopt the following breeding structure: release 400 crucian carp (50 grams), 80 grass carp (about 300 grams), 100 silver carp, 50 bighead carp (bighead carp), and then add some other fish.

3. Ways to reduce the cost of fish pond farming. Breeding fish by yourself: Breeding fish by yourself can reduce expenses by about 50%, and the fish you breed by yourself are healthy, disease-resistant, and have a high survival rate; Reasonable stocking: Reasonable stocking should be carried out according to the feeding habits of fish and the conditions of the pond, both edible fish and fat fish should be stocked; Planting green fodder; Raising fish with chemical fertilizers: The placement and application of chemical fertilizers can quickly increase the number of plankton in the pond, and is also a major measure to save the cost of fish farming; Light-induced insects: Using the phototaxis of insects to introduce insects into the pond can also save feed.

3. How much does it cost to raise 100 mu of fish pond?

If it is fed with feed, one ton will cost about 4,000 yuan. If calculated based on a one-year cycle, it is estimated to be around 800,000 yuan.

Living habits

sports

It mainly relies on the alternating contraction of the muscles arranged on both sides of the body to make the body and tail move.

The fins move forward by swinging left and right, and the other fins play a role in balance and steering. After metamorphosis, the fins of some fish also have the functions of attacking, self-defense, feeding, reproduction, vocalization, crawling, gliding, jumping, climbing, breathing, etc.

Food intake and digestion

Fish feeding habits are usually divided into four types: filter feeding, herbivorous, carnivorous, and omnivorous. The digestive organs of fish are divided into the mouth, oropharyngeal cavity, esophagus, bones, intestines, rectum, anus, etc. The digestion of fish food is related to the contraction movement of the gastrointestinal tract, and is also affected by external factors such as water temperature, dissolved oxygen content, food intake, and the physical and chemical properties of food.

breathe

In addition to breathing with gills, fish also have auxiliary breathing methods, such as intestinal breathing, skin breathing, oral breathing, gill fold breathing, swim bladder breathing, etc. Fish have two nostrils, but no oral cavity (except for the lungfish and crossfin subclasses).

Blood circulation

The blood circulation of fish is a non-mixed circulation, a single circulation. The blood in the arterial pulse has a higher oxygen content and the circulation efficiency is higher than that of the mixed circulation.

Excretion osmoregulation

The main excretory organ of fish is the mesonephros, which is composed of many renal tubules connected to the renal corpuscle.

Metabolic waste is filtered through the renal capsule and then excreted from the body through the mesonephric duct. The excretion of metabolic products in fish is completed by the kidneys and gills.

Circular Breathing

The heart of fish is generally composed of venous sinuses, auricles, ventricles, and arterial cones. Blood enters the gill area from the heart through the ventral aorta. After gas exchange, the blood leaves the gill area and branches to supply blood to tissues throughout the body. Blood from the whole body returns to the heart through the venous system. The gills are respiratory organs unique to fish. The respiratory surface of the gills is the gill lamella, which has a large area.

Reproduction method

Fish are generally dioecious, and their gonads are usually in pairs. Cartilaginous fish are generally fertilized internally, and are ovoviviparous, viviparous, or oviparous, while most bony fish are fertilized externally. The eggs laid by freshwater fish are sinking or floating, while those laid by marine fish are all floating. The sexual maturity of fish is closely related to species, nutrition, water temperature, light, etc., and is regulated by gonadotropin. The fertilized eggs hatch after a certain period of time, and the fry shed their membranes. The life of a fish is divided into the embryonic stage, fry stage, immature stage, and adult stage. Among them, the mortality rate in the fry stage is the highest.

There are four ways of fertilization and development of fish: ① In vitro fertilization and development outside the body. ② In vitro fertilization and development inside the body. ③ In vivo fertilization and development outside the body. Before the eggs are laid, the male fish uses special mating organs, such as fins and short tubes, to make the semen flow into the reproductive pores of the female fish. Soon after the eggs are fertilized inside the body, they mature and are discharged outside the body for development. ④ In vivo fertilization and development inside the body.

4. Cost of digging a fish pond

Haha, of course they make money. Digging a 30-acre pond (660 square meters * 30 acres * 1.5 depth) is nearly 30,000 cubic meters. The soil used for highways is generally more than 30 yuan per cubic meter, which is about 1 million yuan. The cost of digging a 30,000-cubic-meter pond is only about 100,000 yuan, plus the transportation cost, it is 200,000 yuan, and it is only 300,000 yuan in total. All B teams earn at least 700,000 yuan (hope you adopt it)