CATDOLL : CATDOLL: How much does it cost to raise fish in cages?

How much does it cost to farm fish in cages?

A section of water in Yingshang area of ​​Yinghe River is rented for raising silver carp with 500 6X4 floating cages. The investment in the cages is 150,000 yuan. Each box contains 150 1-jin white carp fry. The current market price is 3 yuan per jin.

1. Cage fish farming is a high-density aquaculture, so the cost and profit of cage fish farming are the most concerned issues for the majority of fish farmers. And calculating the cost of fish farming cages is one of the costs of cage fish farming. Therefore, the cost and profit of cage fish farming generally include: the price of cages, the price of fry, the labor cost, the loss of fish farming equipment, the cost of feed, the cost of fish farming drugs, etc.

2. The species that can be raised in cage fish farming generally include: tilapia, yellow eel, loach, eel, black fish, sea bass, rainbow trout, yellow catfish, carp, grass carp, crucian carp, silver carp, bighead carp, whitefish, grouper, black carp, bream, catfish, t fish, sturgeon, pike, dace, live mandarin fish, sweet-scented fish, native catfish, mackerel, mullet, rosy fish, tiger grouper, blue grouper, etc.

What size cages are there? Floating or fixed with piles?

What fish to raise! What size fish

Give you a reference.

I rented a section of water in Yingshang area of ​​Yinghe River with 500 6X4 floating boxes for silver carp

The investment in the cage is 150,000

Each box contains 150 1-jin white lotus fry, and the current market price is 3 yuan per jin

The river lease is 20,000 yuan a year

Hope this helps

How big a net cage is needed to hold 2,000 kilograms of fish?

19 acres of water surface used as floating cages to raise tilapia

Can anyone tell me how to raise trout?

Good water quality is very important for breeding trout, and high-quality running water is required. Basic conditions required for breeding rainbow trout 1. Water conditions for breeding trout Rainbow trout is a cold-water fish. Under natural conditions, it lives in rivers and streams with fresh water quality and unpolluted gravel bottom. Lake-type rainbow trout mostly live in relatively deep cold water or coastal waters; sea-going rainbow trout are usually divided into two groups: winter sea-going and summer sea-going. Rainbow trout have certain requirements for water temperature, dissolved oxygen, water flow, pH value, hardness, salinity, etc. (1) Water temperature: The water temperature for rainbow trout to survive can range from 1 to 25°C. Under artificial breeding conditions, the water temperature for growth is between 7 and 22°C, the suitable water temperature for hatching is 8 to 11°C, the suitable water temperature for seedling cultivation is 9 to 15°C, and the suitable water temperature for adult fish breeding is 14 to 18°C. At suitable water temperatures, the fish eat vigorously, grow rapidly, and the body can maintain a good metabolic state. When the water temperature is lower or higher than the suitable water temperature, the fish's appetite decreases and its growth is hindered. When the water temperature reaches 24℃, they stop eating. When it reaches 25℃, they become abnormal and even die. This is generally called the critical value. Under the same breeding conditions, when the water temperature is 12-14℃, the fish can grow to 100-250 grams in the first year, 500-1000 grams in two years, and 1000-2000 grams in three years. When the water temperature is 8-10℃, the fish can grow to 30-50 grams in the first year, 300-600 grams in two years, and 800-1000 grams in three years. When the water temperature is 14-18℃, 50-100 grams of fingerlings are released, and after 6 months of breeding, the fish can reach 600-900 grams. (2) Dissolved oxygen: Rainbow trout like to swim upstream and live in groups in places with sufficient dissolved oxygen. Rainbow trout consume a lot of oxygen, so sufficient dissolved oxygen is more important for rainbow trout than other freshwater fish. The dissolved oxygen requirement in the water for trout farming is above 6 mg/L. The fastest growth is when the dissolved oxygen is above 9 mg/L. When it is below 5 mg/L, the fish's breathing rate increases and they feel uncomfortable. When the dissolved oxygen is 4 mg/L, the fish gather at the water inlet for a long time. The top of the fish's head turns yellow and the gill cover opens outward. These can be identified as floating head phenomenon. At the same time, the fish will die. When the dissolved oxygen is 3 mg/L, the fish will die in large numbers. Therefore, this point is the lethal point during the growth period of rainbow trout. The embryonic development of rainbow trout eggs is also closely related to the dissolved oxygen in the water. When the dissolved oxygen content is high, the embryonic development and yolk absorption rate are accelerated, while the development rate slows down in a low oxygen environment and the deformity rate of hatched fry increases. (3) Water flow: The artificial breeding method of rainbow trout is different from that of other freshwater farmed fish. Except for large water surface and cage breeding, all other breeding methods adopt flowing water. The appropriate flow rate of trout pond water is 12-18 m/min, and the size of the fish stocked varies. Due to the stimulation of water flow, the normal movement of rainbow trout is induced, thereby accelerating the metabolism of substances in the fish body and increasing appetite. Water flow can also prolong the floating time of bait in the water, which is beneficial for trout predation. At the same time, water flow can also wash away waste in the water. The more important role is to continuously transport fresh oxygen-rich water through water flow and exchange to meet the fish's demand for oxygen. Water flow has the effect of stimulating the development of gonads for broodstock. (4) pH value: Rainbow trout can survive in waters with a pH of 5.5-9.2. In artificial breeding environments, the more suitable range is neutral or slightly acidic waters between 6.5 and 6.8. (5) Salinity: Rainbow trout can adapt to a wide range of salinity, that is, they can live in fresh water and seawater. The rainbow trout we currently raise are landlocked and live in fresh water all their lives. If they want to be raised in seawater, they need a transition (acclimatization) period from fresh water to seawater. Gradually transition from low concentration to high concentration. For example, fish weighing more than 25 grams can adapt to the seawater environment after living in brackish water for about 20 days. The adaptability of rainbow trout to salinity increases with the growth of the individual. Under normal circumstances, juvenile fish can adapt to a concentration of 5-8‰, annual fish to a concentration of 12-14‰, one-year-old fish to a concentration of 20-25‰, and adult fish to a concentration of 30‰. (6) Water source: The water sources for trout farming can be summarized as follows: a. Spring water is currently the preferred water source for trout farming. Because spring water is clear and clean, pollution-free, warm in winter and cool in summer, and has a small temperature difference every year. This water can be used for the farming of adult fish and seedlings, as well as artificial breeding and hatching. It is the most ideal water source for trout farming. b. Groundwater: Groundwater is also a good water source for trout farming. It has a constant water temperature, few suspended solids, and relatively stable water quality, but the dissolved oxygen content in the water is low. When using groundwater, it must be aerated. Increasing the dissolved oxygen content in the water emits harmful gases such as nitrogen. Using groundwater to raise fish requires mechanical equipment to extract water, which increases production costs. c. Using reservoirs or lakes to raise trout in cages, or using reservoir bottom drainage to raise trout in flowing pools. Generally, the water temperature of reservoir bottom drainage is suitable for trout survival. Especially cold oligotrophic reservoirs can be considered for breeding. At present, Guanmenshan Reservoir and Guanyin Pavilion Reservoir in our city have had successful experience. When using reservoir bottom drainage to raise trout, wild fish should be prevented from mixing in. Pathogens in the reservoir are often brought into the trout pond, and fish disease prevention and control work needs to be strengthened. d. Using river water to raise trout: River water in colder areas usually has a lower water temperature. The river water in Benxi area will have a high temperature period of more than one month in summer, and some areas do not exceed the limit. It can be used as aquaculture water. The use of river water to raise trout is limited to the breeding of adult fish, and the effect is better, because the water temperature is between 12-25℃ for about three months. The fish grows fast. However, it should be noted that: first, the water temperature is uneven, and the danger of high temperature period should be prevented; second, the water quality is easily affected by the outside world and changes. The inflow of pesticides, dirt, etc. can easily cause fish diseases; third, the river water cannot be used to raise fish during the winter ice period. 2. Conditions of the breeding pond Trout breeding ponds are divided into hatching ponds, juvenile fish breeding ponds, adult fish ponds, and parent fish breeding ponds. The shapes of fish ponds are rectangular, circular, irregular, etc., and the construction of ponds can be determined according to the specifications of fish farming and the terrain. No matter what kind of fish pond is built, it must ensure that the water flow is smooth, easy to exchange, convenient to discharge sewage, no dead corners, easy to manage, easy to catch, and improve the utilization rate of water bodies. At present, most of the commonly used trout ponds are rectangular ponds. The fish pond structure includes concrete structure, brick and wood structure and earth pond. Standard trout ponds are preferably made of brick, stone or concrete structure, which can be determined according to the difficulty of the source of building materials. (1) Specifications of rearing ponds a. Hatching pond: refers to the fish pond from the time when the fry hatch from the eyed eggs to the time when they start to feed. The specifications of the fish pond at this time are relatively small, generally each pond is 1-3 square meters, the width is 0.4-1 meter, the length is 2-3 meters, the depth is 30-50 centimeters, and the water depth is 10-30 centimeters. b. Juvenile fish pond: area is 30-90 square meters, the width is 1.2-1.5 meters, the length is 8-20 meters, the depth is 40-60 centimeters, the water depth is 20-40 centimeters, and the bottom gradient is 0.2%. c. Adult fish pond: area is 100-200 square meters, the width is 4-6 meters, the length is 20-40 meters, the depth is 40-60 centimeters, the water depth is 60-80 centimeters, and the bottom gradient is 0.8%. d. Fish pond: area 150-350 square meters, depth 1-1.2 meters, water depth 0.8-1 meter, width 4-6 meters, length 30-60 meters, bottom gradient 1.0%. (2) Arrangement and water flow pattern of rearing ponds The construction of rearing ponds should consider the overall layout according to water flow, topography and production plan. Since juvenile fish are relatively young and have poor disease resistance, juvenile fish ponds should be located near the water source. There are two types of fish ponds: series and parallel. The method to be adopted should be determined according to the annual changes in water volume and topography. If the water volume is sufficient, the parallel type is the best. However, due to water supply and topography, the arrangement of fish ponds in various trout farms adopts a combination of series and parallel layout. Generally, the number of series ponds should not exceed three. If there are too many fish ponds in series, the water quality of the rear ponds will be polluted and deteriorate, affecting the fish farming effect. There are four types of water flow patterns: one is that water flows through each pond through the first row of ponds. The second method is to have a canal at the connection between the second row of pools or the third row of pools, and the fresh water and the drainage from the front pool are mixed and flow into the next row of pools. The third method is to have an inlet canal at the head of each row of pools, which is both the drainage canal for the previous row and the injection canal for the next row. The fourth method is the single row and single injection method, that is, each pool has its own water inlet, and the discharged water is no longer used, and the wastewater is discharged through the underground canal. This method has the best fish farming effect, but it requires sufficient water. (3) The drainage and injection system of the breeding pond. All fish ponds used for trout farming must have water injection ports, drainage ports, gates, escape prevention fences, sewage tanks and other conditions. The water injection port must be a certain distance above the water surface of the fish pond so that water can be smoothly injected into the fish pond, and there must be a certain drop to allow water to fall into the fish pond. The width of the water injection port depends on the width of the fish pond, and is generally one-quarter to one-third of the fish pond. Generally, an escape prevention net should be placed in front of the water injection port to block dirt and wild fish from entering the fish pond and prevent fish from escaping. There are two types of drainage outlets: upper drainage and bottom drainage, and they also have the function of sewage discharge. Farms with conditions also have special sewage gates. The size of the drainage outlet should match the size of the water inlet. It can ensure the exchange of pond water and facilitate the discharge of waste such as leftover bait and feces. It is usually designed in three layers. The first layer is a fish screen (iron screen, plastic plate, perforated, fish net). The second layer is a water retaining gate to make the pond water flow out from the bottom. The third layer is a water level control gate. Practice has proved that this method is easy to popularize. The effect is also good. If conditions permit, each pool is single-row and single-irrigation, a fish screen is set up in the drainage part, and a drainage gate is set up in the lower part. Water and sewage are discharged from the underground culvert. This method has the best sewage discharge effect. But when it is necessary to build, leave a drainage channel and sufficient water. (4) Anti-escape Trout ponds must be equipped with anti-escape facilities. Anti-escape nets are usually made of metal, polyethylene nets or fish fences welded from steel bars. The size of the holes should be determined according to the size of the fish. Under the premise of preventing fish from escaping, the holes should be as large as possible to facilitate the smooth flow of water. For adult fish ponds, 8-12 mm steel bars can be welded. It should be noted that the fish fence must be installed tightly. Especially for juvenile fish ponds, the bottom and both sides of the gate should be tightly packed with foam or soft cloth to prevent juvenile fish from escaping through the gaps. 3. Other conditions In addition to water and breeding pond conditions, rainbow trout farms should also have feed warehouses. If feed needs to be processed by themselves, feed processing machinery should also be equipped. External conditions should take into account convenient transportation, power supply, sufficient site for construction, construction costs, etc. For the sake of grasping, new farms should be scientifically demonstrated. First, the annual changes in water, the annual minimum and maximum flow, water quality, and whether the conditions for trout farming are met should be understood. Second, whether there are pollution sources upstream. Whether it has an impact on trout farming. When building a factory near a river, you need to consider the threat of floods. Is it necessary to build flood control facilities? Determine the production capacity through investigation and demonstration. Then build the factory.