How to measure the water quality of fish farming How to regulate the water quality of fish farming?

Clarified water is produced by the natural "nitrification" of water. For example, the water of the stream is very clear. Without further ado, let's tell you the method directly. Don't give medicine to the fish easily, the color of the methyl blue makes the water clear and it is a false impression for you.

Method 1, do not change the water, do not catch fish, please use water purification agent (gold drop brand can), filter material with filter cotton, according to the size of the fish tank to add an appropriate amount of water purification agent, filter out the water magazine, clean the filter cotton every 10 minutes, until the flocculent of the water purification agent is all filtered out. At this time, there are no bacteria in the clear water, but such water does not remain clear. Please replace the filter material, re-lay 3 layers (3 layers from bottom to top are biochemical rings, biochemical cotton, filter cotton), put a little nitrifying bacteria on the biochemical cotton, continue to filter, a week later, the water nitrification system can be established, reduce feeding during the period, do not clean the filter material.

And don't clean the next two layers of filter media until a long time, you can only regularly clean the best filter cotton, if there is a fishy smell for a long time, please add activated carbon under the filter cotton to solve the problem.

Visit France 2, change the water, catch fish, and redo the water. Re-making water is the same as method 1, that is, do not add water purification agent (water purification agent is actually aluminum oxide, which is not good for fish, but it is not very harmful to fish, and you should be cautious every time you use it), and you can put it into your favorite fish after making water for a week.

An important condition for keeping the water clear is to "eat smaller, more frequent meals", i.e. feed less at a time, but several times a day (it is recommended to feed more than 4 times a day).

Fish Farming Notes Season 2 Episode 05: How to regulate the water quality of the fish tank in fish farming, the most important thing is to reduce the burden.

Ornamental fish with the temperature gradually rises, the summer fish need to be most concerned about the water temperature, if you do not pay attention to the change of water temperature at this time, it is likely to cause changes in water quality, at this time it is more likely to appear ornamental fish diseases. So how to regulate the water quality of fish farming in summer?

1. Regularly fill with new water:Generally, add water or change water once every 7-10 days. Pay attention to observation at ordinary times, and take appropriate adjustment measures to add and change water in time according to the water quality to ensure that the pond water is suitable for the growth of fish.

2. Aerator oxygenation.

Intensive culture pond should be installed in the summer, in the sunny day at noon 2-3 o'clock to open the aerator to adjust the water quality, when there is a floating head danger, open the aerator to increase the aerator.

3. Other methods.

In summer, other auxiliary methods are used to regulate water quality, such as regularly agitating the bottom of the pond to promote the circulation and metabolism of substances; Timely removal of dirt and bait to prevent pollution, timely killing of Daphnia and other drug adjustment methods.

4. Prevent fish diseases.

Summer is also the season when fish diseases are prone to occur, and the prevention and control of fish diseases should be done. The food field and bait table are cleaned every 10 days, and then each food field is splashed with 250g of bleaching powder or quicklime, which is dissolved in water and splashed, and generally can be splashed once every 15 days in the whole pool, so that the bleaching powder in the water reaches 1mg kg or the quicklime is splashed up to 20mg kg to prevent and treat diseases. You should also pay attention to observation.

If fish diseases are found, effective measures should be taken in a timely manner**.

As the saying goes, "fish farming starts with water transfer", which shows the importance of water transfer to aquaculture. With the rapid development of science and technology, water transfer technology has also made great progress, which can be summarized in the following three aspects.

1. Physical water transfer.

Add and change the water. Adding water is the simplest water transfer measure, but adding water also has its limitations, one is that some breeding areas have inconvenient water sources, and there is no water to add; Second, the addition and replacement of water will flow out a lot of bait organisms, so that the water quality is light, which is not conducive to the growth of filter-feeding fish, and the water quality is too light and also reduces the amount of photosynthetic oxygenation; Third, adding and changing the water is easy to cause the stress reaction of fish and shrimp. Therefore, in the process of intensive culture, if it is not necessary (pollution exceeds self-cleaning capacity), water replacement is generally not used as a water diversion measure.

2.Mechanical oxygenation. Dissolved oxygen index is the most important factor in fish and shrimp intensive culture, in addition to algae oxygenation, mechanical aeration is the main oxygen source guarantee for fish and shrimp farming, with the continuous improvement of intensification, the role of aerator is more and more important.

The effect of mechanical oxygenation can be summarized in four aspects: (1) increasing dissolved oxygen in water; (2) reduce water stratification and promote the uniform distribution of dissolved oxygen; (3) Promote the oxidation reaction of the substrate, eliminate or reduce the formation of "oxygen debt" and harmful compounds; (4) Accelerate the oxidative decomposition of organic matter such as residues and feces, and promote the circulation of water materials and energy flow.

2. Chemical water transfer.

Chemical water transfer technology is to use some characteristics of chemical substances, according to specific water quality characteristics and improvement requirements, to sedimentation, oxidation, decomposition, ion exchange and other effects on the harmful substances of the aquaculture water, so that the water quality can be purified. Chemical water regulators include oxygen enhancers, such as calcium peroxide and hydrogen peroxide; flocculants (sedimentants), such as alum, etc.; ion exchangers, such as quicklime, sodium thiosulfate; pH regulators such as acetic acid, quicklime, sodium bicarbonate; algaecides, such as copper sulfate, etc.; Directional algae culture, etc. Chemical water blending agents are characterized by fast effect and easy to use, but the disadvantages are short timeliness, high cost, and cannot solve the fundamental problem.

3. Water diversion of biological agents.

This is the most common method of water transfer used today. Many farmers will rely on the "Youjiling" small peptide preparation for water transfer work, it has detoxification, anti-stress, culture and algae and other multiple effects, especially now in the middle of summer, reasonable use will have more satisfactory results.

The hardness in water usually refers to the amount of compounds such as calcium and magnesium dissolved in the water. The higher its content, the greater the hardness of the water. Water with high hardness is called "hard water", and water with low hardness is called "soft water".

There are a variety of hardness expressions, at present, the most commonly used in the aquarium industry is the German hardness notation, that is, the equivalent of calcium chloride to express all soluble calcium and magnesium salts in water quality. A German hardness equivalent to 1 milligram equivalent of calcium chloride per 100 ml of water is labeled as 1 degree GH. Water with a hardness of less than 8 degrees GH is called "soft water", which is more suitable for the cultivation of general aquatic plants and fish.

Water with a hardness higher than 8 degrees GH is called "hard water", which is not suitable for the cultivation of aquatic plants and fish, and it is necessary to try to reduce the hardness in the water quality.

However, it is not that the water quality with lower hardness is better, and it is not suitable for aquatic weeds and fish farming, because the content of calcium, magnesium and other compounds in the water quality is too small, especially for aquatic grass cultivation, which is not conducive to the vegetative growth of organisms. If we want to grow aquatic weeds and raise fish in this "soft water" environment, we have to find ways to improve the hardness of the water quality, which we call "hardening" of the water quality. Therefore, before being used as a water source for cultivation and breeding, it is best for us to confirm the hardness of the water quality with the test agent of the aquarium market, and if the water hardness is found to be unsuitable, it can be adjusted with the relevant treatment agent to convert to the best water quality suitable for biological growth.

In general, we can use the following methods to adjust the hardness of water quality. When the water hardness is too high, the adjustment methods that can be used are: 1

Use a water softener to adjust, e.g. add the right amount of hardness reducer. 2.

Pre-filtration with cation exchange resin thoroughly softens the water hardness. 3.Partially change the water, add low hardness water or mix with pure water.

When the water hardness is too low, the adjustment methods that can be used are: 1Use hard water potions to adjust, such as:

Add an appropriate amount of hardness enhancer. 2.Add some coral sand or marble sand to the aquarium to increase the hardness of the water, but at the same time, you need to pay attention to the change in the pH content of the water.

3.Partially change the water and add high hardness water to mix.

The water for fish farming needs to be fertilized and tender, and the water quality should be fertile, and you can use Chinese animal chlorella to cultivate algae and increase nutrients and high-quality algae in the water.

Summary. You can raise ordinary fish with tap water. However, tap water that has not been treated cannot be used.

Before using tap water, it is necessary to dechlorinate and disinfect the tap water. And it is necessary to cultivate the nitrifying bacteria system in water. The water used for fish farming needs to be clean, with sufficient dissolved oxygen, and ensure that the water quality conditions, such as water hardness, pH, etc., are suitable for the fish to be raised.

When raising some fish with high water quality requirements, it is necessary to prepare special water suitable for them.

You can raise ordinary fish with tap water. However, tap water that has not been treated cannot be used. Before using tap water, it is necessary to dechlorinate and disinfect the tap water.

And it is necessary to cultivate the nitrifying bacteria system in water. The water used for fish farming needs to be clean, with sufficient dissolved oxygen, and ensure that the water quality conditions, such as water hardness, pH, etc., are suitable for the fish to be raised. When raising some fish with high water quality requirements, it is necessary to prepare special water suitable for them.

Before using tap water, the water needs to be treated in a series of ways. 1. Chlorine removal: There is still some chlorine in tap water, which has an adverse effect on the growth of fish.

Therefore, before using tap water, it is necessary to let the tap water stand or expose to the sun for 1 2 days to remove chlorine. 2. Disinfection: Direct sunlight can effectively disinfect.

You can also put a little salt into the water, which can also play a role in sterilization and disinfection. 3. Nitrifying bacteria system culture: fish will produce a lot of feces.

Feces can be converted into toxic substances that affect their health. Therefore, before raising them, it is necessary to cultivate a nitrifying bacteria system in water. That is, nitrifying bacteria are added to the water.

This nitrifying bacterium is able to effectively dispose of manure. 4. Clean water quality: Fish farming also needs to ensure that the water is clean.

Therefore, it is necessary to pay attention to changing the water when breeding, and it is best to install a filter in the tank. 5. Oxygen: Fish need oxygen to grow.

Therefore, the water in which they are kept needs to have a certain oxygen content. In addition, the pH and hardness of the water should be adjusted appropriately according to the habits of the fish being raised. The best water is the right one for them.

Fish can be raised with cool boiled water. Cool boiled water is more suitable for raising some fish who don't like hard water. Because the hardness of cool boiled water is relatively low.

However, there is a disadvantage of using cold boiled water to raise fish, that is, the oxygen content of the boiled water is very low. Therefore, if you want to raise fish in cool boiled water, it is best to first use an oxygen pump to inject a sufficient amount of oxygen into the water.

Fish water generally pays attention to water temperature and dissolved oxygen in order to maintain good water quality.

1. Water temperature:

As ectothermic animals, fish have relatively high requirements for temperature, usually to keep the temperature constant, and the temperature difference between day and night is best less than 2. If it is a tropical fish, there are certain requirements for low temperature, the minimum temperature can not be lower than 20, preferably around 22-24.

2. Dissolved oxygen:

Since fish need to breathe in water, the level of dissolved oxygen is also crucial, so that it can be used to facilitate respiration, as well as to promote the establishment of the digestive system. Usually an oxygen pump is used for oxygenation, but if the fish tank is relatively small and the fish do not have a high demand for oxygen, they can also use water exchange to supplement oxygen.

Precautions are required for water raising:

1. pH of water:

The origin of various tropical fish varies depending on the water quality they prefer. Generally speaking, the various ornamental fish produced in South America prefer acidic water, the tropical fish produced in Africa prefer alkaline water, and the tropical fish in Southeast Asia are suitable for neutral water quality. In general, alkaline water fish and neutral water fish can survive and grow in weakly acidic water quality stockings, but it is difficult for fish in acidic water to survive in alkaline water.

But this is not absolute.

2. Hardness and softness of water:

The hardness of the water depends on the content of calcium and magnesium ions in the water. The water quality in the south is softer and the water in the north is harder, but it is basically within the tolerance range of tropical fish. In some areas, groundwater is used as a water source, and the water quality is extremely hard, which is not suitable for feeding tropical fish.

The methods for raising fish water to maintain good water quality are as follows:

1. Wash the cylinder and disinfect it.

Before raising fish, the newly bought fish tank should be cleaned and disinfected, washed with clean water, and then fully disinfected with potassium permanganate. If there are decorations such as sunken wood and stones, they also need to be cleaned and disinfected.

2. Add water to remove chlorine.

After cleaning the fish tank, we add tap water to the fish tank, because the tap water contains a lot of chlorine, so we have to let it sit for a few days. In this way, the chlorine in the water can be volatilized, and the filtration system, heating system and other equipment can be equipped.

3. Nitrification and water cultivation.

In order to make the water quality more suitable for fish farming, nitrifying bacteria can be added to the fish tank, and the water in the fish tank may become mixed at first. You can put an appropriate amount of rain master in it, and turn on the circulating filtration, after which the water will slowly become clear. It usually takes three to five days, after which the water is almost ready.

4. Put the fish in the tank.

After the water is raised, don't be in a hurry to put the fish in it, it is best to put a few fish in the tank first. See if the ecology of the fish tank is suitable for the survival of the fish, and if the tank is successful, then put the fish in to raise.

Tips for buying fish

1. Look at the shape of the fish.

The appearance of fresh fish is intact, the body is normal, the color is bright, some fish will have a curved spine or even deformity, the skin color is gray and the fish is not fresh; Fresh fish have transparent mucus on the surface, and the scales are shiny and not easy to get rid of, while fish that have been stored for a long time have more and thicker mucus on the surface, and the scales are not shiny and loose, and they smell very strong.

2. Look at the fish's eyes.

Fresh fish eyes are very bright, slightly protruding, and there is no obstruction on the surface of the fish's eyes; If the eyes of the fish are not fresh, the surface is gray and dull, and in severe cases, the eyeballs will be blurred, and they will no longer bulge, but they will be in a sunken state. There will be bruising in the eyes, these are stale fish, so it is not recommended to buy them.