How to remove moss from lobster ponds, aquatic experts?

Common species of mosses in ponds are: Cladosporium (Dictyophora. ), Spirogyra. Enteromorpha hirsuta , reef membrane, Ulva, "mud skin" and so on. Among them, Cladosporium, Spirogyra and brown algae are harmful and difficult to remove when they grow vigorously.

First, the harm of moss

1. 1 leads to thin and transparent water quality.

The proliferation of moss will madly absorb nutrients needed by aquatic plants such as inorganic salts in water, making various beneficial algae, such as diatoms and green algae, unable to grow and reproduce in large quantities due to lack of nutrients. The lack of algae not only leads to the increase of water transparency, but also leads to the insufficient supply of bait organisms such as diatoms, which leads to the slow growth of sea cucumbers.

1.2 is easy to cause water hypoxia and sea cucumber stress.

After a large number of mosses are propagated, due to its huge biomass, although a large amount of oxygen is produced during the day, a large amount of dissolved oxygen is consumed at night; Moss consumes a lot of oxygen in the process of death and decay; Harmful substances produced by moss decay stimulate the stress of sea cucumber; These phenomena can easily lead to water hypoxia and sea cucumber stress, especially when the weather changes and it rains continuously.

1.3 hinder the movement of sea cucumber.

The filamentous structure of moss often traps the sea cucumber, which seriously affects the movement and feeding of the sea cucumber, and even breaks the sea cucumber in serious cases, causing serious harm.

2. A method for removing moss from sea cucumber ponds

In the process of breeding, farmers have accumulated some methods to remove moss, and each method has its own characteristics, mainly including:

2. 1 artificial fishing

This method is a relatively quick method, which can quickly remove bryophytes growing in the pond. The disadvantages are obvious: ① A large number of sea cucumbers will be fished out together. Artificial fishing will take out the sea cucumber together. If the operators were more diligent, these sea cucumbers might still be alive; Failure to work hard will bring great losses; ② The problem of moss cannot be fundamentally solved. In the process of fishing, a lot of torn moss often remains in the water. Because of its strong viability, it will multiply in large numbers after a period of time. (3) In this case, if fertilization is carried out immediately, the resurrection speed of moss will often be accelerated; This method will consume a lot of manpower, material resources and financial resources, but it may not get good results.

2.2 Use herbicides, such as prometryne.

Some farmers like to use this method to remove moss, and have achieved certain results. Pesticide herbicides are generally used to remove broad-leaved weeds in the field and are specially developed for farmland plants or lawns. At the beginning of development, it will not be considered to be used in the sea cucumber pond in the future, which will bring congenital deficiency.

When it is used in aquaculture ponds, because it has not been treated by special technology, it often retains strong irritation, which will bring serious irritation to beneficial algae and cultured organisms (such as sea cucumbers) in water, especially if the dose is not carefully controlled, the consequences will be more serious, such as most sea cucumbers will stop eating.

2.3 Use special moss cleaning agent for aquatic products.

This is also an ideal method to kill mosses so far, which not only reduces the toxicity and irritation of mosses, but also can kill mosses efficiently with obvious effect.

Three. Common precautions of moss cleaning products

Moss cleaning products are easy to damage water bodies, especially algae, water quality and sediments, so be careful when using moss cleaning products. Attention should be paid to during use:

① The timing of moss removal should be sooner rather than later. It is best to kill the moss when it first appears in spring. At this time, the effect of clearing the moss is the most obvious, and the dosage is less, which saves the cost of medication.

② Choose a sunny time. Because most products for cleaning moss are absorbed by the roots or leaves of moss, which affects photosynthesis and achieves the purpose of killing moss. Therefore, the process of cleaning moss must be carried out when there is plenty of sunshine, and it must be dried for 3 ~ 5 days after use. At the same time, try not to drain water and change water during this period, so that the moss-clearing drugs can give full play.

(3) several times. When there is a large amount of moss in the pond, the principle of killing moss should be followed, and each use should not exceed 1/3 of the water surface, and attention should be paid to increasing oxygen in time according to the situation.

(4) After killing the moss, change the bottom and apply fertilizer in time. No matter in the spring and autumn when the temperature is low or in the summer when the temperature is high, after the moss is removed (usually 3-7 days, the moss has turned yellow and died), bottom decoration and watering and fertilization should be carried out.

The purpose of bottom modification is to decompose dead moss and prevent the bottom material from deteriorating and stinking. At this time, the bottom modified products should choose chemical oxidation products or biological live bacteria products to avoid physical adsorption products.

The purpose of fertilizing water is to make phytoplankton grow rapidly in water, provide sufficient dissolved oxygen for water, reduce transparency and prevent moss from resurrecting again. Fertilizer and water products containing algae should be selected.

⑤ In order to reduce the toxic stimulation of moss-clearing drugs on sea cucumber, after the effect of moss-clearing drugs is achieved, the sea cucumber should be detoxified with detoxification drugs to reduce the stress response of sea cucumber.

⑥ Moss that has been fished out or died shall not be fed to animals.

Four. Suitable products

"Double killing algae" is a more suitable product. Features: effectively remove moss, silk moss, mud skin, cladosporium, filamentous grass (appropriate amount), Enteromorpha, etc. It has little irritation to sea cucumber. By diluting with water or sprinkling with sand, moss can be fully absorbed, and the effect of killing floating moss and pool bottom is obvious.

For more professional aquaculture technology, please refer to the column of aquaculture technology/Ji Shu /list/3/