In aquaculture, the choice of fish fry is a crucial part. High-quality fry can not only improve the survival rate, but also bring higher yield and better economic benefits.
So, how to scientifically and effectively select fish fry? Today, we will discuss in depth what points farmers should pay attention to when selecting fry, including how to choose fry suppliers, how to observe the situation of fry, and how to transport fry, from these three aspects for detailed analysis.
First, carefully select suppliers: both reputation and quality
1. Preliminary inspection of supplier qualification
First of all, check whether the supplier's business license, production license and other relevant documents are complete to ensure its legal and compliant operation. At the same time, you can understand the reputation and credibility of suppliers through industry forums, other farmers' recommendations and other ways.
2. Site inspection to understand the production environment
Personally visit the supplier's production site. Observe whether the water source is clean, whether the breeding facilities are perfect, and whether the sanitary conditions are up to standard. These factors are directly related to the health of the fry.
3. Ask about breeding techniques and parent fish sources
High-quality fry often come from parent fish with excellent genetic properties and adopt scientific breeding techniques. Therefore, when selecting a supplier, it is important to ask for key information such as the source, age, health and breeding techniques of the parent fish.
Second, carefully observe the situation of fish fry: health and vitality are the key
1. Check appearance
The high-quality fry have bright color, smooth body surface, no scars and parasites. Fish body should be full of vitality, swimming freely. When selecting, use a magnifying glass and other tools to carefully observe the appearance characteristics of each fish fry.
2. Vitality test
By stirring the water or tapping the container, the reaction speed and swimming ability of the fry were observed. Healthy fry will quickly escape from the agitated area or flapping source, showing strong vitality and stress response ability.
3. Group consistency
Pay attention to check the overall condition of the fry population, including the consistency of size, color and swimming posture. This helps determine whether the fry came from the same batch of healthy parent fish and received good breeding management.
3. Pay attention to the situation before and after transportation: ensure the safe arrival of fish fry
1. Prepare before transportation
Small scale transportation can use oxygen tanks, external foam tanks and ice cubes to cool down; Water tankers are needed for large-scale transportation. Before shipping, negotiate with the supplier about the details of transportation time, method and packaging requirements. Ensure that the conveyance is clean, non-toxic and harmless, and equipped with the necessary oxygenation equipment and insulation facilities. At the same time, understand the weather conditions in transit so that you can take countermeasures.
2. Monitoring in transit
During transportation, pay close attention to the condition of the fry. You can keep in touch with the driver or install remote monitoring equipment, etc. to know the water temperature, water quality and fish fry activity in the transport vehicle at any time. Once an exception is found, take measures to handle it in time.
3. Handling after transportation
After the fry arrive at the destination, the preparation work before stocking should be carried out immediately. Including checking water quality, adjusting water temperature, adding anti-stress agents (such as VC) and so on. At the same time, it is necessary to carry out adaptive training for fish fry, such as gradually increasing the amount of feeding and adjusting the light time, so as to help them adapt to the new breeding environment as soon as possible.
I hope that the majority of farmers can choose healthy and energetic fish fry, laying a solid foundation for the subsequent breeding work!