Hello officials, today I will share with you some technical questions often asked by shrimp farmers, from shrimp fry to finished shrimp this process should be how to select good shrimp fry, raise good finished shrimp; Xiaobian mainly talks about how to raise shrimp from the following four aspects, how to seek benefits for shrimp farmers and shrimp farmers, I hope you like it!
<h1 class="pgc-h-arrow-right" data-track="16" > how to judge the survival rate of shrimp fry</h1>
Make a cage, the mesh is slightly smaller than the shrimp fry size, placed in the pond downwind outlet, and about 0.5m from the shore, sinking to the bottom, it is best to put it into the pond 3-4 days in advance. When seeding, about 100 shrimp fry are placed in a cage. Because the water in the shrimp pond circulates with each other, the environment in the cage is almost the same as the environment in the pond, and the shrimp fry in the whole pond can be estimated by the number of shrimp fry in the cage. It should be noted that the sand silk netease epiphytic microalgae in the cage, blocking the exchange of water flow, needs to be cleaned once in 2-3 days, affected by this, the number of shrimp fry in the cage will be lower than half to about 10%.
Scrape shrimp fry along the edge by hand copying net, if the seedling density in the pond is 50,000 tails / mu, it can generally be scraped to 20-30, which is a normal phenomenon, it is recommended to scrape several times for comprehensive consideration. Early shrimp fry swim throughout the pond, usually there are fewer upwind shrimp fry, more downwind shrimp fry, shrimp fry after 2-3 days of adaptation stage, swimming to the shore 1.5m-2m regional activity, so the observation location of different results are different. In addition, it can be combined with the state and physique of scraped shrimp fry to support evidence, if the shrimp fry have the phenomenon of lying on the edge, swimming pond, etc., or the body color is white, the intestine is exposed, the liver and pancreas are blurred, etc., it can be determined that the shrimp fry begin to develop disease and the survival rate decreases.
<h1 class="pgc-h-arrow-right" data-track="15" > feed halogen worms, which are from the outside sea, and halogen worms also come with many Vibrio bacteria</h1>
We generally do not recommend that shrimp farming be fed fresh feed such as brine worms (harvest worms) and blue clams, especially in healthy shrimp ponds with no pathogen detection, unguarded fresh feed should not be fed, because fresh feed carries a higher risk of pathogens. There is already production feedback, there are signs of leukoplakia / erythroidosis shrimp ponds, most shrimp can still feed, feeding some good quality brine worms or blue clams, can play a role in protecting the remaining healthy shrimp.
<h1 class="pgc-h-arrow-right" data-track="14" > prevent stress in shrimp</h1>
Shrimp stress may be caused by a variety of conditions, such as temperature, dissolved oxygen, salinity and other conventional water quality indicators beyond the normal range, or conventional water quality index mutation range is too large; disinfectants, pesticides and other drugs concentration or time of action is overstimulated; external stimuli such as alarms are too strong; acute or chronic infection with pathogens; and even malnutrition, overnutrition or nutritional imbalance. Generally speaking, maintaining good water quality and substrate quality, environmental stability, reducing the impact of sudden climate changes on water bodies and the environment, avoiding long-term or sudden artificial stimulation, and feeding reasonably and accurately are all measures to prevent shrimp stress.
<h1 class="pgc-h-arrow-right" data-track="10" > how to circumvent serious problems</h1>
First of all, when purchasing shrimp fry, you should examine the responsibility of the nursery, understand the self-quarantine or third-party quarantine of the nursery, observe the health of the shrimp fry, screen the shrimp with a complete appearance, vigorous vitality, full liver and deep color, high fat content of the shrimp, it is best to use the kit to do the pathogen quarantine of the shrimp fry, to ensure that the shrimp fry do not carry the parahaemolytic Vibrio caused by AHPND as much as possible, and secondly, the shrimp pond should be drained in advance, clear the pond, dig out the silt, dry the pond, fully disinfect, set up a reservoir, cultivate water in advance, cultivate algae, or cultivation of beneficial microbial-enhanced biofloccs; When releasing seedlings, use a limited range of landmark thickness in order to smoothly convert shrimp fry into feed, and do not breed for a long time under the condition of excessively high seed density; After the seedlings are released, they are fed accurately according to the amount of food ingested, and the feeding method of eating fewer meals is adopted to ensure that the feed fed for each feeding can be eaten within 1 hour, and the feed is strictly avoided after being soaked in water for a long time, and the remaining materials are absolutely prohibited.
Factory farming shrimp has many advantages, but it is not perfect, factory farming on nutrition, technical management and other requirements are very high, which requires us to do a good job in all aspects of prevention in daily feeding, do a good job in advance of prevention and control measures, or can avoid the occurrence of diseases, wait until the occurrence of diseases and then take measures, it will not help.