Transportation of Macrobrachium rosenbergii seedlings

1. Transportation methods and effects Macrobrachium rosenbergii seedlings are mostly concentrated production. In order to get the shrimp seedlings needed in a timely manner in the shrimp farming area, from April to June each year, we have to carry out a lot of shrimp and seedling transportation. Tools include plastic bags, canvas baskets, iron buckets, etc. The shipping density depends on the size of the shrimp, the water temperature, and the length of the transportation route. At present, the use of oxygen-sealing plastic bags is more convenient and the effect is very good. The bag contains about 6 kg of water (20 kg of water). After the shrimp is filled with enough oxygen, it is placed in a carton. The external packing is used to hold the bag. The total weight is 7-8 kg. You can get on the train (car, train ) Or aircraft transport. Because shrimps are young and their asphyxiation point is 0.96mg/L (dissolved oxygen in water), which is obviously higher than that of the main cultured fish, and they have the habit of mutual-residual food, so the shipping density of shrimps is much higher than that of fish seedlings. low. Over the years, in a large number of long-distance transportation, when the water temperature is 22-26 °C, generally every plastic bag seedlings 3000-5000, the survival rate is about 90%, shrimp swimming after the pond is normal. The length of transportation time directly affects the number of seedlings per bag. The shipment time is about 10 hours, the density is 4500-5000 tails/bag; the shipment time is 20-30 hours, and the density is 2500-3000 tails/bag. In the case of similar density, the survival rate of shrimp seedlings was inversely related to the shipping time. In production, our largest transportation volume is 450 boxes (bags), 2.25 million, and the longest transportation time is 32 hours. The highest survival rate is 98%. All this shows that this method of transportation is feasible and fully meets the transportation technology level of the main farmed fish. 2. Precautions In order to ensure the safety of transportation and improve the survival rate of transportation, all preparations for transportation equipment, oxygenation, packaging equipment, and freight plans for trains and airplanes must be completed before transportation, and the time of the journey should be accurately calculated and the appropriate loading density should be selected. If necessary, a gradient test of the density of the bagged shrimp should be done, especially when transporting large quantities of goods over long distances. The water for transport is best taken from the larval rearing tank or holding pond. The water temperature should be the same as the nursery pond. In order to avoid the killing of the shrimp seedlings, a steamed egg or duck egg that has been filtered through a 40-mesh plastic mesh cloth should be fed prior to packaging and transportation. The shrimp should be fully fed, and then the bait in the larvae box should be completely removed. Dirt, to ensure the accurate count of shrimp seedlings and the cleanliness of the transport of water quality. After the shrimps are transported to their destinations, plastic bags should be put on the surface of the shrimp ponds for 15-30 minutes. After the water temperatures inside and outside the bags are basically the same, they are opened in the windward bank to increase the survival rate of the shrimp seedlings.

Tuberculosis

Tuberculosis (TB) is a potentially fatal contagious disease that can affect almost any part of the body but is mainly aninfection of the lungs. It is caused by a bacterial microorganism, the tubercle bacillus or Mycobacterium tuberculosis.Although TB can be treated, cured, and can be prevented if persons at risk take certain drugs, scientists have never comeclose to wiping it out. Few diseases have caused so much distressing illness for centuries and claimed so many lives.

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