Technical points of Live Fish Transportation

This paper mainly studies and summarizes the open live fish transportation methods of common freshwater adults and species in the market, and studies a simple, convenient, large loading, high survival rate and low transportation cost of live fish transportation method.

I. method of transportation

1. Before filling the water tank with fish, it is necessary to fill the water tank of the car where the fish are transported. The water used had better use underground hard water. Generally, the water tank is 40cm to 50cm deep. When transportation in summer, it is best to add about 1 stroke 5 of the original pond water when adding underground well water, so as not to make a big difference between the water body of the water tank and the original pond water. After loading the fish, it is required that the water surface in the tank is basically close to the top of the tank, so that the car can reduce the back and forth vibration of the water body in the process of transportation, thus reducing the damage to the fish body.

two。 Do not move too much when loading fish, so as to avoid injury to the fish. In long-distance transportation, it is generally necessary to stop baiting the transported fish one or two days before transportation to empty the digestive tract and avoid polluting the water quality in the process of transportation.

3. In the process of loading fish in the aeration facility, if the fish in the tank has a floating head, it is necessary to turn on the oxygen switch. The amount of oxygen is good to ensure that the plastic hose pores at the bottom of the water tank can evenly emit bubbles. If you load too much fish, you can appropriately increase the amount of oxygen according to the situation. After loading the fish, secure the top cover.

4. The management in the course of transportation mainly checks whether the oxygenation facilities are in good condition. Now most transport vehicles install the pressure gauges of oxygen cylinders in the cab. If one oxygen cylinder does not have oxygen, it can be found in time and transferred to another oxygen cylinder immediately. People who often carry long-distance transportation usually connect multiple oxygen cylinders together, which can prevent the oxygen tubes from switching multiple times between each one. When carrying out long-distance transportation, it is best to check on the roof every 3 hours or so to avoid other accidents.

II. Transport test results

1. Loading capacity

(1) the load of adult fish. As adult fish are directly sold on the market, the loading capacity can be loaded as much as possible as long as it does not affect the sale of the market. According to the one-year transportation test, we have summed up the different full load of common freshwater edible fish in different seasons and different transportation time, and the size of the fish tank is 4.2 m × 1.8 m × 0.9 m.

(2) loading capacity of fish species. Fish species transportation is mainly used for reculture, so fish species transportation can not be like adult fish transportation, not only to ensure the survival rate of transportation, but also to ensure the survival rate of reculture after being put into the new culture water body. This requires transport to be carried preferably in winter and early spring when the temperature is lower. Through our fish species transportation experiment for more than one year, the suitable loading quantity of common freshwater fish species in different transportation time is summarized, and the specification of fish tank is 4.2 m × 1.8 m × 0.9 m.

two。 Service time of oxygen in compressed oxygen cylinders

Through our many experiments and studies, we have summed up the economic oxygen supply time of a compressed oxygen cylinder: according to the full load of adult fish, using the 4.2 m × 1.8 m × 0.9 m fish tank specification we used in the experiment, one bottle of oxygen can be supplied for about 3 hours. According to this, we can calculate the economic oxygen supply time of a bottle of oxygen in different fish containers and how many bottles of oxygen should be equipped in different transportation time.

3. Taking Luoyang as an example, the transport benefit analysis takes Luoyang as an example, the size of the fish container is 4.9m × 1.8m × 0.8m, and the transportation cost is about 180yuan per 100km. According to the conservative transport volume of 2000 kg, the transportation cost per kilogram of fish is about 0.09yuan. Most of the adult fish on the Luoyang market are transported from fish ponds of about 50 kilometers (100 kilometers round trip). The difference between the fish price on the fish ponds and the wholesale price on the market is 0.40 yuan / kg, so the gross profit per car is generally about 600 yuan. If the transport volume of each car is about 5000 kg during the holiday period, especially during the Spring Festival, the profit per car will be greater.

III. Analysis and discussion

1. When transporting live fish, it is best not to mix different varieties and specifications of fish together, which can improve the survival rate of transportation. In general, crucian carp and carp of the same specification are properly mixed and do not have much influence on each other. We have tried to transport carp and grass carp of the same specification together, resulting in a large number of grass carp casualties, which should be paid attention to in future transportation.

two。 We divide the iron box for transporting fish into two or three grades with steel plates every 1.5 meters or so, which have two main functions: one is to separate and load different species of fish during each transportation, and the other is to avoid excessive concussion of the water body during transportation. thus reducing the damage to the fish transported.

3. In the past, when carrying out the transportation of live fish, compressed oxygen cylinders were used to enter the bottom of the container through a plastic pipe, and a large amount of oxygen bubbles were emitted at the end of the gas stone to increase oxygen, but this can only be used for the transportation of small containers and small quantities. We use plastic hoses in the shape of "S" to spread at the bottom of the fish iron box, with a distance of about 15 cm between each two adjacent tubes. a small opening for conveying oxygen is pierced with fine silver needles every 10 cm, so that the water body can be oxygenated evenly, and the air mouth pierced with silver needles can emit air bubbles as small as air stone, so that the oxygen has reached a very high dissolution rate.

4. For the transportation of fish species, according to the disinfection time of different fish disinfection drugs used before arriving at the destination, putting the disinfection drugs into the water body can achieve a good disinfection effect, thus reducing the unloading time and labor. After arriving at the destination, when the fish are transferred from the container to the aquaculture water body, due to the physical weakness of the tired fish after the journey, they are suddenly moved into a very different environment, often dying in large numbers because they cannot bear it for a while. In order to avoid this situation, the new water can be gradually mixed with the old water in the container to make the fish adapt to the new environment and then transferred to the pond.