Management of exotic fingerling of black fish
There are three sources of black fish fry: the first is artificial breeding; the second is to buy from other places and units; the third is to catch wild fry in the lush places of reservoirs, lakes and ditches. The following is an introduction to the management of the latter two seedlings as follows:
I. seedlings purchased by non-local and non-local units
When buying fry, carefully select fish with strong physique and good quality. The specific standards are: from the appearance of the fish, the scales and fins are required to be complete, bright and shiny, normal shape, no traumatic disease. From the point of view of physique, it requires high fatness, lively swimming and quick response. From the specification point of view, it requires the same batch of fish species, individual uniform, consistent specifications. A fish species with these conditions is a good fish species.
After buying fish fry, disinfect the fish in a bath with salt water or bleach before stocking, and then put them in a pond or cage.
2. Wild seedlings caught
The breeding season of black fish is from May to July every year, and it is the most popular in June. Therefore, according to their breeding habits, we can look for black fish fry populations in the shallow water areas of ditches, swamps, ponds, lakes and reservoirs with lush weeds. When a black fish population is found, it can be made into a semicircular fishing net (called end net by fishermen) with 30-50 mesh nylon mesh or polyethylene mesh, or trapped by ecstasy array.
The ecstasy array is easy to be located in the flat place of the pool bottom in the shallow water area, or intercepted at the reservoir branch, lake branch or river branch.
The ecstasy array is composed of a pile, a foil (fish wall) wall and a fish extraction part. The pile is made of bamboo pole or 14-inch steel bar (coated with antirust agent), 1.5-2.0 meters long, and the number varies according to the length of the ecstasy array, usually inserted every 3-4 meters. The foil wall is made of bamboo and polyethylene fish flower mesh, commonly known as Chuanzi. The length of the channeling depends on the depth of the water and the length of the interception. The fish collection part is a foil ring made of channeling seeds, which is of different sizes and shapes, usually of different sizes, forming a very complex maze, and the fish are lured into the foil ring and cannot escape. The last part of the fish section is closed with a rope, untie the fish when taking the fish, pour out the fish and sift them for classification.
When the large size seedlings of more than 10 cm are caught, they can be disinfected in salt water or bleach solution and temporarily cultured in small ponds or cages for another 10 or 15 days before they can be transferred to adult fish ponds. The small size seedlings caught must be cultivated to the required specifications before they can be transferred to adult fish ponds for culture.
- Prev
Storage and transportation technology of pollution-free fish
Aquaculture aquatic products from the pond to the table to implement the whole process of safety and quality control, in which storage and transportation is one of the important links, if there are mistakes in storage and transportation, the so-called pollution-free will fall short of success. 1. The quality of water for storage and use shall comply with the relevant provisions of the State. Fish in the process of storage and transportation should be light, light transport, to avoid extrusion and collision, pay attention not to dehydration or deicing. Second, the packing container should be non-toxic, odorless, clean, strong and with good drainage conditions. Live fish can be filled with canvas buckets, live fish boxes or nylon bags with oxygen, while fresh fish can be filled with bamboo.
- Next
"Color observation" diagnosis and Prevention of Fish and Shrimp
After fish and shrimp get sick, a certain part or organ of the body shows a unique color, which becomes the characteristic symptom of the disease. Animal medical workers make the name of the disease for disease differentiation and prevention, which is a common method in the field of animal medicine. This is briefly described as follows: first, "red" diagnosis (1) eel red spot disease is caused by Pseudomonas eel, mainly harmful to Japanese eel, European eel is not easy to be infected. Symptoms: punctate bleeding on the base of the lower jaw, operculum, pectoral fin and abdomen.
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?