In order to explore the artificial proliferation technology of the fine-skinned fish, Xing'anmeng Aquatic Technology Promotion Station began the biological investigation of cold-water fish in the Halah River as early as in 1990 (the report was published in the "Imperial Fisheries" 1995 period 1-2). However, in view of the various conditions at that time and the special location of the Haraha River, the work has not been carried out in depth.
In 2002, the Union Fisheries Station and the Jilin Province cooperative partner jointly developed the resources of the cold water fish of the Haraha River and built a small-scale cold-water fish breeding farm in the same year. In 2003, the Experimental Group for Artificial Propagation of Liner Fish was established. Under the coordination of the Xing'an League Water Affairs Bureau and the Border Defense Department, the fishing of squama broodstock was carried out. By the end of May, a total of more than 100 tails have been caught.
On May 18th, 2003, the experimental team began to enter the experimental stage of artificial propagation of the fine scale fish. At this time, the females who spawned eggs were swollen and soft in the abdomen, and the genital pores were red and swollen. When the tail shank was on, both sides of the ovary sag, and the outline was obvious. The eggs were gently pressed out of the abdomen and flowed out of the body. Mature males exert pressure on the abdomen to ejaculate. Artificial insemination uses dry insemination, and the entire process is performed under shading conditions. Through artificial insemination, 30,000 eggs of fertilized eggs were collected and placed in 5 simple incubators for running water hatching. The water used for hatching is shallow spring water, and the water quality is good; however, the water temperature is too low, only about 3 Â°C, which leads to an extension of the incubation period.
When the technicians checked on June 12, hatching was in progress and the situation was normal. Due to the shorter incubation time, the embryo has not yet developed to the gastrointestinal phase, so the fertilization rate was not detected. The visual quality of eggs is very good for the naked eye.
On June 27th, the rainstorm in Aershan City caused sudden outbreaks of flash floods in local areas. As the river water level rose, the river water inundated the test field, causing the fertilized egg and the broodstock to be destroyed and the trial was suspended.
Through this experiment, we initially mastered the artificial propagation and hatching techniques of the fine-skinned fish and laid a certain foundation for the future work.
Since July, the staff of the testing ground have successively caught more than 20 species of scalefish and are now in the stage of holding up. We are trying to carry out the artificial breeding experiments of squama fish by rainbow trout bringing the rainbow trout to ingest the granule fish to feed pelleted food. This work is underway.
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