Embryonic, larval and juvenile development of hybrid between Schizothorax wangchiachii and Percocypris pingipingi

We observed the embryonic, larval and juvenile development of hybrid of Schizothorax wangchiachii and Percocypris pingipingi via dry artificial reproduction, so as to provide basic data for cross breeding and variety selection. The results show that the F₁ hybrid by S. wangchiachii (♀) and P. pingipingi (♂) embryos developed well at water temperature of (14.5±1.0) ℃ and pH of 8.10−8.81. The fertilization rate was 95.33%, and the hatching rate was 71.12%. The fertilized eggs were hatched within 144.33 h, and the sum effective accumulative temperature was 2 092.79 h·℃. Under similar conditions, the embryos grew faster than the parents, and the formation order of each organ was different from that of the parents. The larvae grew well, but the developmental speed and growth rate were slower than those of the father. Under the same experimental conditions, the F₁ embryos of P. pingipingi (♀) ×S. wangchiachi (♂) were unable to develop normally, and the time required for development to the gastrula period was 51.25 h, and the required accumulated temperature was 743.13 h·℃. The mortality rate of the end of the gastrointestine was 85.83%, and only 12 embryos hatched in the end with all larvae deformed. All larvae died after 3 d. The results show that it is feasible to cross between S. wangchiachii (♀) and P. pingipingi (♂).