Report on first time reproductive success from full life-cycle culture of Kaluga sturgeon females (Huso dauricus)

Abstract

Ten females of Kaluga sturgeon (Huso dauricus; 73.8 ± 6.49 kg, total length 204.5 ± 12.8 cm) matured for the first time after a full life-cycle in captivity. Absolute gonad biomass was 8.4 ± 1.3 kg per female and relative fecundity 11.2 ± 1.6%, at maturation stage IV. These fish were induced to spawn by injection of hormone LHRH-A2 at a dosage of 10 lg kg )1 . Male Kaluga was injected one time at 5 lg kg )1 and milt was stripped 16 h after injection of LHRH-A2. Water temperature was about 16 ± 1°C during the induction period. Fertile eggs were obtained 36.8 ± 2.6 h after first injection; they were fertilized by semi-dry method. Fertilization rate was 80.7 ± 3.8%. Fertilized eggs were incubated McDonald jars (hatching rate 85.2 ± 9.8%). There was a strong correlation between body weight (x) and time (y) needed from hormone injection to obtaining fertile oocytes (y = )0.8231x + 98.838 R 2 = 0.8428; P < 0.01). The cultured males ripened as early as at age 5 while females were 8-years old at first maturity.

Analyses of growth performance and realized heritability of the second generation of Indo‐PacificPampus argenteus

“…Li W et al . (2011) artificially inseminated Huso dauricus by the semi‐dry method and found that the fertilization and hatching rates were above 80%. The reason for the low fertilization rate in this study may be that the spermatozoa and ovaries of P. argenteus parents do not mature at the same time and there is a certain time lag.…”

“…(2020) studied the viability of seed production of Macrognathus pancalus reared under confined conditions, and the fertilization rate and hatching rate were over 90%. Li W et al (2011) artificially inseminated Huso dauricus by the semi-dry method and found that the fertilization and hatching rates were above 80%. The reason for the low fertilization rate in this study may be that the spermatozoa and ovaries of P. argenteus parents do not mature at the same time and there is a certain time lag.…”