View Full Table | Close Full ViewTable 1.

Tested parameters of heat shock treatment for tetraploidization in sterlet and Siberian sturgeon. Duration of 1 mitotic cycle during the period of synchronous cleavage division (τo) is approximately 63 min for sterlet and approximately 59 min for Siberian sturgeon at 16°C according to Dettlaff et al. (1993) and Gisbert and Williot (2002)

 
Species Tempera-ture,°C Duration, min Starting time, min Starting time, τo
Sterlet 34 2 56 0.88
74 1.75
87 1.38
99 1.57
3 56 0.88
74 1.75
87 1.38
99 1.57
37 2 50 0.79
56 0.88
74 1.75
87 1.38
99 1.57
4 50 0.79
56 0.88
74 1.75
87 1.38
99 1.57
Siberian sturgeon 37 2 41 0.7
47 0.8
53 0.9
59 1.0
65 1.1
71 1.2
3 41 0.7
47 0.8
53 0.9
59 1.0
65 1.1
71 1.2



View Full Table | Close Full ViewTable 2.

Comparison of weight and body malformation rate of tetraploid and diploid juveniles of sterlet at 9 and 11 mo of age

 
Age, mo Ploidy Number of fish (percentage) Average weight, g Malformation rate, number of malformed fish (% of malformed)
9 2n 27 (66%) 20.1 2 (7.4%)
4n 14 (34%) 21.2 1 (7.1%)
11 2n 26 (65%) 45.9 2 (7.7%)
4n 14 (35%) 47.4 1 (7.1%)