Predictions & Data for this entry
| Model: std | climate: Dfb | migrate: Mp | phylum: |
| COMPLETE = 1.8 | ecozone: THp | food: biCi | class: |
| MRE = 0.106 | habitat: 0iFr | gender: D | order: |
| SMSE = 0.026 | embryo: Fg | reprod: O | family: |
Zero-variate data
| Data | Observed | Predicted | (RE) | Unit | Description | Reference |
|---|---|---|---|---|---|---|
| ab | 8 | 10.19 | (0.2738) | d | age at birth | RochWill1991 |
| ap | 2550 | 1687 | (0.3385) | d | age at puberty | Rein2002, PeteVecs2006 |
| am | 9500 | 9501 | (7.851e-05) | d | life span | PikiDoek2005 |
| Lb | 0.65 | 0.6747 | (0.03804) | cm | total length at birth | RochWill1991 |
| Lp | 42 | 43.31 | (0.03109) | cm | total length at puberty | RochWill1991 |
| Li | 120 | 112.6 | (0.06206) | cm | ultimate total length | RochWill1991 |
| Wwb | 0.0014 | 0.001281 | (0.08528) | g | wet weight at birth | RochWill1991 |
| Wwp | 292 | 338.6 | (0.1596) | g | wet weight at puberty | RochWill1991 |
| Wwi | 6400 | 5944 | (0.07118) | g | ultimate wet weight | Rein2002 |
| Ri | 295.9 | 296.4 | (0.001576) | #/d | reprod rate at TL = 77 cm | Rein2002 |
Pseudo-data at Tref = 20°C
| Data | Generalised animal | Acipenser ruthenus | Unit | Description |
|---|---|---|---|---|
| v | 0.02 | 0.05179 | cm/d | energy conductance |
| kap | 0.8 | 0.7804 | - | allocation fraction to soma |
| kap_R | 0.95 | 0.95 | - | reproduction efficiency |
| p_M | 18 | 11.88 | J/d.cm^3 | vol-spec som maint |
| k_J | 0.002 | 0.002 | 1/d | maturity maint rate coefficient |
| kap_G | 0.8 | 0.7925 | - | growth efficiency |
Discussion
- mod_3: Data set Ri corrected
Facts
- *Sex ratio:* The numerical proportions of the sexes vary in different rivers and according to the season.At the spawning sites the males are usually predominant, accounting for about 60 to 70 % of all spawning participants.Among the fishes on the feeding grounds, the proportions of the sexes are equal, while among the individuals spending the winter in deep water, females are often observed to be predominant. In general the ratio of the sexes among the sterlets evidently approximates 1:1 (Reinartz 2002). (Ref: Rein2002)
- *reproductive capacity:* of our farmed sterlets began to deteriorate in fish older than 14-16 years (Data from aquaculture, Williot et al. 2005) (Ref: WilliBron1993)
- *Spawning frequency:* only once or twice during life (Danube, Kovri_nych 1988 citt. in Holcik et al. 2006); every year in Danube (both males and females, Manea 1966 citt. in Rochard et al. 1991); 1-2 for females (Jankovic 1958 citt. in Rochard et al. 1991); intervals between two spawnings 1-2 years (Bacalbasa-Dobrovici 1991); each 1-3 years (Vassilev sturgeon.pdf); every 2 years (Pikitch et al. 2005); The question of the spawning periodicity of sterlets has yet to be answered. Some investigators state that they spawn every year, while others tend to believe that the gonads may become ripe again only after a one or more years pause, the recovery period being shorter for males. One researcher found that in the Danube River, males and young females up to the age of seven years spawn every year. Older females, however, become ripe only after an interval of two years (Reinartz 2002). it is believed that younger individuals are spawning each year, and the old individuals every second year (Lenhardt et al. 2005a) period between two spawnings 1 year (40-50% sample), or two years (27-34%). The overlap of these different durations led to variations in the annual number of spawnable females from 39% to 86%, with the highest percentages occurring at 4-year intervals. The reproductive capacity of our farmed sterlets began to deteriorate in fish older than 14-16 years (Data from aquaculture, Williot et al. 2005) (Ref: PikiDoek2005, Rein2002, PeteVecs2006)
- *Fecundity:* 7,000-108,000 eggs/female (in Danube, Reinartz 2002; Kolarevi? 2004; Bloesch et al. 2006); 4,000-140,000 eggs/female (Ural River, Lagutov and Lagutov 2008); up to 137,600 eggs/female (Simonovi? 2001) (Ref: Rein2002)
- reproductive age 3-17 (Ural River , Lagutov and Lagutov 2008); 4-5 (Kovri_nych 1988 citt. in Holcik et al. 2006); 4-5 years (Bacalbasa-Dobrovici 1991); 4-7 (in Danube Reinartz 2002; Bloesch et al. 2006; Lenhardt et al. 2005a); 6 years (Pikitch et al. 2005); 6 years (in the wild), 3 years (in aquaculture) (Chebanov and Billard 2001); 7 years (Vassilev sturgeon.pdf); 7-8 (Ural River, Lagutov and Lagutov 2008); 7-9 years (40-45 cm, URSS, Charlon and Williot 1978 citt. in Rochard et al. 1991). (Ref: PikiDoek2005)
- *Maturity:* between 3-8 years of age (Peterson et al. 2006), which sex?; Maturity at age 4-5 (Simonovi? 2001), which sex?; 5-6 years (Kolarevi? 2004), which sex?; Age of first offspring for males: 3-4 years (Bacalbasa-Dobrovici 1991); 3-5 (in Danube, Reinartz 2002; Bloesch et al. 2006; Lenhardt et al. 2005a); 3-7 (in Danube, Manea 1966 citt. in Rochard et al. 1991); 4 years (Vassilev sturgeon.pdf); 4 years (in the wild), 2 years (in aquaculture) (Chebanov and Billard 2001); 4-5 years (Ural River, Lagutov and Lagutov 2008; 35 cm, USSR, Charlon and Williot 1978 citt. in Rochard et al. 1991); 5-7 (Kovri_nych 1988 citt. in Holcik et al. 2006); males reach sexual maturity, as a rule, one to two years earlier than the females (Reinartz 2002) (Ref: Rein2002)
- *Egg diameter:* 1.9-2.5 mm (Detlaf et al. 1981 citt. in Rochard et al. 1991); 2.5-2.6 mm (Data from aquaculture, Williot et al. 2005) (Ref: WilliBron1993)
- *Ultimate length:* rarely exceeds 80 cm (Peterson et al. 2006); >90 cm (Maitland 1987 citt. in Rochard et al. 1991); 100-120 cm (Vassilev sturgeon.pdf); 110 cm (Pikitch et al. 2005); >110 cm (Tsepkin and Sokolov 1979 citt. in Rochard et al. 1991); >125 cm (Charlon and Williot 1978 citt. in Rochard et al. 1991); rarely 125 cm, normally up to 100 cm (in Danube, Reinartz 2002; Kolarevi? 2004); 125 cm (Simonovi? 2001; Bloesch et al. 2006; Lenhardt et al. 2005a) (Ref: WilliBron1993)
- *Ultimate weight:* rarely exceeds 3 kg (Peterson et al. 2006); up to 15 kg (Ural River, Lagutov and Lagutov 2008); 16 kg (Vassilev sturgeon.pdf; Pikitch et al. 2005; Simonovi 2001; Lenhardt et al. 2005a); >16 kg (Charlon and Williot 1978 citt. in Rochard et al. 1991); rarely 16 kg, normally up to 6-6.5 kg (in Danube, Reinartz 2002; Kolarevi? 2004) (Ref: Rein2002)
- *Age-length-weight relationship:* 10 years = 62.0 cm = 1123 g (females), 7 years = 47.9 cm = 477 g (Sample from Holcik et al. 2006); 1 years = 26 cm, 2 years = 35 cm, 6 years = 52 cm, 11 years = 59 cm (Jankovic 1956 citt. in Bacalbasa-Dobrovici 1991); 4-5 years = 35 cm (males), 7-9 years = 40-45 cm (females) (Charlon and Williot 1978 citt. in Rochard et al. 1991); 4-7 years = 40 cm (females, maturity) (Reinartz 2002) (Ref: Rein2002)
- *Life span:* 10 years females, 7 years males (Sample from Holcik et al. 2006); 24 (in Danube) (Reinartz 2002; Bloesch et al. 2006); 25 years (Vassilev sturgeon.pdf; Simonovi? 2001; Kolarevi? 2004); 26 years (historic), 22 (current) (Pikitch et al. 2005); 26 years (Lenhardt et al. 2005a); 26 (archeological remains), 26 (Kuibyshev reservoir), 27 (Yenisei River) (Reinartz 2002); around 30 years (USSR, Charlon and Williot 1978 citt. in Rochard et al. 1991); 30 (Ural River, Lagutov and Lagutov 2008) females live considerably longer than the males (according to all authors, Reinartz 2002) (Ref: Rein2002, PikiDoek2005, WilliBron1993)
Bibliography