Table II in Reproduction of Zingel asper (Linnaeus, 1758) in controlled conditions: an assessment of the experiences realized since 2005 at the Besançon Natural History Museum

Table II. – Results of different reproduction trials conducted between 2012 and 2017.
Year2012201220132014201520162017TankDR2DR1DR2DR2DR2DR1DR1Number of females99185394Number of broodstock22244522203028Broodstock age44567unknownunknownNumber of breeding experiments carried out with these broodstock2234511Number of vernalization days30457590120120120Vernalization temperature (°C)6555555Number of eggs laid731099352375411563415061881496Average clutch8121419263923131383774374Minimum clutch4022119287618114168Maximum clutch311128917091375725171820678Number of surviving eggs at 10 days of incubation977579487956340055501194Number of surviving eggs before hatching474068057307336153981175Number hatched165941774717316651061141Average survival rate at 10 days (%)08.5 ± 19.732.3 ± 13.666.5 ± 23.880.1 ± 3.889.1 ± 5.680.3 ± 18.9Average survival rate before hatching (%)08.2 ± 18.928.7 ± 13.859.4 ± 22.279.5 ± 3.387.1 ± 6.379.1 ± 20.4Average hatching rate (%)07.4 ± 17.519.5 ± 9.836.2 ± 14.573.7 ± 5.683.6 ± 5.377.6 ± 20.5Number of positive lays (at –1 larvae)1495384Number of clutches9795384Number of broodstock dead during repro. (March to May)10192147Number of females unable to lay1050000Duration in days between first lay and last lay129121033436Number of lays discarded following a technical problem0000010