Sauvonsaari, 1971


Citation

Sauvonsaari, J. (1971) Biology of stone loach (Nemacheilus barbatulus L.) in the lakes Päijänne and Pälkänevesi, Southern Finland. Ann. Zool. Fennici, pp. 187-193.

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Barbatula barbatula Egg Oocyte diameter 1.08 [Not specified] 1.08 mm
Barbatula barbatula Egg Egg adhesiveness Eggs adhere to the bottom and weeds Adhesive
Barbatula barbatula Egg Incubation time 16 days [14°C], 11 [18°C] and 7-8 [20°C] 7.5 days
Barbatula barbatula Egg Temperature for incubation 14-20°C 17.0 °C
Barbatula barbatula Egg Degree-days for incubation 16 days [14°C], 11 [18°C] and 7-8 [20°C] 7.5 °C * day
Barbatula barbatula Female Age at sexual maturity In Finland, the stone loach usually matures at the age of two years, those slower in development at the age of 3 years [Sex not specified] 1.0 year
Barbatula barbatula Female Length at sexual maturity The smallest spawning female was 6.2 cm long 6.2 cm
Barbatula barbatula Female Absolute fecundity The number of eggs laid during one spawning period varies between 700 and 5000 700.0 thousand eggs
Barbatula barbatula Spawning conditions Spawning migration distance The stone loach spawns in the same places where it lives No data
Barbatula barbatula Spawning conditions Spawning season Spawning usually occurs in May, it may de delayed to early June in cold years ['May', 'June']
Barbatula barbatula Spawning conditions Spawning period duration Exact observations on the length of the spawning period are lacking andit may vary to some extend, depending on water temperature of the waer, but normally appears to take only a few days No data
Barbatula barbatula Spawning conditions Spawning temperature Spawning begins as the shore waters warm to about 8°C 8.0 °C
Barbatula barbatula Spawning conditions Spawning depth Shore waters No data
Barbatula barbatula Spawning conditions Spawning substrate Among shore rocks, eggs adhere to the bottom and weeds Lithophils
Barbatula barbatula Spawning conditions Nycthemeral period of oviposition Spawns at night Night
Barbatula barbatula Spawning conditions Spawning release Female lay their egg one by one No category
Barbatula barbatula Spawning conditions Parity Specimens over four years old were rare, and only a few 6-year-olds were found No category