Penaz, 1973


Penaz, M. (1973) Embryonic development of the barb, Barbus barbus (Linnaeus, 1758). Zool. Listy, pp. 363-374

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Alburnoides bipunctatus Spawning conditions Spawning substrate Lithophilous fishes Lithophils
Barbus barbus Egg Oocyte diameter The average size of the eggs was 1.95 prior to fertilisation 1.95 mm
Barbus barbus Egg Egg size after water-hardening 2.88 after fertilization 2.88 mm
Barbus barbus Egg Egg adhesiveness The chorion of ripe eggs is only feebly sticky Adhesive
Barbus barbus Egg Incubation time The moment at which 50% of embryos are hatched was 194 hours at 16°C, 131.7 hours at 18°C; 98 hours at 19.67°C and only 91 at 20.52°C [in other stidy described as 6 days at 17.1°C] 50.0 days
Barbus barbus Egg Temperature for incubation Incubated at 16, 18, 19.67, and 20.52°C 16.0 °C
Barbus barbus Egg Degree-days for incubation 129.3 DD [At 16°C], 98.8 [At 18°C], 80.3 |At 19.67°C] and 77.8 [At 20.52°C]; in other studies described as 97.6 DD at 17.1°C 129.3 °C * day
Barbus barbus Larvae Initial larval size Mean total length at the time of maximum hatching: 8.99 [When incubated at 18°C], 8.82 [At 19.67°C], 8.31 [At 20.52°C] and 8.96 [At 16.0°C] 8.99 mm
Barbus barbus Larvae Larvae behaviour The hatched embryos lie on one side motionless, showing quite isolated, feeble movements. However, they respond to external stimuli (by light or touch) by very rapid movements along the bottom of the tank. They show no tendency towards hiding in shelters or dark places Demersal
Barbus barbus Larvae Reaction to light The behaviour of the embryos and their response to light changes agasint the preceding, i.e. hatched, developmental stage. Their response to light is negative, the mebryos gathering in the darkest places of the aquarium; if the latter was provided with a simple shelter, the embryos gathered in this space. Towards the end of this stage , the movement activity of the mebryos increases. They rise to the water surface by rapid and intensive movements and then slowly sink passively dow to the bottom of the tank where they rest motionless, lying one one side. Photopositive
Barbus barbus Larvae Onset of exogeneous feeding In the barb, the embryos pass to pelagic life habits and to exogenous food as late as between the 17th and 28 th day of developement, that is on the 11th to 19th day after hatching, depending on water temperature, about 16°C 17.0 °C * day
Barbus barbus Spawning conditions Spawning substrate Lithophilous fishes Lithophils
Chondrostoma nasus Spawning conditions Spawning substrate Lithophilous fishes Lithophils
Leuciscus cephalus Spawning conditions Spawning substrate Lithophilous fishes Lithophils