Krupta, 1988



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Associated characteristics


Species Development state Trait Primary Data Secondary Data
Barbus barbus Egg Egg adhesiveness Since barbel eggs are slightly sticky it was not necessary to remove stickiness Adhesive
Barbus barbus Egg Incubation time Their incubation at water temperature of 20.2°C lasted 3 days and 15 hours from insemination to hatching of the first embryos, and 4 days and 11 hours to the hatching of the last embryos 20.2 days
Barbus barbus Egg Degree-days for incubation 73.8 DD for the first embryos and 90 DD for the last embryos at 20.2°C. Others authors observed hatching at 17.1°C on the 6th day after insemination (97.6 DD) 73.8 °C * day
Barbus barbus Egg Temperature for incubation The eggs were incubated in PVC incubators 250 ml in volume, based on the principle of the Zuh flask, at constant water temperature of 20.2°C. When the first embryos had hatched the water temperature was decreased to 19.2°C. 20.2 °C
Barbus barbus Egg Egg size after water-hardening Having contacted with water, eggs increased to 2.4 mm in diameter (i.e. by 20%) within one hour. 2.4 mm
Barbus barbus Egg Oocyte diameter The mean diameter of non-swollen barbel eggs is 2.0 mm 2.0 mm
Barbus barbus Larvae Temperature during larval development Reared at 19°C 19.0 °C
Barbus barbus Larvae Full yolk-sac resorption The change to exclusively exogenous nutrition took place on the 15th to 17th day of the development, at 19°C 15.0 °C * day
Barbus barbus Larvae Onset of exogeneous feeding The larva at the age of 12 days and 14 hours (Tl=12.9 mm, w=13.5 mg) was observed to ingest food for the first time (at that time the number of degree-days from the beginning of development was 245.8) at 19°C 12.0 °C * day
Barbus barbus Larvae Initial larval size Embryo hatched at the beginning of the hatching period were 7.0 mm in total length, those hatched at the end 7.4 mm total length. The total length and weight of hatched embryos were 7.0-7.4 mm and 5.8-6.0 mg, respectively. 7.2 mm
Barbus barbus Larvae Larvae behaviour After hatching the embryos rested on the bottom of the hatching apparatus, performing only occassional short movements, most frequently when disturbed by handling the apparatus Demersal