Jennigs, 1988



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Aristichthys nobilis Egg Oocyte diameter 1.4-1.5 [Unswollen egg] 1.45 mm
Aristichthys nobilis Egg Egg size after water-hardening 4.82-5.13 [Swollen egg] 4.97 mm
Aristichthys nobilis Egg Egg Buoyancy The eggs are bathypelagic and must float to hatch [In rivers of eastern Asia, if spawning occurs during periods of rising water levele, the eggs and larvae are carried out dowstream by the current to quiet, flodded lakes, creeks, and channels, which serve as nursery areas] Pelagic
Aristichthys nobilis Egg Egg adhesiveness Non-adhesive Non-Adhesive
Aristichthys nobilis Egg Incubation time About 1 days after fertilization at 22-26°C 24.0 days
Aristichthys nobilis Egg Temperature for incubation 22-26 24.0 °C
Aristichthys nobilis Larvae Initial larval size 5.5-6.0 5.75 mm
Aristichthys nobilis Larvae Larvae behaviour Motile under natural conditions, however, it is carried out by the water current Demersal
Aristichthys nobilis Larvae Temperature during larval development 22-26 24.0 °C
Aristichthys nobilis Larvae Full yolk-sac resorption 154-162 [At 7 days at 22-26°C, the yolk sac is completely absorbed and the larvae migrate along the shore, feeding exclusively on external food] 158.0 °C * day
Aristichthys nobilis Larvae Onset of exogeneous feeding [After 4.5-5 days at 22-26°C, the larvae are 8.5-9.0 mm; the larvae swim in the water column and feed, but also continue to utilize yolk] 4.75 °C * day
Aristichthys nobilis Female Age at sexual maturity Differ between regions from 3-4 [South China and Taiwan] to 6-7 [Northeast China, Israel] to 10 [Moscow] 3.5 year
Aristichthys nobilis Female Length at sexual maturity 67.2-70.3 [Female] 68.75 cm
Aristichthys nobilis Female Weight at sexual maturity 5-10 [Female] 7.5 kg
Aristichthys nobilis Female Female sexual dimorphism External sexual dimorphism can be determined by examining the pectoral fins. In the male, these fins have a sharp edge along the dorsal surface of several front rays, whereas in the female this characteristic is absent. This secondary sexual characteristic of the male is formed before maturity, and once formed, persists throughout its lifetime. Absent
Aristichthys nobilis Female Absolute fecundity 288-1100 694.0 thousand eggs
Aristichthys nobilis Female Maximum GSI value 17-20% 18.5 percent
Aristichthys nobilis Male Age at sexual maturity Range from 2-3 [South China] to 5-6 [Northeast China] to 9 [Moscow] 2.5 years
Aristichthys nobilis Male Male sexual dimorphism External sexual dimorphism can be determined by examining the pectoral fins. In the male, these fins have a sharp edge along the dorsal surface of several front rays, whereas in the female this characteristic is absent. This secondary sexual characteristic of the male is formed before maturity, and once formed, persists throughout its lifetime. Males usually reach sexual maturity one year earlier than females Absent
Aristichthys nobilis Spawning conditions Spawning season The spawning season in China extends from April to June, peaking in late May ['April', 'May', 'June']
Aristichthys nobilis Spawning conditions Spawning temperature Must be higher than 18°C, about 26-30°C 28.0 °C
Aristichthys nobilis Spawning conditions Spawning water type Natural reproduction occurs in channel of large rivers in swift current where velocities exceed 0.8 m/sec [The spawning is generally deposited among the rocks of rapids in river channels, behind sandbars, and at islands at the junction of the currents] Flowing or turbulent water
Aristichthys nobilis Spawning conditions Spawning depth Much to the activity is generally at the surface of the water No data
Aristichthys nobilis Spawning conditions Nycthemeral period of oviposition Any time of the day Day
Aristichthys nobilis Spawning conditions Mating system Promiscuous [The males actively chase the females, occasionally prodding their head against the belly of the females] Promiscuity
Aristichthys nobilis Spawning conditions Parity After spawning, they migrate to floodland lakes No category