No detailed citation.
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 |