Figure 3 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341

Figure 3 - Course of the tested environmental factors during 331 days: conductivity (C), water level (WL) and temperature (T) in breeding tank II containing one female and one male Notopterus notopterus. Irregular spawning intervals were observed for 6 times within a 6-month experimental period. The breeding experiment was started after 40 days of acclimatization. Note the first swollen belly of the female (Arrow). *Asterisks refer to observed spawnings