Reproductive biology ofPseudocorynopoma doriai(Pisces: Characidae) in the High Basin of the Samborombón River, province of Buenos Aires, Argentina

Abstract

The reproductive period of the Glandulocaudine Pseudocorynopoma doriai was determined by the analysis of 240 females, 90 males and 138 immature individuals collected monthly in the Manantiales and the El Portugue´s rivers. The reproductive period is seasonal, occurring from late winter to mid-summer, with another reproductive peak of smaller magnitude in early autumn. The mean monthly GSI in males has a significant correlation with rainfall. Other analyzed environmental variables, including temperature, photoperiod, pH and conductivity, did not show a correlation with the mean monthly GSI in females and males. First maturity in females was reached within the 42-43 mm standard length class. Like other Glandulocaudines from southern Brazil, males initiate sexual maturation before females, which implies an adaptive advantage in that this would enable females to spawn under optimal environmental conditions. The mean absolute fecundity was 1286.42 oocytes (SD ¼ 496.9083); the mean relative fecundity was 0.5070 (SD ¼ 0.1333) oocytes by milligram body weight.

Reproductive strategies in two inseminating species of Glandulocaudini, Mimagoniates microlepis and Mimagoniates rheocharis (Characiformes: Characidae: Stevardiinae)

“…Other inseminating species of the Stevardiinae [ Gephyrocharax atracaudatus (Meek & Hildebrand 1912), Corynopoma riisei Gill 1858 and Pseudocorynopoma doriae Perugia 1891] also reproduce during colder months or have unseasonal and extended reproductive periods (Kramer, ; Winemiller, ; Menni & Almirón, ; Ferriz et al ., ). A possible advantage of this reproductive strategy is that the females are always ready to spawn when the environmental conditions become beneficial for the offspring, and in the absence of males (Burns et al ., ; Azevedo et al ., ; Burns & Weitzman, ).…”

Reproductive biology of gray-eel catfish, Plotosus canius, in the coastal waters of Port Dickson, Peninsular Malaysia

“…Kamrani et al (2010) observed predominance of males over females in the blue swimmer crab, Portunus pelagicus. However, the predominance of females was reported in catfish, Liposarcus multiradiatus (Liang et al, 2005), Pseudocorynopoma doriai (Ferriz et al, 2007), Acetes indicus (Amin et al, 2009), Liza abu (Chelemal et al, 2009), Rasbora tawarensis (Muchlisin et al, 2010), Mystus tengara (Gupta and Banerjee, 2013). The sex ratio can also differ from one population of the same species to another, and may also vary year to year (Gupta and Gupta, 2006;Wang et al, 2003).…”

Spatio-temporal variability in reproductive ecology of sand flathead,Platycephalus bassensis, in three Tasmanian inshore habitats: potential implications for management

“…In serial spawners, yolked oocytes are repeatedly recruited from unyolked oocytes over the spawning season (DeVlaming, 1983), therefore, a longer spawning period will result in more batches of spawned eggs compared to a shorter spawning period. Additionally, given the positive correlation between fecundity and fish size (Ferriz et al., 2007), a larger fish with greater gonad volume is expected to make a greater contribution to population egg production than its smaller counterpart. The result of such variability in egg production may result in the capacity for variations in population growth.…”