Aspectos reprodutivos do cangati, Parauchenipterus galeatus Linnaeus (Osteichthyes, Auchenipteridae) da Lagoa de Extremoz, Rio Grande do Norte, Brasil

Diet and reproductive dynamics of Trachelyopterus lucenai (Siluriformes: Auchenipteridae) in subtropical coastal lagoons in southern Brazil

“…Abiotic factors such as temperature, photoperiod and rainfall directly influence the reproductive period of fish (VAZZOLER 1996). For auchenipterids such as T. galeatus that inhabit regions with well-defined rainy and dry periods, the breeding season coincides with periods of heavy rainfall, resulting in high water levels (VAZZOLER et al 1997, MEDEIROS et al 2003. However, in the Laguna dos Patos and Tramandaí River systems, in a subtropical climate (SEELIGER et al 1997, FERRARO & HASENACK 2009, there is not a clearly defined rainy season, and therefore we assume that temperature variations are the main environmental factor initiating the reproductive period of T. lucenai.…”

Reproduction and fecundity of invader of internal insemination Trachelyopterus galeatus in a Neotropical floodplain

“…Macroscopic evaluation of the male and female gonads was done using gonadal indices to determine the spawning period of this species, which reproduces in January and February during the rainy season in Pereira de Miranda Weir in the municipality of Petecoste (Ceará State) (Silva & Viana, 2003). On the other hand, macroscopic studies of the male and female gonads carried out in Extremoz Lagoon in Rio Grande do Norte state revealed that this species reproduces in May, June and July during the rainy period (Medeiros, Chellappa, & Chellappa, 2003). However, in the Marine Extractive Reserve of Tracuateua, in the municipality of Tracuateua (Pará state), macroscopic analyses of the gonads showed that both sexes reached sexual maturity at 10.5 cm total length and reproduced during the rainy season from July to September (Sousa et al, 2016).…”

Reproduction of the duck catfish Ageneiosus ucayalensis in a ria river system

“…(b)]. This pattern found here in the Amazon Basin, has been described for catfishes from other areas, including Trachelyopterus striatulus (Steindachner 1877), Trachelyopterus galeatus (L. 1766) and Trachelyopterus lucenai Bertoletti, Pezzi da Silva & Pereira 1995 (Araújo et al ., ; Medeiros et al ., ; Maia et al ., ). This may be because, in tropical freshwater systems, fluctuations in precipitation rates constitute the principal abiotic factor affecting ecosystems, mainly due to the runoff of nutrients from terrestrial systems, contributing to the increase in feeding resources and the overall enrichment of the aquatic ecosystems during this period (Filho et al ., ).…”