Population structure and somatic indexes of Hypostomus cf. ancistroides (Siluriformes, Loricariidae) collected from the Bonito river, Ivaí river basin, Turvo, Paraná

Abstract

ABSTRACT

Population structure and reproductive biology of Loricariichthys melanocheilus Reis & Pereira, 2000 (Siluriformes: Loricariidae) in the rio Ibicuí, Brazil

“…The values for GSI also began to rise in August/September, peaking in October/November for females and August/September for males. Similar results were found in other Loricariidae in various regions of Brazil, for example, Rhinelepis aspera (Agostinho et al, 1990), Hypostomus commersonii (Agostinho et al, 1991), H. ancistroides (Viana et al, 2008), Rineloricaria latirostris (Barbieri, 1994), Loricariichthys platymetopon (Bailly et al, 2011;Marcucci et al, 2005), L. spixii (Duarte et al, 2007), among others. Males showed distinctly greater condition factor than that of females throughout the study period, probably because of higher energy expenditure of females during the maturation process (Cantanhêde et al, 2007), a feature also reported by Agostinho et al (1990) for Rhinelepis aspera in the rio Paranapanema (state of Paraná).…”

“…According to the allometric coefficient obtained in the present study, this species has a positive allometric growth and a greater increase in weight than in length along its development. This pattern was not found for some species of the family Loricariidae; isometric growth was found for Rhinelepis aspera (Agostinho et al, 1990) and Hypostomus ancistroides (Viana et al, 2008), while highly negative allometric growth was observed for Pareiorhina rudolphi (Braga et al, 2009). However, the allometric coefficient appears to be also associated with the body shape of a given species .…”

“…Some researchers have established relationships between hepatosomatic index and reproductive cycles of several species (Agostinho et al, 1990;Querol et al, 2002;Andrade et al, 2003;Costa et al, 2005;Cantanhêde et al, 2007;Viana et al, 2008). According to Agostinho et al (1990), gonad maturity and reproductive activity imply the use of materials obtained from ingested food and mostly from energy reserves deposited in different parts of the body.…”

“…Studies addressing population and reproductive aspects of this family of fish have been conducted in several Brazilian basins, focusing on several species such as Rhinelepis aspera Spix & Agassiz, 1829 (Agostinho et al, 1987;Agostinho et al, 1990), Hypostomus commersonii Valenciennes, 1836 (Agostinho et al, 1991), Rineloricaria latirostris (Boulenger, 1900) (Barbieri, 1994), Hypostomus ancistroides (Ihering, 1911) (Viana et al, 2008), Pareiorhina rudolphi (Miranda Ribeiro, 1911) (Braga et al, 2009), among others. Studies conducted on the genus Loricariichthys have focused primarily on L. anus (Valenciennes, 1835), L. platymetopon Isbrücker & Nijssen, 1979(Tos et al, 1997Querol et al, 2002;Marcucci et al, 2005;Bailly et al, 2011) and L. spixii (Steindachner 1881) (Duarte & Araújo, 2001).…”

Estrutura da ictiofauna do rio Bonito, bacia hidrográfica do rio Ivaí, sistema alto rio Paraná, Brasil

“…O rio Bonito está inserido nas unidades geológicas de formação da Serra Geral, Pirambóia, Botucatu e Formação Rio do Rastro. Seu curso corre no sentido leste do município de Turvo e desemboca ao norte, na margem esquerda do rio Ivaí (Viana et al 2008).O rio Bonito apresenta na maior parte de seu curso ambientes de correnteza rápida a moderada, com profundidade média próxima a 1,5 m, alternado por remansos e poções com profundidades um pouco superiores. O substrato do rio é rochoso, com pouca deposição de sedimentos, na maior parte constituída de galhos, pequenos troncos e matéria particulada, predominantemente retidos nas margens.…”