<b>Aspects of the feeding and population structure of Leporinus piau Fowler, 1941 (Actinopterygii, Characiformes, Anostomidae) of Taperoá II Dam, semi arid region of Paraíba, Brazil</b><br>doi: 10.5007/2175-7925.2010v23n2p101

Abstract

ResumoAspectos da estrutura populacional e alimentar de Leporinus piau Fowler, 1941 (Actinopterygii, Characiformes, Anostomidae) do Açude Taperoá II, na região do semi-árido da Paraíba, Brasil. Objetivouse determinar a estrutura populacional, estabelecer a relação peso-comprimento, a proporção sexual, a relação entre a atividade alimentar e o período reprodutivo, e identificar a dieta e o regime alimentar de Leporinus piau. Foram realizadas seis coletas, nos meses de outubro e dezembro de 2005; março, junho, agosto e outubro de 2006, utilizando-se tarrafas, redes de espera e arrasto. Alguns exemplares foram enviados à Coleção Ictiológica da UFPB. Foram coletados 89 indivíduos de comprimentos que variaram de 6,2cm a 22,0cm. O crescimento foi do tipo alométrico negativo. Houve um predomínio significativo de machos. A dieta alimentar de L. piau se mostrou variada, sugerindo onivoria e oportunismo.Unitermos: alimentação, Anostomidae, dinâmica populacional, ictiofauna, semi-árido AbstractThe aim of this research was to determine the population structure, weight-length relationship and sexual ratio of Leporinus piau. It also attempted to evaluate the relationship between the alimentary activity and the reproductive period, and to identify the diet and alimentary regimen. Six collections were made in the months of October and December of 2005 and March, June, August and October of 2006, using casting, seining and gill nets. Some specimens were sent to the UFPB Ichthyological Collection. The 89 collected individuals presented lengths varying from 6.2cm to 22cm. The growth of the species was of the negative allometric type. There was a significant predominance of males. The alimentary diet of L. piau was apparently variable, suggesting omnivorousness.

Diet and ecomorphology of Leporinus reticulatus (Characiformes: Anostomidae) from the upper Rio Juruena, MT, Brazil: ontogenetic shifts related to the feeding ecology

“…The presence of animal and vegetal sources in the diet of Leporinus reticulatus indicates its omnivory, as suggested by Goulding (1980) for the genus, agreeing with studies on other Leporinus species (Hahn et al 1998;Albrechet and PellegriniCaramaschi 2003;Montenegro et al 2010). However, trends to herbivory and invertivory are also reported (Balassa et al 2004;Melo and Röpke 2004;Mendonça et al 2004).…”

“…The feeding habits of Leporinus are generally related to the bottom (Albrecht and Pellegrini-Caramaschi 2003; Mendonça et al 2004;Montenegro et al 2010), and L. reticulatus is no exception to this observation. Dietary items, such as chironomids and caddisflies, nematodes, shelled amebas, benthic cladocerans, filamentous algae, and the presence of sediment in the stomachs point to its behavior of catching food at the bottom.…”

Continental ichthyofauna from the Paraíba do Norte River basin pre-transposition of the São Francisco River, Northeastern Brazil

“…Taxonomical studies related to freshwater fishes from Paraíba do Norte River basin are restricted to list of species from reservoirs such as those of Marinho et al (2006), Montenegro et al (2012) and Costa et al (2017). Other studies are focused on ecological populational dynamics and communities, including those of Medeiros & Maltchik (2001), Montenegro et al (2010), Montenegro et al (2011), and Costa (2015). Studies on the taxonomy and systematics of freshwater fishes from Paraíba do Norte River basin is scarce.…”

Feeding patterns, trophic structure and damming rivers effect: studies applied in freshwater environments in the Brazilian semi-arid region

“…Thus, to overcome the periods of water scarcity, reservoirs were built to store water in the rainy season for human consumption (Vieira et al 2010). These reservoirs suffer a deficit in their water bodies, associated with low rainfall, long periods of drought and high evaporation rates, being able to change from completely dry to overflowing (Montenegro et al 2010). These changes influence in the life cycle of the species, especially in fish feeding, through fluctuations in the abundance of food resources throughout the year .…”