Alimentação de Hoplias aff malabaricus (Bloch, 1794) e Oligosarcus robustus Menezes, 1969 em uma lagoa sob influência estuarina, Pelotas, RS

Abstract

ResumoAlimentação de Hoplias aff. malabaricus (Bloch, 1794) e Oligosarcus robustus Menezes, 1969 em uma lagoa sob influência estuarina, Pelotas, RS. O objetivo do presente trabalho foi o de estudar a dieta de Hoplias aff. malabaricus e Oligosarcus robustos na Lagoa Pequena, com o intuito de avaliar a importância de organismos estuarinos na alimentação dessas espécies. Foram identificados 12 itens alimentares, sendo peixes o recurso mais frequente na dieta de ambas as espécies. Peixes eurialinos como a tainha Mugil platanus e o peixe-rei Odontesthes argentinensis foram itens comuns na dieta das duas espécies, caracterizando um comportamento oportunista por incluir na sua alimentação não apenas peixes de água doce, mas também peixes oriundos do ambiente estuarino adjacente, integrando as cadeias alimentares estuarinas e de água doce. Unitermos: dieta, peixe, carnívoro, estuário, Lagoa Pequena AbstractFeeding of Hoplias aff. malabaricus (Bloch, 1794) and Oligosarcus robustus Menezes, 1969 in a lagoon under estuarine influence, Pelotas, RS. The objective of the present paper was to study the diets of Hoplias aff. malabaricus and Oligosarcus robust in "Pequena Lagoon" and evaluate the importance of estuarine organisms in the feeding of freshwater fish. A total of twelve food categories were identified and it was established that the fish resource was the most frequent in the diet of both species. Euryhaline fish such as Mugil platanus mullets and Odontesthes argentinensis silversides were common items in the diets of these two species, which included not only freshwater fish but also euryhaline fish from the adjacent estuarine zone, integrating both resources in the food chain.

Feeding ecology and prey preferences of a piscivorous fish in the Lagoa do Peixe National Park, a Biosphere Reserve in Southern Brazil

“…The predominance of characins in the H. aff. malabaricus diet has been described by earlier studies with the species (Winemiller 1989;Bistoni Mlos et al 1995;Loureiro and Hahn 1996;Corrêa and Piedras 2009). For example, Loureiro and Hahn (1996) showed that characins were the main food of this species in the Segredo reservoir (South Brazil), and a similar finding was reported by Carvalho et al (2002) for a population inhabiting the Vermelho River in Pantanal (Central Brazil).…”

“…malabaricus, although invertebrates, especially insects, vegetation remains and organic detritus can also be found in the stomach contents of H. aff. malabaricus (Loureiro and Hahn 1996;Carvalho et al 2002;Peretti and Andrian 2008;Corrêa and Piedras 2009). Size-related diet shifts also occur, with small juveniles feeding primarily on invertebrates, while subadults and adults are piscivorous (Winemiller 1989).…”

The invasive fish Acestrorhynchus pantaneiro Menezes, 1992 in Southern Brazil: Occurrence and food niche overlap with two native species

“…O. jenynsii, however, had a more diverse diet including fish, insects, crustaceans, spiders and amphibians. Similar results were found in other food uptake studies on A. pantaneiro (Krinski, ; Meurer & Zaniboni‐Filho, ), O. robustus (Corrêa & Piedras, ; Nunes & Hartz, ) and O. jenynsii (Barros, ; Hermes‐Silva et al., ; Silveira, Benvenutti, & Moresco, ). These results were reflected in the food overlap analysis, which indicated a low overlap between O. robustus and O. jenynsii and high overlap of the former with A. pantaneiro .…”

Microplastics in gut contents of coastal freshwater fish from Río de la Plata estuary

“…Fish were identified following: Azpelicueta and Braga (1991), Lopez and Miquelarena (1991), Braga (1994), Casciotta et al (2005), Miquelarena and Menni (2005), Almirón et al (2008). Captured species in each sampling site were sorted according to their feeding habits, considering the studies on their trophic ecology (Ringuelet et al, 1967;Oliva et al, 1981;Colautti, 1997;Gealh and Hahn, 1998;Menni, 2004;Casciotta et al, 2005;Novakowski et al, 2007;Corrêa and Piedras, 2009;González Sagrario and Ferrero, 2013;Gottlieb Almeida et al, 2013;Llamazares Vegh et al, 2014). Five specimens of each trophic group were euthanized in ice, transported in coolers and preserved in freezer in the laboratory.…”