<b>Feeding habits and behaviour of <I>Bagre bagre</I> and <I>Genidens barbus</I>, two ariid catfishes (Pisces: Siluriformes) from southeastern Brazil</b>

Abstract

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Isotopic niche of the catfishes Bagre bagre and Genidens barbus in a coastal area of south-eastern Brazil

“…All prey species recorded in the stomach contents of these catfishes are bottom-associated resources and common year-round along the coast of northern Rio de Janeiro State (Gomes et al 2003, Fernandes et al 2011, Tavares & Di Beneditto 2017. Thus, the local availability of these prey to the consumers is high.…”

“…Isotopic mixing models can have caveats when food items with similar isotopic values are included; however, Phillips et al (2014) argued that when results of previous dietary studies are combined with isotopic approach the models are more powerful and the bias in data interpretation is reduced. Here, the previous description about the local feeding habits of B. bagre and G. barbus guided the isotope mixing models (Tavares & Di Beneditto 2017). Once the food items have been identified, stable isotope mixing models are consistent approaches to quantify the food assimilation (Phillips et al 2014).…”

“…Previous investigation about the local feeding habits of these catfishes done by Tavares & Di Beneditto (2017) guided the prey species selection for the present study. The prey species identified in the stomach contents of B. bagre were the fish T. lepturus (most frequent prey), Gymnothorax ocellatus (Agassiz 1831), Paralonchurus brasiliensis (Steindachner 1875) and the shrimp X. kroyeri.…”

“…Tavares & Di Beneditto (2017) investigated the feeding habits of adult specimens of Bagre bagre (Linnaeus 1766) and Genidens barbus (Lacépède 1803) in northern Rio de Janeiro State, south-eastern Brazil. Both consumers are carnivorous with differences in feeding preference: the fish Trichiurus lepturus (Linnaeus 1758) and the shrimp Xiphopenaeus kroyeri (Heller 1862) were the most frequent prey species in the stomach contents of B. bagre and G. barbus, respectively.…”

The trophic ecology of marine catfishes in south-eastern Brazil

“…Along the coast of São Paulo and Rio de Janeiro, their spatial distribution in estuarine systems is governed by salinity (Bizerril, 1999; Denadai et al ., 2012). They usually have wide trophic niches that, in general, overlap with each other's (Bruton, 1996; Denadai et al ., 2012) as many other sympatric fish species (Svanbäck et al ., 2015; Cachera et al ., 2017), and have been classified as generalist opportunistic omnivorous predators, with crustaceans, fishes, molluscs, annelids, detritus and algae commonly observed as the main groups of food items (Chaves & Vendel, 1996; Denadai et al ., 2012; Pinheiro-Sousa et al ., 2015; Tavares & Di Beneditto, 2017; Di Beneditto et al ., 2018; Di Beneditto & Tavares, 2019).…”