Diel Variations and Ecological Aspects in Fish Assemblages of a Sandy Beach in the Semi-Arid Region of Northeast Brazil.

Abstract

For the demersal fish that inhabit sandy beaches, the variation between day and night periods represents a determinant factor in their behavior

Surf-zone fish assemblage structure and its diel variability in an ocean beach of Espírito Santo (Central Brazilian coast)

“…Our study reveals that juveniles of Menticirrhus spp., Trachinotus carolinus, T. goodie, and Polydactylus oligodon dominate the surf-zone fish fauna in the Guriri Beach. The dominance of Menticirrhus spp., T. carolinus, and T. goodie in the surf-zone nekton is a quite common pattern in the central and southeastern coast of Brazil, with such species ranking among the top five in surf fish assemblages (Gaelzer et al 2006, Gaelzer & Zalmon 2008, Félix-Hackradt et al 2010, Gondolo et al 2011, Vasconcellos et al 2011, Del-Favero & Dias 2013, 2015Monteiro-Neto & Prestrelo 2013, Dantas, et al 2016, Costa et al 2017, Santos et al 2019. On the other hand, the great abundance of P. oligodon juveniles found in the Guriri Beach is not quite a common pattern for Brazilian beaches.…”

“…it contributes disproportionately more than other locations to the recruitment of juveniles to adult populations, by providing increased food supply and reduced juvenile mortality by predation (Beck et al 2001); 2) previous surveys were carried out only during the day (e.g. Araújo et al 2008, Del-Favero & Dias 2015 when Polydactilus species appear to be less abundant in surf habitats (Gaelzer & Zalmon 2008, Dantas, et al 2016; and 3) there may have been an increased species' recruitment preceding the surveys, resulting in increased catches in our samples. Regarding dominant taxa, the fish fauna of Guriri Beach is different from that of other beaches in Espirito Santo.…”

Accidentally catching of the catfish Lophiosilurus alexandri (Steindachner, 1876) larvae in aquariums with different colors

“…In general, African catfish Clarias gariepinus have higher survival rates in the dark conditions, when larvae have a greater swimming activity and also a significantly aggressive behavior decrease (Mukai et al, 2013). Catfish usually have benthic and nocturnal habits, although many species are active during the day, especially in turbid waters (Dantas et al, 2016). African catfish larvae, C. gariepinus, subjected to total darkness have a higher survival and biomass (Adewolu et al, 2008).…”