ABSTRACT The emergence of non-native species as a threat to local biodiversity is pressing concern that warrants immediate attention. Our study reports the first record fish golden dorado, Salminus brasiliensis, for Preguiças River Basin, Maranhão State, Northeastern Brazil, near Parque Nacional dos Lençóis Maranhenses (PNLM). This discovery occurred when single adult, measuring 77 cm in total length, was captured by artisanal fishers using gillnets January 2024. finding underscores...

This study aimed to estimate the parameters of length-weight relationship for 16 freshwater fish species that inhabit Aracá and Demeni Rivers, which are two tributaries Negro River (Amazonas state, Brazil). The fishes were sampled using gillnets (15 × 2 m, mesh size 30–120 mm between opposite knots), during 6 days each year, in April 2016, November 2018 2019. placed river twice day; morning (5–9 a.m.) evening p.m.), with a standardized time 4 hr. Measurements taken standard length (SL – 0.1...

Abstract The aim of this study was to analyse the trophic ecology speckled peacock bass Cichla temensis inhabiting two tributaries middle Negro River, Aracá River and Demeni River. Using an analysis stomach contents stable isotope composition (δ 15 N, δ 13 C) scales, we describe diet evaluate position subadult adult individuals. We then test whether shifts positions occurred among successive size classes sample locations. content confirmed piscivorous feeding habit species showed that preyed...

Aquatic macrophytes are the main autochthonous component of primary production in Amazon Basin. Floating meadows these plants support habitats with highly diverse animal communities. Fishes inhabiting have been assumed to use a broad range food items and compose particular web. We employed carbon (δ13C) nitrogen (δ15N) stable isotope analysis draw trophic structure trace energy flow by its levels. other animals from 18 independent macrophyte floodplain lake Solimões River (Amazonia, Brazil)...

Parameters of the length-weight relationship (LWR) were calculated for five fish species from Amazon Basin. Samplings carried out in ten lakes Solimões River floodplains during four seasons hydrological cycle: rising water, high receding and low two periods. The first period eight years included samplings performed 2001 to 2008 second sampling was 2012 2013. Specimens captured using gillnets (mesh sizes ranging 30 120 mm between opposite knots) standardized dimension 20 m length × 2 height....

As mudanças climáticas, principalmente em decorrência das ações antrópicas, têm sido causas de impactos ambientais a nível regional e global. Dentre as regiões do planeta, região Amazônica é uma mais prejudicadas pelos climáticas que se manifestado por meio eventos extremos com sérias implicações para biodiversidade rica endêmica planeta. Diante disso, o objetivo deste trabalho foi discutir os efeitos sobre peixes amazônicos. Tais induzem ao aumento da temperatura, oscilações nos níveis...

This research reports the LWR of ornamental fish from floodplain lakes Solimões River basin. The were caught in Paciência island (a fluvial island) two Sacambú and Cacau using purse seine 7 m × 4 mesh size = 3 mm, once during flood June 2017 dry January 2018. specimens captured anesthetized eugenol 15 mg · L–1, fixed formalin 10% stored ethanol 70% after 10 days. study provides parameters for species Anablepsoides micropus, Anchoviella jamesi, Cichlasoma amazonarum, Heros efasciatus,...

Amazonia is considered to host some of the more productive freshwater fisheries world, and these are key importance local population. Accordingly, fishing activity needs be studied evaluate its dynamics, so that long-term sustainability resource can assured fishing. The objective current study, therefore, was analyze seasonal spatial variation in production fish landed city Manacapuru, Central Amazonia. landing data collected daily from January December 2012 at main port Amazonas, Brazil....

Length-weight relationship parameters were calculated for six fish species from São Marcos Bay, in Northeast Brazil (the segment between 02°35′55″S and 44°20′58″W; 02°34′53″S 44°21′48″W; 02º42′25″S 44º26′46″W). The specimens caught quarterly April 2010 to February 2013, using monofilament gillnets (2, 4 6 cm knots) 100 m 3,000 long high. present study covers a much wider size range four adds new information the maximum length of Notarius bonillai.

Parameters of the length-weight relationship (LWR) were estimated for seven fish species from Amazonian Equatorial coast Maranhão, Brazil. Samplings carried out in three sample points lower stretch Itapecuru River (2°57'6.2"S and 44°14'26.5"W; 3°0'33.0"S 44°15'54.7"W; 3°3'42.9"S 44°15'1"W). The specimens caught quarterly June 2012 to August 2014 using monofilament gillnets (10, 20, 30, 40, 50, 60, 70 80 mm between knots) 10 m 30 long 4 6 high. This study provides LWR parameters Schizodon...

Abstract Although many upstream effects of a dam on the trophic ecology fish have been reported, little is known about their downstream isotopic niche Amazonian predator fish. The authors used stable isotope analysis δ 13 C and 15 N to determine damming Uatumã River width, carbon energy sources position peacock bass Cichla temensis comparing with free‐flowing river in Amazon basin, Brazil, during peak flood early falling water period 2020. They found that C. population undammed had smaller...

Length-weight relationships are valuable in fisheries biology for estimating a fish's average weight at given length, aiding predicting population conditions based on total biomass. This study presents length-weight six threatened shark species captured off the Brazilian Amazon Coast. The specimens of Carcharhinus porosus, oxyrhynchus, Rhizoprionodon Sphyrna lewini, mokarran, and tudes were caught by commercial fleets using gillnets with mesh size 95-100mm three distinct periods: from 1997...

Abstract Studies on environmental perception can contribute to managing solid waste beaches, as they elucidate the nuances of interaction between humans and environment, highlighting necessary transformations aligned with user preferences. The objective was determine socioeconomic profile users identify these actors perceptions bathers beaches Rio Negro their about incorrect disposal in environments. Interviews were conducted Ponta Negra, Lua, Tupé Paricatuba beaches. Women predominated...

Abstract The aim objective of this study was to determine the trophic ecology juvenile and adult Acestrorhynchus falcirostris during rising flood (high-water) period in six island lakes adjacent Solimões River. As such, we investigated: i) position, through fractional niche; ii) niche breadth; iii) overlap iv) food strategy species. specimens were collected years 2014 2017, using gillnets with mesh sizes ranging from 30 120mm between opposite knots. Through analysis stomach contents,...

Individual dietary specialization is one of the factors that promotes variation in resource use at individual level. Here we used stable isotope analysis multiple tissues with different turnover rates to examine degree two sub-populations predator Cichla temensis inhabiting both fragmented and undammed rivers within Uatumã River basin Amazon. Our results showed river provides better conditions promote than river. This study contributes understanding how specific life history characteristics...

Abstract An industrial multigear fishing fleet from Venezuela emerged in 2009 as a governmental strategy to reduce the impact of trawling on Venezuelan coast North Brazil Shelf Large Marine Ecosystem. The current study aimed examine spatial–temporal distribution effort and catch levels obtained by during period 2015–2018. Fishing gear types employed this order preference were follows: bottom longline (target sea catfishes [family Ariidae]), trap snappers Lutjanidae]), pelagic tunas...

Abstract We evaluated the influence of flooding and receding comparison spatial variation on composition structure fish assemblages in blackwater clearwater rivers Aracá-Demeni sub-basin middle Negro River, Amazonas state, Brazil. The collections were carried out during falling-water period (November 2018) rising-water (April 2019) using gillnets with meshes ranging from 30 to 120mm stretched mesh size. Ecological estimates richness, equitability, Shannon-Wiener diversity index,...

Auchenipterichthys punctatus é uma espécie de peixe muito abundante durante o período águas baixas no rio Cuiuni, sendo objetivo deste estudo investigar a alimentação A. em lagos desse rio. O conteúdo estomacal, grau repleção, índice alimentar (IAi), itens preferenciais e amplitude nicho trófico (B A ) 130 indivíduos foram analisados. Os resultados demonstram que 26,9% dos apresentam estômagos com enchimento baixo, 23,0% moderado, 13,0% semicheio 10,7% completamente cheio. Foi possível...