'Disentangling'the advantages from gillnets in freshwater small-scale fisheries in the Brazilian Amazon

G Hallwass, FW Keppeler, LH Tomazoni-Silva… - Reviews in Fish Biology …, 2023 - Springer
Gillnets, which are frequently used in small-scale fisheries (SSF), raise concerns regarding
bycatch and conservation. This study evaluates the context of use and the potential …

Participatory research with fishers to improve knowledge on small-scale fisheries in tropical rivers

RAM Silvano, G Hallwass - Sustainability, 2020 - mdpi.com
Freshwater small-scale fisheries sustain millions of livelihoods worldwide, but a lack of
monitoring makes it difficult to check the sustainability of these fisheries. We aim to compare …

'Taking fishers' knowledge to the lab': an interdisciplinary approach to understand fish trophic relationships in the Brazilian amazon

PER Pereyra, G Hallwass, M Poesch… - Frontiers in Ecology …, 2021 - frontiersin.org
Trophic levels can be applied to describe the ecological role of organisms in food webs and
assess changes in ecosystems. Stable isotopes analysis can assist in the understanding of …

Food web modeling indicates the potential impacts of increasing deforestation and fishing pressure in the Tapajós River, Brazilian Amazon

L Capitani, R Angelini, FW Keppeler… - Regional Environmental …, 2021 - Springer
In the Tapajós River, Brazilian Amazon, fishing is an important activity, especially for low-
income riverine populations. Unfortunately, the Tapajós River fish diversity and abundance …

Fishers' knowledge indicates that collective benefits outweigh the individual costs of coexisting with dolphins

G Hallwass, PER Pereyra, KC Vieira… - Journal for Nature …, 2024 - Elsevier
Understanding interactions between small-scale fishers and endangered dolphins is crucial
for informing coexistence strategies. We investigated the perceptions and encounters of 123 …

[HTML][HTML] Fishers' knowledge on abundance and trophic interactions of the freshwater fish Plagioscion squamosissimus (Perciformes: Sciaenidae) in two Amazonian …

MCF Dutra, PER Pereyra, G Hallwass… - Neotropical …, 2023 - SciELO Brasil
Small-scale fisheries provide income and food security to local peoples around the world. In
the Brazilian Amazon, the pescada (Plagioscion squamosissimus) is among the fishes that …

Protected areas and frugivorous fish in tropical rivers: Small‐scale fisheries, conservation and ecosystem services

P Nagl, G Hallwass, LH Tomazoni‐Silva… - Aquatic …, 2021 - Wiley Online Library
Frugivorous fish provide often conflicting ecosystem services of seed dispersal and food
provisioning in tropical rivers. Fishing may reduce the size and abundance of frugivorous …

Integrating fishers' knowledge on fish use with ecological networks to assess the 'silent threat'of mercury contamination in tropical marine and freshwater fisheries

PER Pereyra, A Ospina‑Alvarez, MCF Dutra… - Environment …, 2024 - Springer
Small-scale fisheries (SSFs) are important sources of livelihood but are vulnerable to
anthropogenic environmental changes, including heavy metal pollution, such as mercury …

A new species of Geophagus (Teleostei: Cichlidae): Naming a cichlid species widely known in the aquarium hobby as 'Geophagus sp. Tapajos red head'

J Chuctaya, P Nitschke, MC Andrade… - Journal of Fish …, 2022 - Wiley Online Library
A new species of Geophagus sensu stricto is described from the Tapajos River basin, Brazil,
elevating the number of species of the genus to 21. The new species is of commercial …

A new species of Odontostilbe cope (Characiformes: Cheirodontinae) from rio Madeira basin diagnosed based on morphological and molecular data

J Chuctaya, WM Ohara… - Journal of Fish Biology, 2020 - Wiley Online Library
ABSTRACT A new species of Odontostilbe is described from the rio Jaciparaná, rio Madeira
basin, Rondônia, Brazil. Odontostilbe pacaasnovos differs from all its congeners, except O …