Article
Biochemistry & Molecular Biology
Joanne E. Littlefair, Michael D. Rennie, Melania E. Cristescu
Summary: This study evaluates the potential of environmental RNA (eRNA) released by macroeukaryotes as a biomonitoring tool. The results show that eRNA can be filtered from water and reliably provide species composition information through metabarcoding analysis. Compared to eDNA, eRNA has a higher true positive rate, making it a promising addition to the suite of molecular monitoring tools.
MOLECULAR ECOLOGY RESOURCES
(2022)
Article
Fisheries
Luana Rodrigues Vieira, Yago Luiz Gonsalves Pereira, Laura Andrade Diniz, Chirlene Pinheiro Nascimento, Alex Luiz Mendesda Silva, Julianne Elba Cunha Azevedo, Vanessa Joia de Mello, Nilton Akio Muto, Luis Andre Luz Barbas, Moises Hamoy
Summary: The study investigated the behavior and physiological responses of tambaqui fish (C. macropomum) to different concentrations of lidocaine hydrochloride in immersion baths and after transfer to anesthetic-free water. The results showed that the fish exhibited loss of the righting reflex and significant muscle relaxation upon exposure to lidocaine hydrochloride. Higher concentrations also caused a decreased heart rate and altered T wave tracing. However, the reversible nature of these responses suggests that lidocaine hydrochloride can be safely used as an alternative anesthetic for tambaqui fish.
Article
Marine & Freshwater Biology
Erivaldo Baia, Marcelo Rollnic, Virag Venekey
Summary: The study analyzed the effects of seasonal variation in rainfall and saline intrusion on meiofauna/nematodes diversity and abundance on a mesotidal beach located in the mixing zone of an Amazon estuary. The results showed that density variation in meiofauna community had a direct relationship with increased rainfall and decreased salinity. Seasonal changes in rain and salinity strongly affected meiofauna, both at the level of large groups and at the level of Nematoda genera.
JOURNAL OF SEA RESEARCH
(2021)
Article
Parasitology
Elvis Silva Lima, Marcos Sidney Brito Oliveira, Marcos Tavares-Dias
Summary: This study investigated the influence of temporal and seasonal variations on the communities and infracommunities of metazoan parasites in a specific fish species from the Amazon River. The results showed differences in parasite distributions between years and seasonal periods, but overall effects were weaker than expected.
PARASITOLOGY RESEARCH
(2022)
Article
Environmental Sciences
Savio Jose Filgueiras Ferreira, Sebastien Pinel, Eduardo Antonio Rios-Villamizar, Sebastiao Atila Fonseca Miranda, Domitila Pascoaloto, Ana Rosa Tundis Vital, Maria Terezinha Ferreira Monteiro, Maria do Socorro Rocha da Silva, Thais Rivera Brandao da Cunha, Almir Salgado dos Santos, Steffen Bender, Hillandia Brandao da Cunha
Summary: The study revealed that peri-urban activities have no significant impact on water quality, while urban activities significantly alter water quality indicators, leading to higher alkalinity, mineralization, turbidity, suspended materials, biochemical and chemical oxygen demands, and lower acidity and dissolved oxygen levels. Urban areas also experience a disruption in the natural seasonal patterns of water quality, with changes in alkalinity, mineralization, turbidity, and other indicators during wet season due to increased rainfall and human activities.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Ecology
Lais Salgueiro, Fernanda A. S. Cassemiro, James S. Albert, Renata G. Frederico, Max Hidalgo, Bernard Hugueny, Celine Jezequel, Hernan Ortega, Pablo A. Tedesco, Gislene Torrente-Vilara, Jansen Zuanon, Thierry Oberdorff, Murilo S. Dias
Summary: By evaluating the phylogenetic diversity patterns of fish assemblages in 97 sub-drainages of the Amazon River basin, it was found that elevation gradients, contemporary climate, and water types have significant effects. Additionally, there was a significant West-East decline in sub-drainage assemblages phylogenetic clustering, indicating deeper evolutionary divergences among taxa located to the East and more recent radiations in the Western sub-drainages.
JOURNAL OF BIOGEOGRAPHY
(2022)
Article
Fisheries
Gregory M. Weber, Kyle E. Martin, Yniv Palti, Sixin Liu, Joseph N. Beach, Jill E. Birkett
Summary: Rainbow trout lines with different spawning seasons were crossed to study the impact on spawning date and gamete characteristics of offspring. The hybrid progeny showed a later spawning date and exhibited a classic phenotypic distribution pattern of heterozygous F1 hybrids. The study provides valuable information for hatchery production of year-round seedstock and genetic analysis of spawning date in rainbow trout.
AQUACULTURE REPORTS
(2023)
Article
Environmental Sciences
Sara Packull-McCormick, Alicia Cowan, Ken D. Stark, Mike Low, Mary Gamberg, Heidi Swanson, Brian Laird
Summary: Indigenous communities in northern Canada rely on locally harvested traditional foods, including fish, which provides them with nutritional, cultural, and social benefits. However, mercury exposure from fish consumption can pose a health risk for populations that consume large amounts of fish with elevated mercury concentrations. This study examined mercury bioaccessibility in freshwater fish species and found significant differences in total mercury bioaccessibility among fish species and lakes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Joana Garrido Nogueira, Manuel Lopes-Lima, Pedro Beja, Ana Filipa Filipe, Elsa Froufe, Duarte Goncalves, Janine P. da Silva, Ronaldo Sousa, Amilcar Teixeira, Simone Varandas, Virgilio Hermoso
Summary: Understanding biotic interactions is crucial for species distribution, ecosystem functioning, and conservation efforts. This study presents a new framework to incorporate biotic interactions into conservation planning using freshwater mussels and fish interaction as a case study. Results show that considering both freshwater mussels and fishes in spatial prioritisation is necessary to accurately represent biotic interactions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biodiversity Conservation
Chris Brimacombe, Korryn Bodner, Marie-Josee Fortin
Summary: Research has shown that in stream fish communities, seasonality primarily influences species interactions through rewiring rather than species turnover, with fish trophic status and species length significantly impacting the number of rewiring interactions. This suggests that rewiring may be a key process in stream fish communities experiencing seasonal environments.
Article
Environmental Sciences
Leandro Castello
Summary: The Amazon Basin's freshwater ecosystems are facing unprecedented degradation, with conservation efforts primarily focused on terrestrial ecosystems. To address this imbalance, increased information exchange among stakeholders is needed to raise awareness of threats to freshwater ecosystems and promote conservation efforts.
AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS
(2021)
Article
Environmental Sciences
Sampan Tongnunui, Treerat Sooksawat, Charoonroj Chotwiwatthanakun, Weerayuth Supiwong, Amnuay Wattanakornsiri, F. W. H. Beamish
Summary: Seasonal change affects the Critical thermal maximum (CTmax) of riverine fishes, with lower thermal tolerance in the wet season and higher tolerance in the dry season. The variations in CTmax for the four studied fish species can be attributed to their seasonal plasticity in response to thermal stress. R. caudimaculata and M. chilopterus show higher capacities to tolerate heat stress across both wet and dry seasons.
Article
Environmental Sciences
Nahid Sultana, Rafsana Rahman Tista, Muhammad Saiful Islam, Mahmuda Begum, Shanzida Islam, M. Niamul Naser
Summary: This study evaluated the incidence of microplastic contamination in freshwater fish, showing that both wild and farmed fish were affected. There were significant differences in microplastic count among different fish species, with polyethylene being the most common polymer observed. This study is the first to report plastic pollution in freshwater fishes of Bangladesh from wild and farmed sources.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Biodiversity Conservation
Sam Wenaas Perrin, Bert van der Veen, Nick Golding, Anders Gravbrot Finstad
Summary: Estimating changes in community composition through Species Distribution Models is important for managing the impacts of global climate change on species distributions. This study focused on freshwater ecosystems and found a trend of associations between species based on their temperature tolerances, with warmer-tolerant species dominating future community compositions. The model implemented provides a starting point for understanding climate-driven community trends and potential local extinctions.
GLOBAL CHANGE BIOLOGY
(2022)
Article
Multidisciplinary Sciences
Alexander S. Flecker, Qinru Shi, Rafael M. Almeida, Hector Angarita, Jonathan M. Gomes-Selman, Roosevelt Garcia-Villacorta, Suresh A. Sethi, Steven A. Thomas, N. LeRoy Poff, Bruce R. Forsberg, Sebastian A. Heilpern, Stephen K. Hamilton, Jorge D. Abad, Elizabeth P. Anderson, Nathan Barros, Isabel Carolina Bernal, Richard Bernstein, Carlos M. Canas, Olivier Dangles, Andrea C. Encalada, Ayan S. Fleischmann, Michael Goulding, Jonathan Higgins, Celine Jezequel, Erin Larson, Peter B. McIntyre, John M. Melack, Mariana Montoya, Thierry Oberdorff, Rodrigo Paiva, Guillaume Perez, Brendan H. Rappazzo, Scott Steinschneider, Sandra Torres, Mariana Varese, M. Todd Walter, Xiaojian Wu, Yexiang Xue, Xavier E. Zapata-Rios, Carla P. Gomes
Summary: The proposed hydropower dams in the Amazon region require strategic evaluation due to the various ecosystem services provided by the river basin. Using multiobjective optimization, this study identifies portfolios of sites that minimize impacts on different aspects while achieving energy production goals. The uncoordinated dam-by-dam expansion has led to the loss of ecosystem service benefits, highlighting the importance of considering diverse environmental impacts and cooperation among Amazonian nations.
Article
Fisheries
Carolina Mercedes Laurent Singh, Jamerson Aguiar-Santos, Efrem Jorge Gondim Ferreira, Eucaris del Carmen Evaristo, Carlos Edwar de Carvalho Freitas
MARINE AND COASTAL FISHERIES
(2020)
Article
Fisheries
Poliane B. Silva, Caroline C. Arantes, Carlos E. C. Freitas, Miguel Petrere, Frank R. V. Ribeiro
Summary: The study found that the taxonomic and functional structures of fish assemblages in the lower Amazon River floodplain are influenced by seasonal hydrological variations and local environmental and landscape variables. During high-water periods, piscivores, planktivores, and omnivores with periodic and intermediate life history strategies dominate, while during low-water periods, herbivores, invertivores, and detritivores with large body size and equilibrium life history strategies dominate.
ECOLOGY OF FRESHWATER FISH
(2021)
Article
Fisheries
C. C. F. Lubich, J. Aguiar-Santos, C. E. C. Freitas, F. K. Siqueira-Souza
Summary: This study estimated the length-weight relationship parameters for 16 freshwater fish species from two tributaries of the Negro River in the Amazonas state of Brazil. New data on maximum lengths for six species were also provided in the study.
JOURNAL OF APPLIED ICHTHYOLOGY
(2021)
Article
Ecology
Cristhiana Ropke, Tiago H. S. Pires, Jansen Zuanon, Carlos E. C. Freitas, Marina C. Hernandes, Flavia Souza, Sidineia Amadio
Summary: Understanding the factors that regulate temporal changes in population size is crucial in ecology for maintaining species interactions, ecosystem stability, and biodiversity conservation. This study examined the population stability of 70 Amazonian floodplain fish species in relation to life-history traits and fishing pressure, finding significant relationships with certain life-history traits but not with fishing pressure. The findings stress the importance of life-history traits in controlling population size variation and can inform fisheries and conservation management strategies.
FRESHWATER BIOLOGY
(2021)
Article
Fisheries
Chiara C. F. Lubich, Daniel Olentino, Carlos E. de C. Freitas, Kedma C. Yamamoto
Summary: This study estimated the parameters of the length-weight relationship for 12 freshwater fish species inhabiting lakes in the Negro River basin in Brazil. The study utilized gillnets for sampling and provided new data on the maximum lengths for three of the species.
JOURNAL OF APPLIED ICHTHYOLOGY
(2021)
Article
Fisheries
Chiara C. F. Lubich, Andre R. Martins, Carlos E. C. Freitas, Lawrence E. Hurd, Flavia K. Siqueira-Souza
Summary: This study reports the first observation of Amazonian vampire catfish Paracanthopoma sp. attached to the body surface of a thorny catfish Doras phlyzakion, indicating a potentially protective or phoretic association rather than feeding between the two species, suggesting a more complex interaction than previously understood.
ACTA ICHTHYOLOGICA ET PISCATORIA
(2021)
Article
Fisheries
Chiara Lubich, Caroline Campos, Carlos Freitas, Flavia Siqueira-Souza
Summary: The study shows that fishing activities have a significant impact on the size structure and mean length of the Speckled Pavon population, with an increasing fishing intensity leading to a decrease in average length. Furthermore, fishing grounds further from the municipality are more likely to catch larger individuals, resulting in increased yield, while an increase in the number of fishers leads to a decrease in average size and yield.
TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY
(2021)
Article
Fisheries
Jamerson Aguiar-Santos, Pieter A. P. DeHart, Bruce R. Forsberg, Carlos E. C. Freitas
Summary: This study examines the downstream effects of damming on the isotopic niche of peacock bass in the Uatuma River. The results show that the damming increased the niche width and altered the carbon energy sources of peacock bass, despite their higher trophic position.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Multidisciplinary Sciences
Caroline Pereira Campos, Sandro Dimy Barbosa Bitar, Carlos Freitas
Summary: The increase in temperature from global climate change has a direct impact on fish survival and population parameters such as natural mortality (M). Estimating this parameter and understanding the uncertainties in its estimates are significant challenges in fish stock evaluation studies. The fuzzy set theory was employed to evaluate the effects of temperature increase on natural mortality of fish considering different life strategies. The model revealed that temperature increase resulted in increased uncertainties in M estimates across all species, regardless of life strategy. However, opportunistic species exhibited greater uncertainties in M estimates compared to equilibrium species. The identified patterns in M uncertainties associated with species groupings by life strategies can aid in holistic approaches for assessing and managing recently exploited or data-limited fisheries resources.
Article
Fisheries
Chiara Lubich, Flavia Siqueira-Souza, Carlos Freitas
Summary: This study aimed to describe sport fishing in the middle Negro River region. Data was collected through semi-structured questionnaires given to sport fishing operators and fishers, and analyzed using descriptive statistics. Of the 142 questionnaires applied, results showed that the majority of operators were male (97.62%) with ages ranging from 24 to 57 years old (mean of 44.09 ± 10.14 years old). The average season duration was six months, during which companies offered five different types of fishing tourism. Boat-hotels were the most commonly used form of accommodation, and transportation for fishing trips mainly used semi-flat-nosed boats with 30-hp engines. Fishing operations varied depending on the type of operation, with trips lasting seven days and six fishing days. Twenty-two rivers were identified as fishing locations, with the Araca, Demeni, and Cuiuni Rivers being the most used.
BOLETIM DO INSTITUTO DE PESCA
(2023)
Review
Fisheries
Chiara Lubich, Flavia Siqueira-Souza, Carlos Freitas
Summary: This study provides a systematic review of sport fishing in Brazil, highlighting an increase in the number of published papers since the 1990s, mainly from the South-Eastern region of the country. Most of the studies focused on sport fishing in marine environments and discussed fishing practices and fishers. However, the majority of the papers only addressed the ecological aspect of sustainability. The study also identified 330 species of marine and freshwater fish that are of interest to sport fishers in Brazil.
BOLETIM DO INSTITUTO DE PESCA
(2023)
Article
Fisheries
Giulia Cristina dos Santos Lopes, Ferreira de Matos, Diego Valente Pereira, Carlos Edwar de Carvalho Freitas
Summary: This study assessed the closed season compensation payment from 2016 to 2020, revealing that the states of Para and Maranhao received the highest amount of compensation. The number of fishers also increased during this period. The closed season is an important management tool that requires effective supervision to prevent infringements.
BOLETIM DO INSTITUTO DE PESCA
(2022)
Article
Zoology
Neiliane N. Soares, Pieter A. P. DeHart, Bruce G. Marshall, Marc Pouilly, Ana C. B. Oliveira, Marcia R. F. M. Bussons, Carlos E. C. Freitas, Kedma C. Yamamoto
Summary: The study found that Semaprochilodus insignis has different diets in different rivers, likely due to migratory movements at different life stages and hydrological periods. Adults mainly feed on periphyton, while juveniles predominantly consume terrestrial plants and phytoplankton.
NEOTROPICAL ICHTHYOLOGY
(2021)
Article
Zoology
Marcos A. Mereles, Raniere G. C. Sousa, Lorenzo S. A. Barroco, Caroline P. Campos, Marc Pouilly, Carlos E. C. Freitas
Summary: The study demonstrates the ability to differentiate among Cichla temensis, C. monoculus, and C. orinocensis species based on otolith morphology. Additionally, differences were found within populations of C. temensis from the Negro and Jatapu Rivers. More research is needed to understand the genetic, environmental, and biotic factors influencing the discrimination observed in otoliths.
NEOTROPICAL ICHTHYOLOGY
(2021)
Article
Zoology
Igor D. Costa, Natalia N. Santos Nunes, Carlos E. C. Freitas
Summary: The study focused on fish assemblages in the Taruma River within the Jaru Biological Reserve in Rondonia, Amazonia. The research found that the species composition of fish was influenced by dissolved oxygen and temperature, with different dominant species during high water and low water seasons.
NEOTROPICAL ICHTHYOLOGY
(2021)