Atlas of Fish of Tapajós and Negro Rivers I: Characiformes

Silvano, Renato Azevedo Matias; Nitschke, Pedro Peixoto; Vieira, Kaluan C.; Nagl, Paula; Martínez, Astrid T. R.; Chuctaya, Junior; Dutra, Márcia C. F.; Keppeler, Friedrich W.; Rowedder, Anaís Rebeca Prestes; Andrade, Marcelo C.

doi:10.1007/978-3-030-49146-8_4

Cited by 3 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, the decrease was not so accentuated, as the actual median size (43.5 cm) according to fishers, corresponded to a 16% decrease compared to the median size of 51.5 cm reported for 20 years ago (Figure 3). The biological literature reports maximum lengths of 52 cm for Cichla pinima and 74 cm for Cichla ocellaris [73,74], which are the two most common species of Peacock bass found in the studied regions [62]. These values are within the range of sizes reported by fishers, who also mentioned larger sizes of Peacock bass being caught.…”

Section: Interviews: New Data On Past Situationssupporting

confidence: 76%

“…According to these studies, the ichthyofauna of the Tapajos River basin includes approximately 982 species [61]. During our previous research in the Lower Tapajos River, we sampled a total of 147 fish species, and 46 species or groups of species that are regularly caught by fishers [62,63]. Fisheries in the studied communities in the Tapajos River are essentially small-scale, providing an important role in food security and income [60].…”

Section: Methodsmentioning

confidence: 99%

“…During the interviews, we showed photographs of fish to interviewees to identify species. We also sampled fish using gillnets in the Tapajos River and organized a database with photographs of fish, which were compared to common names provided by fishers during the interviews and when recording fish landings [62]. However, sometimes fishers apply one common name for more than one species, thus some names refer to groups of fish species.…”

Section: Quantitative Interviewsmentioning

confidence: 99%

“…These data on length-frequency would be difficult to obtain through biological sampling alone. For example, a review of several species of Peacock bass (genus Cichla) reports measures for 49 individuals of Cichla pinima and 34 individuals of Cichla ocellaris [73], and our own biological sampling in the Tapajos River brings measurement data for 38 individuals of Cichla pinima and 18 individuals of Cichla ocellaris [62]. A limitation of the length data from fisheries monitoring is that this information has to be applied at the genus level (Cichla), as these data possibly refer to more than one species of Peacock bass.…”

Section: Fisheries Monitoringmentioning

confidence: 99%

See 3 more Smart Citations

Participatory Research with Fishers to Improve Knowledge on Small-Scale Fisheries in Tropical Rivers

Silvano

Hallwass

2020

Sustainability

View full text Add to dashboard Cite

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 and describe participatory research methods used in studies with fishers in the Tapajos River, a poorly known tropical river in the Brazilian Amazon. We address three interview approaches, two ways to do fisheries monitoring and two approaches for georeferenced mapping based on fishers’ knowledge, which can provide data about at least 16 topics related to fisheries. We highlight major advantages and shortcomings of these methods and illustrate their potential with examples of results on fisheries and fish biology of Peacock bass (Cichla spp. tucunaré in Brazil), an important commercial fish in the Brazilian Amazon. The interviews, participatory monitoring and mapping revealed which fish are more valued by local communities, how fish abundance and sizes varied over time, when fish are more often caught and show reproductive activity, and which sites or habitats fish need to reproduce. In addition to providing useful data from many sites in a cost-effective way, participatory methods can bring the additional benefit of including local stakeholders in the monitoring, management, and research activities.

show abstract

Section: Interviews: New Data On Past Situationssupporting

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Quantitative Interviewsmentioning

confidence: 99%

Section: Fisheries Monitoringmentioning

confidence: 99%

See 2 more Smart Citations

Participatory Research with Fishers to Improve Knowledge on Small-Scale Fisheries in Tropical Rivers

Silvano

Hallwass

2020

Sustainability

View full text Add to dashboard Cite

show abstract

“…Economic Importance Species not relevant to fisheries due to small size (Silvano et al, 2020). Inhabits both highland and lowland habitats (Sidlauskas et al, 2005).…”

Section: Bryconops (Creatochanes) Melanurus Bloch 1794mentioning

confidence: 99%

Body Shape Variation in the Bryconops Melanurus Complex (Characiformes: Iguanodectidae) Using Traditional and Geometric Morphometrics

Kohn¹

View full text Add to dashboard Cite

We cannot protect what we do not know. Species-level diversity of the freshwater tetra Bryconops melanurus is underestimated and still relatively unknown. A greater level of understanding of species distribution within the genus Bryconops and species-level diversity of B. melanurus will allow for more data driven and effective conservation management decisions. Although there is literature on B. melanurus, there has not been a thorough examination of morphometrics and patterns of body shape differences. This thesis analyzes the effects of geographic variation on body shape within the melanurus species-group across South America using modern techniques of morphometrics. Relative warp analysis (RWA) of 14 landmarks and principal component analysis (PCA) of 28 interlandmark distances formed the basis of this study. 554 specimens were examined from a total of 59 localities in South America. Specimen were examined from 16 river basins. Results suggest that within river-basin populations, variation in shape is proportional to sample size. However, despite this limitation, the study identifies the presence of a possible new species of Bryconops in the Pantanal (Bryconops cf. melanurus), as well as redescribes B. melanurus.

show abstract

Risk Assessment of Mercury-Contaminated Fish Consumption in the Brazilian Amazon: An Ecological Study

Basta,

de Vasconcellos,

Hallwass

et al. 2023

Toxics

View full text Add to dashboard Cite

Mercury is one of the most dangerous contaminants on the planet. In recent years, evidence of mercury contamination in the Amazon has significantly increased, notably due to gold-mining activities. Although mercury contamination in fish has consistently been documented, little is known about the risk associated with fish consumption by populations in urban areas of the Amazon. We sampled 1010 fish sold in public markets in six state capitals and 11 additional cities. Mercury levels were determined for each specimen, and the evaluation of the health risks associated with consuming mercury-contaminated fish was conducted according to the methodology proposed by the World Health Organization (WHO). Our study reveals that more than one-fifth (21.3%) of the fish sold in urban centers had mercury levels above the safe limits (≥0.5 µg/g) established by the Brazilian Health Surveillance Agency (ANVISA). The prevalence of Hg contamination ≥0.5 µg/g was approximately 14 times higher in carnivorous than in noncarnivorous fish. The analysis of the risk attributable to fish consumption reveals that daily mercury intake exceeded the reference dose recommended by the U.S. EPA in all population groups analyzed, reaching up to 7 and 31 times in women of childbearing age and children from 2 to 4 years old, respectively. However, these risks are diverse depending on the type of fish consumed and must be considered to formulate appropriate nutritional guidelines for safe fish consumption by the local community.

show abstract

Atlas of Fish of Tapajós and Negro Rivers I: Characiformes

Cited by 3 publications

References 32 publications

Participatory Research with Fishers to Improve Knowledge on Small-Scale Fisheries in Tropical Rivers

Participatory Research with Fishers to Improve Knowledge on Small-Scale Fisheries in Tropical Rivers

Body Shape Variation in the Bryconops Melanurus Complex (Characiformes: Iguanodectidae) Using Traditional and Geometric Morphometrics

Risk Assessment of Mercury-Contaminated Fish Consumption in the Brazilian Amazon: An Ecological Study

Contact Info

Product

Resources

About