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#IchthyofaunaChecklist - Researchers presents an inventory of the ichthyofauna from the blackwater habitats of the Coastal Plain in northern Santa Catarina, southern Brazil. In total, 30 species were recorded, representing 13 families and five orders. The authors found the entire study area is highly fragmented, with restinga remnants surrounded by urban zones and industrial infrastructure. This pattern of fragmentation reduces population connectivity, impairs gene flow, and increases the risk of local extinctions.
๐ https://t.co/zhST9Ad8o9
"The continued degradation of riparian vegetation, combined with climate change, poses an additional threat to the persistence of these communities. These findings underscore the urgent need to expand conservation actions targeting blackwater ecosystems along the southern Brazilian coastal plain."
Ichthyofauna checklists and rapid assessments are important tools for biologists, researchers, conservationists, and government bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
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Fish assemblages and endemism in blackwater aquatic habitats of the Coastal Plain in northern Santa Catarina, southern Brazil
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Dalcin, R. H., Lima, A. O. de S., Laaf, Y. de O., Ossa-Guerra, L. E. D. la ., Dallabona, J. A., Costa, V. S. C. da ., Abilhoa, V., Pinheiro, P. C., Feltrin, C. R., & Cionek, V. de M.. (2026). Fish assemblages and endemism in blackwater aquatic habitats of theCoastal Plain in northern Santa Catarina, southern Brazil. Biota Neotropica, 26(3), e20251834. https://t.co/rZIcEBzVW0
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Blackwater streams are unique environments characterized by dark, acidic, and nutrient-poor waters, supporting highly specialized aquatic communities.
This study presents an inventory of the ichthyofauna of such systems in the northern region of Santa Catarina state, based on surveys conducted between 2020 and 2024. A total of 22 sites were sampled, including perennial rivers, intermittent streams, and temporary pools, located both within and outside protected areas. In total, 30 fish species were recorded, representing 13 families and five orders. The order Characiformes showed the highest richness and was represented mainly by small-characins of the family Acestrorhamphidae. Nine species were identified as endemic to blackwater environments of the Atlantic Forest, five of which officially listed as threatened. The guppy ๐๐๐๐๐๐๐๐ ๐๐๐ก๐๐๐ข๐๐๐ก๐ was recorded for the first time in blackwater environments of the region, as well as ๐ต๐๐๐โ๐ฆโ๐ฆ๐๐๐๐๐๐ข๐ ๐๐. ๐๐๐๐๐, representing the first record of Hypopomidae (knifefish) in the region. DNA barcoding (using COI) provided molecular information, in addition to the morphological identification of 12 species, providing new local sequences for them. Results indicated a high similarity between the ichthyofauna of this region and that of blackwater streams in the southern coast of Sรฃo Paulo. Endemic and threatened species were recorded both inside and outside legally protected areas, highlighting gaps in current conservation efforts. Furthermore, intermittent streams and temporary pools proved to be critical habitats for maintaining species with extremely restricted distributions.
The continued degradation of riparian vegetation, combined with climate change, poses an additional threat to the persistence of these communities. These findings underscore the urgent need to expand conservation actions targeting blackwater ecosystems along the southern Brazilian coastal plain.
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Top left - Representative species of the order Characiformes recorded in the blackwater streams of northern Santa Catarina, Brazil. (A) Astyanax lacustris. (B) Deuterodon ribeirae. (C) Hollandichthys multifasciatus. (D) Hyphessobrycon igneus. (E) Hyphessobrycon griemi. (F) Hyphessobrycon reticulatus. (G) Oligosarcus hepsetus; (H) Psalidodon laticeps. (I) Rachoviscus crassiceps. (J) Characidium lanei. (K) Hoplias malabaricus. (L) Spintherobolus ankoseion. (M) Mimagoniates lateralis. (N) Mimagoniates microlepis. The white scale bar below each photograph corresponds to 1 cm.
Top right - Representative species of the order Cichliformes and Cyprinodontiformes recorded in the blackwater streams of northern Santa Catarina, Brazil. (A) Geophagus iporangensis. (B) Saxatilia lepidota. (C) Phalloceros cf. circummontanus (male). (D) Phalloceros cf. circummontanus (female). (E) Phalloceros spiloura (male). (F) Phalloceros spiloura (female). (G) Poecilia reticulata (male). (H) Poecilia reticulata (female). (I) Atlantirivulus haraldsiolii (male). (J) Atlantirivulus haraldsiolii (female). (K) Atlantirivulus luelingi (male). (L) Atlantirivulus luelingi (female). (M) Campellolebias chrysolineatus (male); (N) Campellolebias chrysolineatus (female). The white scale bar below each photograph corresponds to 1 cm.
Bottom - Examples of sampling sites visited during fieldwork activities. (A) Saรญ Mirim River, Itapoรก. (B) Tributary of the Saรญ Mirim River. (C) Temporary pool on the margins of the Saรญ Mirim River during the rainy season. (D) Temporary pool on the margins of the Saรญ Mirim River during the dry season. (E) Acaraรญ River, Sรฃo Francisco do Sul. (F) Tributary of the Acaraรญ River. (G) Temporary pool on the margins of the Acaraรญ River. (H) Pernambuco River, Barra do Sul. (I) Tributary of the Pernambuco River. (J) Perequรช River, Barra do Sul. (K) Tributary of the Perequรช River. (L) Temporary pool on the margins of the Perequรช River. (M) Tributary of the Itapocu River, Araquari. (N) Temporary pool on the margins of a tributary of the Itapocu River. (O) Cardoso Stream, tributary of the Itapocu River, Araquari. (P) Tributary of the Cardoso Stream.
ยฉ 2026 the Author(s). Published in the journal Biota Neotropical. An open-access article, distributed under the terms of the Creative Commons Attribution 4.0 International (CC-BY-4.0) deed. https://t.co/5IYEkz4Rwi
#Ichthyofauna #Blackwater #Ichthyology #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #FishTank #SantaCatarina #CoastalPlains #CoastalPlain #Brazil #Neotropical
#IchthyofaunaChecklist - Researchers in this study document the ichthyofauna composition in the Surabaya River, one of the most important rivers in East Java, Indonesia, recording 35 fish species across 31 genera and 17 families. Cyprinidae was the dominant family, comprising 10 genera and 11 species.
๐ https://t.co/atT8ldWZ9q
"Several species endemic of Java, such as Java walking catfishย ๐ถ๐๐๐๐๐๐ ๐๐๐ก๐๐๐โ๐ข๐ , Asian redtail catfishย ๐ป๐๐๐๐๐๐๐๐ข๐ ๐๐๐๐ข๐๐ข๐ , wrestling halfbeakย ๐ท๐๐๐๐๐๐๐๐ฆ๐ ๐๐ข๐ ๐๐๐๐, and spotted barbย ๐ต๐๐๐๐๐๐๐ ๐๐๐๐๐ก๐๐ก๐ข๐ , were found in this study, indicating that further attention is needed to preserve their habitat."
Ichthyofauna checklists and rapid assessments are important tools for biologists, researchers, conservationists, and government bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
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Checklist of native freshwater fish from Surabaya River, Indonesia
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Faqih AR, Triastuti RRJ, Wisudyawati D, Anitasari S, Kharisma VD, Rahayu R, Cahyono H, Suliastini J, Islamy RA, Valen FS, Tamam MB, Arisandi P, South J, Kamarudin AS, Wijaya AK, Hasan V. 2026.ย Checklist of native freshwater fish from Surabaya River, Indonesia. Biodiversitas 27 (3):ย d270327.ย https://t.co/XeLnoYk45p
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Surabaya River is a tributary of the Brantas River and is habitat to several freshwater fish species. The aim of this study was to provide information on the species composition of freshwater fish in the Surabaya River, one of the most important rivers in East Java, Indonesia.
All samples used in this study were caught from December 25, 2025, to January 25, 2026. Sampling was conducted at three stations on the Surabaya River: the starting point of the bifurcation at Mlirip Sluice Gate, Mojokerto Regency (Station 1); Krian Sub-District, Sidoarjo Regency (Station 2); and the end of the river at Jagir Sluice Gate, Surabaya City (Station 3). Specimens were identified using specialized papers and books.
This work recorded 35 fish species across 31 genera and 17 families. Cyprinidae was the dominant family, comprising 10 genera and 11 species. Station 1 had the highest species richness (34 species), while Station 3 had the lowest (17 species). Several species endemic of Java, such as Java walking catfishย ๐ถ๐๐๐๐๐๐ ๐๐๐ก๐๐๐โ๐ข๐ , Asian redtail catfishย ๐ป๐๐๐๐๐๐๐๐ข๐ ๐๐๐๐ข๐๐ข๐ , wrestling halfbeakย ๐ท๐๐๐๐๐๐๐๐ฆ๐ ๐๐ข๐ ๐๐๐๐, and spotted barbย ๐ต๐๐๐๐๐๐๐ ๐๐๐๐๐ก๐๐ก๐ข๐ , were found in this study, indicating that further attention is needed to preserve their habitat.
The new information on freshwater fish diversity across different parts of the river will be useful for updating the current database on Javanese freshwater fish species diversity and for providing an updated native species inventory for three segments during the 2025-2026 sampling. Information on the habitat use and ecological interactions of fish occurring in the Surabaya River is urgently needed to make appropriate conservation decisions and plans.
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Freshwater fish collected from Surabaya River, East Java, Indonesia. A ) ๐๐๐ก๐๐๐ก๐๐๐ข๐ ๐๐๐ก๐๐๐ก๐๐๐ข๐ , B ) ๐
๐๐ ๐๐๐๐ ๐๐๐๐ฆ๐๐๐ก๐๐๐๐๐, C ) ๐
๐๐ ๐๐๐๐ ๐๐. ๐๐๐ก๐๐๐๐ ๐ก๐๐๐๐ก๐, D ) ๐ต๐๐๐๐๐๐๐ ๐๐๐๐๐ก๐๐ก๐ข๐ , E ) ๐ต๐๐๐๐๐๐ฆ๐๐ข๐ ๐๐๐๐๐๐๐๐๐๐๐ , F ) ๐ต๐๐๐๐๐๐ฆ๐๐ข๐ ๐๐๐๐๐๐๐๐ก๐ข๐ , G ) ๐ถ๐ฆ๐๐๐๐โ๐๐๐๐๐โ๐กโ๐ฆ๐ ๐๐๐๐๐๐, H ) ๐ฟ๐๐๐๐ ๐โ๐๐ฆ๐ ๐๐โ๐๐๐๐๐๐๐, I ) ๐ฟ๐๐๐๐๐๐๐๐๐ข๐ ๐๐๐๐ก๐๐โ๐๐๐๐ข๐ , J ) ๐๐ฆ๐ ๐ก๐๐๐๐๐๐ข๐๐ข๐ ๐๐๐ก๐ข๐ ๐๐๐๐ ๐ก๐๐๐ , K ) ๐๐ ๐ก๐๐๐โ๐๐๐ข๐ ๐ฃ๐๐ก๐ก๐๐ก๐ข๐ , L ) ๐๐ฆ๐ ๐ก๐๐๐ข๐ ๐๐ข๐๐๐๐๐๐๐๐๐ , M ) ๐๐๐๐๐๐ ๐ ๐๐โ๐๐๐ข๐ ๐ ๐๐๐, N ) ๐ป๐๐๐๐๐๐ ๐๐๐๐๐๐๐๐๐๐๐๐ก๐, O ) ๐ป๐๐๐๐๐๐๐๐ข๐ ๐๐๐๐ข๐๐ข๐ , P ) ๐๐ฆ๐ ๐ก๐ข๐ ๐ ๐๐๐๐๐๐๐๐๐๐, Q ) ๐๐ฆ๐ ๐ก๐ข๐ ๐๐๐๐๐๐๐๐๐ , R ) ๐๐ฆ๐ ๐ก๐ข๐ ๐๐๐๐๐๐ฃ๐๐๐ก๐ข๐ , S ) ๐บ๐๐๐ ๐ ๐๐๐๐๐๐ข๐ ๐๐๐ข๐๐๐ , T ) ๐ถ๐๐๐๐๐๐ ๐๐๐ก๐๐๐โ๐ข๐ , U ) ๐๐๐๐๐๐ ๐๐ข๐ ๐๐๐๐๐๐๐, V ) ๐๐ ๐๐ข๐๐๐๐๐๐ ๐๐๐๐๐๐๐๐๐ข๐ , W ) ๐ฟ๐๐๐๐๐ โ๐๐ฅ๐๐๐๐๐, X ) ๐ด๐๐๐๐๐ ๐ก๐๐ ๐ก๐ข๐๐๐๐๐ข๐ , Y ) ๐๐๐๐โ๐๐๐๐๐ข๐ ๐ก๐๐๐โ๐๐๐ก๐๐๐ข๐ , Z ) ๐๐๐๐โ๐๐๐ ๐๐ ๐ฃ๐๐ก๐ก๐๐ก๐, AA ) ๐๐ ๐โ๐๐๐๐๐๐ข๐ ๐๐๐๐๐๐ฆ, AB ) ๐ถโ๐๐๐๐ ๐ ๐ก๐๐๐๐ก๐, AC ) ๐๐ฅ๐ฆ๐๐๐๐๐ก๐๐๐ ๐๐๐๐๐๐๐๐ก๐, AD ) ๐๐๐ ๐ก๐๐๐๐๐๐๐๐ข๐ ๐ข๐๐๐๐๐๐๐, AE ) ๐๐๐๐๐๐๐๐๐กโ๐ข๐ ๐๐๐ข๐๐๐๐ก๐ข๐ , AF ) ๐๐๐๐๐๐ก๐๐๐ข๐ ๐๐๐ฃ๐๐๐๐๐ ๐๐ , AG ) ๐๐๐ฆ๐ง๐๐๐ ๐๐๐ฃ๐๐๐๐๐ข๐ , AH ) ๐ด๐๐๐๐โ๐๐๐๐ข๐ ๐๐๐๐๐ก๐ข๐ , AI ) ๐ท๐๐๐๐๐๐๐๐ฆ๐ ๐๐ข๐ ๐๐๐๐.
ยฉ 2026 the Author(s). Published in the journal Biodiversitas Journal of Biological Diversity. An open-access article, distributed under the terms of the Attribution-NonCommercial-ShareAlike 4.0 International
(CC BY-NC-SA 4.0) licence. https://t.co/jHt82aoSO6
#SurabayaRiver #Indonesia #Ichthyology #Taxonomy #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #FishTank #AquaticEcosystem #BrantasBasin #Conservation #Ichthyofauna #Java #Cyprinidae #SpeciesInventory
#IchthyofaunaChecklist - Here, researchers report the results of an expedition to the northern section of the Serra do Divisor National Park (PNSD) in the Rio Juruรก basin, Acre State, Brazil, with the aim to increase knowledge of the ichthyofauna of a poorly known region whose protected status is currently under threat.
๐ https://t.co/sx0OLUilU9
The PNSD is situated in the far western portion of Brazil, in the state of Acre, on the watershed divide between the upper Rio Juruรก basin, in Brazil and the middle Rรญo Ucayali basin in Peru. The Rio Juruรก is one of the longest tributaries of the Amazon basin, and most of its headwaters originate in the Serra do Divisor, including the Rio Moa, the main tributary of Rio Juruรก in Acre. Surveys of the ichthyofauna of the PNSD were not conducted during the preparation of the management plan, and the fish diversity of this protected area remains largely unknown.
Ichthyofauna checklists and rapid assessments are important tools for biologists, researchers, conservationists, and government bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
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Ichthyofauna of Serra do Divisor National Park, upper Rio Moa, Rio Juruรก basin, Acre State, Brazil
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Toledo-Piza, M., Giovannetti, V., Mathubara, K., Casas, A. L. da S., Mattox, G. M. T., & Jacรณ, T. R. F. (2026). Ichthyofauna of Serra do Divisor National Park, upper Rio Moa, Rio Juruรก basin, Acre State, Brazil. Biota Neotropica, 26(2), e20251837. https://t.co/lDTkAQwL3o
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The Serra do Divisor National Park (PNSD) is situated in the far western portion of Brazil, in the state of Acre, on the watershed divide between the upper Rio Juruรก basin, in Brazil and the middle Rรญo Ucayali basin in Peru. The Rio Juruรก is one of the longest tributaries of the Amazon basin, and most of its headwaters originate in the Serra do Divisor, including the Rio Moa, the main tributary of Rio Juruรก in Acre. Surveys of the ichthyofauna of the PNSD were not conducted during the preparation of the management plan, and the fish diversity of this protected area remains largely unknown.
Here, we report the results of an expedition to the northern section of the PNSD, aiming to increase knowledge of the ichthyofauna of a poorly known region whose protected status is currently under threat. Seventeen localities in the upper Rio Moa drainage, in the surroundings of the region known as Pรฉ da Serra (between 73ยฐ38โ04.7โ W and 73ยฐ44โ52.7โ W, and 07ยฐ26โ52.2โ S and 07ยฐ32โ 14.7โ S), were sampled using hand nets and beach seines. Sampling was conducted at sites along the Rio Moa, its tributaries, and adjacent lakes.
A total of 3,504 specimens were collected, representing 103 species in 89 genera and 27 families across seven orders. The Characiformes (52 species) and Siluriformes (32 species) were the most diverse orders, followed by the Gymnotiformes (8 species), Cichliformes (8 species), Batrachoidiformes (1 species), Cyprinodontiformes (1 species), and Synbranchiformes (1 species). Species of Characiformes, Siluriformes, and Cichliformes were found in all three sampled environments. Gymnotiformes and Batrachoidiformes were not recorded from lakes, and species of Synbranchiformes and Cyprinodontiformes were found exclusively in tributaries of the Rio Moa. Six species represent new records for Brazilian drainages, 13 for the Rio Juruรก drainage, and 30 for the Rio Moa.
The identification of 43 species requires additional, more detailed studies. For most species, information on the variation of diagnostic characters is provided, which, together with images of selected specimens, is intended to serve as a basis for future studies of the ichthyofauna of the PNSD.
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Top left - Species of Characiformes: Anostomidae (a,b), Acestrorhamphidae (cโr), and Characidae (sโx) from the upper Rio Moa drainage at Serra do Divisor National Park, Acre, Brazil: a) ๐ฟ๐๐๐๐๐๐๐ข๐ ๐๐. ๐๐ฆ๐๐๐๐๐๐๐๐๐๐๐๐ , 100.4 mm SL; b) ๐๐โ๐๐ง๐๐๐๐ ๐๐๐ ๐๐๐๐ก๐ข๐ , 230.9 mm SL; c) ๐ด๐ ๐ก๐ฆ๐๐๐๐๐๐๐ข๐ ๐ ๐., 63.9 mm SL; d) ๐ด๐ ๐ก๐ฆ๐๐๐๐ฅ ๐๐๐๐๐๐ข๐๐๐ก๐ข๐ species group, 63.2 mm SL; e) ๐ต๐๐๐๐ ๐๐๐๐๐๐๐๐๐๐ , 71 mm SL; f) ๐ต๐๐๐๐ ๐ ๐ก๐๐๐๐๐๐โ๐๐๐๐ female, 77.3 mm SL; g) ๐ต๐๐๐๐ ๐ ๐ก๐๐๐๐๐๐โ๐๐๐๐ male, 87.8 mm SL; h) ๐ถ๐ก๐๐๐๐๐๐ฆ๐๐๐ ๐ ๐๐๐๐ข๐๐ข๐ , 37.2 mm SL; i) ๐บ๐ฆ๐๐๐๐๐๐๐ฆ๐๐๐ข๐ ๐กโ๐๐ฆ๐๐๐, 43 mm SL; j) ๐ป๐๐๐๐๐๐๐๐๐ข๐ ๐ ๐., 27.4 mm SL; k) ๐ป๐๐๐๐๐๐๐ ๐ก๐๐ ๐๐๐๐๐๐๐๐๐๐ species group, 26.6 mm SL; l) ๐ฝ๐ข๐๐๐๐๐ ๐๐ ๐ฆ๐๐๐๐ก๐๐๐๐, 41.3 mm SL; m) ๐๐๐๐๐โ๐๐ข๐ ๐๐ ๐๐๐โ๐๐๐ข๐๐, 41.4 mm SL; n) ๐๐๐๐๐โ๐๐ข๐ ๐๐ โ๐๐ ๐๐๐๐๐, 49.8 mm SL; o) ๐๐๐๐๐โ๐๐ข๐ ๐๐ ๐๐๐ก๐๐๐๐๐๐๐, 29.2 mm SL; p) ๐๐๐๐๐โ๐๐ข๐ ๐๐ ๐๐. ๐๐๐ก๐๐๐ข๐๐ ๐๐, 54.2 mm SL; q) ๐๐๐๐๐โ๐๐ข๐ ๐๐ ๐ ๐., 40.4 mm SL; r) ๐
๐๐๐๐๐๐ง๐๐๐๐ ๐๐๐ค๐๐๐๐๐, 45 mm SL; s) ๐ด๐โ๐ฆ๐๐โ๐๐๐๐ฅ ๐ ๐., 35.3 mm SL; t) ๐ฟ๐๐๐ก๐๐๐๐๐๐๐ก๐๐ ๐ ๐ก๐๐๐๐๐๐โ๐๐๐๐, 9.2 mm SL; u) ๐๐๐๐๐๐ ๐โ๐๐๐๐๐๐ฆ๐๐๐ ๐๐๐๐ ๐๐๐๐, 27.4 mm SL; v) ๐๐๐๐๐ก๐๐ ๐ก๐๐๐๐ ๐๐. ๐๐ข๐๐๐ก๐๐ฃ๐, 33.4 mm SL; w) ๐๐๐๐๐๐๐๐๐๐ก๐๐ ๐๐๐๐ข๐๐๐ข๐ , 72.5 mm SL; x) ๐โ๐๐๐๐๐๐๐๐ ๐ก๐๐ ๐๐๐๐๐๐ก๐๐๐๐ , 40.1 mm SL.
Top right - Species of Gymnotiformes: Apteronotidae (aโc), Gymnotidae (d), Rhamphichthyidae (e, f); Sternopygidae (g, h); and Siluriformes: Aspredinidae (iโl), Callichthyidae (mโo), Cetopsidae (p, q), Heptapteridae (rโu), Loricariidae (vโx) from the upper Rio Moa drainage at Serra do Divisor National Park, Acre, Brazil: a) ๐ด๐๐ก๐๐๐๐๐๐ก๐ข๐ ๐๐๐๐๐๐๐๐๐ species group, 188.6 mm SL; b) ๐๐๐๐ก๐ฆ๐ข๐๐๐ ๐ก๐๐๐๐๐๐โ๐ข๐ ๐๐๐๐๐๐ ๐ก๐๐๐ Gรผnther, 226 mm SL; c) ๐๐ก๐๐๐๐๐๐โ๐๐โ๐ฆ๐๐โ๐ข๐ ๐ ๐., 132.9 mm SL; d) ๐บ๐ฆ๐๐๐๐ก๐ข๐ ๐๐๐๐ก๐๐ ๐ species group, 99.6 mm TL; e) ๐บ๐ฆ๐๐๐๐โ๐๐๐โ๐๐โโ๐ก๐ฆ๐ ๐๐๐๐๐๐๐, 142 mm TL; f) ๐ป๐ฆ๐๐๐๐ฆ๐๐ข๐ ๐๐๐๐ก๐ข๐๐ข๐ , 64.2 mm TL; g) ๐ธ๐๐๐๐๐๐๐๐๐๐ ๐ก๐๐๐๐๐๐๐๐ก๐ species group, 112 mm TL; h) ๐๐ก๐๐๐๐๐๐ฆ๐๐ข๐ ๐๐๐๐๐ข๐๐ข๐ , 67.8 mm TL; i, j) ๐ด๐๐๐๐๐๐๐ โ๐ฆ๐๐ ๐๐ข๐๐, 88.8 mm SL, dorsal and lateral views; k, l) ๐๐ก๐๐๐๐๐ข๐๐๐๐๐โ๐๐๐ข๐ ๐๐๐๐๐๐ ๐ ๐ข๐ , 89.2 mm SL, dorsal and lateral views; m, n, o) ๐๐๐๐๐๐๐โ๐๐ ๐กโ๐๐๐๐๐๐ก๐, 132.2 mm SL, lateral, ventral and dorsal views; p) ๐ท๐๐๐ก๐๐๐๐ก๐๐๐ ๐๐ ๐ ๐๐๐ข๐๐ก๐, 27.4 mm SL; q) ๐ป๐๐๐๐๐๐๐๐ ๐๐๐๐๐๐๐๐ก๐ข๐ , 62.2 mm SL; r, s) ๐๐๐๐๐๐๐๐ข๐ ๐๐. ๐๐๐๐๐๐๐๐๐๐, 36.5 mm SL, lateral and dorsal views; t) ๐๐๐๐๐๐๐๐๐๐๐ ๐ ๐. 1, 83.4 mm SL; u) ๐๐๐๐๐๐๐๐๐๐๐ ๐ ๐. 2, 66.6 mm SL; v, w, x) ๐ด๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐., 35.4 mm SL, lateral, dorsal and ventral views.
Bottom left - Species of Siluriformes: Loricariidae (cont.) from the upper Rio Moa drainage at Serra do Divisor National Park, Acre, Brazil: a, b, c) ๐น๐๐๐๐๐ค๐๐๐๐ ๐ ๐๐๐กโ๐, 162 mm SL, lateral, ventral and dorsal views; d, e, f) ๐ป๐๐๐๐๐๐๐๐ก๐๐โ๐กโ๐ฆ๐ ๐๐๐๐๐๐๐ ๐๐๐๐๐ข๐ , 53.1 mm SL, lateral, ventral and dorsal views; g, h, i) ๐ป๐ฆ๐๐๐ ๐ก๐๐๐ข๐ ๐๐๐โ๐๐๐๐๐๐, 82.5 mm SL, lateral, ventral and dorsal views; j) ๐ฟ๐๐๐๐๐ก๐๐โ๐กโ๐ฆ๐ ๐๐๐๐๐๐๐๐ก๐๐ ๐ข๐ , 193.5 mm SL; k, l, m) ๐ฟ๐๐ ๐๐๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐โ๐๐๐๐ข๐๐๐๐๐, 73.9 mm SL; lateral, ventral and dorsal views; n) ๐ฟ๐๐๐๐ก๐ข๐๐๐โ๐กโ๐ฆ๐ ๐๐. ๐๐๐๐ ๐๐ข๐ , 155.3 mm SL; o, p, q) ๐ฟ๐๐๐๐๐๐๐๐ ๐ ๐., 205.3 mm SL, lateral, dorsal and ventral views; r, s, t) ๐๐๐๐๐๐๐๐ข๐ ๐ ๐., 48 mm SL; lateral, dorsal and ventral views; u, v, w) ๐๐ก๐ข๐๐๐ ๐๐๐ ๐ ๐., 214.3 mm SL; lateral, dorsal and ventral views.
Bottom right - Study area and sampling sites in the region of the upper Rio Moa, Serra do Divisor National Park, Acre, Brazil. a ) Rio Moa, Cachoeira do Pedernal (second rapids above ICMBio base at Pรฉ da Serra; site 4); b ) Igarapรฉ Cabo Vitor (site 1); c ) Rio Moa, at confluence with Igarapรฉ Cabo Vitor (site 2); d ) Rio Moa, Cachoeirinha (first rapids above ICMBio base at Pรฉ da Serra); e ) Igarapรฉ Ramรณn (site 6); f ) Rio Moa, left margin, in front of ICMBio base at Pรฉ da Serra (sites 5 and 14); g ) Rio Moa, just downstream of Cachoeirinha (first rapids above ICMBio base at Pรฉ da Serra; site 9); h ) Rio Moa, right margin, rocky beach, below Cachoeirinha (first rapids above ICMBio base at Pรฉ da Serra; site 10).
ยฉ 2026 the Author(s). Published in the journal Biota Neotropica. An open access article, distributed under the terms of the Creative Commons Attribution 4.0 International (CC-BY-4.0) licence. https://t.co/5IYEkz4Rwi
#Ichthyology #Taxonomy #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #FishTank #Ichthyofauna #SerraDoDivisorNationalPark #rioMoa #rioJuruรก #AcreState #Brazil #Acre #SerraDoDivisor #Amazonia #Neotropical #NationalPark #ConservationUnit #Amazon
#IchthyofaunaChecklist - Researchers in this study produced a database of the ichthyofauna for Parque Nacional dos Lenรงรณis Maranhenses and adjacent areas in northeastern Brazil by integrating molecular and morphological data, enabling a revision of the ichthyofauna, including nomenclatural updates and correct identifications. Studies like this are essential for conservation strategies, providing critical baselines for the conservation and management of regional fish fauna.
Accurate species identification is a challenge in megadiverse regions, where morphology alone can lead to overestimation or underestimation of biodiversity. In this context, the incorporation of molecular approaches, such as DNA barcoding, has been useful for accurately estimating regional biodiversity, revealing cryptic diversity, and enabling non-specialists to identify species.
"results show that the diversity of some genera has been underestimated in previous studies (e.g. ๐ธ๐๐๐๐๐๐๐๐๐๐ Jordan & Evermann, 1896, with three instead of one species previously recorded from PNLM and adjacent areas), while other genera had their diversities overestimated (e.g. ๐ต๐๐ฆ๐๐๐๐๐๐ Kner, 1858, with one instead of two species, although two morphotypes are recognized) (other examples can be found in Table 2), and are discussed below."
"Previous studies recorded 60 fish species in PNLM and adjacent areas, and some of these previously recorded species had their identifications revised in the present study...... Consequently, this study expands the known ichthyofaunal diversity of the PNLM and its surrounding areas to a total of 70 species."
Ichthyofauna checklists and rapid assessments are important tools for biologists, researchers, conservationists, and government bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
๐ฅ๐ฒ๐๐ฒ๐ฎ๐ฟ๐ฐ๐ต ๐ง๐ถ๐๐น๐ฒ
Unveiling fish diversity in the Parque Nacional dos Lenรงรณis Maranhenses and adjacent areas through DNA barcoding, Northeastern Brazil
Open-access - https://t.co/qa9cIe2sEr
๐๐ถ๐๐ฎ๐๐ถ๐ผ๐ป
de Oliveira Vieira, L., Kuranaka, M., Garcia-Ayala, J.R. et al. Unveiling fish diversity in the Parque Nacional dos Lenรงรณis Maranhenses and adjacent areas through DNA barcoding, Northeastern Brazil. Biologia 81, 142 (2026). https://t.co/ejQmsMNe3q
๐๐ฏ๐๐๐ฟ๐ฎ๐ฐ๐
Accurate species identification is a challenge in megadiverse regions, where morphology alone can lead to overestimation or underestimation of biodiversity. In this context, the incorporation of molecular approaches, such as DNA barcoding, has been useful in accurately estimating regional biodiversity, revealing cryptic diversity, and enabling identification by non-specialists.
This study generated a molecular database of fishes for Parque Nacional dos Lenรงรณis Maranhenses and adjacent areas, based on sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene. Haplotype analyses were conducted using Maximum likelihood (ML), and the delimitation of Operational Taxonomic Units (OTUs) combined the following methods: Kimura 2-parameter model (K2P), Assemble Species by Automatic Partitioning (ASAP) and Poisson Tree Processes (PTP) methods, using K2Pโโฅโ2% to resolve cases of incongruence between ASAP and PTP. A total of 59 species were recorded, distributed across 51 genera, 29 families, and 13 orders. In total, 258 sequences were analyzed (Two hundred and fifty-three generated in this study and five additional from GenBank), corresponding to the 59 species. K2P genetic distances revealed a clear separation between intraspecific and interspecific variation, with maximum and minimum values of 1.78% and 3.63%, respectively, resulting in a barcoding gap of 1.85% without overlap, demonstrating the high efficiency of the COI marker in species discrimination.
Five new records for the area were identified, including two non-native species. The integration of molecular and morphological data enabled a revision of the ichthyofauna, including nomenclatural updates and the correction of identifications. These findings are essential for conservation strategies.
๐ฃ๐ต๐ผ๐๐ผ ๐๐ฟ๐ฒ๐ฑ๐ถ๐
See study Figures for details.
ยฉ 2026 the Author(s). Published in the journal Biologia. An open access article, distributed under the terms of the Creative Commons Attribution 4.0 International (CC-BY-4.0) licence. https://t.co/5IYEkz4Rwi
#Ichthyofauna #Brazil #Ichthyology #Taxonomy #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #DNABarcoding #ConservationStrategies #Conservation #FreshwaterConservation #Freshwater
#IchthyofaunaChecklist - The tributaries of the Klasafet River System in Sorong, Papua, Indonesia, support diverse freshwater fish communities but remain poorly documented despite increasing anthropogenic pressure. This study assesses the diversity, distribution, and conservation status of freshwater fishes across the tributaries of the Klasafet River System to provide a baseline for conservation planning.
๐ https://t.co/bnSI2TS62V
๐ (preprint) https://t.co/3LwOCjWCZQ
Ichthyofauna checklists and rapid assessments serve as important tools for biologists, researchers, conservationists, and governmental bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves over time due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
๐ฅ๐ฒ๐๐ฒ๐ฎ๐ฟ๐ฐ๐ต ๐ง๐ถ๐๐น๐ฒ
Diversity and conservation status of freshwater fishes in tributaries of the Klasafet River System, Sorong, Papua, Indonesia
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Robi Binur, Ahmad Fadli, Rawati Panjaitan, Diversity and conservation status of freshwater fishes in tributaries of the Klasafet River System, Sorong, Papua, Indonesia, Journal for Nature Conservation, Volume 92, 2026, 127274, DOI: https://t.co/auG56cTQoQ
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The tributaries of the Klasafet River System (KRS) in Sorong, Papua, Indonesia, support diverse freshwater fish communities but remain poorly documented despite increasing anthropogenic pressure. This study assesses the diversity, distribution, and conservation status of freshwater fishes across KRS tributaries to provide a baseline for conservation planning.
Surveys conducted at 22 sites representing rivers, streams, creeks, and ponds recorded 22 species from eight orders and 18 families, comprising 14 native and eight non-native species. Based on their conservation status, 18 species were classified as Least Concern (LC), while ๐๐๐๐๐๐โ๐๐๐ก๐๐๐ข๐ ๐๐๐๐๐กโ๐๐๐๐โ๐๐๐ Collette, 1985, was categorised as Vulnerable (VU), ๐๐๐๐๐๐๐ก๐๐๐๐๐ ๐๐๐๐๐๐๐๐๐๐ (Fowler, 1939) as Near Threatened (NT), ๐๐๐๐๐๐๐๐๐ ๐ก๐๐๐ (Fabricius, 1775) as Data Deficient (DD), and ๐บ๐๐๐ ๐ ๐๐๐๐๐๐ข๐ ๐ ๐. 3 as Not Evaluated (NE). Species richness and diversity were highest in forested streams and minimally disturbed tributaries, whereas introduced fishes dominated oil palm plantation-associated creeks and ponds. Non-native species, particularly ๐ถโ๐๐๐๐ ๐ ๐ก๐๐๐๐ก๐ (Bloch, 1793) and ๐๐ข๐๐ก๐๐ข๐ ๐๐๐๐ฃ๐๐ (Bleeker, 1849), were widespread and abundant, indicating increasing pressure on native assemblages. In contrast, endemic and habitat-specialist species were primarily restricted to clear, well-oxygenated waters with intact riparian vegetation.
These findings highlight the conservation importance of the KRS tributaries and emphasise the need for riparian protection, maintenance of hydrological connectivity, and effective management of non-native species to safeguard freshwater fish biodiversity in this region.
๐ฃ๐ต๐ผ๐๐ผ ๐๐ฟ๐ฒ๐ฑ๐ถ๐
Image not from research - Sorong Rainbowfish (๐๐๐๐๐๐๐ก๐๐๐๐๐ ๐๐๐๐๐๐๐๐๐๐). ยฉ Hakim. https://t.co/mOIARryxz6
https://t.co/YHvAd0x7ne
ยฉ 2026 the Author(s). Published in the Journal for Nature Conservation.
#Ichthyofauna #Zenarchopterus #Ichthyology #Pseudomugil #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #Melanotaenia #Moolgarda #Ichthyofauna #Papua #Indonesia #Conservation #Freshwater #Glossogobius #Sorong
#IchthyofaunaChecklist - Baseline fish inventory of the Trombetas River rapids, a drainage of the southeastern part of the Guiana Shield, Brazil.
๐ https://t.co/AoGvRSjFGn
The Trombetas River basin, a clearwater tributary of the left bank of the Amazon River, originates in the southern portion of the Guiana Shield and flows into the state of Parรก, Brazil. Here, researchers conducted a rapid assessment of the rich ichthyofauna from the rapids of the Trombetas River basin, revealing 53 species, 43 genera, 14 families, and seven orders. Data collected included range expansions for three fish genera, with two of them, ๐ป๐ฆ๐๐๐๐๐๐ ๐ก๐๐ข๐ and ๐๐๐๐๐๐๐๐โ๐๐, being represented by putative new species restricted to rapid habitats.
"The rapids remain preserved mainly due to their location within protected areas, such as the Trombetas State Forest and traditional community territories. However, the proposed Cachoeira Porteira Hydroelectric Dam poses a significant threat to these habitats and their associated fauna, as this stretch of the Trombetas River encompasses one of the last remaining natural rapid systems in the Amazon Basin." #FreeflowingRivers
Ichthyofauna checklists and rapid assessments serve as important tools for biologists, researchers, conservationists, and governmental bodies/NGOs. They provide critical baselines for the conservation and management of regional fish fauna. Our understanding of species composition in a territory evolves over time due to species movements across borders, extinctions, introductions, and new taxonomic evidence.
๐ฅ๐ฒ๐๐ฒ๐ฎ๐ฟ๐ฐ๐ต ๐ง๐ถ๐๐น๐ฒ
Baseline fish inventory of the Trombetas River rapids, a drainage of Southeastern of the Guiana Shield, Brazil
๐๐ถ๐๐ฎ๐๐ถ๐ผ๐ป
Araรบjo, F. A. de A., Dopazo, M., Ferreira, M. F. C., Luz, Z., Silva, A. N. da, Braga, M. L. P., Malcher, J. L. de C., Damasceno, A. B. da S., Mendonรงa, M. B., Gimรชnes Jรบnior, H., Wosiacki, W. B., & Akama, A. (2026). Baseline fish inventory of the Trombetas River rapids, a drainage of Southeastern of the Guiana Shield, Brazil. Papรฉis Avulsos De Zoologia, 66, e202666022. https://t.co/bAksVany3a
๐๐ฏ๐๐๐ฟ๐ฎ๐ฐ๐
The Trombetas River basin, a clearwater tributary of the left bank of the Amazon River, originates in the southern portion of the Guiana Shield and flows into the state of Parรก, Brazil. Upstream of Cachoeira Porteira, the river flows through a rocky channel with steep gradients and sandy-rocky substrates, forming numerous rapids and waterfalls. Despite the recognized biological importance of Guiana Shield rivers, comprehensive fish surveys remain scarce.
Here, we conducted a rapid assessment of the fish community inhabiting rapids, primarily using diving-based collection methods, to document species diversity and community structure in a poorly explored environment. We collected 302 specimens, representing 53 species, 43 genera, 14 families, and seven orders. Siluriformes was the most species-rich order, followed by Characiformes, Cichliformes and Gymnotiformes. At family level, Loricariidae showed the highest species richness, followed by Cichlidae, Anostomidae and Apteronotidae. We also report the first occurrence of ๐ด๐ ๐ก๐๐๐๐โ๐ฆ๐ ๐ข๐ ๐๐๐ก๐๐๐โ๐ข๐ (Siluriformes, Auchenipteridae) in the Trombetas River and range extensions of the strictly rheophilic genera ๐ป๐ฆ๐๐๐๐๐๐ ๐ก๐๐ข๐ (Siluriformes, Loricariidae) and ๐๐๐๐๐๐๐๐โ๐๐ (Cichliformes, Cichlidae).
The rapids remain preserved mainly due to their location within protected areas, such as the Trombetas State Forest and traditional community territories. However, the proposed Cachoeira Porteira Hydroelectric Dam poses a significant threat to these habitats and their associated fauna, as this stretch of the Trombetas River encompasses one of the last remaining natural rapid systems in the Amazon Basin.
๐ฃ๐ต๐ผ๐๐ผ ๐๐ฟ๐ฒ๐ฑ๐ถ๐
Examples of species from the Rio Trombetas rapids. (1) ๐ป๐ฆ๐๐๐๐๐ ๐ก๐๐๐ข๐ ๐๐๐๐๐๐๐๐๐ ; (2) ๐๐ฆ๐๐๐๐ก๐๐๐๐๐๐ข๐ ๐๐๐ก๐๐๐๐ ๐๐๐๐ก๐ข๐ ; (3) ๐๐๐๐๐ก๐๐ ๐๐๐๐ข๐๐๐๐ (juvenile); (4) ๐ฟ๐๐๐๐๐๐๐ข๐ ๐๐๐๐๐๐๐๐๐; (5) ๐ถ๐๐๐๐๐๐๐โ๐๐ ๐ ๐.; (6) ๐ด๐๐ก๐๐๐๐๐๐ก๐ข๐ ๐ ๐.; (7) ๐๐โ๐๐๐๐๐๐๐๐ ๐๐ ๐๐๐๐ข๐ ; (8) ๐
โ๐๐๐๐๐๐๐โ๐๐๐ ๐ ๐.; (9) ๐ผ๐๐๐๐๐๐๐๐๐ ๐ ๐.; (10) ๐๐ ๐๐ข๐๐๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐. 1; (11) ๐๐ ๐๐ข๐๐๐๐๐๐๐๐๐๐๐ ๐ ๐.; (12) ๐
โ๐๐๐๐๐๐๐๐ ๐๐๐๐๐๐ข๐ ๐ก๐๐๐; (13) ๐
โ๐๐๐๐ก๐๐๐๐๐๐๐ข๐ โ๐๐๐๐๐กโ๐; (14) ๐๐ ๐ ๐๐๐๐๐๐ ๐ ๐.; (15) ๐ด๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐. 1; (16) ๐ป๐๐๐ก๐ก๐๐ ๐ก๐๐๐๐๐๐ก๐๐๐ ๐๐ ; (17) ๐๐ ๐๐ข๐๐๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐. 2; (18) ๐ต๐๐๐ฆ๐๐๐๐๐ ๐ก๐๐ข๐ ๐๐ข๐๐๐๐๐๐๐๐; (19) ๐๐๐๐๐๐๐ก๐๐ ๐๐. ๐ฃ๐๐ก๐ก๐๐ก๐; (20) ๐๐ ๐๐ข๐๐๐๐๐๐ ๐ก๐๐ข๐ ๐ ๐. 3. All photographs by Heriberto Gimรชnes Jr.
Copyright ยฉ 2026 the Author(s). Published in the journal, Papรฉis Avulsos De Zoologia. This paper is released under a Creative Commons Attribution 4.0 International (CC-BY-4.0) licence.
#Ichthyofauna #FishInventory #Ichthyology #Trombetas #Biodiversity #AquariumHobby #Fishkeeping #Aquarist #TropicalFish #Brazil #AmazonBasin #Neotropical #NeotropicalFishes #Rapids #TrombetasStateForest #TrombetasRiver #GuianaShield #CachoeiraPorteira #Characiformes #Cichliformes #Gymnotiformes #Loricariidae #Auchenipteridae #Anostomidae #Apteronotidae #Conservation #FreshwaterConservation #Rheophilic
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๐ https://t.co/seNk9ELD46
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๐ https://t.co/ajyWiDPjXZ
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๐ https://t.co/AjPivg56Do
#IchthyofaunaChecklist - โLoreto - Fish from the tributaries of Quebrada Anazo (Achuar language)โ, a lovely field guide highlighting the amazing ichthyofauna biodiversity of the region, home to many recognisable aquarium species. #FieldGuide #Peru
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#IchthyofaunaChecklist The Western Ghats, traverses Goa State, India. Researchers for two years sampled Goaโs freshwater riverine ecosystems, revealing a total of 84 species belonging to 59 genera, 26 families and 12 orders.
๐ https://t.co/SgM0Ys9AjR
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๐ (direct PDF) - https://t.co/tPFOBJG9qA
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