What does this research mean for the field?

Exposure to environmental degradation in the lower Doce River basin is associated with significant reproductive and neural alterations across multiple native and non-native fish species, indicating ecosystem-level biological impairment. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate gonadal maturation stages, reproductive histopathology, and larval neural and craniofacial deformities across native and non-native fish assemblages in a river basin affected by a mining dam collapse.

September 2, 2026Anatomia Histologia EmbryologiaOpen Access

Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non‐Native Fishes From the Lower Doce River Basin in Southeastern Brazil

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To evaluate gonadal maturation stages, reproductive histopathology, and larval neural and craniofacial deformities across native and non-native fish assemblages in a river basin affected by a mining dam collapse.
Sampled native and non-native fish across lakes, tributaries, reservoirs, and the main river channel across rainy and dry seasons using gill nets and cast nets.
Performed morphological and histopathological analyses on gonads and larval brain regions, specifically the telencephalon and optic tectum.
Quantified cellular organization through histometric analysis measuring nuclear intersection counts and inter-nuclear distances in normal versus malformed neural tissues.
Histological assessment identified reproductive abnormalities across multiple species, including oocyte atresia, yolk liquefaction, and interstitial proteinaceous fluid accumulation, with non-native species displaying higher spawned maturation frequencies in the main channel and tributaries.
Pygocentrus nattereri and Prochilodus costatus larvae displayed craniofacial deformities linked to neural tissue eversion and structural displacement in the telencephalon and optic tectum.
Histometric analysis demonstrated significantly higher nuclear intersection counts and reduced inter-nuclear distances in normal neural tissues compared with malformed tissues (p < 0.05).

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Implication

Biomonitoring study reveals reproductive damage and neural deformities in native and non-native fishes, indicating widespread ecosystem-level biological impairment after a mining disaster.

Cite This Study

Marcon et al. (2026) studied this question.

synapsesocial.com/papers/6a97e305c562ede874ec78b8 https://doi.org/10.1111/ahe.70168

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Implication

Biomonitoring study reveals reproductive damage and neural deformities in native and non-native fishes, indicating widespread ecosystem-level biological impairment after a mining disaster.

Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non‐Native Fishes From the Lower Doce River Basin in Southeastern Brazil

Key Points

Discussion

Implication

Cite This Study

Morphological and Histometric Alterations in Gonadal and Neural Tissues of Native and Non‐Native Fishes From the Lower Doce River Basin in Southeastern Brazil

Key Points

Discussion

Implication

Cite This Study

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