Endangered, exploited glass eels (Anguilla anguilla) with critical levels of heavy metals and microplastics reveal both shipping and plastic spill threats

Environmental Pollution, Год журнала: 2025, Номер unknown, С. 125824 - 125824

Опубликована: Фев. 1, 2025

Язык: Английский

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Conservation of teleost fishes: Application of reproductive technologies

Theriogenology Wild, Год журнала: 2024, Номер 4, С. 100078 - 100078

Опубликована: Янв. 1, 2024

Fishes are by far the most species-rich group of vertebrates, with 36,105 species currently recognised, approximately same number as that all non-fish vertebrates combined. Recent decades have witnessed dramatic population declines for many fish species, together a loss in overall biodiversity. Globally, biodiversity is being threatened multitude anthropogenic impacts including overfishing, habitat loss, pollution, aquaculture, river connectivity, climate change and impact alien species. Nowhere world's crisis more acute than freshwater ecosystems. While rivers, lakes wetlands cover less 1% planet's total surface, they home to over half world´s One third fishes now extinction, 80 already extinct. This review covers main drivers declining biodiversity, details remedial strategies aimed at conserving both marine The preservation genetic resources through cryobanking reproductive cells tissues, collectively known germplasm, will be valuable tool conservation With help range emerging technologies, frozen germplasm play key role future situ ex initiatives. ability establish cryo-banks full sperm, oocytes, embryos germ represents powerful use rapid advance next-generation sequencing proliferation such fully sequenced genomes expected result expansion application genomics management populations, instrumental formulating mitigations directed

Язык: Английский

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High spatial variability in a species‐rich assemblage of diadromous fishes in Hong Kong, southern China

Journal of Fish Biology, Год журнала: 2024, Номер 105(3), С. 663 - 681

Опубликована: Июнь 3, 2024

China has experienced substantial coastal reclamation and damming of rivers. These changes have the potential to impact migrations diadromous fishes between sea fresh waters, but composition these impacts barriers their movement in received little attention. We inventoried species distribution fishes, on them, Hong Kong Special Administrative Region (HKSAR), southern China. Fish assemblages were surveyed using hand-nets, supplemented by cast-netting single-pass snorkel surveys, 24 small streams across three regions. Surveys undertaken multiple occasions during wet dry seasons account for monsoonal tropical climate. Twenty-eight collected, mostly gobies, amounting over half (53%) total richness primary freshwater fishes; four additional are known from literature records. Diadromous was 48% greater season, when all encountered. Richness varied substantially among streams, a maximum 17 (2 that diversity hot spots) none (3 streams). The most widespread fish Glossogobius giuris (71% frequency occurrence), followed Mugil cephalus (58% occurrence) Eleotris oxycephala (50% occurrence). remaining 25 occurred fewer than streams; 12 confined single stream may be locally threatened. There conspicuous spatial differences HKSAR, despite its limited extent (1114 km

Язык: Английский

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Fish Assemblages in the Penobscot River: A Decade after Dam Removal

Marine and Coastal Fisheries, Год журнала: 2023, Номер 15(1)

Опубликована: Фев. 1, 2023

Abstract The Penobscot River Restoration Project in Maine was a large river rehabilitation project that culminated the removal of two lowermost dams and improvements to fish passage on several remaining dams. Fish assemblages were surveyed for 3 years prior rehabilitation, after 8 rehabilitation. Approximately 475 km shoreline sampled via boat electrofishing, yielding 133,394 individual 41 species. greatest shifts assemblage structure occurred immediately dam formerly impounded sections, with an increased prevalence riverine migratory Long‐term sampling documented changes within tributaries tidally influenced segments, where schools adult young‐of‐the‐year alosines abundance. Upstream dam, remains dominated by lacustrine species, while anadromous fishes continue be most abundant downstream dam. Our results provide evidence removals result altered assemblages, which are now species previously habitats. Alosines have exhibited long‐term response restoration efforts.

Язык: Английский

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Evaluating the cascade dam construction effects on endemic fish habitat and population status in spawning sites of Lancang River (in Tibet), China

Ecological Modelling, Год журнала: 2023, Номер 483, С. 110450 - 110450

Опубликована: Июль 8, 2023

Язык: Английский

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Patterns, drivers, and a predictive model of dam removal cost in the United States

Frontiers in Ecology and Evolution, Год журнала: 2023, Номер 11

Опубликована: Июль 24, 2023

Given the burgeoning dam removal movement and large number of dams approaching obsolescence in United States, cost estimating data tools are needed for prioritization, planning, execution. We used list removed compiled by American Rivers to search publicly available reported costs projects. Total information could include component related project deconstruction, monitoring, several categories mitigation activities. from 455 unique sources 668 States 1965 2020. The removals occurred within 571 projects involving 1–18 dams. When adjusted inflation into 2020 USD, these totaled $1.522 billion, with per-dam ranging $1 thousand (k) $268.8 million (M). median was $157k, $823k, $6.2M that were< 5 m, between 5–10 > 10 m height, respectively. Geographic differences total showed northern states general, Pacific Northwest particular, spent most on removal. Midwest Northeast proportionally more less than whereas Southwest larger tall. stochastic gradient boosting quantile regression model against potential predictor variables including characteristics (dam height material), hydrography (average annual discharge drainage area), complexity (inferred construction sediment management, mitigation, post-removal drivers), geographic region. Dam average at site, were predominant drivers cost. final had an R 2 57% when applied a test dataset predictions root mean squared error $5.09M absolute $1.45M, indicating its utility predict estimated developed shiny application using customized inputs exploratory analyses planning.

Язык: Английский

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Assessment of the impact of chemical pollution on endangered migratory fish in two major rivers of France, including spawning grounds

The Science of The Total Environment, Год журнала: 2024, Номер 931, С. 172748 - 172748

Опубликована: Апрель 26, 2024

Язык: Английский

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Strongholds for Pacific salmon: A proactive conservation strategy for ecosystem health, food security, biodiversity, and climate resilience

Fisheries, Год журнала: 2025, Номер unknown

Опубликована: Март 21, 2025

ABSTRACT Nested within the linked global crises of biodiversity loss and climate change are threats to cultural ecological keystones such as Pacific salmon Oncorhynchus spp., a group species with widespread ecological, cultural, economic value. Wild can rally public support for ecosystem protection link place-based conservation efforts benefits. Realizing these benefits depends on leveraging broad advance forward-looking approaches that safeguard food security, biodiversity, resilience. Here we provide insights from multidecadal implementation proactive wild strategy at scale North Rim. This approach is necessary complement policies focused preventing extinction after populations habitats degraded it provides globally significant contributions targets including recent 30 × goals Convention Biological Diversity.

Язык: Английский

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Understanding the impact of barriers to onward migration; a novel approach using translocated fish

Journal of Environmental Management, Год журнала: 2023, Номер 335, С. 117488 - 117488

Опубликована: Фев. 22, 2023

River catchments worldwide are heavily fragmented by anthropogenic barriers, reducing their longitudinal connectivity and contributing to the decline of migratory fish populations. Direct impacts individual barriers on well-established, but barrier onward migration poorly understood, despite relevance evidence-based, catchment-scale, management threatened species. This study investigated upstream spawning 352 acoustic tagged river lamprey (Lampetra fluviatilis), translocated two key (R2: n = 60 & 59; R3: 59 52) compared a control group (R1: 61 59), across contrasting (dry wet, 180 172) years in Yorkshire Ouse, England, reveal impact migrating fish. Release further increased degree catchment penetration, with median distance R1 56.1% 68.6% greater for released at R2 R3 respectively. Median delays downstream-most main were 23.8 5.4 days (2018/19) 9.3 11.4 (2019/20). However, delay only observed time reach habitat, final assumed location speed movement one upper tributary during 2019/20 whilst they habitat 2018/19 other. Ultimately, limited post-passage penetration was consecutive release upstream. demonstrated importance true understanding inform catchment-wide planning, evidence vital worldwide. Although findings this do support use trap transport as measure remediate migration, passage engineering improvements or removal, structures shown be most inhibiting should considered best sustainable option improve passage.

Язык: Английский

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Identifying potential trace metal contamination impacts of a coal ash landfill on the largest Chesapeake Bay tributary (Chester, VA, USA)

Environmental Toxicology and Chemistry, Год журнала: 2025, Номер 44(3), С. 802 - 811

Опубликована: Янв. 6, 2025

Abstract Coal fly ash is a highly heterogeneous waste product that becomes concentrated with metals after combustion have been shown to act as neurotoxins and/or carcinogens in both wildlife and humans. As such, increased understanding of the presence, concentrations, potential ecosystem impacts needed. The Chesterfield power station contains more than 15 million tons located adjacent James River, which serves tributary Chesapeake Bay. Our study investigated (1) presence concentrations aluminum (Al), aresnic (As), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), magnesium (Mg), manganese (Mn), lead (Pb), selenium (Se), zinc (Zn) surface water, deep sediment samples obtained from surrounding area (2) various teleost species, using environmental DNA (eDNA) sampling. Universal cokriging was used estimate spatial variability sediments extent pollution interpreted enrichment factors (EF). Little contamination observed water compared samples. Elevated Al, As, Cd, Cr, Fe, Pb, Zn were areas immediately coal landfills. Arsenic, Pb showed EF sites landfills, suggesting due anthropogenic factors. Environmental analyses revealed 22 several identified threatened, endangered, diadromous, consumed by anglers who use River. Collectively, our results provide novel insight regarding on an important Bay watershed guidance for future risk assessment.

Язык: Английский

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