Aquatic Robotics: Unmanned Vehicles in Fisheries and Habitat Monitoring

Published: Jan. 1, 2025

Language: Английский

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Aquatic ecosystem services: an overview of the Special Issue

Hydrobiologia, Journal Year: 2023, Volume and Issue: 850(12-13), P. 2473 - 2483

Published: May 17, 2023

Language: Английский

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Sturgeon Parasites: A Review of Their Diversity and Distribution

Diversity, Journal Year: 2024, Volume and Issue: 16(3), P. 163 - 163

Published: March 5, 2024

Sturgeon species have inhabited the world’s seas and rivers for more than 200 million years hold significant taxonomic significance, representing a strong conservation interest in aquatic biodiversity as well economic sector, their meat eggs (caviar) are highly valuable goods. Currently, sturgeon products byproducts can be legally obtained from aquaculture sustainable source. Intensive farming practices accompanied by parasitic infestations, while several groups of parasites impact on both wild farmed sturgeons. The present article is review common genus: Protozoa, Trematoda, Crustacea, Nematodes, Monogenea, Hirudinea, Copepoda, Acanthocephala, Cestoda, Polypodiozoa, Hyperoartia, also addressing pathology statistical distribution.

Language: Английский

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Assessing Trends and Challenges: Insights From 30 Years of Monitoring and Management of Threatened Southern Atlantic Salmon Populations

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(1)

Published: Jan. 1, 2025

ABSTRACT The Atlantic salmon ( Salmo salar ) has suffered significant population declines worldwide, prompting urgent conservation efforts, especially in its southern distribution area. This study is aimed at characterising the dynamics of Bidasoa River (Spain), by focusing on fluctuations and long‐term trends returns, characteristics effects angling stocking activities. For this, monitoring data spanning three decades (1993–2023) from a station anglers' captures were used together with activities provided Fish Management Section Navarre Government. Results reveal cyclical patterns driven distinctive wavelengths linked to life cycle, climatic variations local habitat connectivity improvements. was primarily dominated one‐sea‐winter males returning during autumn–winter season. Over period, reduction body size observed, likely reflecting challenging marine conditions. Angling pressure notably skewed towards multi‐sea‐winter females, which could influence natural recruitment dynamics. Despite low mean return rate stocked (0.13%), they contributed one‐third annual underscoring their potential role supporting persistence albeit expense reducing spawning, amid broader ecological challenges. provides valuable insights into complex interplay anthropogenic factors affecting populations European rivers. These are crucial for developing implementing effective strategies preserving salmon, species cultural importance.

Language: Английский

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Lessons learned from applying eDNA surveying to diadromous fish detection across the north-east Atlantic region

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Abstract Regular monitoring of diadromous fishes is critical to inform their management and conservation. Yet, the in-situ data collection these species challenging due complex life cycle low abundance. Focusing on sea lamprey ( Petromyzon marinus , Petromyzontidae) European shads Alosa alosa A. fallax Clupeidae), emblematic in Northeast Atlantic region, this study leverages use water environmental DNA (eDNA) samples monitor distribution range. For that aim, we developed quantitative PCR (qPCR) digital (dPCR) assays applied them detect shad a network 44 river basins across Spain, France, Ireland, UK. We found qPCR efficiently detected presence/absence shads, while higher sensitivity dPCR was essential for detecting lower abundant partly sessile behaving amount collected. Moreover, showed significantly eDNA copies per litre compared probably larvae spending several years burrowed within soft sediments, reducing shedding into column. The integration historical datasets with snapshot wide-ranging enhances our understanding rivers. Importantly, lessons learned international collaboration are towards prevailing framework conservation migratory fishes, highlighting need well-designed sampling strategies coupled species-specific bust long-term efforts species.

Language: Английский

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Mesohabitat Spawning Preference of the Anadromous Twaite Shad (Alosa fallax, Lacépède 1803) in the Tagliamento River (Italy)

Ecohydrology, Journal Year: 2025, Volume and Issue: 18(1)

Published: Jan. 1, 2025

ABSTRACT Alosa fallax (Lacépède, 1803) is an anadromous fish which utilizes European rivers for spawning. As many species, Twaite shad populations are declining due to river damming and hydromorphological alterations, impact their spawning sites. In this study, we developed mesohabitat suitability criteria the period of A. by analysing geomorphic units (GUs), with local habitat attribute, in prefers spawn. The study was conducted Tagliamento River (NE Italy). Habitat depiction performed following MesoHABitat SImulation Model (MesoHABSIM) approach. High‐resolution spatial information from Uncrewed Aerial Systems (UAS), a two‐dimensional (2D) hydrodynamic model field data collected during were utilized attribute evaluation. association between sites GUs characteristics explored training classification random forest (RF) model. final parsimonious RF demonstrated high accuracy (98.8%) true skill statistic (97.6%), indicating that glides riffles shallow depths (0.15–0.45 m), moderate current velocities (0.30–0.75 m/s) small‐sized sediment (diameter 0.2–6 cm) Using infrared camera, 72 surface mating events distinctly recorded 11.30 PM 02.15 AM over two nights, demonstrating technique's observing activity. video analysis revealed monitored population exhibited similar behaviour other shads (e.g., alosa ). This provides useful insights develop novel management approaches preserving or restoring , supporting its conservation.

Language: Английский

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Upriver migrating sea lamprey exhibit similar responses to hydrodynamic features as other up and downriver-moving species

Frontiers in Freshwater Science, Journal Year: 2025, Volume and Issue: 3

Published: April 14, 2025

Identifying commonalities in how fish navigate rivers near infrastructure will enhance water operations and design by improving our ability to predict engineering outcomes (e.g., barrier construction/removal, passage installation) novel settings before the cost of real-world implementation. Evidence from intermediate-scale computer models (time scales minutes days spatial <2 km) suggests that movement behavior is frequently governed responses one or more following hydrodynamic features: (1) flow direction (i.e., rheotaxis), (2) velocity magnitude, (3) turbulence, (4) depth, plus (5) integration information over recent time periods memory/experience). However, lack consistent modeling approaches, infrequent assessment each response isolation combination, a focus on limited number species means generality these uncertain. We use model, specifically pattern-oriented approach incorporating individual based (IBMs), apply four features memory/experience different combinations study their value for reproducing an infrequently modeled lifestage, upriver migrating adult sea lamprey, Petromyzon marinus . The site was region downstream Sault Ste. Marie lock dam complex located between Canada U.S.A St. Marys River joining Lake Superior Huron. Our analysis indicates rheotaxis magnitude as well past experience improve lamprey spatio-temporal prediction compared other, simpler forms behavior. Sea also biased toward lower levels turbulence turbulent kinetic energy) its precursor gradient speed). A depth not found be important, but domain two-dimensional which assessment. As similar are very fish, appear underlie river navigation across range life stages share goal-oriented downriver movement. systematic highlights accuracy trade-offs response, individually often accompany alternative behavioral formulations model structure provides framework future findings analyses additional contexts can added.

Language: Английский

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Glass eels at the continental edge of Europe: revisiting catchment recruitment at the international River Minho/Miño

Hydrobiologia, Journal Year: 2024, Volume and Issue: 851(11), P. 2591 - 2607

Published: Jan. 29, 2024

Abstract The glass eel catch from the international River Minho, western Iberian Peninsula, forms southernmost Atlantic series in composite index outside North Sea assessing European recruitment. Here, new experimental yield data lower estuary (1981–2022) and fishers´ daily records (1990–2022) were modelled to describe compare seasonal interannual trends. Seasonality matched river discharge climatology, possibly a more general feature southern range of species distribution, with difference between high low season becoming less marked recent periods abundance. Glass showed sharp decline during 1980s, line recruitment total Minho catch, but not local estimates per unit effort. This is corroborated by trends records, suggesting that reduction effort was consequence gradual adjustment catchment mediated progressively tighter management measures. inefficiency fisheries regulatory measures guarantee stock recovery alone calls for comprehensive reverse anthropogenic impacts on continental populations, task seems Herculean.

Language: Английский

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Serviços ecossistémicos

Revista de Ciência Elementar, Journal Year: 2024, Volume and Issue: 12(1)

Published: March 30, 2024

Serviços ecossistémicos são os bens e recursos que as pessoas obtêm dos ecossistemas lhes trazem um benefício (por exemplo, contribuem para a sua sobrevivência, realização de atividades, bem-estar). Os serviços podem ser diretos se usados diretamente pelas (como água, alimento, fibras, espaço atividades lazer) ou indiretos manutenção do ecossistema o fornecimento (e incluem, por ciclos da água nutrientes, biodiversidade). tipo consumptivo fibras) não-consumptivo dependendo utilização reduz quantidade disponível. também classificados acordo com proporcionam às pessoas; aprovisionamento incluem produtos consomem como fibras energia, enquanto culturais benefícios imateriais valores estéticos, espirituais lazer. múltiplos fornecidos pelos rios não tomados garantidos em face das múltiplas ameaças estes estão sujeitos. Uma abordagem promover proteção restauro outros ecossistemas) é identificação fornecem valoração económica. O pagamento pode contribuir incentivar conservação uso sustentável ecossistemas. A saúde fundamental garantir contínuo ecossistémicos.

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