Organic UV absorbents in the deepwater redfish (Sebastes mentella) from the St. Lawrence Estuary and Gulf: Distribution and human health risk assessment

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 906, P. 167515 - 167515

Published: Sept. 30, 2023

UV absorbents (UVAs), such as organic filters (UVFs) and benzotriazole stabilizers (BZT-UVs), are used in a wide range of consumer industrial products they contaminants emerging concern the environment. However, their occurrence fate deep-sea environments inadequately understood. This study investigated distribution five UVFs ten BZT-UVs muscle (n = 127) 2019-collected deepwater redfish (Sebastes mentella) from St. Lawrence Estuary Gulf (SLEG) (Canada) to better understand accumulation these fish. Small (<30 cm) tended have higher concentrations UVAs than that larger specimens (>30 cm). The UVF 2-hydroxy-4-methoxybenzophenone (BP3) was most frequently detected (present 34 % all samples) target UVA, with high 413 ng/g (dry weight). According δ15N δ13C data, pelagic-eating redfish, individuals lower trophic levels had lipid content accumulated more BP3 muscles. Four were muscle, but detection frequency 30 %. estimated hazard quotient for <2.3 × 10-2 general Canadian populations, indicating unlikely pose health risks humans through consumption. Factors influencing bioaccumulation well effects may on species, should be researched further.

Language: Английский

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Trophic ecology of marine fish

Elsevier eBooks, Journal Year: 2025, Volume and Issue: unknown, P. 119 - 142

Published: Jan. 1, 2025

Language: Английский

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DNA Metabarcoding Improves the Taxonomic Resolution of Visually Determined Diet Composition of Beaked Redfish (Sebastes sp.)

Environmental DNA, Journal Year: 2025, Volume and Issue: 7(1)

Published: Jan. 1, 2025

ABSTRACT Beaked redfishes ( Sebastes fasciatus and mentella ) of the northwest Atlantic have recently reached record abundance levels in estuary northern Gulf St. Lawrence, dominated by . Knowledge their diet composition is essential to understand trophic role that these groundfish play ecosystem. The objective present study was compare performance visual examination DNA metabarcoding stomach contents same individual redfish caught Lawrence. Using a universal metazoan mitochondrial cytochrome c oxidase subunit I (COI) marker, we identified total 24 taxonomic groups, composed 22 species two genera content 185 stomachs with metabarcoding. We compared results 25 prey types, eight at genus nine level, obtained analysis (SCA). While both techniques revealed similar composition, our showed SCA perform differently for particular categories, terms detectability resolution, as well estimated relative importance weight occurrence diet. use along validates improves resolution visually determined prey, which supports concept provide useful complementary information on likely other fish species.

Language: Английский

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Fish use of deep-sea sponge habitats evidenced by long-term high-resolution monitoring

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

It is critical that fish's habitat uses of benthic habitats are understood, to inform effective fisheries management and predict the impacts human activities climate change. In this study, landers were used collect long-term high-temporal resolution data gain insights into use sponge grounds by fish at Sambro Bank Conservation Area. An integrated ecosystem-based monitoring approach was used, involving collected on biology, food supply, oceanography. Fish abundance, behaviour complex benthopelagic interactions analysed over spatial extended temporal scales (i.e., 30-minute intervals from 2021–2023). A total 21 different planktivorous benthivorous taxa found utilise seafloor. We show can act as a nursery, feeding shelter for commercially important fish. In-depth analyses Redfish, urophycid hakes, Silver Hake revealed distinct diel seasonal patterns showed how food, density current speed drivers their abundance behaviour. Supported fishery trawl survey reports, ecosystem importance environmental Such information crucial developing implementing robust, evidence-based policy management.

Language: Английский

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Fish use of deep-sea sponge habitats evidenced by long-term high-resolution monitoring

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: May 21, 2025

Abstract It is critical that fish’s habitat uses of benthic habitats are understood, to inform effective fisheries management and predict the impacts human activities climate change. In this study, landers were used collect long-term high-temporal resolution data gain insights into use sponge grounds by fish at Sambro Bank Conservation Area. An integrated ecosystem-based monitoring approach was used, involving collected on biology, food supply, oceanography. Fish abundance, behaviour complex benthopelagic interactions analysed over spatial extended temporal scales (i.e., 30-min intervals from 2021 2023). A total 21 different planktivorous benthivorous taxa found utilise seafloor. We show can act as a nursery, feeding shelter for commercially important fish. In-depth analyses Redfish, urophycid hakes, Silver Hake revealed distinct diel seasonal patterns showed how food, density current speed drivers their abundance behaviour. Supported fishery trawl survey reports, ecosystem importance environmental Such information crucial developing implementing robust, evidence-based policy management.

Language: Английский

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Ontogenetic shifts in isotope-inferred trophic ecology of Atlantic Bluefin Tuna (Thunnus thynnus) in Atlantic Canada

Marine Ecology Progress Series, Journal Year: 2024, Volume and Issue: 744, P. 147 - 160

Published: Aug. 2, 2024

Upper trophic level predators can greatly influence the dynamics and productivity of forage fish species. Quantifying this requires information on prey consumption; however, establishing feeding habits highly mobile is particularly challenging. Stable isotopes carbon nitrogen (δ 13 C δ 15 N) have been applied to characterize ecology Atlantic bluefin tuna Thunnus thynnus (ABFT) in several important regions; applications Canada are lacking. Here, we used N values ABFT muscle tissue collected 2014-2018 2 foraging grounds along coast evaluate temporally integrated ecologically commercially Populations some small pelagic species these areas depleted, predation by considered a potentially contributor. Isotopic diet reconstructions found that mackerel were dominant southern Gulf St. Lawrence, combination herring sandlance most consumed Scotian Shelf. Diet identified an ontogenetic shift consumption, with more smaller higher consumption as increased size. niche overlap indicated relatively high for adults among years, suggesting did not show substantial inter-annual variation their ecology. Overall, study provides insight into Coast be investigations predator impacts depleted populations.

Language: Английский

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Phospholipid-supplemented diet impacts on growth, blood metrics, reproductive indices, and fatty acid profiles of Pangasianodon hypopthalmus

Aquaculture Reports, Journal Year: 2023, Volume and Issue: 33, P. 101802 - 101802

Published: Nov. 3, 2023

This study explores the effects of phospholipid inclusions in diet Pangasianodon hypopthalmus young adults on growth and physiological parameters. Commercial was subdivided into four groups top coated using (food grade Soy Lecithin) at 0%, 2%, 6%, 10%, feed dry weight resulting an equivalent 5%, 7.39%, 11.93% 15.88% total crude lipid levels experimental diets. After 90 days feeding trials, inclusion 6% (total 11%) significantly improved blood parameters, while 10% resulted a decrease white cells (WBCs) its associated components, suggesting it may have been above optimal level required by fish. Reproductive hormones; 11-ketotestorone 17β-estradiol that were observed showed increase direct proportion following inclusion. Fatty acids composition muscle, liver, gonads show similar trend with dominance C16:0, C18:1n-9, C18:3n-3 tissues. Also, hierarchy fatty tissues order SFA > MUFA PUFA. However, decreased These findings suggest dietary can enhance parameters P. hypopthalmus.

Language: Английский

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Spatiotemporal variability in diet composition of Greenland halibut (Reinhardtius hippoglossoides) from the eastern Canadian Arctic

Journal of Fish Biology, Journal Year: 2023, Volume and Issue: 103(6), P. 1430 - 1444

Published: Aug. 11, 2023

Abstract Greenland halibut ( Reinhardtius hippoglossoides ) sustain one of the most lucrative fisheries in eastern Canadian Arctic and Labrador Sea. This species also plays an important role food web connectivity benthic–pelagic coupling. Despite relatively rich knowledge this species, R. ecology these specific areas remains poorly understood. The main aim study was to characterize diet deepwater fish Sea Davis Hudson Straits predator–prey relationship with northern shrimp Pandalus borealis ), another commercially region. Stomach contents analyses were conducted on 1199 captured from 2018 2020. Small specimens (<20 cm) fed invertebrates, whereas larger individuals (>60 primarily fish, indicative size‐related changes composition. relative abundance environment reflected diet. Location appeared be influential variable feeding patterns. Distinct oceanographic conditions among areas, resulting differences prey availability, could explain results. cod Boreogadus saida redfish Sebastes sp.) selected locations where abundant. These results shed light opportunistic nature its preference for at large size. With rapidly changing waters, a distributional change biomass is expected. Results suggest that increase predatory groundfish system (e.g., lead acute predation competition . By revealing key trophic links within demersal ecosystem, work provides valuable information development ecosystem approaches management

Language: Английский

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Spatial distribution and speciation of mercury in a recovering deepwater redfish (Sebastes mentella) population from St. Lawrence Estuary and Gulf, Canada

Environmental Pollution, Journal Year: 2023, Volume and Issue: 337, P. 122604 - 122604

Published: Sept. 22, 2023

Mercury (Hg) pollution poses a significant threat to the environment, particularly in form of methylmercury (MeHg). However, little is known about distribution and influencing factors Hg deep-sea (>200m) fish, which crucial for assessing potential health risks fish humans. In Canada, deepwater redfish (Sebastes mentella) has been designated as an endangered species. After 25-year fishing moratorium, population St. Lawrence Estuary Gulf recovering, resuming commercial human consumption are expected. This study aimed investigate MeHg total (THg) muscle redfish, well its distribution, assess associated with consumption. The samples (n = 123) were collected by Fisheries Oceans Canada 2019. concentrations THg determined be 93.3 ± 183 ng/g (mean SD, wet weight) 78.2 149 ng/g, respectively. Large (>30 cm) accumulated 20 30 times more than small (17-30 cm). Small from Estuary-Western had higher levels those Laurentian Channel Northeast Gulf, but availability among three areas similar. Significant predictors length, moisture, δ15N, N%. general average rate not anticipated have adverse effects. establishes baseline future monitoring deep water environments this region. Further research required elucidate cause-effect relationships between various environmental/biological parameters accumulation biota.

Language: Английский

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Drivers of growth in strong year classes of the deepwater redfish (Sebastes mentella) population from the Gulf of St. Lawrence derived from otolith increment‐based growth chronologies

Journal of Fish Biology, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 17, 2024

Abstract The case of the deepwater redfish ( Sebastes mentella ) in Gulf St. Lawrence (GSL) is a compelling example drastic fluctuations annual recruitment strength, characteristic spasmodic stocks. After three decades low abundance, emergence consecutive strong year classes 2011–2013 resulted an unprecedented increase biomass. In stocks such as GSL redfish, sustain both biomass and catch for decades. Therefore, understanding growth dynamics these cohorts essential. present study, we reconstructed rates using otolith increment‐based chronology investigated drivers variation early 2010s 1980s. Stock was identified main extrinsic driver growth, suggesting intense competition food at high conspecific density. Warming deep waters GSL, where adult settle, positively correlated with individual growth. However, recent warming cold intermediate layer showed negative correlation likely related to shrinking habitat this water mass provides various cold‐water prey rather than direct effect temperature. Reconstruction trajectories from birth capture emphasized importance carryover effects potential classes. This work provided important first outlook factors driving stock explored midterm consequences density‐dependent pressures on biological parameters population.

Language: Английский

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