12,612 results match your criteria fish individuals

Long photoperiod impairs learning in male but not female medaka.

iScience 2021 Jul 25;24(7):102784. Epub 2021 Jun 25.

Institute of Biological and Chemical Systems, Biological Information Processing (IBCS-BIP), Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Day length in conjunction with seasonal cycles affects many aspects of animal biology. We have studied photoperiod-dependent alterations of complex behavior in the teleost, medaka (), a photoperiodic breeder, in a learning paradigm whereby fish have to activate a sensor to obtain a food reward. Medaka were tested under a long (14:10 LD) and short (10:14 LD) photoperiod in three different groups: mixed-sex, all-males, and all-females. Read More

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Fluoxetine results in misleading conclusions on fish behavior.

Ecol Evol 2021 Jul 28;11(14):9707-9714. Epub 2021 Jun 28.

Department of Hydrobiology at Biological and Chemical Research Centre Faculty of Biology University of Warsaw Warsaw Poland.

Fluoxetine is an antidepressant medicine causing relaxation and mood improvement in people, with silencing certain personality traits in some cases. The question arise if such phenomena can be observed in nontarget organisms such as fish. Fluoxetine affects fishes behavior; however, it is not known if the medicine affects its "personality. Read More

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Urban landscapes increase dispersal, gene flow, and pathogen transmission potential in banded mongoose () in northern Botswana.

Ecol Evol 2021 Jul 29;11(14):9227-9240. Epub 2021 Jun 29.

Department of Fish and Wildlife Conservation Virginia Tech Blacksburg VA USA.

Disease transmission can be strongly influenced by the manner in which conspecifics are connected across a landscape and the effects of land use upon these dynamics. In northern Botswana, the territorial and group-living banded mongoose () lives across urban and natural landscapes and is infected with a novel complex pathogen, . Using microsatellite markers amplified from DNA derived from banded mongoose fecal and tissue samples ( = 168), we evaluated population genetic structure, individual dispersal, and gene flow for 12 troops. Read More

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Cooperation and opportunism in Galapagos sea lion hunting for shoaling fish.

Ecol Evol 2021 Jul 21;11(14):9206-9216. Epub 2021 Jun 21.

Department of Animal Behaviour University of Bielefeld Bielefeld Germany.

For predators, cooperation can decrease the cost of hunting and potentially augment the benefits. It can also make prey accessible that a single predator could not catch. The degree of cooperation varies substantially and may range from common attraction to a productive food source to true cooperation involving communication and complementary action by the individuals involved. Read More

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Interindividual plasticity in metabolic and thermal tolerance traits from populations subjected to recent anthropogenic heating.

R Soc Open Sci 2021 Jul 21;8(7):210440. Epub 2021 Jul 21.

Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA.

To better understand temperature's role in the interaction between local evolutionary adaptation and physiological plasticity, we investigated acclimation effects on metabolic performance and thermal tolerance among natural (small estuarine fish) populations from different thermal environments. populations experience large daily and seasonal temperature variations, as well as local mean temperature differences across their large geographical cline. In this study, we use three populations: one locally heated (32°C) by thermal effluence (TE) from the Oyster Creek Nuclear Generating Station, NJ, and two nearby reference populations that do not experience local heating (28°C). Read More

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Re-identification of individuals from images using spot constellations: a case study in Arctic charr ().

R Soc Open Sci 2021 Jul 21;8(7):201768. Epub 2021 Jul 21.

School of Computer Science, University of St Andrews, St Andrews, UK.

The ability to re-identify individuals is fundamental to the individual-based studies that are required to estimate many important ecological and evolutionary parameters in wild populations. Traditional methods of marking individuals and tracking them through time can be invasive and imperfect, which can affect these estimates and create uncertainties for population management. Here we present a photographic re-identification method that uses spot constellations in images to match specimens through time. Read More

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Genomic data support management of anadromous Arctic Char fisheries in Nunavik by highlighting neutral and putatively adaptive genetic variation.

Evol Appl 2021 Jul 27;14(7):1880-1897. Epub 2021 May 27.

Institut de Biologie Intégrative et des Systèmes (IBIS) Université Laval Québec QC Canada.

Distinguishing neutral and adaptive genetic variation is one of the main challenges in investigating processes shaping population structure in the wild, and landscape genomics can help identify signatures of adaptation to contrasting environments. Arctic Char () is an anadromous salmonid and the most harvested fish species by Inuit people, including in Nunavik (Québec, Canada), one of the most recently deglaciated regions in the world. Unlike many other anadromous salmonids, Arctic Char occupy coastal habitats near their natal rivers during their short marine phase restricted to the summer ice-free period. Read More

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Selection on fish personality differs between a no-take marine reserve and fished areas.

Evol Appl 2021 Jul 1;14(7):1807-1815. Epub 2021 May 1.

Centre for Coastal Research Department of Natural Sciences University of Agder Kristiansand Norway.

Marine reserves can protect fish populations by increasing abundance and body size, but less is known about the effect of protection on fish behaviour. We looked for individual consistency in movement behaviours of sea trout in the marine habitat using acoustic telemetry to investigate whether they represent personality traits and if so, do they affect survival in relation to protection offered by a marine reserve. Home range size had a repeatability of 0. Read More

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Morphological and microstructural characteristics of scales in longnose goby Awaous jayakari (Teleostei: Gobiidae): Light and scanning electron microscopy approaches.

Microsc Res Tech 2021 Jul 22. Epub 2021 Jul 22.

Department of Biology, Faculty of Sciences, Shahid Bahonar University of Kerman, Kerman, Iran.

The scale morphology of a native goby, Awaous jayakari (Gobiidae) was studied using scanning electron microscopy and light microscopy. The morphological descriptions were based on the scale's type, shape, and features of the anterior, posterior, and lateral fields. Further characteristics of the focus, circuli, radii, lepidonts, and cteni, were investigated. Read More

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Dietary habits and perceptions of psoriatic patients: .

J Dermatolog Treat 2021 Jul 21:1-25. Epub 2021 Jul 21.

Department of Dermatology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.

Mediterranean diets have been reported to improve psoriasis. Asian food has a unique character and differs from Mediterranean diets. This study compared the dietary intake of psoriatic patients and individuals without psoriasis, and investigated the association between diet and psoriasis severity. Read More

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Northern shrimp Pandalus borealis population collapse linked to climate-driven shifts in predator distribution.

PLoS One 2021 21;16(7):e0253914. Epub 2021 Jul 21.

Division of Biological Monitoring and Assessment, Bureau of Marine Science, Department of Marine Resources, State of Maine, West Boothbay Harbor, Maine, United States of America.

The northern shrimp (Pandalus borealis Krøyer) population in the Gulf of Maine collapsed during an extreme heatwave that occurred across the Northwest Atlantic Ocean in 2012. Northern shrimp is a boreal species, and reaches its southern limit in the Gulf of Maine. Here we investigate proximate causes for the population collapse using data from fishery-independent surveys, environmental monitoring, and the commercial fishery. Read More

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A Pilot Trial: Fish Oil and Metformin Effects on ApoB-Remnants and Triglycerides in Women With Polycystic Ovary Syndrome.

J Endocr Soc 2021 Sep 19;5(9):bvab114. Epub 2021 Jun 19.

Metabolic and Cardiovascular Diseases Laboratory, University of Alberta, Edmonton, AB T6G 2R3, Canada.

Context: Women with polycystic ovary syndrome (PCOS) have increased incidence of atherogenic dyslipidemia and cardiovascular disease (CVD). Interventions targeting atherogenic dyslipidemia to reduce CVD risk are limited in women with PCOS.

Objective: This pilot study was conducted to determine the effect of 12 weeks of high dose fish oil (FO), metformin, and FO as an adjunct to metformin (FO-metformin) therapy on fasting and nonfasting plasma lipids and ApoB-remnants in young women with the metabolic syndrome (MetS) and PCOS. Read More

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September 2021

Social familiarity improves fast-start escape performance in schooling fish.

Commun Biol 2021 Jul 20;4(1):897. Epub 2021 Jul 20.

CNR-IBF, Institute of Biophysics, Pisa, Italy.

Using social groups (i.e. schools) of the tropical damselfish Chromis viridis, we test how familiarity through repeated social interactions influences fast-start responses, the primary defensive behaviour in a range of taxa, including fish, sharks, and larval amphibians. Read More

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A recovery network leads to the natural recolonization of an archipelago and a potential trailing edge refuge.

Ecol Appl 2021 Jul 18:e02416. Epub 2021 Jul 18.

Department of Forest and Wildlife Ecology, University of Wisconsin, Madison, WI, 53706, U.S.A.

Rapid environmental change is reshaping ecosystems and driving species loss globally. Carnivore populations have declined and retracted rapidly and have been the target of numerous translocation projects. Success, however, is complicated when these efforts occur in novel ecosystems. Read More

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Environmental and life-history factors influence inter-colony multidimensional niche metrics of a breeding Arctic marine bird.

Sci Total Environ 2021 Jul 11;796:148935. Epub 2021 Jul 11.

University of Windsor, Windsor, Ontario N9B 3P4, Canada.

Human industrialization has resulted in rapid climate change, leading to wide-scale environmental shifts. These shifts can modify food web dynamics by altering the abundance and distribution of primary producers (ice algae and phytoplankton), as well as animals at higher trophic levels. Methylmercury (MeHg) is a neuro-endocrine disrupting compound which biomagnifies in animals as a function of prey choice, and as such bioavailability is affected by altered food web dynamics and adds an important risk-based dimension in studies of foraging ecology. Read More

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Archerfish respond to a hunting robotic conspecific.

Biol Cybern 2021 Jul 17. Epub 2021 Jul 17.

Department of Mechanical Engineering, Lafayette College, Easton, PA, USA.

While the unique hunting behavior of archerfish has received considerable scientific attention, the specific social cues that govern behaviors like intraspecific kleptoparasitism in the species are less understood. This paper asks whether the use of a robotic facsimile representing an archerfish can elicit a social response if it approximates an archerfish's appearance, along with key features of its hunting behavior. We found that the fish respond to the robot when it hunted, as indicated by decreasing distances between the robot and fish (and among the fish) during the robot's hunting behavior sequence, as well as higher net transfer entropy when the robot was hunting. Read More

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An Indigenous food sovereignty initiative is positively associated with well-being and cultural connectedness in a survey of Syilx Okanagan adults in British Columbia, Canada.

BMC Public Health 2021 Jul 16;21(1):1405. Epub 2021 Jul 16.

Department of Agricultural, Food & Nutritional Science, Faculty of Agricultural, Life & Environmental Sciences, University of Alberta, Edmonton Clinic Health Academy, 11405 87 Ave, Mailbox #54, Edmonton, AB, T6G 2P5, Canada.

Background: For the Syilx Okanagan Nation in Canada, salmon has vital nutritional, cultural, and spiritual significance. Yet, the Okanagan Sockeye salmon population came to near extinction, resulting in a drastic decline in salmon consumption from high historical levels. Thus, restoring and protecting salmon is crucial to Syilx well-being and way of life. Read More

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An integrated path for spatial capture-recapture and animal movement modeling.

Ecology 2021 Jul 16:e03473. Epub 2021 Jul 16.

Marine Mammal Laboratory, NOAA-NMFS Alaska Fisheries Science Center, U.S.A.

Ecologists and conservation biologists increasingly rely on spatial capture-recapture (SCR) and movement modeling to study animal populations. Historically, SCR has focused on population-level processes (e.g. Read More

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J Parasitol 2021 Jul;107(4):547-553

Departamento de Ecología, Facultad de Ciencias, Universidad Católica de la Santísima Concepción P.O. Box 297, Concepción, Chile.

The scarce information on the helminth fauna in otariids from the Southeastern Pacific comes mainly from stranded individuals or killed for that purpose. In this study, we compared the abundance and composition of enteroparasitic assemblages of Otaria flavescens using coprological techniques. Three sampling localities from north to south spanning 2,200 km off the Chilean coast were considered (Iquique, Viña del Mar, and Talcahuano). Read More

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Comparing non-breeding distribution and behavior of red-legged kittiwakes from two geographically distant colonies.

PLoS One 2021 16;16(7):e0254686. Epub 2021 Jul 16.

Alaska Maritime National Wildlife Refuge, U.S. Fish and Wildlife Service, Homer, Alaska, United States of America.

Knowledge of non-breeding distributions is a crucial component to seabird conservation, as conditions during the non-breeding period can play an important role in regulating seabird populations. Specifically, if seabirds from different colonies share the same wintering grounds, conditions in that shared region could have a widespread impact on multiple breeding populations. Red-legged kittiwakes (Rissa brevirostris) are endemic to the Bering Sea and may be especially susceptible to effects of climate change due to a restricted breeding range, small population size, and specialized diet. Read More

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Residency and movement patterns of adult Port Jackson sharks (Heterodontus portusjacksoni) at a breeding aggregation site.

J Fish Biol 2021 Jul 16. Epub 2021 Jul 16.

Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia.

Examining the movement ecology of mesopredators is fundamental to developing an understanding of their biology, ecology and behaviour, as well as the communities and ecosystems they influence. The limited research on the residency and movements of benthic marine mesopredators has primarily used visual tags, which do not allow for the efficient and accurate monitoring of individual space use. Here, we investigated the residency and movement patterns of Port Jackson sharks Heterodontus portusjacksoni (Meyer 1793) at a breeding aggregation site in Jervis Bay, south-eastern Australia, using passive acoustic telemetry to further our understanding of the movement ecology of these important mesopredators. Read More

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Parotocinclus jacksoni, a new hypoptopomatine catfish (Siluriformes: Loricariidae) from the Rio Mamanguape basin, northeastern Brazil.

J Fish Biol 2021 Jul 16. Epub 2021 Jul 16.

Laboratório de Ecologia Aquática, Departamento de Biologia/CCBS, Universidade Estadual da Paraíba, Campina Grande, PB, Brazil.

A new species of Parotocinclus is described from the Rio Mamanguape basin, in the State of Paraíba, Northeastern Brazil. The new species can be distinguished from all of its congeners, except for P. bahiensis, P. Read More

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Just keep it simple? Benchmarking the accuracy of taxonomy assignment software in metabarcoding studies.

Holly M Bik

Mol Ecol Resour 2021 Jul 16. Epub 2021 Jul 16.

Department of Marine Sciences and Institute of Bioinformatics, University of Georgia, Athens, GA, United States of America.

How do you put a name on an unknown piece of DNA? From microbes to mammals, high-throughput metabarcoding studies provide a more objective view of natural communities, overcoming many of the inherent limitations of traditional field surveys and microscopy-based observations (Deiner et al. 2017). Taxonomy assignment is one of the most critical aspects of any metabarcoding study, yet this important bioinformatics task is routinely overlooked. Read More

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Complete mitochondrial genome of the Salt Creek pupfish, : characterization and identification of single nucleotide polymorphisms (SNPs).

Mitochondrial DNA B Resour 2021 5;6(8):2229-2232. Epub 2021 Jul 5.

Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA, USA.

The Salt Creek pupfish, Miller, 1943 is endemic to Death Valley, California, USA, and resides as a single population within one of the most extreme inland aquatic environments capable of supporting fish. Here we report the sequencing of complete 16,499 base pair (bp) mitochondrion genomes from four individuals. The mitochondrial genome of comprises 13 protein-coding regions, 12S and 16S rRNAs, 22 tRNAs, and an 832 bp D-loop region. Read More

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Congenital Asplenia Interrupts Immune Homeostasis and Leads to Excessive Systemic Inflammation in Zebrafish.

Front Cell Infect Microbiol 2021 28;11:668859. Epub 2021 Jun 28.

Institute of Three Gorges Ecological Fisheries of Chongqing, College of Fisheries, Southwest University, Chongqing, China.

Splenectomy or congenital asplenia in humans increases susceptibility to infections. We have previously reported that congenital asplenia in zebrafish reduces resistance to infection. However, the molecular mechanism of systemic immune response in congenitally asplenic individuals is largely unexplored. Read More

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Distribution of Sprattus sprattus phalericus (Risso, 1827) and zooplankton near the Black Sea redoxcline.

J Fish Biol 2021 Jul 14. Epub 2021 Jul 14.

A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russia.

Understanding what environmental drivers influence marine predator-prey relationships can be key to managing and protecting ecosystems, especially in the face of future climate change risks. This is especially important in environments such as the Black Sea, where strong biogeochemical gradients can drive marine habitat partitioning and ecological interactions. We used underwater video recordings in the north-eastern Black Sea in November 2013 to observe the distribution and behaviour of the Black Sea sprat (Sprattus sprattus phalericus, Risso 1827) and its zooplankton prey. Read More

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Running on empty? Freshwater feeding by spawning anadromous alewife Alosa pseudoharengus.

J Fish Biol 2021 Jul 14. Epub 2021 Jul 14.

Biology Department, Acadia University, Wolfville, Nova Scotia, Canada.

Anadromous alewife Alosa pseudoharengus (n = 202; mean ± S.D. fork length = 231 ± 14 mm) were captured from 10 May to 27 June 2018 in an upper watershed lake on the Isthmus of Chignecto, Canada (45° 57' N, 64° 14' W). Read More

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Seasonal dynamics of mesozooplankton biomass over a sub-Arctic continental shelf.

Ecol Evol 2021 Jul 25;11(13):8713-8729. Epub 2021 May 25.

Faculty of Biosciences and Aquaculture Nord University Bodø Norway.

Mesozooplankton research in high latitude ecosystems tends to focus on different life stages of spp. due to its biomass dominance and trophic roles. However, a complex seasonal succession of abundant smaller mesozooplankton taxa suggests that the ecological functioning of the mesozooplankton communities is more complicated. Read More

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Long-term monitoring of a brown trout (Salmo trutta) population reveals kin-associated migration patterns and contributions by resident trout to the anadromous run.

BMC Ecol Evol 2021 Jul 13;21(1):143. Epub 2021 Jul 13.

Department of Biology, Aarhus University, Ny Munkegade 114, 8000, Aarhus C, Denmark.

Background: In species showing partial migration, as is the case for many salmonid fishes, it is important to assess how anthropogenic pressure experienced by migrating individuals affects the total population. We focused on brown trout (Salmo trutta) from the Guddal River in the Norwegian Hardanger Fjord system, which encompasses both resident and anadromous individuals. Aquaculture has led to increased anthropogenic pressure on brown trout during the marine phase in this region. Read More

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Evolutionary management of coral-reef fisheries using phylogenies to predict density dependence.

Ecol Appl 2021 Jul 13:e02409. Epub 2021 Jul 13.

University of Guam Marine Laboratory, UOG Station, Mangilao, Guam, 96923.

Harvesting models are based upon the ideology that removing large, old individuals provides space for young, fast-growing counterparts that can maximize (fisheries) yields while maintaining population and ecosystem stability. Yet, this compensatory density dependent response has rarely been examined in multispecies systems. We combined extensive datasets from coral-reef fisheries across a suite of Pacific islands and first provided unique context to the universal assumptions of compensatory density dependence. Read More

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