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https://www.readbyqxmd.com/read/29768738/unlocking-biodiversity-and-conservation-studies-in-high-diversity-environments-using-environmental-dna-edna-a-test-with-guianese-freshwater-fishes
#1
Kévin Cilleros, Alice Valentini, Luc Allard, Tony Dejean, Roselyne Etienne, Gaël Grenouillet, Amaia Iribar, Pierre Taberlet, Régis Vigouroux, Sébastien Brosse
Determining the species compositions of local assemblages is a prerequisite to understanding how anthropogenic disturbances affect biodiversity. However, biodiversity measurements often remain incomplete due to the limited efficiency of sampling methods. This is particularly true in freshwater tropical environments that host rich fish assemblages, for which assessments are uncertain and often rely on destructive methods. Developing an efficient and non-destructive method to assess biodiversity in tropical freshwaters is highly important...
May 16, 2018: Molecular Ecology Resources
https://www.readbyqxmd.com/read/29764335/comparative-bioaccumulation-and-effects-of-purified-and-cellular-extract-of-cylindrospermopsin-to-freshwater-fish-hoplias-malabaricus
#2
Rodrigo de Cássio da Silva, Sonia Regina Grötzner, Daniele Dietrich Moura Costa, Juan Ramón Esquivel Garcia, Juan Muelbert, Valéria Freitas de Magalhães, Francisco Filipak Neto, Ciro Alberto de Oliveira Ribeiro
Many tropical freshwater ecosystems are impacted by cyanobacteria blooms increasing the risk of cyanotoxins exposure to aquatic organisms while human populations may be exposed by eating fish, drinking water, or dermal swimming. However, few toxicological data are available on the influence of cyanobacteria blooms in particular, cylindrospermopsin (CYN) on Brazilian neotropical fish. A number of studies demonstrated the ability of CYN to bioaccumulate in freshwater organisms and consequently enter the human food chain...
May 15, 2018: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/29643472/high-resolution-behavioral-mapping-of-electric-fishes-in-amazonian-habitats
#3
Manu S Madhav, Ravikrishnan P Jayakumar, Alican Demir, Sarah A Stamper, Eric S Fortune, Noah J Cowan
The study of animal behavior has been revolutionized by sophisticated methodologies that identify and track individuals in video recordings. Video recording of behavior, however, is challenging for many species and habitats including fishes that live in turbid water. Here we present a methodology for identifying and localizing weakly electric fishes on the centimeter scale with subsecond temporal resolution based solely on the electric signals generated by each individual. These signals are recorded with a grid of electrodes and analyzed using a two-part algorithm that identifies the signals from each individual fish and then estimates the position and orientation of each fish using Bayesian inference...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29573589/whole-organism-to-tissue-concentration-ratios-derived-from-an-australian-tropical-dataset
#4
Che Doering, Peter Medley, Blake Orr, David Urban
Whole organism to tissue concentration ratios (CRwo-tissue ) were derived for six wildlife groups (freshwater birds, freshwater bivalves, freshwater fishes, freshwater reptiles, freshwater vascular plants and terrestrial mammals). The wildlife groups and data represented species common to tropical northern Australia. Values of CRwo-tissue were derived for between 6 and 34 elements, depending upon wildlife group. The values were generally similar to international reference values. However, differences for some element-tissue combinations could affect radiation dose estimates for wildlife in certain environmental exposure situations, including uranium mining, where these data are intended to be applied...
March 21, 2018: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29568710/effects-of-landscape-features-on-population-genetic-variation-of-a-tropical-stream-fish-stone-lapping-minnow-garra-cambodgiensis-in-the-upper-nan-river-drainage-basin-northern-thailand
#5
Chaowalee Jaisuk, Wansuk Senanan
Spatial genetic variation of river-dwelling freshwater fishes is typically affected by the historical and contemporary river landscape as well as life-history traits. Tropical river and stream landscapes have endured extended geological change, shaping the existing pattern of genetic diversity, but were not directly affected by glaciation. Thus, spatial genetic variation of tropical fish populations should look very different from the pattern observed in temperate fish populations. These data are becoming important for designing appropriate management and conservation plans, as these aquatic systems are undergoing intense development and exploitation...
2018: PeerJ
https://www.readbyqxmd.com/read/29546518/assessment-of-biochemical-alterations-in-the-neotropical-fish-species-phalloceros-harpagos-after-acute-and-chronic-exposure-to-the-drugs-paracetamol-and-propranolol
#6
Beatriz V R Pereira, Gregorio Nolazco Matus, Monica Jones Costa, André Cordeiro Alves Dos Santos, Elaine C M Silva-Zacarin, Janaina Braga do Carmo, Bruno Nunes
Over time, many pollutants of anthropogenic origin have caused the contamination of aquatic ecosystems. Among several characteristics, these compounds can reach the trophic chain, causing deleterious interactions with the biota. Pharmaceutical substances can be included in this scenario as emerging contaminants that reach the aquatic environment because of direct human and veterinary usage, and release by industrial effluents, as well as through domestic dumping of surplus drugs. The effects of these compounds on exposed organisms have been studied since the 1990s, but ecotoxicological data for such chemicals are still scarce especially concerning aquatic organisms from tropical regions...
March 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29499104/correlated-evolution-of-thermal-niches-and-functional-physiology-in-tropical-freshwater-fishes
#7
Zachary W Culumber, Michael Tobler
The role of ecology in phenotypic and species diversification is widely documented. Nonetheless, numerous nonadaptive processes can shape realized niches and phenotypic variation in natural populations, complicating inferences about adaptive evolution at macroevolutionary scales. We tested for evolved differences in thermal tolerances and their association with the realized thermal niche (including metrics describing diurnal and seasonal patterns of temperature extremes and variability) across a genus of tropical freshwater fishes reared in a standardized environment...
May 2018: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29466506/first-molecular-data-for-lernaea-cyprinacea-copepoda-cyclopoida-infesting-odontesthes-bonariensis-a-commercially-important-freshwater-fish-in-argentina
#8
Iris Aparecida Soares, Víctor Salinas, Omar Del Ponti, Miguel Alberto Mancini, José Luis Luque
Parasitic copepods of the family Lernaeidae are often found infesting freshwater fishes worldwide. They cause lernaeosis, a disease that can lead to serious pathogenic effects on their fish hosts. The most common lernaeid is the Lernaea cyprinacea, which has been widely introduced through importation of tropical fishes, e.g. cyprinids. In South America, it is one of the most common parasites both in wild and in farmed fish in the central region of Argentina. The silverside Odontesthes bonariensis is the most important fish of the sport fisheries of Argentina and one of the fish most affected by lernaeosis...
February 19, 2018: Revista Brasileira de Parasitologia Veterinária, Brazilian Journal of Veterinary Parasitology
https://www.readbyqxmd.com/read/29385189/the-use-of-mosquito-nets-in-fisheries-a-global-perspective
#9
Rebecca Short, Rajina Gurung, Marcus Rowcliffe, Nicholas Hill, E J Milner-Gulland
Free or subsidised mosquito net (MN) distribution has been an increasingly important tool in efforts to combat malaria in recent decades throughout the developing world, making great strides towards eradicating this hugely detrimental disease. However, there has been increasing concern in the natural resource management and healthcare communities over alternative use of MNs, particularly in artisanal fisheries where it has been suggested they pose a threat to sustainability of fish stocks. So far, little evidence has been presented as to the global prevalence and characteristics of MN fishing, limiting global management initiatives and incentives for action across disciplines...
2018: PloS One
https://www.readbyqxmd.com/read/29228349/genome-wide-snps-identify-limits-to-connectivity-in-the-extreme-freshwater-disperser-spangled-perch-leiopotherapon-unicolor-terapontidae
#10
Daniel J Schmidt, Joel A Huey, Jane M Hughes
The utility of restriction-site associated DNA sequencing (RADseq) to resolve fine-scale population structure was tested on an abundant and vagile fish species in a tropical river. Australia's most widespread freshwater fish, the "extreme disperser" Leiopotherapon unicolor was sampled from six locations in an unregulated system, the Daly River in Australia's Northern Territory. Despite an expectation of high connectivity based on life history knowledge of this species derived from arid zone habitats, L...
November 11, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29222047/clown-knifefish-chitala-ornata-oxygen-uptake-and-its-partitioning-in-present-and-future-temperature-environments
#11
Dang Diem Tuong, Tran Bao Ngoc, Vo Thi Nhu Huynh, Do Thi Thanh Huong, Nguyen Thanh Phuong, Tran Ngoc Hai, Tobias Wang, Mark Bayley
It has been argued that tropical ectotherms are more vulnerable to the projected temperature increases than their temperate relatives, because they already live closer to their upper temperature limit. Here we examine the effects of a temperature increase in environmental temperature to 6°C above the present day median temperature (27°C) in the freshwater air-breathing fish Chitala ornata, on aspects of its respiratory physiology in both normoxia and in hypoxia. We found no evidence of respiratory impairment with elevated temperature...
February 2018: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/29217541/designing-river-flows-to-improve-food-security-futures-in-the-lower-mekong-basin
#12
J L Sabo, A Ruhi, G W Holtgrieve, V Elliott, M E Arias, Peng Bun Ngor, T A Räsänen, So Nam
Rivers provide unrivaled opportunity for clean energy via hydropower, but little is known about the potential impact of dam-building on the food security these rivers provide. In tropical rivers, rainfall drives a periodic flood pulse fueling fish production and delivering nutrition to more than 150 million people worldwide. Hydropower will modulate this flood pulse, thereby threatening food security. We identified variance components of the Mekong River flood pulse that predict yield in one of the largest freshwater fisheries in the world...
December 8, 2017: Science
https://www.readbyqxmd.com/read/28942745/a-review-of-the-acanthocephala-parasitising-freshwater-fishes-in-australia
#13
L R Smales, R D Adlard, A Elliot, E Kelly, A J Lymbery, T L Miller, S Shamsi
The acanthocephalan fauna of Australian freshwater fishes was documented from field surveys, a literature survey and examination of specimens registered in Australian museums. From the 4030 fishes, representing 78 of the 354 Australian freshwater fish species (22%), examined for infection seven species of acanthocephalan were recovered. These species comprised five endemic species, three in endemic genera, two species in cosmopolitan genera, one species not fully identified and 1 putative exotic species recovered from eight species of fish...
March 2018: Parasitology
https://www.readbyqxmd.com/read/28870697/a-new-pathogen-myxobolus-holzerae-myxosporea-myxozoa-causing-severe-gill-disease-in-an-indian-major-carp-labeo-rohita-in-a-cold-water-wetland-punjab-india
#14
Aditya Gupta, Harpreet Kaur
The Indian major carp, Labeo rohita Hamilton, 1822 is a tropical freshwater cyprinid fish native to inland waters in Asia. Herein, we describe a novel myxozoan forming plasmodia in the gill lamellae of L. rohita from Ranjit Sagar Wetland in Punjab, India. Myxospores were consistent with the genus Myxobolus, round to elliptical in valvular view, lemon shaped in side view with a characteristic protrusion at the anterior end and a round posterior end; length 7.65 ± 0.07 μm, width 4.62 ± 0.09 μm. There were two polar capsules of equal length, pear shaped, length of polar capsule 2...
October 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28815370/effects-of-small-hydropower-plants-on-mercury-concentrations-in-fish
#15
Elaine C Cebalho, Sergi Díez, Manoel Dos Santos Filho, Claumir Cesar Muniz, Wilkinson Lázaro, Olaf Malm, Aurea R A Ignácio
Although the impacts of large dams on freshwater biota are relatively well known, the effects of small hydropower plants (SHP) are not well investigated. In this work, we studied if mercury (Hg) concentrations in fish rise in two tropical SHP reservoirs, and whether similar effects take place during impoundment. Total Hg concentrations in several fish species were determined at two SHP in the Upper Guaporé River basin floodplain, Brazil. In total, 185 specimens were analysed for Hg content in dorsal muscle and none of them reported levels above the safety limit (500 μg kg(-1)) for fish consumption recommended by the World Health Organisation (WHO)...
October 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28780153/the-catholic-taste-of-broad-tapeworms-multiple-routes-to-human-infection
#16
Andrea Waeschenbach, Jan Brabec, Tomáš Scholz, D Timothy J Littlewood, Roman Kuchta
Broad tapeworms (Cestoda: Diphyllobothriidea) are the principal agents of widespread food-borne cestodosis. Diphyllobothriosis and diplogonoporosis, caused by members of the genera Diphyllobothrium, Diplogonoporus and Adenocephalus, are the most common fish cestodoses with an estimated 20million people infected worldwide, and has seen recent (re)emergences in Europe due to the increasing popularity of eating raw or undercooked fish. Sparganosis is a debilitating and potentially lethal disease caused by the larvae of the genus Spirometra, which occurs throughout much of the (sub)tropics and is caused by the consumption of raw snakes and frogs, and drinking water contaminated by infected copepods...
November 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28727503/first-freshwater-bothriocephalidean-cestoda-from-tropical-south-america-closely-related-to-african-taxa
#17
Tomáš Scholz, Ricardo Massato Takemoto, Roman Kuchta
Regobothrium microhamulinum n. gen. and n. sp. (Bothriocephalidea: Bothriocephalidae) is proposed to accommodate a new cestode from flatfish Catathyridium jenynsii (Chabanaud, 1922) (Pleuronectiformes: Acharidae; type host) and another 3 freshwater fishes of the orders Characiformes, Cyprinodontiformes, and Siluriformes in the Neotropical Region. The new genus is placed in the Bothriocephalidae because it possesses medioventral uterine and mediodorsal genital pores and a follicular vitellarium. Regobothrium n...
December 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28680671/on-the-occurrence-of-three-non-native-cichlid-species-including-the-first-record-of-a-feral-population-of-pelmatolapia-tilapia-mariae-boulenger-1899-in-europe
#18
Juliane A Y Lukas, Jonas Jourdan, Gregor Kalinkat, Sebastian Emde, Friedrich Wilhelm Miesen, Hannah Jüngling, Berardino Cocchiararo, David Bierbach
Thermally influenced freshwater systems provide suitable conditions for non-native species of tropical and subtropical origin to survive and form proliferating populations beyond their native ranges. In Germany, non-native convict cichlids (Amatitlania nigrofasciata) and tilapia (Oreochromis sp.) have established populations in the Gillbach, a small stream that receives warm water discharge from a local power plant. Here, we report on the discovery of spotted tilapia (Pelmatolapia mariae) in the Gillbach, the first record of a reproducing population of this species in Europe...
June 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28588550/the-role-of-peroxisome-proliferator-activated-receptor-gamma-pparg-in-adipogenesis-applying-knowledge-from-the-fish-aquaculture-industry-to-biomedical-research
#19
REVIEW
Rebecca Wafer, Panna Tandon, James E N Minchin
The tropical freshwater zebrafish has recently emerged as a valuable model organism for the study of adipose tissue biology and obesity-related disease. The strengths of the zebrafish model system are its wealth of genetic mutants, transgenic tools, and amenability to high-resolution imaging of cell dynamics within live animals. However, zebrafish adipose research is at a nascent stage and many gaps exist in our understanding of zebrafish adipose physiology and metabolism. By contrast, adipose research within other, closely related, teleost species has a rich and extensive history, owing to the economic importance of these fish as a food source...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28529176/impairment-of-antioxidant-mechanisms-in-japanese-medaka-oryzias-latipes-by-acute-exposure-to-aluminum
#20
Wilson F Ramírez-Duarte, Tomofumi Kurobe, Swee J Teh
Increasing aluminum (Al) concentrations in aquatic habitats as a result of anthropogenic acidification and industrialization is a global issue. Moreover, in extensive areas of the humid tropics and subtropics, high Al concentrations in freshwater are observed because of both naturally low pH and high Al concentrations in soil. Al increases production of reactive oxygen species and enhances oxidative damage in mammals. However, no studies have examined the effect of environmentally relevant concentrations of Al at low pH on oxidative stress in fish...
August 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
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