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https://www.readbyqxmd.com/read/27886582/crude-extract-of-cyanobacteria-radiocystis-fernandoi-strain-r28-induces-liver-impairments-in-fish
#1
M G Paulino, D Tavares, F Bieczynski, P G Pedrão, N E S Souza, M M Sakuragui, C M Luquet, A P Terezan, J B Fernandes, A Giani, M N Fernandes
Radiocystis fernandoi R28 strain is a cyanobacterium which produces mostly the RR and YR microcystin variants (MC-RR and MC-YR, respectively). The effects of crude extract of the R. fernandoi strain R28 were evaluated on the protein phosphatases and on the structure and ultrastructure of the liver of the Neotropical fish, Hoplias malabaricus, after acute and subchronic exposure. Concomitantly, the accumulation of the majority of MCs was determined in the liver and muscle. The fish were exposed to 120.60 MC-RR+MC-LR kg-fish(-1) (=100μg MC-LReq kg-fish(-1)) for 12 and 96h (one single dose, acute exposure) and 30days (one similar dose every 72h, subchronic exposure)...
November 17, 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27731319/community-based-management-induces-rapid-recovery-of-a-high-value-tropical-freshwater-fishery
#2
João Vitor Campos-Silva, Carlos A Peres
Tropical wetlands are highly threatened socio-ecological systems, where local communities rely heavily on aquatic animal protein, such as fish, to meet food security. Here, we quantify how a 'win-win' community-based resource management program induced stock recovery of the world's largest scaled freshwater fish (Arapaima gigas), providing both food and income. We analyzed stock assessment data over eight years and examined the effects of protected areas, community-based management, and landscape and limnological variables across 83 oxbow lakes monitored along a ~500-km section of the Juruá River of Western Brazilian Amazonia...
October 12, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27725426/application-of-zebrafish-model-to-environmental-toxicology
#3
Yuta Komoike, Masato Matsuoka
Recently, a tropical freshwater fish, the zebrafish, has been generally used as a useful model organism in various fields of life science worldwide. The zebrafish model has also been applied to environmental toxicology; however, in Japan, it has not yet become widely used. In this review, we will introduce the biological and historical backgrounds of zebrafish as an animal model and their breeding. We then present the current status of toxicological experiments using zebrafish that were treated with some important environmental contaminants, including cadmium, organic mercury, 2,3,7,8-tetrachlorodibenzo-p-dioxin, and tributyltin...
2016: Nihon Eiseigaku Zasshi. Japanese Journal of Hygiene
https://www.readbyqxmd.com/read/27599938/streptococcus-iniae-cpsg-alters-capsular-carbohydrate-composition-and-is-a-cause-of-serotype-switching-in-vaccinated-fish
#4
Candice Heath, Christine M Gillen, Panagiotis Chrysanthopoulos, Mark J Walker, Andrew C Barnes
Streptococcus iniae causes septicaemia and meningitis in marine and freshwater fish wherever they are farmed in warm-temperate and tropical regions. Although serotype specific, vaccination with bacterins (killed bacterial cultures) is largely successful and vaccine failure occurs only occasionally through emergence of new capsular serotypes. Previously we showed that mutations in vaccine escapes are restricted to a limited repertoire of genes within the 20-gene capsular polysaccharide (cps) operon. cpsG, a putative UDP-galactose 4-epimerase, has three sequence types based on the insertion or deletion of the three amino acids leucine, serine and lysine in the substrate binding site of the protein...
September 25, 2016: Veterinary Microbiology
https://www.readbyqxmd.com/read/27575969/detection-of-leptospira-spp-in-wild-phrynops-geoffroanus-geoffroy-s-side-necked-turtle-in-urban-environment
#5
J P Oliveira, A E Kawanami, A S L Silva, D G Chung, K Werther
Leptospira spp., a zoonotic agent relevant for public health, occurs frequently in tropical regions. The aquatic environment represents a viable survival and transmission pathway. This study aimed to investigate the presence of anti-Leptospira spp. antibodies in Phrynops geoffroanus (Geoffroy's side-necked turtle) serum samples using the microagglutination test (MAT), and Leptospira spp. in gastric and cloacal lavage samples using the polymerase chain reaction (PCR) technique. Antibodies against nine different Leptospira spp...
August 26, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27547357/evolution-of-opercle-bone-shape-along-a-macrohabitat-gradient-species-identification-using-mtdna-and-geometric-morphometric-analyses-in-neotropical-sea-catfishes-ariidae
#6
Madlen Stange, Gabriel Aguirre-Fernández, Richard G Cooke, Tito Barros, Walter Salzburger, Marcelo R Sánchez-Villagra
Transitions between the marine and freshwater macrohabitat have occurred repeatedly in the evolution of teleost fishes. For example, ariid catfishes have moved from freshwater to marine environments, and vice versa. Opercles, a skeletal feature that has been shown to change during such transitions, were subjected to 2D geometric morphometric analyses in order to investigate evolutionary shape changes during habitat transition in ariid catfishes and to test the influence of habitat on shape changes. A mtDNA marker, which proved useful in previous studies, was used to verify species identities...
August 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/27503877/climate-warming-reduces-fish-production-and-benthic-habitat-in-lake-tanganyika-one-of-the-most-biodiverse-freshwater-ecosystems
#7
Andrew S Cohen, Elizabeth L Gergurich, Benjamin M Kraemer, Michael M McGlue, Peter B McIntyre, James M Russell, Jack D Simmons, Peter W Swarzenski
Warming climates are rapidly transforming lake ecosystems worldwide, but the breadth of changes in tropical lakes is poorly documented. Sustainable management of freshwater fisheries and biodiversity requires accounting for historical and ongoing stressors such as climate change and harvest intensity. This is problematic in tropical Africa, where records of ecosystem change are limited and local populations rely heavily on lakes for nutrition. Here, using a ∼1,500-y paleoecological record, we show that declines in fishery species and endemic molluscs began well before commercial fishing in Lake Tanganyika, Africa's deepest and oldest lake...
August 23, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27503203/zebrafish-models-of-cardiovascular-disease
#8
Despina Bournele, Dimitris Beis
Cardiovascular disease (CVD) is one of the leading causes of death worldwide. The most significant risk factors associated with the development of heart diseases include genetic and environmental factors such as hypertension, high blood cholesterol levels, diabetes, smoking, and obesity. Coronary artery disease accounts for the highest percentage of CVD deaths and stroke, cardiomyopathies, congenital heart diseases, heart valve defects and arrhythmias follow. The causes, prevention, and treatment of all forms of cardiovascular disease remain active fields of biomedical research, with hundreds of scientific studies published on a weekly basis...
November 2016: Heart Failure Reviews
https://www.readbyqxmd.com/read/27453692/a-minute-ostracod-crustacea-cytheromatidae-from-the-miocene-solim%C3%A3%C2%B5es-formation-western-amazonia-brazil-evidence-for-marine-incursions
#9
Martin Gross, Maria Ines F Ramos, Werner E Piller
A huge wetland (the 'Pebas system') covered western Amazonia during the Miocene, hosting a highly diverse and endemic aquatic fauna. One of the most contentious issues concerns the existence, potential pathways and effects of marine incursions on this ecosystem. Palaeontological evidences (body fossils) are rare. The finding of a new, presumably marine ostracod species (Pellucistoma curupira sp. nov.) in the upper middle Miocene Solimões Formation initiated a taxonomic, ecological and biogeographical review of the genus Pellucistoma...
July 2, 2016: Journal of Systematic Palaeontology
https://www.readbyqxmd.com/read/27376756/parasites-of-freshwater-fishes-and-the-great-american-biotic-interchange-a-bridge-too-far
#10
A Choudhury, M García-Varela, G Pérez-Ponce de León
We examine the extent to which adult helminths of freshwater fishes have been part of the Great American Biotic Interchange (GABI), by integrating information in published studies and new data from Panama with fish biogeography and Earth history of Middle America. The review illustrates the following: (1) the helminth fauna south of the Trans-Mexican Volcanic Belt, and especially south of the Isthmus of Tehuantepec, shows strong Neotropical affinities; (2) host-parasite associations follow principles of the 'biogeographic core fauna' in which host-lineage specificity is pronounced; (3) phylogenetic analysis of the widespread freshwater trematode family Allocreadiidae reveals a complex history of host-shifting and co-diversification involving mainly cyprinodontiforms and characids; (4) allocreadiids, monogeneans and spiruridan nematodes of Middle American cyprinodontiforms may provide clues to the evolutionary history of their hosts; and (5) phylogenetic analyses of cryptogonimid trematodes may reveal whether or how cichlids interacted with marine or brackish-water environments during their colonization history...
July 4, 2016: Journal of Helminthology
https://www.readbyqxmd.com/read/27260186/effects-of-diazinon-on-the-lymphocytic-cholinergic-system-of-nile-tilapia-fish-oreochromis-niloticus
#11
G A Toledo-Ibarra, K J G Díaz-Resendiz, L Pavón-Romero, A E Rojas-García, I M Medina-Díaz, M I Girón-Pérez
Fish rearing under intensive farming conditions can be easily disturbed by pesticides, substances that have immunotoxic properties and may predispose to infections. Organophosphorus pesticides (OPs) are widely used in agricultural activities; however, the mechanism of immunotoxicity of these substances is unclear. The aim of this study was to evaluate the effect of diazinon pesticides (OPs) on the cholinergic system of immune cells as a possible target of OP immunotoxicity. We evaluated ACh levels and cholinergic (nicotinic and muscarinic) receptor concentration...
August 2016: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/27074006/molecular-phylogeny-and-biogeography-of-the-amphidromous-fish-genus-dormitator-gill-1861-teleostei-eleotridae
#12
Sesángari Galván-Quesada, Ignacio Doadrio, Fernando Alda, Anabel Perdices, Ruth Gisela Reina, Martín García Varela, Natividad Hernández, Antonio Campos Mendoza, Eldredge Bermingham, Omar Domínguez-Domínguez
Species of the genus Dormitator, also known as sleepers, are representatives of the amphidromous freshwater fish fauna that inhabit the tropical and subtropical coastal environments of the Americas and Western Africa. Because of the distribution of this genus, it could be hypothesized that the evolutionary patterns in this genus, including a pair of geminate species across the Central American Isthmus, could be explained by vicariance following the break-up of Gondwana. However, the evolutionary history of this group has not been evaluated...
2016: PloS One
https://www.readbyqxmd.com/read/27069606/from-species-to-communities-the-signature-of-recreational-use-on-a-tropical-river-ecosystem
#13
Amy E Deacon, Hideyasu Shimadzu, Maria Dornelas, Indar W Ramnarine, Anne E Magurran
Disturbance can impact natural communities in multiple ways. However, there has been a tendency to focus on single indicators of change when examining the effects of disturbance. This is problematic as classical diversity measures, such as Shannon and Simpson indices, do not always detect the effects of disturbance. Here, we instead take a multilevel, hierarchical approach, looking for signatures of disturbance in the capacity and diversity of the community, and also in allocation and demography at the population level...
December 2015: Ecology and Evolution
https://www.readbyqxmd.com/read/27026508/differential-expression-of-skin-mucus-c-type-lectin-in-two-freshwater-eel-species-anguilla-marmorata-and-anguilla-japonica
#14
Shigeyuki Tsutsui, Tatsuki Yoshinaga, Kaoru Komiya, Hiroka Yamashita, Osamu Nakamura
Two types of lactose-specific lectins, galectin (AJL-1) and C-type lectin (AJL-2), were previously identified in the mucus of adult Anguilla japonica. Here, we compared the expression profiles of these two homologous lectins at the adult and juvenile stages between the tropical eel Anguilla marmorata and the temperate eel A. japonica. Only one lectin, predicted to be an orthologue of AJL-1 by LC-MS/MS, was detected in the mucus of adult A. marmorata. We also found that an orthologous gene to AJL-2 was expressed at very low levels, or not at all, in the skin of adult A...
August 2016: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/26965895/getting-into-hot-water-sick-guppies-frequent-warmer-thermal-conditions
#15
Ryan S Mohammed, Michael Reynolds, Joanna James, Chris Williams, Azad Mohammed, Adesh Ramsubhag, Cock van Oosterhout, Jo Cable
Ectotherms depend on the environmental temperature for thermoregulation and exploit thermal regimes that optimise physiological functioning. They may also frequent warmer conditions to up-regulate their immune response against parasite infection and/or impede parasite development. This adaptive response, known as 'behavioural fever', has been documented in various taxa including insects, reptiles and fish, but only in response to endoparasite infections. Here, a choice chamber experiment was used to investigate the thermal preferences of a tropical freshwater fish, the Trinidadian guppy (Poecilia reticulata), when infected with a common helminth ectoparasite Gyrodactylus turnbulli, in female-only and mixed-sex shoals...
July 2016: Oecologia
https://www.readbyqxmd.com/read/26936120/phosphorus-as-a-driver-of-nitrogen-limitation-and-sustained-eutrophic-conditions-in-bolinao-and-anda-philippines-a-mariculture-impacted-tropical-coastal-area
#16
Charissa M Ferrera, Atsushi Watanabe, Toshihiro Miyajima, Maria Lourdes San Diego-McGlone, Naoko Morimoto, Yu Umezawa, Eugene Herrera, Takumi Tsuchiya, Masaya Yoshikai, Kazuo Nadaoka
The dynamics of nitrogen (N) and phosphorus (P) was studied in mariculture areas around Bolinao and Anda, Philippines to examine its possible link to recurring algal blooms, hypoxia and fish kills. They occur despite regulation on number of fish farm structures in Bolinao to improve water quality after 2002, following a massive fish kill in the area. Based on spatiotemporal surveys, coastal waters remained eutrophic a decade after imposing regulation, primarily due to decomposition of uneaten and undigested feeds, and fish excretions...
April 15, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/26910504/the-value-of-crossdating-to-retain-high-frequency-variability-climate-signals-and-extreme-events-in-environmental-proxies
#17
Bryan A Black, Daniel Griffin, Peter van der Sleen, Alan D Wanamaker, James H Speer, David C Frank, David W Stahle, Neil Pederson, Carolyn A Copenheaver, Valerie Trouet, Shelly Griffin, Bronwyn M Gillanders
High-resolution biogenic and geologic proxies in which one increment or layer is formed per year are crucial to describing natural ranges of environmental variability in Earth's physical and biological systems. However, dating controls are necessary to ensure temporal precision and accuracy; simple counts cannot ensure that all layers are placed correctly in time. Originally developed for tree-ring data, crossdating is the only such procedure that ensures all increments have been assigned the correct calendar year of formation...
July 2016: Global Change Biology
https://www.readbyqxmd.com/read/26899125/dietary-supplementation-of-zeolite-on-growth-performance-immunological-role-and-disease-resistance-in-channa-striatus-against-aphanomyces-invadans
#18
Suntharam Jawahar, Adil Nafar, Krishnan Vasanth, Mohamed Saiyad Musthafa, Jesu Arockiaraj, Chellam Balasundaram, Ramasamy Harikrishnan
Epizootic Ulcerative Syndrome (EUS) caused by Aphanomyces invadans which is a primary fungal parasitic pathogen, inflicts serious economic loss in tropical freshwater fish including snakehead murrel, Channa striatus. In the present study with an aim to circumvent the adverse effects of the traditional measures in graded levels (2%, 4%, and 6%) of Zeolite enriched diet on growth performance, hematology, immunological response, and disease resistance in C. striatus against A. invadans is reported. The final weight (FW), specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), and average daily gain (ADG) were significantly high in infected fish fed with 4% or 6% Zeolite incorporated diets on 4th week...
April 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/26898991/fish-condition-factor-peroxisome-proliferator-activated-receptors-and-biotransformation-responses-in-sarotherodon-melanotheron-from-a-contaminated-freshwater-dam-awba-dam-in-ibadan-nigeria
#19
Aina O Adeogun, Oju R Ibor, Anyebe B Onoja, Augustine Arukwe
The relationship between condition factor (CF), peroxisome proliferator-activated receptors (PPARs), phase 1 biotransformation (CYP1A isoforms) and contaminant burden has been studied in Sarotherodon melanotheron from a contaminated tropical freshwater dam (Awba Dam) and compared to a reference site (Modete Dam) in Southwest, Nigeria. A total of 89 fish (57 males and 32 females) was collected from Awba Dam and 95 fish (48 males and 47 females) from the reference site. In general, fish sampled from Awba Dam were bigger than reference site...
October 2016: Marine Environmental Research
https://www.readbyqxmd.com/read/26897087/endocrine-disruptor-molecular-responses-occurrence-of-intersex-and-gonado-histopathological-changes-in-tilapia-species-from-a-tropical-freshwater-dam-awba-dam-in-ibadan-nigeria
#20
Aina O Adeogun, Kolawole Onibonoje, Oju R Ibor, Roseline A Omiwole, Azubuike V Chukwuka, Alex O Ugwumba, Adiaha A A Ugwumba, Augustine Arukwe
In the present study, the occurrence of endocrine disruptive responses in Tilapia species from Awba Dam has been investigated, and compared to a reference site (Modete Dam). The Awba Dam is a recipient of effluents from University of Ibadan (Nigeria) and several other anthropogenic sources. A total of 132 Tilapia species (Sarotherodon malenotheron (n=57 and 32, males and females, respectively) and Tilapia guineensis (n=23 and 20, males and females, respectively)) were collected from June to September 2014. At the reference site, samples of adult male and female S...
May 2016: Aquatic Toxicology
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