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Freshwater tropical fish

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https://www.readbyqxmd.com/read/28727503/first-freshwater-bothriocephalidean-cestoda-from-tropical-south-america-closely-related-to-african-taxa
#1
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...
July 20, 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
#2
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
#3
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
#4
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...
May 18, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28515206/widespread-ecomorphological-convergence-in-multiple-fish-families-spanning-the-marine-freshwater-interface
#5
Aaron M Davis, Ricardo Betancur-R
The theoretical definition and quantification of convergence is an increasingly topical focus in evolutionary research, with particular growing interest on study scales spanning deep phylogenetic divergences and broad geographical areas. While much progress has recently been made in understanding the role of convergence in driving terrestrial (e.g. anole lizards) and aquatic (e.g. cichlids) radiations, little is known about its macroevolutionary effects across environmental gradients. This study uses a suite of recently developed comparative approaches integrating diverse aspects of morphology, dietary data, habitat affiliation and phylogeny to assess convergence across several well-known tropical-temperate fish families in the percomorph suborder Terapontoidei, a clade with considerable phenotypic and ecological diversity radiating in both marine and freshwater environments...
May 17, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28448912/effects-of-low-levels-of-ultraviolet-radiation-on-antioxidant-mechanisms-of-japanese-medaka-oryzias-latipes
#6
Wilson F Ramírez-Duarte, Tomofumi Kurobe, Swee J Teh
Extreme weather events like drought are expected to increase with climate change, which will increase exposure of freshwater fish to ultraviolet (UV) radiation. Compared to fully grown adult fish, fish in early life stages are more susceptible to UV radiation due to the lack of well-developed pigmentation. Even though several studies have described affectation of fish health after exposure to UV radiation, most of the studies have used intensities that are only found on the surface of the earth crust or at shallow depths in water bodies, and little is known about impacts of weaker UV radiation, which can be found in deep water...
April 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28291600/evidence-of-multiple-species-of-chilodonella-protozoa-ciliophora-infecting-australian-farmed-freshwater-fishes
#7
Giana Bastos Gomes, Terrence L Miller, David B Vaughan, Dean R Jerry, Christina McCowan, Tracey L Bradley, Kate S Hutson
Parasitic Chilodonella species, Chilodonella piscicola and Chilodonella hexasticha, cause considerable economic losses globally to freshwater farmed fish production. Some genetic studies of Chilodonella spp. have indicated that many species within the genus may form cryptic species complexes. To understand the diversity of Chilodonella spp. infecting Australian freshwater farmed fish, specimens were isolated from infected barramundi (Lates calcarifer) and Murray cod (Maccullochella peelii) from fish farms in tropical north Queensland (QLD), temperate Victoria (Vic) and New South Wales (NSW) for genetic and morphological analysis...
March 6, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28289806/estrogenic-effects-in-feral-male-common-carp-cyprinus-carpio-from-laguna-de-bay-philippines
#8
Michelle Grace V Paraso, Justinne Kaye C Morales, Angelo A Clavecillas, Ma Suzanneth Epifania G Lola
This study was conducted to measure 17β-estradiol (E2) levels in Laguna de Bay, Philippines and to examine feral male common carp for evidence of exposure to estrogenic pollutants. Analysis of water samples revealed E2 concentrations of 630 and 550 ng/L from the east and west bay of the lake, respectively. Plasma vitellogenin (VTG) in captured fish ranged from 506 to 4083 ng/mL. In comparison to the reference and west bay groups, fish from the east bay had higher plasma VTG concentrations and reduced gonadosomatic index (GSI)...
May 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28205543/ontogenetic-loops-in-habitat-use-highlight-the-importance-of-littoral-habitats-for-early-life-stages-of-oceanic-fishes-in-temperate-waters
#9
Patrick Polte, Paul Kotterba, Dorothee Moll, Lena von Nordheim
General concepts of larval fish ecology in temperate oceans predominantly associate dispersal and survival to exogenous mechanisms such as passive drift along ocean currents. However, for tropical reef fish larvae and species in inland freshwater systems behavioural aspects of habitat selection are evidently important components of dispersal. This study is focused on larval Atlantic herring (Clupea harengus) distribution in a Baltic Sea retention area, free of lunar tides and directed current regimes, considered as a natural mesocosm...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28122040/is-there-a-relationship-between-fish-cannibalism-and-latitude-or-species-richness
#10
Larissa Strictar Pereira, Friedrich Wolfgang Keppeler, Angelo Antonio Agostinho, Kirk O Winemiller
Cannibalism has been commonly observed in fish from northern and alpine regions and less frequently reported for subtropical and tropical fish in more diverse communities. Assuming all else being equal, cannibalism should be more common in communities with lower species richness because the probability of encountering conspecific versus heterospecific prey would be higher. A global dataset was compiled to determine if cannibalism occurrence is associated with species richness and latitude. Cannibalism occurrence, local species richness and latitude were recorded for 4,100 populations of 2,314 teleost fish species...
2017: PloS One
https://www.readbyqxmd.com/read/28004635/host-specificity-and-the-structure-of-helminth-parasite-communities-of-fishes-in-a-neotropical-river-in-mexico
#11
Guillermo Salgado-Maldonado, María Teresa Novelo-Turcotte, Juan Manuel Caspeta-Mandujano, Gabriela Vazquez-Hurtado, Benjamin Quiroz-Martínez, Norman Mercado-Silva, Mario Favila
In a tropical locality of Río La Antigua, Veracruz, Mexico, 11 fish species, represented by 244 individual fish from six freshwater fish families living sympatrically and synchronically, were examined for helminth parasites. A total of 36 taxa of helminths were recorded, 24 autogenic and 12 allogenic forms, including 6 monogeneans, 14 trematodes, 1 cestode, and 15 nematodes. Most helminth taxa were recovered for 10/11 of the component communities we analyzed. The results contribute empirical evidence that host specificity is an important force in the development of helminth communities of freshwater fishes...
2016: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/27914860/microplastics-ingestion-by-a-common-tropical-freshwater-fishing-resource
#12
Jacqueline Santos Silva-Cavalcanti, José Diego B Silva, Elton José de França, Maria Christina Barbosa de Araújo, Felipe Gusmão
Microplastics pollution is widespread in marine ecosystems and a major threat to biodiversity. Nevertheless, our knowledge of the impacts of microplastics in freshwater environments and biota is still very limited. The interaction of microplastics with freshwater organisms and the risks associated with the human consumption of organisms that ingested microplastics remain major knowledge gaps. In this study, we assessed the ingestion of microplastics by Hoplosternum littorale, a common freshwater fish heavily consumed by humans in semi-arid regions of South America...
February 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27886582/crude-extract-of-cyanobacteria-radiocystis-fernandoi-strain-r28-induces-liver-impairments-in-fish
#13
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)...
January 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/27731319/community-based-management-induces-rapid-recovery-of-a-high-value-tropical-freshwater-fishery
#14
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
#15
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
#16
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
#17
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...
December 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
#18
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
#19
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
#20
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
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