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https://www.readbyqxmd.com/read/29022141/a-new-species-of-trichodina-ehrenberg-1830-ciliophora-trichodinidae-infecting-farmed-clarias-gariepinus-burchell-siluriformes-clariidae-in-cuba
#1
Fernando Lucas Prats León, Mercedes Martínez Pérez
A new species of Trichodina Ehrenberg, 1830 collected from the skin and fins of farmed North African catfish Clarias gariepinus (Burchell) fingerlings, is described. The new species can be distinguished from other trichodinids by the characteristics of the adhesive disc, especially by the great number of denticles. Trichodina merciae n. sp. is morphologically similar to T. renicola (Mueller, 1931) and T. marplatensis Martorelli, Marcotegui & Alda, 2008, in the number of denticles, but differs in the morphometric data, denticle morphology, environment and location...
October 11, 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/29017851/seasonal-ovarian-immunolocalization-of-neuropeptide-y-and-its-role-in-steriodogenesis-in-asian-catfish-clarias-batrachus
#2
Priyadarshini, Bechan Lal
The present study was undertaken to examine the cellular localization and potential steroidogenic role of neuropeptide Y (NPY) in the ovary of the freshwater catfish, Clarias batrachus. NPY-immunoreaction was observed in the follicular cells (granulosa and thecal cells) in the growing ovarian follicles, and the intensity of staining increased steadily from the initiation of follicular development until follicles were fully grown. Thereafter as follicles matured the stain intensity decreased. Positive correlations were found between NPY expression and the ovarian levels of 17β-estradiol, testosterone, and activities of 3β-hydroxysteroid dehydrogenase (3β-HSD) and 17β-hydroxysteroid dehydrogenase (17β-HSD) in the ovary...
October 7, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28959625/human-health-risk-assessment-of-polycyclic-aromatic-hydrocarbons-pahs-in-smoked-fish-species-from-markets-in-southern-nigeria
#3
Isioma Tongo, Ozekeke Ogbeide, Lawrence Ezemonye
Polycyclic Aromatic Hydrocarbons (PAHs) levels in four commonly consumed smoked fish species from markets in Southern Nigeria were assessed to evaluate possible human health risks associated with consumption. Varying levels of PAH congeners were observed in the fish tissues with the highest total concentration of PAHs in Scomber scombrus. High concentrations of benzo(a)pyrene was observed in Clarias gariepinus and Ethmalosa fimbriata with values above the guideline value of 0.05 mg/kg. The Dietary Daily Intake (DDI) value for total PAHs (∑PAHs) was highest for S...
2017: Toxicology Reports
https://www.readbyqxmd.com/read/28944046/growth-performance-and-feed-utilization-of-african-catfish-clarias-gariepinus-fed-a-commercial-diet-and-reared-in-the-biofloc-system-enhanced-with-probiotic
#4
Iskandar Putra, Rusliadi Rusliadi, Muhammad Fauzi, Usman M Tang, Zainal A Muchlisin
Background The objective of the present study was to evaluate the growth performance and feed utilization of African catfish Clarias gariepinus fed a commercial diet and reared in the biofloc system enhanced with probiotic. Methods The treatment was the frequency of probiotic application into the cultured system, namely, 5-day interval, 10-day interval, and 15-day interval for 60 days of experiment. Biofloc culture was grown in an experiment tank (vol. 2000 L) by mixing the probiotic ( Bacillus sp.) 10 mL and molasses 200 mL per liter of water...
2017: F1000Research
https://www.readbyqxmd.com/read/28940578/candidatus-actinochlamydia-pangasiae-sp-nov-chlamydiales-actinochlamydiaceae-a-bacterium-associated-with-epitheliocystis-in-pangasianodon-hypophthalmus
#5
N Sood, P K Pradhan, D K Verma, M K Yadav, Ravindra, A K Dev, T R Swaminathan, N K Sood
Chlamydial infections are recognised as causative agent of epitheliocystis, reported from over 90 fish species. In the present study, the farmed striped catfish Pangasianodon hypophthalmus (14-15 cm, 70-90 g) with a history of cumulative mortality of about 23% during June and July 2015, were brought to the laboratory. The histopathological examination of gills from the affected fish revealed presence of granular basophilic intracellular inclusions, mostly at the base of the interlamellar region and in gill filaments...
September 22, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28940526/aggression-supersedes-individual-oxygen-demand-to-drive-group-air-breathing-in-a-social-catfish
#6
Shaun S Killen, Andrew J Esbaugh, Nicolas Martins, F Tadeu Rantin, David J McKenzie
Group-living is widespread among animals and comes with numerous costs and benefits. To date, research examining group-living has focused on trade-offs surrounding foraging, while other forms of resource acquisition have been largely overlooked. Air breathing has evolved in many fish lineages, allowing animals to obtain oxygen in hypoxic aquatic environments. Breathing air increases the threat of predation, so some species perform group air breathing, to reduce individual risk. Within species, air breathing can be influenced by metabolic rate as well as personality, but the mechanisms of group air breathing remain unexplored...
September 20, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28937913/dietary-euphorbia-hirta-extract-improved-the-resistance-of-african-catfish-clarias-gariepinus-to-aeromonas-hydrophila
#7
Atefeh Sheikhlar, Goh Yong Meng, Razak Alimon, Nicholas Romano, Mahdi Ebrahimi
Aqueous and methanol extracts of lemon (Citrus lemon) peel, Euphorbia hirta (aerial parts) and fenugreek (Trigonella foenum-graecum) seeds were tested for their in vitro antimicrobial activities against the bacterium Aeromonas hydrophila. A swab paper disk method showed the methanol extract of E. hirta (EHE) had the largest inhibition zone and the lowest minimal inhibitory concentration compared to all other herbal extracts. Based on these results, EHE was included in the diets of African catfish (Clarias gariepinus) at 0 (control), 2, 5 or 7 g/kg diet (experiment 1)...
September 22, 2017: Journal of Aquatic Animal Health
https://www.readbyqxmd.com/read/28926836/percutaneous-biliary-balloon-dilation-impact-of-an-institutional-three-session-protocol-on-patients-with-benign-anastomotic-strictures-of-hepatojejunostomy
#8
Matias E Czerwonko, Pablo Huespe, Oscar Mazza, Martin de Santibanes, Rodrigo Sanchez-Claria, Juan Pekolj, Miguel Ciardullo, Eduardo de Santibanes, Sung Ho Hyon
BACKGROUND: Percutaneous biliary balloon dilation (PBBD) stands as a safe, useful, and inexpensive treatment procedure performed on patients with benign anastomotic stricture of Roux-en-Y hepatojejunostomy (BASH). However, the optimal mode of application is still under discussion. METHODS: A retrospective cohort study was conducted including patients admitted between 2008 and 2015 with diagnosis of BASH. Patients were divided into 2 groups: group I (n = 22), included patients treated after the implementation of an institutional protocol of 3 PBBD sessions within a fixed time interval and group II (n = 24) consisted of our historical control of patients who underwent one or 2 dilation sessions...
September 20, 2017: Digestive Surgery
https://www.readbyqxmd.com/read/28923704/cloning-characterisation-docking-and-expression-analysis-of-3-beta-hydroxysteroid-dehydrogenase-during-ontogenetic-development-and-annual-reproductive-cycles-in-catfish-clarias-batrachus
#9
Irfan Ahmad Bhat, Mohd Ashraf Rather, Mir Ishfaq Nazir, Gireesh-Babu Pathakota, Mukunda Goswami, J K Sundaray, Rupam Sharma
Fish like higher animals, have a well-defined mechanism to produce sex steroids that play a critical role in gonadal development and maturation. In this study, we aimed to analyse the expression pattern of 3β-HSD in different tissues, during ontogenetic development and gonadal recrudescence of Clarias batrachus. A full-length cDNA of 1617 bp including an open reading frame (ORF) of 1125 bp encoding 374 amino acids was isolated from testes of C. batrachus. The docking analysis between C. batrachus 3β-HSD protein and eurycomanone exhibited high binding affinity toward each other with total energy of -108...
September 11, 2017: Theriogenology
https://www.readbyqxmd.com/read/28919451/biphasic-modulation-of-neuro-and-interrenal-steroidogenesis-in-juvenile-african-sharptooth-catfish-clarias-gariepinus-exposed-to-waterborne-di-2-ethylhexyl-phthalate
#10
Augustine Arukwe, Oju R Ibor, Aina O Adeogun
Receptor (i.e. genomic) and non-receptor (or non-genomic) effects of endocrine toxicology have received limited or almost non-existent attention for tropical species and regions. In the present study, we have evaluated the effects of di-(2-ethylhexyl) phthalate (DEHP) on neuro- and interrenal steroidogenesis of the African catfish (Clarias gariepinus) using molecular, immunochemical and physiological approaches. Juvenile fish (mean weight and length: 5.6±0.6g and 8.2±1.2cm, respectively), were randomly distributed into ten 120L rectangular glass tanks containing 60L of dechlorinated tap water, at 50 fish per exposure group...
December 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28917943/chronic-fluoride-exposure-exacerbates-headkidney-pathology-and-causes-immune-commotion-in-clarias-gariepinus
#11
Rashmi Singh, Md Arafat Hussain, Jai Kumar, Manmohan Kumar, Usha Kumari, Shibnath Mazumder
The current study was aimed to understand the effects of chronic fluoride exposure on fish immune system. African sharp tooth catfish (Clarias gariepinus) were exposed to 73.45mg/L of fluoride corresponding to 1/10 96h LC50 for 30 d and the effects on general fish health and several immune parameters were studied. Chronic fluoride exposure led to significant alteration in serum biochemical parameters including alkaline phosphatase, alanine transaminase, aspartate transaminase, triglycerides, cholesterol and blood urea nitrogen levels revealing the detrimental effect of fluoride on general fish health...
September 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28893476/growth-hormone-releasing-peptide-6-enhanced-antibody-titers-against-subunit-antigens-in-mice-balb-c-tilapia-oreochromis-niloticus-and-african-catfish-clarias-gariepinus
#12
Rebeca Martínez, Liz Hernández, Lázaro Gil, Yamila Carpio, Antonio Morales, Fidel Herrera, Alina Rodríguez-Mallón, Yeny Leal, Aracelys Blanco, Mario Pablo Estrada
Modern subunit vaccines have excellent safety profiles and improved tolerability, but do not elicit strong immune responses without the addition of adjuvants. Developing a safe and affective adjuvant remains a challenge for peptide-based vaccine design. Growth Hormone Releasing Peptide-6 (GHRP-6) is one of the earliest-developed, synthetic, peptidyl growth hormone secretagogue receptor agonists. These compounds mimic the effect of the endogenous ligand, ghrelin. In the present study, we evaluated the ability of GHRP-6 to enhance the humoral immune response against co-injected antigens in mice, tilapia and African catfish...
September 8, 2017: Vaccine
https://www.readbyqxmd.com/read/28890764/lactococcus-lactis-strain-a5-producing-nisin-like-bacteriocin-active-against-gram-positive-and-negative-bacteria
#13
Nur Shazana Azhar, Noor Hasniza Md Zin, Tengku Haziyamin Tengku Abdul Hamid
In this study, a Lactic acid bacteria (LAB) strain was isolated on MRS medium from gastro-intestinal tissues of Broadhead catfish (Clarias macrocephalus). Out of 50 isolates, 25 isolates were found to be positive on lactose utilisation test and were identified to be gram positive cocci. Using disc diffusion methods, one out of 22 isolates, i.e., a strain A5 demonstrated inhibitions against three indicator organisms; Bacillus cereus, Staphylococcus aureus and Salmonella thyphimurium. Partial 16S rDNA sequencing identified isolate A5 as a member of Lactococcus lactis, with 100% DNA homology...
July 2017: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/28856549/elongation-of-very-long-chain-c24-fatty-acids-in-clarias-gariepinus-cloning-functional-characterization-and-tissue-expression-of-elovl4-elongases
#14
Angela Oboh, Juan C Navarro, Douglas R Tocher, Oscar Monroig
Elongation of very long-chain fatty acid 4 (Elovl4) proteins participate in the biosynthesis of very long-chain (>C24) saturated and polyunsaturated fatty acids (FA). Previous studies have shown that fish possess two different forms of Elovl4, termed Elovl4a and Elovl4b. The present study aimed to characterize both molecularly and functionally two elovl4 cDNA from the African catfish Clarias gariepinus. The results confirmed that C. gariepinus possessed two elovl4-like elongases with high homology to two previously characterized Elovl4 from Danio rerio, and thus they were termed accordingly as Elovl4a and Elovl4b...
August 30, 2017: Lipids
https://www.readbyqxmd.com/read/28844240/developmental-toxicity-and-dna-damaging-properties-of-silver-nanoparticles-in-the-catfish-clarias-gariepinus
#15
Alaa El-Din H Sayed, Hamdy A M Soliman
Although, silver nanoparticles (AgNPs) are used in many different products, little information is known about their toxicity in tropical fish embryos. Therefore, this study evaluated the developmental toxicity of waterborne silver nanoparticles in embryos of Clarias gariepinus. Embryos were treated with (0, 25, 50, 75ng/L silver nanoparticles) in water up to 144h postfertilization stage (PFS). Results revealed various morphological malformations including notochord curvature and edema. The mortality rate, malformations, and DNA fragmentation in embryos exposed to silver nanoparticles increased in a dose- and embryonic stage-dependent manner...
October 2017: Mutation Research
https://www.readbyqxmd.com/read/28804856/toxic-effects-of-copper-on-liver-and-cholinesterase-of-clarias-gariepinus
#16
Siti Nadzirah Padrilah, Siti Aqlima Ahmad, Nur Adeela Yasid, Mohd Khalizan Sabullah, Hassan Mohd Daud, Ariff Khalid, Mohd Yunus Shukor
The release of pollutants, especially heavy metals, into the aquatic environment is known to have detrimental effects on such an environment and on living organisms including humans when those pollutants are allowed to enter the food chain. The aim of this study is to analyse the damage to Clarias gariepinus' liver caused by exposure to different concentrations of copper. In the present study, samples of C. gariepinus were exposed to sub-lethal copper sulphate (CuSO4) concentrations (from 0.2 to 20.0 mg/L) for 96 h...
August 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28783490/chronic-endosulfan-exposure-impairs-immune-response-rendering-clarias-gariepinus-susceptible-to-microbial-infection
#17
Usha Kumari, Rashmi Singh, Shibnath Mazumder
Endosulfan, a persistent organochlorine insecticide affects several off-target organisms including fish though the underlying mechanisms remain obscure. In the present study, we monitored the effect of chronic endosulfan exposure on headkidney (HK), an important immune organ in fish and on fish immune system thereof. Clarias gariepinus were exposed to a non-lethal concentration of endosulfan 2.884ppb (1/10th LC50) for 30 d which resulted in suppressed phagocytosis and bactericidal potential of headkidney macrophages (HKM)...
July 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28768719/the-specialized-pro-resolving-lipid-mediator-maresin-1-protects-hepatocytes-from-lipotoxic-and-hypoxia-induced-endoplasmic-reticulum-stress
#18
Bibiana Rius, Marta Duran-Güell, Roger Flores-Costa, Cristina López-Vicario, Aritz Lopategi, José Alcaraz-Quiles, Mireia Casulleras, Juan José Lozano, Esther Titos, Joan Clària
Endoplasmic reticulum (ER) stress and activation of the unfolded protein response (UPR) are hallmarks of nonalcoholic fatty liver disease (NAFLD), which is the hepatic manifestation of the metabolic syndrome associated with obesity. The specialized pro-resolving lipid mediator maresin 1 (MaR1) preserves tissue homeostasis by exerting cytoprotective actions, dampening inflammation, and expediting its timely resolution. Here, we explored whether MaR1 protects liver cells from lipotoxic and hypoxia-induced ER stress...
August 2, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28767143/uva%C3%B9-induced-dna-damage-and-apoptosis-in-red-blood-cells-of-the-african-catfish-clarias-gariepinus
#19
Alaa El-Din Hamid Sayed
Ultraviolet-A light (UVA) -induced DNA damage and repair in red blood cells to investigate the sensitivity of African catfish to UVA exposure is reported. Fishes were irradiated with various doses of UVA light (15, 30, and 60 min/day for 3 days). Morphological and nuclear abnormalities in red blood cells were observed in the fish exposed to UVA compared with controls. Morphological alterations such as acanthocytes, crenated cells, swollen cells, teardrop-like cells, hemolyzed cells, and sickle cells were observed...
August 2, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28764736/quadriacanthus-species-monogenea-dactylogyridae-from-catfishes-teleostei-siluriformes-in-eastern-africa-new-species-new-records-and-first-insights-into-interspecific-genetic-relationships
#20
Kateřina Francová, Mária Seifertová, Radim Blažek, Milan Gelnar, Zuheir N Mahmoud, Eva Řehulková
BACKGROUND: African catfishes of the families Bagridae and Clariidae are known to be parasitized with monogeneans of Quadriacanthus Paperna, 1961 (Dactylogyridae). The genus remains taxonomically challenging due to its speciose nature and relatively wide host range representing two fish orders, i.e. Siluriformes and Osteoglossiformes, in Africa and Asia. Here, we investigated diversity of Quadriacanthus spp. parasitizing Clarias gariepinus (Burchell), Heterobranchus bidorsalis Geoffroy Saint-Hilaire, and Bagrus docmak (Forsskål) collected in the Lake Turkana (Kenya) and Nile River Basin (Sudan)...
August 1, 2017: Parasites & Vectors
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