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Diseases of Aquatic Organisms

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https://www.readbyqxmd.com/read/28492181/coinfection-by-streptococcus-phocae-and-cetacean-morbillivirus-in-a-short-beaked-common-dolphin-delphinus-delphis
#1
J Díaz-Delgado, E Sierra, A I Vela, M Arbelo, D Zucca, K R Groch, A Fernández
We describe gross, histopathological, and immunohistochemical features of Streptococcus phocae and cetacean morbillivirus coinfection in a short-beaked common dolphin Delphinus delphis. Major gross findings were cutaneous purulent nodules in the tail fluke, vegetative mitral valve endocarditis, and presumed postpartum pyometra. Histologic examination revealed bacterial septicemia characterized by widespread intravascular coccoid bacterial emboli. These were associated with fibrinonecrotizing to pyogranulomatous dermatitis and panniculitis, embolic pneumonia, neutrophilic and lymphoplasmacytic meningochoroiditis, random neutrophilic hepatitis, lymphoplasmacytic myocarditis and epicarditis, necrotizing adrenalitis, suppurative endometritis, and multicentric reactive lymphadenopathy...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492180/batrachochytrium-dendrobatidis-is-present-in-poland-and-associated-with-reduced-fitness-in-wild-populations-of-pelophylax-lessonae
#2
Krzysztof Kolenda, Anna Najbar, Maria Ogielska, Vojtech Balá
The fungus Batrachochytrium dendrobatidis (Bd) is a pathogen associated with global declines of amphibians. We used qPCR to detect Bd in 255 samples from 10 Polish populations of 8 species. We found Bd infection in 3 species (Bombina variegata, Pelophylax lessonae, P. esculentus). The infection intensity in P. lessonae reached a maximum of 58400 genomic equivalents of zoospores (GE), and the 2 most heavily infected individuals died. Previous observations of the populations that included infected individuals showed reduced body size, failure to reproduce, and mortalities of adults...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492179/virulence-variation-among-strains-of-the-emerging-infectious-fungus-batrachochytrium-dendrobatidis-bd-in-multiple-amphibian-host-species
#3
Trang D Dang, Catherine L Searle, Andrew R Blaustein
Emerging infectious diseases have been documented in numerous plant and animal populations. The infectious disease amphibian chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis (Bd), is associated with global amphibian population declines. While much Bd-amphibian research has centered on response variation in hosts, a paucity of information exists on how variation in the pathogen, such as strain differences, affects infection dynamics. To examine how different Bd strains may differentially impact multiple hosts, we conducted laboratory experiments to measure 2 infection outcomes, viz...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492178/isolation-of-bdellovibrio-and-like-organisms-and-potential-to-reduce-acute-hepatopancreatic-necrosis-disease-caused-by-vibrio-parahaemolyticus
#4
Jetnapang Kongrueng, Pimonsri Mitraparp-Arthorn, Khotchawan Bangpanwimon, William Robins, V Vuddhakul, John Mekalanos
Acute hepatopancreatic necrosis disease, a severe disease of shrimp, is caused by Vibrio parahaemolyticus (AHPND Vp), a halophilic bacterium harboring a plasmid that contains toxin genes homologous to Photorhabdus insect-related toxins. We obtained 9 isolates of Bdellovibrio and like organisms (BALOs) from water and sediment samples in Thailand. Using 16S rRNA sequencing, all of the organisms were identified as Bacteriovorax spp. and were able to attack all tested AHPND Vp isolates. In addition, their various susceptible hosts, including Gram-positive and Gram-negative bacteria, were observed...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492177/characterization-of-aliivibrio-fischeri-strains-associated-with-disease-outbreak-in-brill-scophthalmus-rhombus
#5
Jose R López, Laura Lorenzo, Rafael Alcantara, J I Navas
Three bacterial isolates were recovered from a disease outbreak with high mortality affecting brill Scophthalmus rhombus (Linnaeus, 1758). Moribund fish showed no external signs of disease, but plentiful haemorrhages were observed in liver. On the basis of phenotypic and genotypic characterization, the isolates were identified as Aliivibrio fischeri. The phenotypic profile of the isolates was basically similar to that of the type strain of this species, although some discrepancies were observed, mainly in the BIOLOG GN profile...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492176/morphological-re-description-and-phylogenetic-relationship-of-five-myxosporean-species-of-the-family-myxobolidae-infecting-nile-tilapia
#6
Rewaida Abdel-Gaber, Fathy Abdel-Ghaffar, Sherein Maher, Al-Mahy El-Mallah, Saleh Al Quraishy, Heinz Mehlhorn
Freshwater fish have a major economic and nutritional importance worldwide. Myxosporeans are highly dangerous parasites that infect different fish species, causing severe damage to a large number of economically important species, especially in aquaculture. We conducted a survey of myxosporean parasites infecting Nile tilapia Oreochromis niloticus (Perciformes: Cichlidae) collected from different localities along the River Nile passing through Giza province, Egypt. Out of 100 fish specimens collected, 45 were found to be naturally infected with these parasites in the region of the trunk kidney...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492175/risk-factors-associated-with-white-spot-syndrome-virus-outbreaks-in-marine-shrimp-farms-in-rayong-province-thailand
#7
Sompit Yaemkasem, Visanu Boonyawiwat, Jiraporn Kasornchandra, Chaithep Poolkhet
The purpose of this study was to determine risk factors for white spot disease (WSD) in Rayong, Thailand. A study was conducted from October 2014 to March 2015 to identify potential farm-level risk factors using a validated questionnaire. We completed 1 questionnaire for each farm; a total of 38 questionnaires from the case farms and 127 questionnaires from the control farms were collected. The results showed that the presence of WSD in previous crops and the use of seawater were risk factors (p < 0.01), indicating that the environment plays an important role in WSD outbreaks in Rayong...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492174/hematodinium-spp-infections-in-wild-and-cultured-populations-of-marine-crustaceans-along-the-coast-of-china
#8
Jin-Feng Wang, Meng Li, Jie Xiao, Wen-Jun Xu, Cai-Wen Li
The parasitic dinoflagellate Hematodinium spp. infects a broad range of marine crustaceans. Its epidemics have impacted wild populations of various commercial fishery species around the world and the sustainability of mariculture in China. To study the epidemiology of Hematodinium spp. in marine crustaceans along the coast of China, we conducted a broad survey of wild and cultured stocks of major crustacean species in 2013 to 2015. Hematodinium sp. infections were identified in wild stocks of Portunus trituberculatus from Huludao, Laizhou, Qingdao, Yangtze River Estuary and Zhoushan, and Scylla paramamosain from Shantou; and cultured stocks of Portunus trituberculatus and Penaeus monodon from a polyculture pond in Qingdao...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28492173/disease-ecology-of-hematodinium-perezi-in-a-high-salinity-estuary-investigating-seasonal-trends-in-environmental-detection
#9
K A Lycett, J S Pitula
The blue crab Callinectes sapidus has seen a general decline in population levels. One factor influencing mortality is infections by Hematodinium perezi, a dinoflagellate parasite. A 2 yr study was conducted in 2014 and 2015 to monitor H. perezi DNA within the Maryland (USA) coastal bays, comparing seasonal cycles in the abundance of parasite DNA in environmental samples to parasite presence in host blue crabs. A late summer to early fall peak in H. perezi infections in blue crabs was observed, consistent with previous work...
May 11, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425429/evidence-of-horizontal-transmission-of-the-cancer-associated-steamer-retrotransposon-among-ecological-cohort-bivalve-species
#10
Ashley N Paynter, Michael J Metzger, Jocelyn A Sessa, Mark E Siddall
Bivalve specimens from legacy frozen tissue collections, and others freshly obtained, were surveyed for the presence of the Steamer long terminal repeat (LTR)-retrotransposon associated with disseminated hemic neoplasia of the soft-shelled clam Mya areneria. Of 22 species investigated using primers for the pol region, only Atlantic M. arenaria, Atlantic and North Sea razor clams Ensis directus, and Baltic clams Macoma balthica from the North Sea were found to possess copies of Steamer in their genomes. Notably, close relatives like Mya truncata and Siliqua patula did not exhibit evidence of Steamer...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425428/innate-immune-response-of-channel-catfish-ictalurus-punctatus-mannose-binding-lectin-to-channel-catfish-virus-ccv
#11
Donald D Ourth, Emily Marecaux, Deepthi Raghu, Brian C Peterson
The channel catfish virus (CCV) is a pathogenic herpesvirus that infects channel catfish Ictalurus punctatus in pond aquaculture in the southeastern USA. Mannose-binding lectin (MBL), an innate immune protein, could play an important role in the innate response of channel catfish by binding to CCV. Cell cultures of CCV were grown in channel catfish ovary cells (CCOC). A dot-immunoblot enzyme-linked immunosorbent assay was done to determine the binding ability of 5 mo old channel catfish serum MBL (26.2 µg ml-1) to CCOC infected with CCV...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425427/tetracapsuloides-bryosalmonae-abundance-in-river-water
#12
Inês Fontes, Hanna Hartikainen, Jason W Holland, Chris J Secombes, Beth Okamura
Tetracapsuloides bryosalmonae is a myxozoan parasite of freshwater bryozoans and salmonids, causing proliferative kidney disease in the latter. To date, detection of the parasite has required collection of hosts and subsequent molecular or histological examination. The release of infectious spores from both hosts offers an opportunity to detect the parasite in water samples. We developed a novel SYBR® Green quantitative real-time PCR (qPCR) assay for T. bryosalmonae in water samples which provides an estimation of bryozoan malacospore numbers and tested the assay in 3 rivers in southern England (UK) over a period of 5 wk...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425426/production-of-red-tilapia-oreochromis-spp-in-floating-cages-in-the-mekong-delta-vietnam-mortality-and-health-management
#13
Annette S Boerlage, Tu Thanh Dung, Tran Thi Hoa, Jeffrey Davidson, Henrik Stryhn, K Larry Hammell
The Mekong Delta in Vietnam is one of the most productive aquaculture regions in the world, in which the red tilapia (Oreochromis spp.) industry is a small-scale industry that mainly supplies local markets in the delta region. Little is known about the frequency of mortality events and health management in this sector. We describe red tilapia floating cage production systems in the Mekong Delta, Vietnam, for the purposes of quantifying mortality and associated production factors, and describing practices that may influence pathogen introduction and spread to and from farms...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425425/skeletal-anomalies-in-reared-senegalese-sole-solea-senegalensis-juveniles-a-radiographic-approach
#14
A M de Azevedo, A P Losada, A Barreiro, J D Barreiro, I Ferreiro, A Riaza, S Vázquez, M I Quiroga
Reared Senegalese sole Solea senegalensis Kaup show a high incidence of vertebral anomalies; however, little is known about its skeletal anomaly profile in the later farming phases. The purpose of this study was to provide a detailed description and quantification of the most common skeletal anomalies in reared Senegalese sole in the juvenile stage by means of computed radiography. A total of 374 Senegalese sole were classified according to the external morphology of the fish as normal or altered and then radiographed in latero-lateral and in dorso-ventral projections...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425424/spatial-distribution-of-batrachochytrium-dendrobatidis-in-south-american-caecilians
#15
Carolina Lambertini, C Guilherme Becker, Cecilia Bardier, Domingos da Silva Leite, Luís Felipe Toledo
The amphibian-killing fungus Batrachochytrium dendrobatidis (Bd) is linked to population declines in anurans and salamanders globally. To date, however, few studies have attempted to screen Bd in live caecilians; Bd-positive caecilians have only been reported in Africa and French Guiana. Here, we performed a retrospective survey of museum preserved specimens to (1) describe spatial patterns of Bd infection in Gymnophiona across South America and (2) test whether areas of low climatic suitability for Bd in anurans predict Bd spatial epidemiology in caecilians...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425423/pathology-and-molecular-analysis-of-hapalotrema-mistroides-digenea-spirorchiidae-infecting-a-mediterranean-loggerhead-turtle-caretta-caretta
#16
M Santoro, F Di Nocera, D Iaccarino, S P Lawton, A Cerrone, B Degli Uberti, M D'Amore, A Affuso, S Hochscheid, F Maffucci, G Galiero
Turtle blood flukes belonging to the family Spirorchiidae (Digenea) represent a major threat for sea turtle health and are considered the most important parasitic cause of turtle stranding and mortality worldwide. Despite the large diversity of spirorchiid species found globally, there are only 2 records for free-ranging Mediterranean sea turtles that date back to the late 1800s involving just Hapalotrema mistroides Monticelli, 1896. This study describes the first fatal confirmed case of spirorchiidiasis in a free-ranging Mediterranean loggerhead turtle Caretta caretta (Linnaeus) and, owing to the complexities of taxonomic identification of these parasites, provides the first molecular characterization and phylogenetic analysis of H...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28425422/mass-mortality-of-eastern-box-turtles-with-upper-respiratory-disease-following-atypical-cold-weather
#17
Mickey Agha, Steven J Price, A Justin Nowakowski, Ben Augustine, Brian D Todd
Emerging infectious diseases cause population declines in many ectotherms, with outbreaks frequently punctuated by periods of mass mortality. It remains unclear, however, whether thermoregulation by ectotherms and variation in environmental temperature is associated with mortality risk and disease progression, especially in wild populations. Here, we examined environmental and body temperatures of free-ranging eastern box turtles Terrapene carolina during a mass die-off coincident with upper respiratory disease...
April 20, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28357988/isolation-of-lacinutrix-venerupis-strains-associated-with-disease-outbreaks-in-sea-bream-sparus-aurata-and-european-sea-bass-dicentrarchus-labrax
#18
Jose R López, Rafael Alcantara, Laura Lorenzo, J I Navas
Four Gram-negative bacterial isolates were recovered from 2 disease outbreaks that occurred in 2013 affecting European sea bass Dicentrarchus labrax fry and sea bream Sparus aurata adults. Main symptoms were erratic swimming, eroded fins and, in the sea bream outbreak, haemorrhages on the body surface; bacteria were always recovered from internal organs, almost in pure culture. On the basis of phenotypic characterization and 16S rRNA gene sequence analysis, the isolates were identified as Lacinutrix venerupis, a bacterium not previously reported as a fish pathogen...
March 30, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28357987/health-status-of-corals-surrounding-kish-island-persian-gulf
#19
Mahsa Alidoost Salimi, Pargol Ghavam Mostafavi, Seyyed Mohammad Fatemi, Greta S Aeby
Corals in the Persian Gulf exist in a harsh environment with extreme temperature and salinity fluctuations. Understanding the health of these hardy corals may prove useful for predicting the survival of other marine organisms facing the impacts of global climate change. In this study, the health state of corals was surveyed along belt transects at 4 sites on the east side of Kish Island, Iran. Corals had a patchy distribution, low colony densities and species diversity, and were dominated by Acropora, Porites, and Dipsastrea...
March 30, 2017: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/28357986/seasonal-variation-in-chaetognath-and-parasite-species-assemblages-along-the-northeastern-coast-of-the-yucatan-peninsula
#20
Horacio Lozano-Cobo, María Del Carmen Gómez Del Prado-Rosas, Laura Sánchez-Velasco, Jaime Gómez-Gutiérrez
Chaetognaths are abundant carnivores with broad distributions that are intermediate hosts of trophically transmitted parasites. Monthly variations in chaetognath and parasite species distributions, abundance, prevalence, and intensity related to seasonal environmental changes were recorded in 2004 and 2005 in Laguna Nichupté, a coral reef, and the adjoining continental shelf of Quintana Roo, Mexico. Of 12 chaetognath species plus Sagitta spp., only 5 (Ferosagitta hispida, Flaccisagitta enflata, Sagitta spp...
March 30, 2017: Diseases of Aquatic Organisms
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