Academic literature on the topic 'Freshwater fish diseases'
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Journal articles on the topic "Freshwater fish diseases"
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Haenen, O. L. M. "Diseases of freshwater fish." Veterinary Quarterly 18, sup3 (1996): 132–33. http://dx.doi.org/10.1080/01652176.1996.9694714.
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Patel, Ajay. "Fungal Diseases of Fish: A Review." Open Access Journal of Veterinary Science & Research 3, no. 3 (2018): 1–5. http://dx.doi.org/10.23880/oajvsr-16000164.
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Now a day, fishes are used for biomedical researches along with use as a food also. Chemical contaminants of marine environments are of momentous concern. Similar to other flora and fauna, fish can also be ill with various types of diseases. Freshwater fishes are an important protein source for people of many countries. Fish farming in various parts of the world has increased many folds in the last decade. Bacterial hemorrhagic septicemia, lernaeasis, saprolegniasis and anoxia are the most frequently occurring fish diseases in pond fishes. Fungal infections are among the most general diseases seen in temperate fish. Water moulds infections cause losses of freshwater fishes and their eggs in both natural and commercial fish farms. Although, infection as a result of microbial contamination does not frequently result in disease but ecological stress may upset the balance between the probable pathogens and their hosts. Prevention is, as always, the best medicine. Most infe ctions can be successfully treated if caught early.
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Walczak, Natalia, Krzysztof Puk, and Leszek Guz. "Bacterial flora associated with diseased freshwater ornamental fish." Journal of Veterinary Research 61, no. 4 (2017): 445–49. http://dx.doi.org/10.1515/jvetres-2017-0070.
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AbstractIntroduction:Ornamental fish can suffer from different bacterial diseases. Among them the most prevalent are infections caused byAeromonas, Shewanella, Citrobacter, Plesiomonas, Edwardsiella, andPseudomonas.But there is a broad spectrum of rarely identified bacteria which may be causative agents of diseases. The aim of the study was to determine the species of bacteria pathogenic for fish which are prevalent in aquariums.Material and Methods:Bacteria were isolated from infected ornamental fish from pet shops and private aquariums in the Lublin region in 2015 and classified to species using MALDI-TOF MS.Results:A total of 182 isolates from ornamental fish were identified. The most frequent bacteria found in diseased fish wereAeromonas veronii(30.8% of total number of strains),A. hydrophila(18.7%),Shewanella putrefaciens(7.1%),Citrobacter freundii(7.1%),Pseudomonas spp. (7.1%),Shewanella baltica(4.9%), andPlesiomonas shigelloides(3.3%).Conclusion:Isolated bacterial species are facultative pathogens for fish and humans and may be isolated from fish without apparent symptoms of the disease.
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Padrós, Francesc, and Maria Constenla. "Diseases Caused by Amoebae in Fish: An Overview." Animals 11, no. 4 (2021): 991. http://dx.doi.org/10.3390/ani11040991.
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Parasitic and amphizoic amoebae are ubiquitous and can affect a huge variety of hosts, from invertebrates to humans, and fish are not an exception. Most of the relationships between amoebae and fish are based on four different types: ectocommensals, ectoparasites, endocommensals and endoparasites, although the lines between them are not always clear. As ectocommensals, they are located specially on the gills and particularly the amphizoic Neoparamoeba perurans is the most relevant species, being a real pathogenic parasite in farmed salmon. It causes amoebic gill disease, which causes a progressive hyperplasia of epithelial cells in the gill filaments and lamellae. Nodular gill disease is its analogue in freshwater fish but the causative agent is still not clear, although several amoebae have been identified associated to the lesions. Other species have been described in different fish species, affecting not only gills but also other organs, even internal ones. In some cases, species of the genera Naegleria or Acanthamoeba, which also contain pathogenic species affecting humans, are usually described affecting freshwater fish species. As endocommensals, Entamoebae species have been described in the digestive tract of freshwater and marine fish species, but Endolimax nana can reach other organs and cause systemic infections in farmed Solea senegalensis. Other systemic infections caused by amoebae are usually described in wild fish, although in most cases these are isolated cases without clinical signs or significance.
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Hossain, MK, KT Islam, MD Hossain, and MH Rahman. "Environmental Impact Assessment of Fish Diseases on Fish Production." Journal of Science Foundation 9, no. 1-2 (2013): 125–31. http://dx.doi.org/10.3329/jsf.v9i1-2.14655.
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The present research work was conducted from July 2008 to June 2009 to investigate intensity of infestation of parasites in freshwater fishes and the impact of fish diseases on fish production in northern region of Bangladesh. Possibility of out break of diseases due to deterioration of environmental factors of water bodies was included in this study. The diseases identified were ulcer diseases, EUS (Epizootic Ulcerative Syndrome), Ichthyophthiriasis, Trichodiniasis, Chilodoneliasis, Myxoboliasis, Dactylogyrosis, Gyrodactylosis, Argulosis, Pernicious anaemia, Red spot disease, Red Pest of freshwater eel, Mouth fungus, Branchiomysis, Abdominal dropsy and whirling disease. The infestation more occurred in young fishes than in adult fishes. The overall water qualities of water bodies fluctuated from July 2008 to June 2009. Physicochemical parameters have more or less significant combined effect on the deterioration of water quality as well as fish diseases. Gills were the most affected sites and parasites damaged gill filaments by rupturing blood capillaries, causing necrosis, coagulation and hemorrhage. The present study revealed the prevalence of different organisms in fishes, which are potential pathogen for them. Fishes were infested by parasites and other pathogens. From overall study it was observed that the parasites, bacteria and fungus were most important pathogen for outbreak of diseases. It was also observed that there was a direct relation between disease outbreak among fishes and environmental factors. Low alkalinity reduces the buffer capacity of water and badly affects the pond ecosystem, which in turn cause stress to the fish and become more susceptible to diseases. In case of low aquatic environmental temperature fish reduces metabolic activities, which in turn makes the fish more susceptible during the winter period towards parasitic infection. DOI: http://dx.doi.org/10.3329/jsf.v9i1-2.14655 J. Sci. Foundation, 9(1&2): 125-131, June-December 2011
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Kanchan, Chutharat, Puttachat Imjai, Nukoon Kanchan, Aonanong Chaiyara, and Kwanprasert Panchai. "Occurrence of parasitic and bacterial diseases in Thai freshwater fish." Journal of Agricultural and Crop Research 8, no. 10 (2020): 210–14. http://dx.doi.org/10.33495/jacr_v8i10.20.168.
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The present study was aimed to investigate the occurrence of parasitic and bacterial diseases in some freshwater fish in NongBo reservoir, Maha Sarakham Province. The sampling was randomly collect from three sites by gillnets, bag nets and cast nets from the local fisherman during October 2015 to September 2016. A total of eight freshwater fish species were identified namely Oreochromis niloticus, Hampala dispar, Pristolepis fasciata, Trichopodus pectoralis, Anabas testudineus, Oxyeleotris marmorata, Channa striata and Clarias batrachus. The parasitic diseases found on the sampled fish specied were external parasites such as Trichodina sp., Dactylogyrus sp. and Digenea gen.sp. The bacterial diseases identified were Aeromonas hydrophila, Acinetobacter baumannii, Plesiomonas shigelloides, Serratia odorifera and Staphylococcus epidermis. The dominant species of bacterium was Aeromonas hydrophila. This study revealed that the natural fish stock could be risk from the fish pathogens both parasites and bacteria. Keywords: Reservoir, external parasite, fish pathogens.
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Bucke, D., Leonid Popov, and Lars E. Holmer. "Monitoring for Diseases in Marine and Freshwater Fish, 1991." Journal of Animal Ecology 64, no. 2 (1995): 302. http://dx.doi.org/10.2307/5773.
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Rahman, Md Shahinur, Subrata Mondal, and Amir Hossain. "Agrochemicals used in freshwater aquaculture in Jhenaidah district, Bangladesh." Asian-Australasian Journal of Food Safety and Security 3, no. 2 (2019): 63–76. http://dx.doi.org/10.3329/aajfss.v3i2.55931.
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The present experiment was conducted in order to investigate the use of agrochemicals in freshwater aquaculture with emphasis on fish health management. The selected area was Mahespur upazila under Jhenaidah district and the study duration was six months. The main group was fifty fish farmers and the data were collected through interview with fish farmers and key informants (chemical seller). Ten categories of chemicals were identified that are used by fish farmers for various purposes such as pond preparation, water quality management, controlling diseases, supplying oxygen, killing fish predators, Ten pharmaceutical companies were found to provide the agrochemicals to fulfill the farmers need. These companies are Novartis Anmal Health Ltd, Fishtech (BD) Ltd, SK+F BD Ltd, Renata Ltd, ACI Animal Health, Opsonin Pharma Ltd, Eon Animal Health Products Ltd, Square Pharmaceuticals Ltd, Sciencetech Agro Industries Ltd, Rals. In the study area some kinds of diseases were founded such as Epizotic Ulcerative Syndrome (EUS) in Rohu (Labeo rohita), Catla (Catla catla), Mozambique tilapia (Oreochromis niloticus), Black spot in Stinging cat fish, skin diseases, gill damage, tail and fin rot in Yellow tail catfish (Pangasius pangasius). For highest stocking density tilapia and pangus were mostly affected by diseases in winter. Farmers use various chemicals such as for water quality management agriculture lime, Geotox, JV Zeolite, Mega Zeo Bio, Aquakleen and Biomin, as antibiotic they use Novamix 101, Erocot, Captor, Oxysentin 20%, Renamycin, Aquamycin and Oxysentin 20% are antibiotics with different trade names were seen in the market as well as used by the fish farmers in the study area. The fish farmers use a wide variety of disinfectants in freshwater aquaculture. Timsen, Polgard plus, Formalin, Bleaching powder, EDTA are found available in all the shops of Mahespur. Formalin is used to control protozoan diseases. Virex is used to destroy virus and bacteria. Fish farmers use oxygen suppliers to increase the oxygen level in the water body. Oxidizing agent, hydrogen peroxide are major active ingredients of such chemical. The recovery of fish diseases was found 80-90% in the study area. During field observation many problems were identified in case of using agrochemicals which included lack of skill and knowledge of farmers about the application, withdrawal period of agrochemicals and drugs and some adverse effects on fish and human health.
 Asian Australas. J. Food Saf. Secur. 2019, 3(2), 63-76
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Molnár, Kálmán. "Solving parasite-related problems in cultured freshwater fish." International Journal for Parasitology 17, no. 2 (1987): 319–26. http://dx.doi.org/10.1016/0020-7519(87)90106-8.
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Cardoso, Pedro Henrique Magalhães, Andrea Micke Moreno, Luisa Zanolli Moreno, et al. "Infectious diseases in aquarium ornamental pet fish." Brazilian Journal of Veterinary Research and Animal Science 56, no. 2 (2019): e151697. http://dx.doi.org/10.11606/issn.1678-4456.bjvras.2019.151697.
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Aquarium ornamental pet fish constitute a major segment in the pet industry, with the United States, Europe, and Japan dominating the market. There are approximately 1,500 marine fish species and over 4,500 freshwater fish species commercialized as aquarium ornamental pet fish. Fish are the fourth most common pet present in Brazilian homes. In Brazil, aquarium ornamental pet fish can be marketed and distributed from different parts of the Brazilian territory and the world. Commercialization and circulation of living animals without the use of adequate prophylactic management procedures enables dissemination of a number of agents responsible for infectious diseases. Aquarium pet fish can also carry pathogenic agents, of bacterial, viral, fungal, or parasitic etiology, that may have a zoonotic feature endangering the persons handling the animals. This review presents the main pathogenic infectious agents of bacterial, viral, andfungal etiology that affect aquarium pet fish, as well as the prevention and control measures to ensure sanitary excellence in this segment.
Dissertations / Theses on the topic "Freshwater fish diseases"
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Feist, Stephen Wolfgang. "Inter-relationships of myxosporeans, including PKX with certain freshwater fish." Thesis, University of Plymouth, 1993. http://hdl.handle.net/10026.1/2755.
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The prevalence and impact of proliferative kidney disease (PKD) and myxosporidiosis has been investigated in wild fish stocks in the UK, over 1,500 fish representing 17 species being examined. PKD was recorded in brown trout, grayling and pike, the causative agent, the PKX cell, being identified with the aid of light and electron microscopy. A further 27 myxosporean species were also noted, with Myxobolus cotti (syn. M. jiroveci), in the brain of bullheads Cottus gobio being recorded for the first time. Studies on the structure and development of Myxidium lieberkuehni in pike revealed several previously undescribed features. Comparative morphological studies were undertaken to assess affinities of PKX with known myxosporean species. Results indicated similarities with early presporogonic stages of several myxosporean species, especially those belonging to the genus Sphaerospora. The apparent rarity of spore formation associated with PKX infections in the hosts examined focussed attention on species of Sphaerospora as possible sources of infection to salmonids. Studies concentrated on the possible involvement of the 3-spined stickleback, Gasterosteus aculeatus and its renal parasite, Sphaerospora elegans, in PKD transmission. A re-description of this parasite (recently elevated to "type species" for the genus), was prepared. Laboratory experiments using rainbow trout PKX cells successfully transmitted the infection to rainbow trout, brown trout, brook trout and grayling; however sticklebacks challenged with PKX cells did not appear to become infected. Rainbow trout challenged with S. elegans spores and presporogonic stages showed no evidence of sphaerosporosis or PKD. Experiments designed to investigate the possible role of tubificid worms in PKD transmission provided inconclusive results. Field studies provided data on the pathogenesis of PKD in grayling and showed this species to be highly susceptible to the disease.
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Hartikainen, Hanna-Leena. "Freshwater bryozoan abundence, eutrophication and salmonid fish disease." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493801.
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This research investigates the links between nutrient enrichment, bryozoan abundance and the development of myxozoan parasites in bryozoans. It was found that bryozoan abundances are elevated in nutrient-rich rivers, demonstrating the potential bio-indicator value of bryozoans and predicting increased bryozoan abundances with increased planktonic productivity when space is not limiting. A comprehensive set of laboratory microcosm studies showed also that experimental nutrient enrichment increased growth rates and statoblast production in Fredericella sultana, corroborating the results from field surveys.
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Hurst, Timothy Parker. "Evaluation of Australian native fish and lavicides for the integrated control of freshwater mosquito vectors /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18164.pdf.
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McLeish, Jenny. "Non-native bullhead in Scotland : molecular and morphological identification and parasite links with native fauna." Thesis, Edinburgh Napier University, 2018. http://researchrepository.napier.ac.uk/Output/1253308.
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The arrival of a non-native species to has the potential to shape native communities by influencing ecological interactions such as predation, foraging, competition and disease transfer. A designation of invasive is applied to an introduced non-native species that has the potential to threaten the continued wellbeing of a native species, pose a risk to human health or negatively impact the economy. The European bullhead (Cottus perifretum) is a freshwater benthic-dwelling fish that is native to England but considered invasive in Scotland. The species was first reported in Scotland in the 1950's and thriving populations are now established in the waters of the Clyde, Forth and Tweed catchments. Bullhead presence is thought to negatively impact native stone loach (Barbatula barbatula) and brown trout (Salmo trutta) parr, due to shared preferences for habitat and prey resources. They are also thought to prey upon the eggs of native Atlantic salmon (Salmo salar) and brown trout, two species that are of high commercial value in Scotland. In other areas of introduction, bullheads have been found to increase parasite infection rates in native fishes. The species therefore has the capacity to incite competition and alter parasite/host interactions in areas of introduction, to the potential detriment of native fauna and the Scottish economy. The European bullhead has been the subject of considerable taxonomic scrutiny in recent years, resulting in its reclassification as a species complex. What was once considered a single species with a distribution encompassing Europe, Russia, Asia and Scandinavia, has been shown to consist of at least 15 distinct species. Genetic examination of bullheads from England confirmed the presence of Cottus perifretum, not Cottus gobio as traditionally listed in all UK literature and legislation. Native English bullhead is currently protected under Annex II of the European Commission Habitats Directive 92/43/EEC, based on the historic assumption that the species present is C. gobio. Analysis of the taxonomic identity of Scottish bullheads has remained outstanding. In this study the invasive status of bullhead was explored by examining feeding and parasitological interactions between bullheads and native freshwater communities in south-east Scotland. An assessment of the feeding preferences of native brown trout and stone loach in the presence and absence of bullheads tested competition for prey resources. Parasitological interactions were investigated by examining the shared parasite fauna of bullheads and native fish and invertebrate species. Bullheads from the Clyde and Forth catchments were analysed to provide a molecular and morphological description of this introduced species. Phylogenetic analysis of COX1 sequences obtained from Scottish bullheads, and a pair-wise distance calculation based on a Kimura 2-parameter model, showed that samples clustered in a distinct clade with English C. perifretum. Significant intraspecific variation was reported in all morphological features examined, but pooled data also revealed a resemblance to the published description provided for C. perifretum. Scottish bullhead is therefore confirmed to be an introduced pocket of the native English species, which is considered under threat in some areas due to habitat modifications and population decline. Comparisons between the dietary compositions of bullheads, brown trout and stone loach showed that the prey selection of brown trout and stone loach varied in the sample locations that contained co-occuring bullheads, when compared to locations where bullheads were absent. However, no direct evidence of trophic competition between bullheads and either brown trout or stone loach was reported. An examination of parasitological interactions recovered eight parasite species from four distinct taxonomic groups in total, of which four species (Echinorhynchus truttae, Apatemon gracilis, Diplostomum volvens and Raphidascaris acus) were shared between bullheads and one or more native fishes. Echinorhynchus truttae was also shared with gammarid crustaceans. Bullhead presence was found to coincide with D. volvens infections in European minnow (Phoxinus phoxinus) and a reduced prevalence of E. truttae in brown trout. Diplostomum volvens was only reported from minnow found in sites with bullheads, strongly suggesting bullheads were responsible for introducing this parasite to native minnows. Bullheads functioned as an alternative host for E. truttae, diluting brown trout parasite loads and reducing overall infection rates in sites where bullhead and brown trout co-exist. The findings reported for both feeding preference and parasite burdens in the presence and absence of bullheads suggest that bullheads do have some effect on the ecology of native species, but these are considered minimal and unlikely to impact the long-term survival of native species. Eradication of Scottish bullhead may contradict the conservation effort that is currently in place. Given the current lack of evidence to validate bullhead's invasive qualities and the recent confirmation of its genetic lineage, revisiting the designation of the bullhead as invasive is warranted. Active eradication should be treated with caution until a significant negative impact can be proven.
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Sedlaczek, Jürgen. "Untersuchungen zum Auftreten von Myxosporidien bei Nutz- und Wildfischarten aus Binnengewässern der DDR." Doctoral thesis, Humboldt-Universität zu Berlin, Landwirtschaftlich-Gärtnerische Fakultät, 2016. http://dx.doi.org/10.18452/17430.
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Die Arbeit verfolgt das Ziel, eine Übersicht über die bei verschiedenen Süßwasserfischarten festgestellten Myxosporidien zu geben. Aus Gewässern der DDR-Bezirke Potsdam, Berlin, Frankfurt (Oder), Cottbus und Dresden wurden 1.850 Fische (1.015 Karpfen, 258 Regenbogenforellen, 143 Silberkarpfen, 104 Plötzen sowie weitere 22 Fischarten in geringer Zahl untersucht. Es wurden 40 Myxosporidienarten folgender taxonomischer Gruppen nachgewiesen: Myxidiidae (7), Sphaerosporidae (6), Chloromyxidae (4) und Myxobolidae (23). In der Arbeit sind Maße, Fotos und Zeichnungen der Parasiten enthalten. Es wurden Angaben über die Taxonomie, Organspezifität, Saisondynamik, Epizootiologie und Auswirkungen auf die Fischgesundheit gemacht. Es erfolgte ein Vergleich mit früheren Arbeiten in der DDR auf diesem Gebiet. Der Artenbestand an Myxosporidien konnte um 39 Arten erweitert werden. Anhand faunistischer Arbeiten aus benachbarten Ländern wurden die Bedeutung und Perspektiven zum Auftreten von Myxosporidiosen in der DDR herausgestellt.<br>This work aims to give an overview about the detected Myxosporeans in different species of freshwater fishes. From inland waters of the GDR districts Potsdam, Berlin, Frankfurt (Oder), Cottbus and Dresden 1.850 fishes (1.015 carps, 258 rainbow trouts, 143 silver carps, 104 roach and more 22 Fish species in small numbers were studied. 40 Myxosporean species of following taxonomic groups were detected: Myxidiidae (7), Sphaerosporidae (6), Chloromyxidae (4) und Myxobolidae (23). In this work are presented dimensions, photos and drawings of the parasites. Details are given on taxonomy, organ specificity, season dynamics, epizootiology and the impact on fish health A comparison with previous work in the GDR on this subject was carried out. The species inventory on Myxosporidia could be extended to 39 species. Based on faunal work from neighboring countries the importance and prospects for occurrence of Myxosporidiosis in the GDR were highlighted.
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Groenewald, Marinka. "Bioaccumulation of metals and the general health of fish from the Vaal Dam and Vaal River Barrage." Thesis, 2012. http://hdl.handle.net/10210/4320.
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M.Sc.<br>The water quality in the Vaal River system has deteriorated due to increasing industrial, mining and agricultural activities in the Vaal Dam and Vaal River Barrage catchment areas. This study was undertaken to determine the water quality in the Vaal Dam, and three localities within the Vaal River Barrage reservoir (i.e. the Riviera Aquatic Club, Abrahamsrust Pleasure Resort and at the Barrage structure). The objectives of this study, was to determine the fish population species composition, evaluate the general health of the selected fish species and obtain site specific metal bioaccumulation data for each locality. Suggestions and proposals for future monitoring and management of these waterbodies were also made. Metereological information on the Vaal River Barrage area was supplied by Rand Water, as well as physical and chemical data of fixed localities, sampled fortnightly (January 1997 to September 1998). In addition, water samples were collected at the Vaal Dam and the three Vaal River Barrage localities mentioned above, during February, May, August and November 1997. These samples were analysed by the Chemistry Department of the Rand Afrikaans University in accordance with standard methods. The chemical and physical characteristics and metal concentrations (aluminium, cadmium, calcium, copper, iron, magnesium, manganese, nickel, strontium and zinc) of these separate sets of data were then compared with Rand Water's Raw Water Quality Criteria. The aluminium, ammonia, chromium, copper, dissolved organic carbon, fluoride, iron, lead, manganese, nitrate, sulphate, total hardness and turbidity variables did not comply with the recommended guideline values. No guideline levels for strontium are available, however. Sedimentation, turbidity, salination and eutrophication within the Vaal River system play an important role in the bioaccumulation of metals by benthic organisms. Metals that adsorb to sediment particles, through various processes, are generally more persistent and less mobile than those in the overlying water and pose a severe long-lasting threat to the aquatic environment. Generally, the highest metal concentrations (AI, Cd, Cu, Fe, Mn, Ni, Pb, Sr and Zn) in the sediment samples collected at the four localities and seasons, were found in the finer sediment classes (class D). The Riviera Aquatic Club locality had the highest overall concentrations of the metals analysed. The adult fish communities within the Vaal Dam and Vaal River Barrage were assessed, as it is believed that the fish community structure is indicative of environmental conditions. Adult Labeo capensis, Labeo umbratus, Cyprinus carpio, Clarias gariepinus, Barbus aeneus and Micropterus sa/moides, were collected (using gill nets) to determine the adult fish community composition and age. When compared with a study conducted by Mulder (1971), it is clear that Labeo capensis has remained the most abundant species within the system, but that Barbus aeneus has now been replaced by Labeo umbratus as the second most abundant species. Furthermore, age determination tables (Mulder, 1971) were used to classify the fish population between the ages of 2 and 7 years. This indicates a healthy, dynamic community structure where recruitment is taking place. The Health Assessment Index (HAl) was used to determine the general health of the two fish species selected for metal analysis (i.e. Labeo capensis and Labeo umbratus). Except for moderate to severe gill damage recorded, no damage to external variables, were of concern. However, both Labeo capensis and Labeo umbratus had high percentages (89% and 93%, respecii tively) of abnormal livers. Using the Plascon Colour Chart (Watson, personal communication), these livers were classified as ranging from tan to "coffee with cream" in colour. High haematocrit and plasma protein levels were observed and could be due to environmental stress, while the White Blood Cell Counts were within normal ranges. Generally speaking, only mild to moderate parasite infections were observed and probably do not pose a serious health threat to the fish host. Total HAl values for Labeo capensis indicate that this this fish population was in relatively good health, but too few Labeo umbratus individuals were collected to make accurate assumptions about this population. Metal analysis (AI, Cd, Cu, Fe, Mn, Ni, Pb, Sr and Zn) was carried out on the tissues and organs (skin, muscle, gill filaments, gill arches, liver, hindgut content, gonads and vertebrae) of Labeo capensis and Labeo umbratus, collected during the study period. Only aluminium, iron and strontium are discussed. Aluminium concentrations were relatively high at all of the localities, but as pH values were mostly alkaline, aluminium is rendered biologically unavailable and as for iron, was mostly accumulated in the non-edible portion and viscera of the fish. Strontium accumulates in bony tissues due to its similarity with calcium, but is not essential for bone formation. The human health risks of these metals in the edible portion of the fish still have to be refined and communicated to the general public of South Africa. In conclusion, this baseline study has determined the metal concentrations in the aquatic environment (due to anthropogenic activities) that may be accumulated by fish and may affect the adult fish community structures and their general health.
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"'n Ondersoek na aspekte van die ekologie, teelt en produksie van Clarias gariepinus (Burchell) 1822." Thesis, 2014. http://hdl.handle.net/10210/8920.
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Kanga, Jean Serge. "A comparative health assessment of three fish species from a selected site in the Vaal River, South Africa." Thesis, 2013. http://hdl.handle.net/10210/8528.
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M.Sc. (Zoology)<br>The Vaal River system is constantly subjected to pollution from various industrial, mining and agricultural activities. Consequently, pressure is continually exerted on the health of its fish communities and it was suspected that this may be a contributing factor to the repeated fish kills that have occurred in various sections of the river over the past few years. The aim of this study was to assess the health status of three fish species that were affected by the most recent mass fish mortality in the Vaal River. This was done using a combination of techniques including a histology-based health assessment (HHA) that involved a standard fish necropsy, the evaluation of blood parameters as well as a microscopic assessment of the liver, kidney, gills, and gonads. The histological results were semi-quantitatively assessed. Selected chemical substances were also tested for in water, sediment and the skeletal muscle tissue of the fish. Clarias gariepinus, Labeo capensis and Labeo umbratus specimens were collected from the Vaal River, approximately 2480m below the Vaal Dam (Latitude 26°51'17.47"S; Longitude 28° 7'16.58"E) following the latest occurrence of a fish kill in November 2011. Fish were collected using gill nets. Water was sampled in triplicate at three locations, and in situ measurements were done for selected physico-chemical parameters. Sediment samples were also collected and subjected to a sequential extraction technique and quantification of the heavy metals was done using Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS). Metals in skeletal muscle tissue and water were quantified using the same technique. An analysis of variance (ANOVA), followed by the appropriate post-hoc test was performed to determine differences between means of variables i.e. morphometric, histological, substance concentration and blood parameters...
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Kuo, Ming-chin, and 郭明欽. "Pathological and Molecular Studies on Columnaris Disease in Freshwater Fish." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/13252118401956147875.
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碩士<br>國立屏東科技大學<br>獸醫學系所<br>101<br>Fish columnar disease for the province of summer when high water temperature, a common fish diseases, mainly by the Flavobacterium columnare caused columnaris, often occurs in the perch, eel, tilapia and other freshwater fish farming, and caused a large number of fish deaths, some other brackish or seawater fish farmed fish also infection. Columnaris pathogen mainly affects the surface of the gill tissue and epithelial tissue, causing rot gill or rot tail. General ornamental fish owners or fish aquaculture farmers usually due to mixed infection with other diseases often to the neglect of the disease, resulting in significant losses. In order to provide effective prevention and treatment of this disease, the preliminary experiment confirmed cases for F. columnaris strains of 16SrDNA location using molecular biology diagnostic methods to detect, PCR products were purified, cloned and sequenced. DNAstar and MegAlign software reuse and foreign strains isolated from the similarity of the comparative analysis, the results of up to 99.8% of its similarity. Another of the experiment for various disinfectants currently marketed antimicrobial effectiveness testing, the diluted concentrations were 100,10 and 1ppm, using sterilization blank tablet after immersion disinfectants, flat against on the cytophaga agar at 28 ℃ on a culture after 24-48 hours, the test results show that a variety of commercially available disinfectants diluted to the concentration for the bacteria were not significantly effect. Another test of copper sulfate were diluted to 10, 5 and 0.5 ppm concentration effect after detection, the test results showed that the concentration of copper sulfate diluted by the above test for the bacteria were no obvious effect. In drug susceptibility testing, this study has been identified for several strains of F. columnaris whom antibiotic susceptibility testing, the results show Ampicillin, Amoxicillin, Cephalexin, Florfenicol, Flumequine, Doxycycline, Erythromycin, Lincomycin and other drugs have a sensitivity. However, based on existing domestic aquatic animal drug regulations, there are still many non-approved use of the antibiotic classes. Our results provide only a reference to the academic research, in clinical disease control is still required to comply with the relevant regulations.
Books on the topic "Freshwater fish diseases"
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Green, W. Reed. Abundance of host fish and frequency of glochidial parasitism in fish assessed in field and laboratory settings and frequency of juvenile mussels or glochidia recovered from hatchery-held fish, Central and Southeastern Texas, 2012-13. U.S. Department of the Interior, U.S. Geological Survey, 2014.
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Landye, J. Jerry. San Juan River fish health surveys (1992-1999). U.S. Fish and Wildlife Service, San Juan River Basin Recovery Implementation Program, 1999.
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Schlotfeldt, Hans-Jürgen. What should I do?: A practical guide for the fresh water fish farmer. European Association of Fish Pathologists, 1995.
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Canadian Freshwater Aquaculture Symposium (2004 Québec City, Québec). Aquaculture Canada 2004: Proceedings of contributed papers, Canadian Freshwater Aquaculture Symposium, Québec City, Québec, October 17-24, 2004. Edited by Gilbert Eric, Stechey Daniel, Struthers Melissa, and Aquaculture Association of Canada. Aquaculture Association of Canada, 2006.
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San Juan River fish health surveys (1992-1999). U.S. Fish and Wildlife Service, San Juan River Basin Recovery Implementation Program, 2000.
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Nithikathkul, Choosak, Prasert Saichua, Louis Royal, and John H. Cross. Capillariosis. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780198570028.003.0065.
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Capillaria species are members of the superfamily Trichinelloidae. These worms have a filamentous thin anterior end and a slightly thicker oesophagus which is surrounded by glandular cells or stichocytes. This oesophageal pattern is called stichosomal oesophagus. Capillaria species are parasites which are found in many vertebrate animals. More than two hundred species have been reported in several vertebrate species, including fish, amphibians, reptiles, birds, and mammals (Cross 1992; Chitwood et al. 1968), but only three species infect humans. These are Capillaria hepatica , C. aerophila and C. philippinensis (McCarthy and Moore 2000). Of these intestinal capillariosis, a fish-borne parasitic zoonosis caused by C. philippinensis , is the most important. Humans acquire the parasite, C. philippinensis, by eating uncooked or raw freshwater fish (Cross and Basaca-Sevilla 1991). The disease is endemic mainly in Philippines and Thailand where there are many reported fatalities.Although C . hepatica is found in rodents worldwide, only a few cases of hepatic capillariosis have been reported in humans from Europe, Asia, Africa, North and South America. The infection is acquired by the ingestion of embryonated eggs from the soil. Female worms deposit eggs in the liver tissue and granulomas develop around the egg. The eggs are released after the rodent is eaten and the liver digested. Eggs pass in the faeces and are deposited in the soil where they embryonate. Avoidance of contaminated soil would prevent human infection and destruction of rodents would control animal infections.Only 12 cases of human infection caused by Capillaria aerophila have been reported, the majority from Russia. The parasite is found within tissue of the respiratory passages of canines and felines worldwide.Anatrichosoma cutaneum (Nematoda, Trichosomoididae), also included in this chapter, is primarily a subcutaneous parasite of monkeys, but there are two reports of cutaneous infections in humans resulting in serpiginous lesions in the skin of the soles, palms, and nasal passages. In addition there is a further suspected case isolated from a breast nodule and a possible case of mucosal lesions in the mouth reported. Whole monkey colonies can be infected with this parasite and control is difficult.
Book chapters on the topic "Freshwater fish diseases"
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de Kerckhove, Derrick T., and Cindy Chu. "Freshwater ecosystems in North America with reference to the Great Lakes Basin." In Climate change and infectious fish diseases. CABI, 2020. http://dx.doi.org/10.1079/9781789243277.0001.
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Liew, Jia Huan, Rayson B. H. Lim, Bi Wei Low, et al. "Tropical freshwater ecosystems, biota and anthropogenic activities with reference to South-East Asia." In Climate change and infectious fish diseases. CABI, 2020. http://dx.doi.org/10.1079/9781789243277.0019.
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Dar, Gowhar Hamid, Rouf Ahmad Bhat, Azra N. Kamili, et al. "Correlation Between Pollution Trends of Freshwater Bodies and Bacterial Disease of Fish Fauna." In Fresh Water Pollution Dynamics and Remediation. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8277-2_4.
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Velappan, Muralidharan, and Deecaraman Munusamy. "Occurrence of Mycotoxins in Certain Freshwater Fish Species and the Impact on Human Health: A General Review." In Aflatoxins [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97286.
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Mycotoxins are toxic secondary metabolites produced by organisms of the fungus kingdom, which are capable of causing disease and death in humans and animals when present in food. Recent studies evinces fish consumption might become another way for mycotoxins to enter the human food chain. Although the increasing research publications related to the occurrence and prevention of mycotoxin contamination in fish feeds, there was limited studies on bioaccumulation of mycotoxins research in common freshwater fish species. Further this was assumed fish species of salmonid and cyprinids are very sensitive to feed-borne mycotoxins so far. Studies have demonstrated, fish may also carry mycotoxins residue along the food chain, thus compromising human health. This review describes mainly mycotoxin contaminations in certain freshwater fish species and the impact on human health due to their potential proven toxicity. This review also provided comprehensive information on mycotoxins contamination levels in muscle and liver tissue of some freshwater fish species such as Nile tilapia, Labeo rohita, and Catla catla during capturing in fresh water lakes and also fish sold at wet market and hypermarket in Chennai, Tamilnadu.
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Bronstein, Judith L. "Mutualisms." In Evolutionary Ecology. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195131543.003.0031.
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The unusual behavior of cleaner fish has attracted both popular and scientific curiosity since its discovery early in the 20th century. These fish apparently make their living by removing external parasites from “host” fishes of other species (some also remove bacteria or diseased and injured tissue). When they approach cleaners, hosts assume an unusual motionless posture that allows cleaners to feed from their scales, from their gill cavities, or even inside their mouths. For their trouble, cleaner fish get a meal, and hosts get a good cleaning. The interaction between cleaner fish and their hosts is generally classified as a mutualism, or mutually beneficial interaction between species. Stories about this and other mutualisms have become staples of nature documentaries and the popular literature and have helped lure many students into a lifetime of studying biology. From the perspective of evolutionary ecology, however, the cleaner-host relationship is anything but straightforward (Poulin and Grutter 1996). First, it is not at all clear that this interaction confers reciprocal fitness benefits. Despite several decades of effort, only one study has shown that cleaners significantly reduce hosts’ parasite loads (Grutter 1999), and none has yet demonstrated that reducing parasite loads increases host success. Since cleaners often gouge the host’s flesh, particularly when parasites are few, the interaction is often more costly than beneficial. Second, if cleaning does not confer an advantage, it is not evident why hosts should tolerate and even actively solicit cleaners’ attention. In fact, sometimes hosts lure cleaners only to eat them, but the conditions under which it might be beneficial for a host to doublecross its cleaners like this remain unexplored. Third, we don’t really understand how cleaning behaviors arose in the first place, considering that the first individuals that approached hosts to feed on parasites were very likely eaten. Despite this constraint, cleaning has apparently evolved multiple times; it is found in at least five families, in both marine and freshwater species, and in both the temperate zone and the tropics.
Conference papers on the topic "Freshwater fish diseases"
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Scherr, Thomas F., Gerald Knapp, Terrence Tiersch, W. Todd Monroe, and Krishnaswamy Nandakumar. "The Activation of Zebrafish Sperm Cells in a Micromixer." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14734.
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The freshwater fish, Danio rerio (zebrafish), have become widely used as a model organism for vertebrate development, DNA mutation, and human disease studies [1]. Maintaining live colonies of the numerous developed strains of zebrafish under investigation can be prohibitively costly. As such, there is a growing need to catalog their reproductive cells and have them available on demand [2]. Thus cryopreservation of model strain gametes has become an important endeavor, where evaluation of freezing and thawing techniques is currently a bottleneck to these procedures.