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Ministry of Education and Training Vietnam Academy MINISTRY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ---------------------------- HOANG VAN HIEN NEMATODE SPECIES COMPONENT IN SOME PERCIFORMES FISHES IN COASTAL REGIONS OF VIET NAM Major: Parasitology Code: 9 42 01 05 SUMMARY OF BIOLOGY DOCTORAL THESIS HA NOI - 2019 The thesis is completed at: GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY VIETNAM ACADEMI OF SCIENCE AND TECHNOLOGY Supervisors: 1: Ass. Prof. Dr. Ha Duy Ngo 2: Dr. Nguyen Van Duc Reviewer 1: ........................................................................ ........................................................................................... Reviewer 2: ........................................................................ ........................................................................................... Reviewer 3: ........................................................................ ........................................................................................... The dorteral thesis will be defended at the Evaluation Committee of: GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY Time: Date......month.......2019 The thesis can be found at: - The library of Graduate University Science and Technology - National Library of Vietnam INTRODUCTION 1. THE THESIS NECESSARY The risks of fish parasites, especially nematodes, to human and animal health constitute are an important problems. The infections are not only caused health deficiency or disability of humans and animals but also reduce productivity and profitability of aquacultute, increase economic burden due to the costs for disease treatment and prevention. Although parasitic deseases caused many harmfulness, they have received little attention from scientists, managements. Our study of the composition of the parasitic nematodes in marine fishes in the off Vietnam is urgently needed. The survey’s results are not only provide the information about the fauna of fish’s nematoda, the relation between hosts-parasites, but also assess the the potential risks for human consumption. 2. OBJECTIVES To have the knowleadge of the nematode fauna from Perciformes fishes in the sea off Vietnam. 3. THE RESEARCH CONTENTS * To study and build the systematic of nematode fauna from Perciformes fishes in the off Vietnam. * To describe the morphological features of some selected nematode species. * To know the current status of nematode infections (prevalence, intensity of infection) in some Perciformes fish species (Perciformes) in the off Vietnam. 1 4. THE SCIENTIFIC AND PRACTICE SIGNIFICANCE OF THE THESIS - Providing the composition and the distribution of the parasitic nematodes from Perciformes fishes in the off Vietnam,, including a new records of host species. Especially,, 19 nematode species were found and described for the first time in Vietnam. - Providing the morphological data (measurement, drawings and images, classification system) of all nematode species which were collected in this study. - Contributing the data of parasitic nematodes for the book "Fauna of Vietnam: Parasitic roundworm in Vietnamese marine fishes" later. 5. THE THESIS STRUCTURE The thesis consists of 150 pages, in which: Introduction 2 pages; Literature review 20 pages; Materials and research methods 13 pages; Results and Discussions 104 pages; Conclusion and Suggestions 1 page. The published works, which are related to the thesis 1 page; References 9 pages, include 13 documents in Vietnamese and 81 documents in the foreign languages. The thesis has 11 tables, 47 figures and illustrations, diagrams and 16 appendix pages. I. Chapter 1. OVERVIEW 1.1. Basic characters of parasitic nematodes: General morphological features, biological characters, life cycle of nematodes, the distribution and harmfull effects of nematodes were provided. 2 1.2. Summary of the parasitic roundworm classification system: The outline of the nematode classification system in the World and Vietnam were summarized. 1.3. Some basic characters of the Vietnamese marine fish fauna, including the Perciformes order: General characters of marine fish fauna in Vietnam, especially fishes belong to Perciformes order were mentioned. 1.4. The studying situation of parasitic nematodes in marine fishes. 1.4.1. Research on parasitic nematodes in marine fishes in the Western Pacific region Research on parasitic helminths in marine animals has been conducted since the late 19th century, but it was received more attention by scientists from the miStole of the 20th century. Particularly, the data of nematode fauna from the Western Pacific region has been avaiable about three late decades. Wu (1927) had the first report of parasitic nematode from marine fish in the off China, the author described one nematode species Paraleptus scyllii from sharkes Chiloscyllium plagiosum in Taiwan sea . Up to 1965, Chinese scientists continued to investigate the parasite fauna from marine fishesin this region. In 2011, Peng et al. listed a total of 90 species of nematodes belonging to 31 genera, 13 families, 9 supperfamilies, 3 orders and 2 subclasses in marine fishes in China. However, this list already included all species (19 nematode spcies) which were found by scientists from Vietnam and the former Soviet Union in the East Sea of Vietnam (South China Sea). 3 Arthur et al. (1997) listed 201 parasitic species in Philippine fishes, including 20 species of nematoda. In this list has presented of Capillaria philippinensis, which can infecting to human. In Thailand, Purivirojkul (2004) found 11 nematode species from marine fishes. Jakob et al. (2006) identified 38 helminthic species in marine fish in Java Island, Indonesia; including 5 nematoda species. Akhtar et al. (2006) recorded 7 families, 9 subfamilies, 23 genera and 71 species of nematoda from fishes in the off Pakistan. Later, Kazmi et al. (2013) listed 90 nematode species in whole country. In Japan, studies on parasitic helminths in marine fish were early carried out, e.g. Layman (1930)found the species Capillaria helenae. Recently, Nagasawa et al. (2007) identified 7 nematode species of 7 genera. Arthur et al. (2015) has recorded 24 species of nematode parasites in fish in the off Malaysia. Almost species were identified to genus. 1.4.2. The studying situation of parasitic nematode from marine fishes in Vietnam. Research on the system of the parasitic helminth from marine fishes in Vietnam has only been carried out after 1960. The Russian scientists autopsied 1,118 individuals of 53 fish species, 16 families from the off East Sea. Among them, 888 individuals of 44 species belong to Perciformes. The authors 4 have discovered and described 42 new species, including one species of Nematoda. Le Van Hoa et al. (1972), the first Vietnamese parasitologists, described 2 new Bulbocephalus species from Thread finfish. Hà Duy Ngọ et al. (2009) found 2 nematode species genera Capillaria and Anisakis in the off Ha Long, Quang Ninh Province. Vo The Dung (2010) detected 54 parasitic species from the grouper Epinephelus spp. in the off Nha Trang, Khanh Hoa province, including 34 identified species and 20 other unidentified species. Especially, 8 nematode species were listed. Nguyen Van Ha (2011) described a new species Ascarophis moraveci from 3 fish species in the off Ha Long, Quang Ninh province. Dang Nguyen Anh Tuan et al. (2015) recorded a species Camallanus sp. from Parupeneus spp. in off Nha Trang, Khanh Hoa province. Chapter 2. MATERIALS AND METHODS 2.1. Subjects, sites and time of the study 2.1.1. Subjects of the study Subjects of this study were parasitic nematodes that collected on from Perciformes marine fishes. 2.1. 2. Time of the study: from 10/2014 to 12/2017 2.1.3. Places of study: Nine provinces of 3 coastal regions in Vietnam (Figure 1) 5 Figure 1: Study sites 2.2. Study methods Nematode specimens were collected by using a “comprehensive examination” method of Skrjabin (1928). Samples were fixed, and made slides by using a method of De Grisse (1969). Morphological characters of nematodes were 6 studied by using photographic scanning of electron microscope (SEM) (Fagerholm , 1982) or by light microscope (Olympus CH40); all characters were drawings with the aid of camera lucida and then were redrawn using Adobe Illustrator CS6. All measurements are also given. Larval samples were examined by using molecular . All nematode specimens are preserved and stored at the Department of Parasitology, Institute of Ecology and Biological Resources. The references which most using for identification of nematodes are listed below: - Systema helminthum, Volume III, part I - The nematodes of vertebrates (Yamaguti, 1961). - Keys to the Nematode Parasites of Vertebrates (Anderson et al., 2009). - Systematic position and phylogeny. In Lee D. L. (Eds), The biology of nematodes (De Ley et al., 2002). - A new system for Nematoda: combining morphological characters with molecular trees, and translating clades into ranks and taxa In Nematology Monographs and Perspectives (De Ley et al., 2004). - Trichinelloid nematodes parasitic in cold-blooded vertebrates (Moravec, 2001). - Metazoan parasites of Salmonid fishes of Europe (Moravec, 2004). The fish hosts were identified by morphological method, using the references below: Fauna of Vietnam, episode 17; 19 (Sea bass); FAO species identification guide for fishery purposes; Database of fishes (www.fishbase.org). 7 Chapter 3. RESULTS 3.1. The composition of parasitic nematodes from Sea bass fishes in the off Vietnam. A total of 7951 individuals
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