The abstract of PhD thesis in Biology sciences: Study on biological characteristics and development of seed production technology for the blotched sankehead Channa maculata (Lacepède, 1801)

Research objectives: To determine the nutritional, reproductive characteristics of wild blotched snakehead as a scientific basis for developing its breeding and nursery techniques; to establish a number of specifications in the production of blotched snakehead in artificial conditions.
Nội dung trích xuất từ tài liệu:
The abstract of PhD thesis in Biology sciences: Study on biological characteristics and development of seed production technology for the blotched sankehead Channa maculata (Lacepède, 1801)MINISTRY OF EDUCATION VIETNAM ACADEMY OF AND TRAINING SCIENCE AND TECHNOLOGY INSTITUTE OF SCIENCE AND TECHNOLOGY ----------------------------- TA THI BINH STUDY ON BIOLOGICAL CHARACTERISTICSAND DEVELOPMENT OF SEED PRODUCTION TECHNOLOGY FOR THE BLOTCHED SANKEHEAD Channa maculata (Lacepède, 1801) Major: Zoology Code: 9 42 01 03 The abstract of PhD Thesis in Biology Sciences HANOI– 2020 iTHIS THESIS IS COMPLETED AT INSTITUTE OF SCIENCE AND TECHNOLOGY,VIETNAM ACADEMYSupervisors: 1. Assoc.Dr. Nguyen Huu Duc 2. Dr. Do Van TuExaminer 1: …Examiner 2: …Examiner 3: ….The thesis will be defended infront of thesis defense comitee at Institute of Science andTechnology-Vietnam Academy at/in …2020.This thesis can be found at:- Institute of Science and Technology Library- Vietnam National Library iiINTRODUCTION Among freshwater fish species, Channidae (belonging to Anabantiformes ordo) areof interest to both international and vietnames researchers due to their large size, deliciousmeat and high vitality. Many species have been well studied for their biologicalcharacteristics, seed production and important aquaculture development in Asian countriessuch as Vietnam, Thailand, Cambodia, Philippines, India and Malaysia (Muntaziana et al.,2013). In Vietnam, Channidae has only one Channa genus which comprises 12 speciesdistributed across the country with many different names based on local languages. Inparticular, the the striped snakehead (C. striata) and the giant snakehead (C. micropeltes)have been extensively studied and developed for aquaculture because of their large size andhigh economic value (Nguyen Huan and Duong Nhut Long, 2008). Recently, much attention has been paid on biological characteristics and seedproduction of the forest snakehead (C. lucius) (Tien Hai Ly, 2016), the dwarf snakehead (C.gachua) (Ho My Hanh, 2017). While the blotched snakehead(C. maculata) is a potentialspecies for aquaculture, however, its information of biological characteristics is limmited.There have been a few studies on taxonomy and some biological characteristics of theblotched snakehead as well as preliminary results on artificial seed production (Nguyen ThaiTu, 1983; Mai Dinh Yen, 1978; Nguyen Van Hao, 2005; Nguyen Dinh Vinh et al., 2015; TaThi Binh et al., 2015). The study of biological characteristics, a basis for development of artificial breedingtechniques and introduction of C. malacuta to aquaculture, is essential to contribute to thediversification of cultured species, maintaining and developing resources, protecting genepool and preserving biodiversity. According to Pravdin (1973), understanding biologicalcharacteristics of a species is an extemely important step to successfully domesticate andintroduce the species to aquaculture. Therefore, the project study on biologicalcharacteristics and development of seed production technology for blotched snakeheadChanna maculata (Lacepède, 1801) was carried out to address the above important need.Research objectives: To determine the nutritional, reproductive characteristics of wild blotched snakeheadas a scientific basis for developing its breeding and nursery techniques. To establish a number of specifications in the production of blotched snakehead inartificial conditions.Research contents: Study some biological characteristics of the blotched snakehead in the nature : - Nutritional biology - Reproductive biology Development of techniques to produce blotched snakehead seed in artificial conditions: - Broodstock rearing - Spawning stimulation techniques - Nursing of larvae to fry - Nursing of fry to fingerlings 1CHAPTER 1. LITERATURE REVIEW1.1. CLASSIFICATION According to Eschmeyer (2018), the blotched snakehead C. maculata (Lacepède, 1801)is classified as below: Kingdom Animalia. Phylum: Chordata. Class: Actinopteri. Ordo: Anabantiformes. Sub-ordo: Channoidei. Family: Channidae. Genus: Channa. Species: Channa maculata (Lacepède, 1801)1.2. Status of research on the blotched snakeheadin the world and in Vietnam1.2.1. Status of research on the blotched snakeheadin the world The blotched snakehead was discovered before 1900 in Oahu, Hawaii and iswidely distributed in Oahu (Yamamoto and Tagawa, 2000). Studies of the distributioncharacteristics of the blotched snakehead have revealved that this species is distributed intropical and subtropical countries such as China, Taiwan, the Philippines and NorthVietnam. In addition, they have been introduced to Japan, Hawai and Madagascar (Waterand James, 2004). In China, Fang Fang et al. (2002) reported that the blotched snakeheadwas the second most important cultured species and was mainly cultured in Guangdongprovince. At present, this species is considered to be one of the food sources in Taiwan andNara, Hyogo, Hiroshima (Japan) and Philippines (Okada, 1960; Liang et al., 1962; Hay andHodgkiss, 1981; Uyeno and Akai, 1984 cited from Water and James, 2004). Some other studies focused on nutrition, disease and comercial productiontechniques. For instance, according to Y ...