tailieunhanh - Báo cáo nghiên cứu khoa học " INTENSIVE IN-POND RACEWAY PRODUCTION OF MARINE FINFISH (CARD VIE 062/04) - MILESTONE 2& 4 REPORT "

Sự phát triển của nuôi trồng hải sản tại Việt Nam đòi hỏi số lượng lớn cá biển để thả giống. Trong những năm gần đây, các hạt nhỏ của cá có giá trị cao như cá mú (Epinephelus spp.), Cá giò (Rachycentron canadum), cá chẽm (Lates calcarifer) và các loài khác được sản xuất trong trại sản xuất giống, đáp ứng một phần nhu cầu ngày càng tăng bởi nông dân nuôi cá. Không chỉ số lượng, nhưng cũng có kích thước cơ thể của giống được hạn chế. Cá biển chủ yếu là nuôi trong lồng tại Việt. | Ministry of Agriculture Rural Developme. AusAID Australian Government Project Progress Report Project title INTENSIVE IN-POND RACEWAY PRODUCTION OF MARINE FINFISH CARD VIE 062 04 MILESTONE 2 4 REPORT Two milestone reports are combined in one for ease in understanding of raceway technology and application of potential users Michael Burke QDPI F Australia Tung Hoang Nha Trang University Vietnam 12 2006 PART 1 Design and performance of floating raceways used to nurse fingerlings of marine finfish in Central Vietnam 1 Design and performance of floating raceways used to nurse fingerlings of marine finfish in Central Vietnam 1 1 9 1 1 3 Tung Hoang1 Phuong T. Luu1 Khanh K. Huynh2 Quyen . Banh1 Mao D. Nguyen1 Michael Burke3 11nternational Center for Training and Research Nha Trang University Vietnam 2 Khanh Hoa Fisheries Promotion Center Vietnam 3 Department of Primary Industries Fisheries Bribie Island Aquaculture Research Centre Bribie Island Queensland Australia 1. INTRODUCTION The development of mariculture in Vietnam requires large number of marine fish fingerlings for stocking. In recent years small seeds of high-value fish such as grouper Epinephelus spp. cobia Rachycentron canadum barramundi Lates calcarifer and other species are produced in hatcheries meeting part of the increasing demand by fish farmers. Not only quantity but also body size of fingerlings is limited. Marine finfish are mostly cultured in cages in Vietnam. Stocking therefore requires fingerlings larger than 80 100 mm in total length. In hatcheries the production of large fingerling is costly and apparently constrained by limited nursing tank area. Poor survival and difficult husbandry are recorded also with nursing in ponds Le Xan 2005 . Floating raceways have been recently trialled successfully for freshwater fish farming in USA Australia and Germany. Despite of their relatively high capital and running costs the use of floating raceways has a number of advantages including i high stocking .