tailieunhanh - Báo cáo nghiên cứu khoa học: "NGHIÊN CỨU THỰC NGHIỆM ẢNH HƯỞNG CỦA MƯA AXÍT LÊN TÔM SÚ (PENAEUS MONODON)"

Tuyển tập các báo cáo nghiên cứu khoa học của trường đại học cần thơ trên tạp chí nghiên cứu khoa học đề tài: NGHIÊN CỨU THỰC NGHIỆM ẢNH HƯỞNG CỦA MƯA AXÍT LÊN TÔM SÚ (PENAEUS MONODON). | Tạp chí Nghiên cứu Khoa học 2006 20-24 Trường Đại học Cần Thơ NGHIÊN CỨU TH Ực NGHIỆM ẢNH HƯỞNG CỦA MƯA AXÍT LÊN TÔM SÚ PENAEUS MONODON Nguyễn Thị Kim Lan1 và Bùi Lai2 ABSTRACT Negative effects of acid-rain on Tiger shrimp Penaeus monodon were investigated at the Biological Experimental Station Institute of Tropical Biology from February to August 2005. Shrimp selected for the experiments were 28 days-old. Water used in the experiment was collected from the shrimp ponds which had pH and salinity of 12 and diluted with acid-rain water. Salt water was diluted with fresh-water to obtain desired salinity. Negative effects of individual pH and salinity on Tiger shrimp were designed based on Fundamentals of Biological Experiment whereas negative effects of both pH and salinity were carried out synthetically according to matrix chart of two factors and four levels of impact. LC50 was tested according to Gary M. Rand và Sam R. Petrocelli 1985 . The results showed that shrimp started to respond abnormally in water containing 14 of acid-rain water with pH and salinity of 12 Such abnormal responses of Tiger shrimp were mainly observed in the extensive and improved extensive ponds. When pH of water suddenly dropped from to in 12 water and not adjusted back to the original status mortality of shrimp increased to 50 after three days. Similarly when salinity in water with pH dropped to 50 of mortality was also observed after three days. The combinative impact of both pH and salinity on mortality of shrimp was performed by a correlation equation y - R2 0 68 where y is mortality of shrimp x1 is pH and x2 is salinity . Keywords acid-rain pH salinity tiger shrimp Title Study on the effects of acid-rain on black tiger shrimp Penaeus monodon TÓM TẮT Thực nghiệm nghiên cứu ảnh hưởng của mưa axít lên tôm sú được tiến hành tại Trạm Sinh thái Thực nghiệm Viện Sinh học Nhiệt đới thời gian từ 02 2005 đến 8 2005. Đối tượng thí nghiệm là tôm sú 28