Nguyễn Anh Tuấn * , Dương Nhựt Long Lê Quốc Việt

* Người chịu trách nhiệm về bài viết: Nguyễn Anh Tuấn (email: tuanctu@ctu.edu.vn)

Abstract

The experiment on giant freshwater prawn (Macrobrachium rosenbergii) culture was carried-out in Long An village, Long Ho District and Long Phu village, Tam Binh District,VinhLongProvincefrom May to November, 2003.  Two different stocking densities of 8 (treatment 1) and 12 juvenile/m2 (treatment 2) were randomly designed in six ponds of 1000 - 1200 m2 /each.  The initial size of  prawns were 0.46 - 0.71 g, 3.12 - 3.43 cm.  Prawns were fed by 50 % pellet feed (32 ? 36 % of protein) and 50 % freshwater trash fish.  Feeding rate and feeding frequency were 3 ? 7 % /total body weight /day and two times per day, respectively.  The results showed that the water quality in cultured system such as water temperature, water pH, transparency, oxygen, N-NH4+, N-NO2- and H2S were acceptable values for the freshwater prawn growing and developing.  The survival rate of freshwater prawn in earthen ponds obtained in treatment 1 (39.8 ±  2.2 %) was not significantly higher (P > 0.05) than those in treatment 2 (34.9 ± 2.2 %) after 180 days.  The growth rate of prawn obtained in treatment 1 (0.22 g /day) was significantly higher (P < 0.05) than that in treatment 2 (0.18 g/day).  The highest yield of freshwater prawn trial in earthen ponds was 1,130 kg/ha.  Freshwater prawn culture at 8 juvenile/m2 in earthen ponds could be utilized for improving farmer?s income in theMekongDelta.
Keywords: Stocking density

Tóm tắt

Abstract

The experiment on giant freshwater prawn (Macrobrachium rosenbergii) culture was carried-out in Long An village, Long Ho District and Long Phu village, Tam Binh District,VinhLongProvincefrom May to November, 2003.  Two different stocking densities of 8 (treatment 1) and 12 juvenile/m2 (treatment 2) were randomly designed in six ponds of 1000 - 1200 m2 /each.  The initial size of  prawns were 0.46 - 0.71 g, 3.12 - 3.43 cm.  Prawns were fed by 50 % pellet feed (32 ? 36 % of protein) and 50 % freshwater trash fish.  Feeding rate and feeding frequency were 3 ? 7 % /total body weight /day and two times per day, respectively.  The results showed that the water quality in cultured system such as water temperature, water pH, transparency, oxygen, N-NH4+, N-NO2- and H2S were acceptable values for the freshwater prawn growing and developing.  The survival rate of freshwater prawn in earthen ponds obtained in treatment 1 (39.8 ±  2.2 %) was not significantly higher (P > 0.05) than those in treatment 2 (34.9 ± 2.2 %) after 180 days.  The growth rate of prawn obtained in treatment 1 (0.22 g /day) was significantly higher (P < 0.05) than that in treatment 2 (0.18 g/day).  The highest yield of freshwater prawn trial in earthen ponds was 1,130 kg/ha.  Freshwater prawn culture at 8 juvenile/m2 in earthen ponds could be utilized for improving farmer?s income in theMekongDelta.

Key words: Freshwater prawn, Stocking density, Feeding rate

Title: Experimental culture of giant freshwater prawn (Macrobrachium Rosenbergii De Man, 1897 ) at different stocking densities in earthen ponds

Từ khóa: 1

Article Details

Tài liệu tham khảo

Ang K.J and Cheah S.H., 1987. Juvenile production of Malaysia Giant freshwater Prawn (Macrobrachium rosenbergii De Men) using modified static “green water” system. In Development and management of tropical living aquatic resources. UPM, pp141-144.

APHA, 1995. Standard methods for examination of water and wastewater.

Bộ Thủy Sản, 2000. Phát triển nghề nuôi thủy sản nước ngọt ở ĐBSCL.

Boyd, C. E, 1998. Water quality in ponds for aquaculture.

Hien, T.T.T and et al, 1998. Current status of Freshwater Prawn Culture in the Mekong delta of Viet Nam.

New, M.B. and Singholka, 1985. Freshwater prawn farming. A manual for the cultrure of Macrobrachium rosenbergi.

Phương, N. T., T. N, Hải, 2001. Bài giảng kỹ thuật nuôi thủy sản. ĐHCT.

Thắng, N. V,1995. Kỹ thuật nuôi tôm càng xanh. NXB Nông nghiệp Thành phố Hồ Chí Minh.

Trụ, V. T, 1994. Cải tiến kỹ thuật nuôi tôm tại Việt Nam. NXB Nông Nghiệp.