Tạp chí Nghề cá sông Cửu Long - Số 07/2016

TÓM TẮT

Nghiên cứu được thực hiện tại vùng rừng ngập mặn Thạnh Phong, Thạnh Hải, huyện Thạnh Phú,

tỉnh Bến Tre qua 5 đợt khảo sát từ tháng 4 đến tháng 8 năm 2014 với 330 mẫu nghêu giống, 60 mẫu

thức ăn trong ruột nghêu, 60 mẫu đất nền đáy đã được thu và đo một số chỉ tiêu chất lượng nước

tại 33 điểm bao gồm: 13 điểm vùng ven biển (lớp biển), 11 điểm vùng kênh rạch sát biển (lớp giữa)

và 9 điểm vùng rừng ngập mặn (lớp rừng). Mẫu nước được đo tại hiện trường các chỉ tiêu nhiệt

độ, độ muối, độ trong và pH. Mẫu đất được thu bằng khoan đất và gàu đáy chuyên dùng. Mẫu ấu

trùng nghêu phù du và nghêu giống được thu bằng lưới có kích thước mắt lưới tương ứng 30μm

và 1mm và được cố định bằng cồn. Mẫu phân tích thức ăn trong ruột nghêu và độ béo được tiến

hành bằng cách đo chiều cao, khối lượng nghêu không có vỏ, cố định ruột bằng dung dịch formol.

Mẫu được phân tích tại phòng thí nghiệm Viện Nghiên cứu Nuôi trồng Thủy sản II. Kết quả nghiên

cứu cho thấy, các yếu tố chất lượng nước có giá trị nằm trong giới hạn bình thường cho thủy sinh

vật và nghêu phát triển. Ở vùng ven biển, nhóm đất cát chiếm 94,28%, có tính chất rời rạc, thấm

nước dễ và cũng khó giữ nước. Ở vùng kênh rạch sát biển, có lượng bùn cát trung bình (41,20%

thịt và 2,77% sét). Ở vùng trong rừng ngập mặn, nền đáy chủ yếu là bùn có hàm lượng thịt và sét

cao. Nghêu giống chỉ phân bố ở vùng ven biển Thạnh Phong, Thạnh Hải nơi có nền đáy là cát bùn,

thành phần cát trung bình chiếm 94,28 ± 2,14% và nghiên cứu không xác định nghêu giống phân

bố ở vùng kênh rạch và trong rừng ngập mặn. Độ béo của nghêu vào tháng 6/2014 cao hơn tháng

7/2014. Thành phần thức ăn trong ruột nghêu đa số là mùn bã hữu cơ, chiếm từ 73,68%-91,67% và

tảo từ 8,33%-26,14% số lượng thức ăn trong ruột nghêu.

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FARMING PRACTICES AND CHALLENGES TO REACH FOOD 
STANDARDS OF SMALL-SCALE SHRIMP FARMS 
IN THE MEKONG DELTA
Phan Thanh Lam1*
ABSTRACT
Shrimp culture becomes main occupation of many farmers in the coastal areas of the Mekong 
River Delta (MKD); however, shrimp farming has not really sustainable. This study is to assess 
the current farming practices and challenges to reach international food standards of small-scale 
shrimp farms. This study was carried-out in four coastal provinces in the MKD,A randomized 
stratified sampling method was used to select survey-sites and survey-farms for interview. The 
230 belongings to five typical shrimp farming systems in the MKD were selected for face-to-face 
interviewing. The findings show that many shrimp farms were likely to reach several standard 
criteria such eFCR (≤1.8 in Black Tiger Shrimp culture, and ≤1.5 in White-legged Shrimp culture), 
stocking density (≤15PL/m2 in the lower investment shrimp system), survival rate (>25% in the 
lower investment shrimp system, and >60% in the higher investment shrimp system), no banned 
chemical/drug and wild-seed source use, community relationships, property rights, and biodiversity 
protection. However, there are still many standard criteria that farms could not meet such as criteria 
for effluent management (most farms release their waste water without any treatment and had no 
sediment basins), registration of farms (many farms were not legally registered), shrimp mortality 
management (lack of proper methods), labor arrangements (verbal contracts), farm hygiene, and 
recordkeeping requirements.With these current shrimp farming practices, it is still far behind to 
reach criteria of the food standards; therefore, the shrimp farms, especially small-scale farms 
need to be strengthened and to improved their infrastructure conditions and farming techniques to 
promote the adoption of international food standards.
Keywords: farming practices, small-scale farm, food standards.
 Người phản biện: TS. Vũ Anh Tuấn
Ngày nhận bài: 18/11/2015
Ngày thông qua phản biện: 18/12/2015
Ngày duyệt đăng: 25/12/2015
1. Department of Fisheries Ecology &Aquatic Resources, Research Institute for Aquaculture No.2 
* Email: pthanhlam@yahoo.com

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