Thành phần thực vật phiêu sinh và mối liên hệ với các thông số môi trường nước trong các ao nuôi cá tra (Pangasianodon hypophthalmus)
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Abstract
The study aimed to find out the species composition of harmful algae and their relationship with water quality parameters in striped catfish ponds. A total of 6 fishponds were divided into two groups, each group consisting of 3 ponds. The striped catfish ponds had an average density of 60±10 fish m-2 (group A1) and 81±11 fish m-2 (group A2). The results indicated that the species composition of phytoplankton as well as blue-green algae did not vary significantly between groups A1 (128 species and 17 species) and A2 (127 species and 15 species). The densities of blue-green algae in ponds of group A1 were lower than those of group A2. The algal species composition was not significantly correlated (p>0.05) with water environment parameters, while the density was affected remarkably by temperature and PO43- content. The species composition and abundance of blue-green algae were closely correlated with water environment parameters, including temperature, pH, DO, alkalinity, TSS, PO43-, NO3-, and TP concentrations. The findings of the study were effective in managing algae and maintaining favorable water quality in striped catfish ponds.
Tóm tắt
Nghiên cứu được thực hiện nhằm tìm ra thành phần loài tảo gây hại và mối liên hệ với các thông số môi trường nước trong các ao nuôi cá tra. Tổng cộng có 6 ao nuôi cá tra được chia thành hai nhóm, mỗi nhóm gồm có 3 ao. Các ao cá tra có mật độ trung bình là 60±10 con/m2 (nhóm A1) và 81±11 con/m2 (nhóm A2). Kết quả cho thấy thành phần loài thực vật phiêu sinh cũng như tảo lam không có sự khác biệt lớn giữa nhóm A1 (128 loài và 17 loài) và A2 (127 loài và 15 loài). Mật độ tảo lam trong các ao cá tra của nhóm A1 thấp hơn A2. Thành phần loài TVPS tương quan không có ý nghĩa (p>0,05) với các thông số môi trường nước, trong khi mật độ ảnh hưởng bởi nhiệt độ và PO43-. Thành phần loài và mật độ tảo lam có mối liên hệ chặt chẽ với các thông số môi trường nước như nhiệt độ, pH, DO, độ kiềm, TSS, PO43-, NO3-, và TP. Kết quả của nghiên cứu có giá trị trong quản lý tảo và duy trì chất lượng nước phù hợp trong các ao nuôi cá tra.
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