Biological Resources for Development of Aquaculture in Thi Nai Lagoon, Vietnam

Abstract

The diversity of aquatic resources in Thi Nai Lagoon decreased due to the lack of harmonious use and integrated long-term planning on the use of living resources. There remained a lack of mechanisms and regulations for coordination of activities in the lagoon by Binh Dinh Provincial People’s Committee (PPC). The aim of the study was to investgate the aquatic species and water quality in Thi Nai Lagoon, Vietnam. Data were collected at 23 different points on Thi Nai Lagoon, with three replicates at each point. There were 106 species of fish presented on the lagoon and in different sizes, including 17 mollusc species and 15 crustaceans species. In the dry season, there were 167 phytoplankton species in five divisions, 10 classes in 39 orders in 59 families including 77 genus. Zooplankton had eight chordata in 10 classes of 18 orders including 44 families, 64 genus and 102 species. Arthropoda had the largest number of species, 78 species, accounting for 76.5% of total species. In the rainy season, only 48 species of Arthropoda, Cnidaria, Annelida, Chaetognatha and Rotifer were affected and some were not encountered in the wet season, such as mollusca and chordata. While water quality variables were still good for aquaculture, within permitted limits of TCVN standard and criteria, there were still problems caused by production discharges and living activities of inhabitants around the lagoon, such as sedimentary matters.