ASSESSMENT OF THE CURRENT STATUS OF FRESH WATER MUSSELS USED MATERIALS FOR PEARL FARMING IN TUYEN QUANG PROVINCE

Abstract

This study aimed at analyzing, evaluating and drawing some comments on the current status of freshwater mussels in Na Hang - Tuyen Quang - one of the important materials serving for pearl mussel farming. Result indicates that there are two common mussel species, including: Sinohyriopsis cumingii Lea 1852 and Cristaria bialata Lea 1857, and some other unidentified mussel species. In which, mussel species, namely Sinohyriopsis cumingii Lea 1852, accounted for 71.15%, while mussel species (C. bialata Lea 1857) accounted for 15.38%. Other unidentified mussel species is 13.46%. Mussel species, namely Sinohyriopsis cumingii Lea 1852, appears more frequently (73.08%) than mussel species with only 13.46% (C. bialata Lea 1857), and other mussel species is 17.31%. These two main species of mussels are mainly distributed in inactive water area compared to flowing water area, and their occurrence frequency is rare. Species Sinohyriopsis cumingii Lea 1852 has a higher frequency (73.08%) than C. bialata Lea 1857 that is 13.46% and other species is 17.31%.