Search

Your search keyword '"Hiep, Le Minh"' showing total 8 results
Start Over Author "Hiep, Le Minh"
8 results on '"Hiep, Le Minh"'

2. Distribution and density of Lutraria rhynchaena Jonas, 1844 relate to sediment while reproduction shows multiple peaks per year in Cat Ba-Ha Long Bay, Vietnam

Author

Hao Do Manh, Sy Do Trung, Tuyet Dao Thi Anh, Hiep Le Minh, Dat Nguyen Tien, Huong Do Thi Thu, Thung Do Cong, Nhon Dang Hoai, Lan Tran Dinh, and Van Quan Nguyen

Subjects
lutraria rhynchaena, cat ba-ha long bay, distribution, density, reproductive cycle, Biology (General), QH301-705.5
Abstract

Lutraria rhynchaena Jonas, 1844 is of great commercial interest, but its reserves have dramatically declined over recent decades. Therefore, there is an urgent need of scientific basis to propose effective fishery management measures and improve artificial aquaculture of the clam. In this study, we investigated the distribution and density of L. rhynchaena, sediment characteristics, and established the clam’s reproductive cycle through monthly observations from August 2017 to July 2018. The study results showed that distribution and density of clams are related to sediment types, and the sediment type of medium sand is likely the best benthic substrate for the clams. The spawning of clams occurred throughout the year with three spawning peaks in January, April and September. For the sustainable management of the clam resource in Cat Ba-Ha Long Bay, the fishery authorities can issue a ban on harvest of the clam in spawning peak months in January, April and September.

Published
2020
Full Text
View/download PDF

3. Density and de-nitrifying potential of indigenous bacterial assemblage in mangrove and seagrass in the North of Vietnam

Author

Huyen Le Thanh, Anh Tuyet Dao Thi, Hiep Le Minh, Dat Nguyen Tien, Binh Ha Thi, Sy Do Trung, and Hao Do Manh

Abstract

This study assessed the density and de-nitrification potential of indigenous microorganisms in mangroves and seagrass beds in northern Vietnam through two mangrove ecosystems in Tien Yen - Quang Ninh and Bang La - Hai Phong and three seagrass beds in Ha Coi and Dam Ha - Quang Ninh and Tam Giang - Thua Thien Hue. The analysis results of 4 sampling times in rainy and dry seasons during 2017–2019 showed that the density of de-nitrifying bacteria ranged from (1.0 × 102)–(4.6 × 103) MPN/mL, averaging 1.1 ± 0.3 × 103 MPN/mL. The density in mangroves was higher than that in seagrass (a = 0.05). De-nitrification rates ranged from 0.0 µgN/wet to 69.0 µgN/wet soil g/hour, averaging 18.4 ± 7.4 µgN/wet soil g/hour. The rate at the experiments added 0.5 mgN/L in seagrass was higher than that in the mangrove. The density and rate of de-nitrification were significantly correlated with many environmental factors, especially density of sulfur-oxidizing bacteria, the density of nitrifying bacteria, pH, Eh, Nts, N-NH4, P- PO4 and BOD5.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results