TÓM TẮT: Bài báo công bố một loài cá mới, cá thè be sọc lớn Acheilognathus nguyenvanhaoi sp. n., loài mới được mô tả dựa vào mẫu thu được từ sông Tiên Yên, tỉnh Quảng Ninh, Bắc Việt Nam. Loài mới khác với các loài còn lại ở những đặc điểm: có 1 sọc dọc, to đều, đen đậm ở mỗi bên thân chạy từ mút mõm đến mút các tia giữa vây đuôi thay vì cao nhất cũng chỉ từ sau nắp mang tới gốc vây đuôi, không to đều; công thức răng hầu (5.1-0.5 thay vì 5-5); số tia gai vây lưng và vây hậu môn (III-IV thay vì III) và số vảy trên đường bên (7 thay vì nhiều nhất là 6). Loài mới khác với hai loài A. meridianus và A. barbatus ở số lượng vảy trước vây lưng; khác với các loài A. meridianus, A. barbatulus và A. melanogaster về số lượng đốt sống; khác với loài A. melanogaster ở chiều dài râu một cách rõ rệt; khác với các loài A. brevicaudatus và A. melanogaster về số lược mang cung mang I và khác với hai loài A. barbatulus và A. melanogaster về tỷ lệ chiều dài giữa ngăn trước và ngăn sau của bóng hơi.
Mangroves are a diverse and rich ecosystem, in which many animals are associated, including benthos. Species composition and occurrence of these animals are driven by the mangroves and tidal conditions. To examine how the benthic animal is distributed in mangrove habitats from northern Vietnam, two surveys in 2019 were conducted in Tien Hai Wetland Nature Reserve, which resulted in a total of 89 species, belonging to 56 genera and 35 families of zoobenthos. This is the first publication of these animals in the study site. The two major groups of benthic animals in the ecosystem were Crustacea and Mollusca, which occupy 54.02% and 36.78% of the total species, respectively. There are several new records of these animals from the coastal mangroves of Vietnam. Two species were new data for northern Vietnam (Scopimera curtelsoma and Parasesarma eumolpe), and four species were new records for Vietnam (Laemodonta punctigera, Cassidula nucleus, Pythia cecillei and Microtralia alba). Also, the present study shows distributional characteristics of the benthic animal community in mangrove forests. The present study indicates that benthic animals show an increase in species diversity and density from the river mouth to the continent. Seasonally quantitative data of benthic from the study site are the first work in mangrove forests of Vietnam. Recent findings are fundamental data for further studies on zoobenthos and related issues to preserve biodiversity in the mangrove forests in Vietnam.
Gobies are dominant in terms of both species diversity and abundance in estuarine habitats, but little is known about their early developmental stages in the coastal waters of Vietnam. To examine species diversity of goby larvae and juveniles, monthly collections were carried out using a small seine net from the Ka Long estuary in the northernmost Vietnamese coast, from September 2014 to August 2015. A total of 1,334 goby fishes of 20 species or more in three families (Butidae, Oxudercidae and Gobiidae) were caught, including nine unidentified species. This is the first record of gobies at early developmental stages from an estuary in Vietnam. The family Oxudercidae was the most abundant in terms of total species, and Gobiopterus chuno was the most frequent species in the study area. The goby specimens collected were mostly postflexion larvae and juveniles, ranging from 2.3 mm to 99.1 mm in body length. The size of nine dominant gobies was around 10 mm body length. In the study site, goby fishes are from tropical, subtropical and temperate zones, suggesting this goby fauna can display transitional biodiversity from tropical to temperate waters.
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