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Abstract

Fish in Semilabeo genus has been listed in high risk of endangerment in the wild and some species in this genus show similar characteristics. A total of 30 fish in Semilabeo genus collected from Ha Giang, Phu Tho provinces and Research Institutes for Aquaculture No1 (RIA1), Viet Nam was classified using morphological taxonomy and molecular biology methods. The results revealed that the morphological analysis identified 2 species in the genus of Semilabeo, S. obscurus (Peters, 1881) and Semilabeo obscurus (Lin, 1881). The molecular method using COI sequences revealed highly similar results between Ha Giang and Phu Tho groups but were differ from the group collected in RIA1. Based on BLAST result, COI gene sequences of samples collected in Ha Giang and Phu Tho were homogenous with those of Semilabeo notabilis species 99-100%, whereas, RIA1 group showed high similarity with Semilabeo obscurus. Besides, genetic distance and Neighbor-Joining tree view using COI indicate the two species: 1) Semilabeo notabilis (Peters, 1881) and 2) Semilabeo obscurus (Lin, 1881). In this study, the two analysis using morphological taxonomy and molecular biology showed the same findings in term of species identification for fish in Semilabeo genus collected in some areas in Viet Nam.

Screening for Incidence of Microsporidian Parasite Enterocytozoon hepatopenaei (EHP) in Litopenaeus vannamei from Aquaculture Ponds in SPSR Nellore District of Andhra Pradesh, India

“…Later, this parasite was identified in P. monodon and named as EHP by Tourtip et al, (2009). The occurrence of this parasite was reported in pond-reared P. monodon from Vietnam, China, Indonesia, Malaysia and Thailand (Ha et al, 2010) and in P. stylirostris from Brunei (Tang et al, 2015). EHP is also reported from slow growing shrimp in India (Sritunyalucksana el al., 2014) and very recently, its occurrence was reported in farm reared L. vannamei in India (Rajendran et al, 2016).…”

“…Previously Ha et al, (2010) had been reported that the association of microsporidian Enterocytozoon hepatopenaei with white faeces syndrome (WFS) and Felgel (2012) has indicated that severe infection with a microsporidian morphologically similar to E. hepatopenaei was associated with WFS of P. vannamei. In the present study WFS affected ponds showed low prevalence.…”

Identification and characterization of hybrids of Acipenser ruthenus and Acipenser baerii (Actinopterygii, Acipenseriformes) from the Irtysh River

“…Many researchers have often used the combination of the morphological and molecular methods to identify various species of aquatic organisms (Porto-Foresti et al 2013;Sales et al 2018;Ha et al 2018;Begum et al 2018;Jordan et al 2019) when the use of each of the methods separately cannot give an exact result in determining the species. For example, in the study of many species of freshwater copepods of the family Diaptomidae (Begum et al 2018), their taxonomic identification was difficult due to high morphological similarities and not significant differences in key characteristics among individuals of different genera.…”