Nghiên cứu sự thành thục sinh sản của cá ong bầu (<i>Rhynchopetaltes oxyrhynchus</i> Temminck & Schlegel, 1842) trong ao nuôi lót bạt

Abstract

The sharpbeak terapon (Rhynchopelates oxyrhynchus) is a potential species for aquaculture in Thua Thien Hue province. However, data related to the maturation of this species in ponds have not been investigated. This study aims to evaluate the maturation of sharpbeak terapon cultured in HDPE ponds to manipulate the maturation of broodstocks for artificial based on changes in the gonadal somatic index (GSI), oocyte diameter, and vitellogenin concentration in female fish, as well as gonadal maturation in male fish. The study results showed that broodstock conditioning culture of sharpbeak terapon can be conducted successfully in HDPE ponds with a survival rate reaching about 60%. During the study period, the highest GSI of females and males was 5.30% and 3.56% respectively. Plasma Vtg concentration gradually increased from 102.0 ng/mL in January to the highest value of 765.9 ng/mL in August. Based on the histological assessment of gonads, the gonadal development of female sharpbeak terapon was at the early vitellogenic stage in July. The maturation stage occurred from August to September with oocyte diameter reaching more than 400 µm.

Keywords: sharpbeak terapon, vitellogenin, maturation