Induced spawning of Asian bumblebee catfish (Pseudomystus siamensis Regan, 1913)

Asian bumblebee catfish (Pseudomystus siamensis Regan, 1913) is an indigenous and economically valuable species in southern provinces of Vietnam. It is being exploited for food and ornamentation. This study used fish pituitary gland (FPG), human chorionic gonadotropin (HCG) and luteinizing hormone releasing hormone analogue (LHRHa) to induce spawning of the fish. The three spawning inducers affected on final oocyte maturation (FOM) and ovulation (FOMO) of females. The optimal revolving dose to induce FOM and FOMO was 10 mg/kg for FPG, 4.000 UI/kg for HCG and 120 μg/kg of female for LHRHa. The suitable periods of egg stripping and artificial insemination were from 9 - 11 h post resolving injection (hpri). Maximum spawning response was obtained with the optimal revolving dose of LHRHa (120 μg/kg). At the suitable stripping period (10 hpri) the rates of spawning, egg fertilization, egg hatching, larval survival, and relative fecundity were 64.5%, 70%, 44.5%, 39.3%, and 38,500 egg/kg of female, respectively.