The influence of processing and temperature conditions on hatching of resting eggs of Streptocephalus proboscideus (Crustacea:Branchiopoda:Anostraca)

摘要: In large freshwater branchiopods, erratic hatching success of resting eggs is a major obstacle to various applications. Lack knowledge the diapause-regulating processes makes control difficult. Sudanese fairy shrimp Streptocephalus proboscideus cysts are considered include diapausing and quiescent fraction. To effect hatching, have be activated, while portion has triggered by suitable environmental conditions. Of several attempts with varying production, processing, incubation conditions, only few treatments proved consistently successful. Cysts were produced in an indoor culture system under controlled conditions harvested, washed, dried according defined procedures before processing (if any) incubation. Hatchability (first-day cumulative) was higher chemically decapsulated than untreated (non-decapsulated) at 25 °C. At temperature 28 °C, comparable significantly Pre-treatment 7.5% NaOCl for 5–10 minutes, resulted other decapsulation durations. It believed that effective triggering but did not activate