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Journal of Biological Sciences
Year: 2006  |  Volume: 6  |  Issue: 6  |  Page No.: 1103 - 1107

Effect of Salinity on Larval Development and Survival of the Caspian Sea Barnacle, Balanus improvisus Darwin (1854)

Ali Nasrolahi, Farzane Farahani and Sayed Jafar Saifabadi    

Abstract: The effect of salinity on larval stage and survival of B. improvisus was evaluated under controlled laboratory conditions. This study is carried out for the first time on the Caspian Sea B. improvisus population. Larvae were provided using egg lamella at later development stage. Hatch nauplii were mass reared in 0.6 L glass beakers(1 larva per 2 mL) on a different salinity and daily monoalgal diet (Chaetoceros calcitrans) at 21x105 cells per mL, under continuous light at 25°C (±1). The majority of nauplius II larvae in 8-25‰ range, completed the life cycle to cypris stage after 7 days. But larval size was decreased with increase salinity. Larvae that held in beakers at 7 and 28‰, completed life cycle after 8 days and about 36‰, was gained 9 days. With increase salinity from 12 due to 36‰, survival was decreased. Larval survival was highest in 12‰ (66%) and lowest in 36‰ (14%).

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