Cephalopods breed in the near shore waters where the salinity fluctuations are more likely. Also, pollution from the adjoining industries is common in some of these areas. During the study, an attempt was made to find out the effect of salinity on the hatching of eggs of the bigfin squid, Sepioteuthis lessoniana. Embryonic development was found to be good at salinities 28ppt, 32ppt and 36ppt, while it was poor at 40ppt. No development was observed in 24ppt. Like wise, the effect of fly ash on the eggs of this species was tested at various concentrations in gram per liter of seawater. Mortality and premature hatching were observed at concentrations 25g, log, 5g, lg, 0.5g and O.lg. At 0.01g concentration, the hatching was normal but the hatchlings died within two days.

Effect of salinity and fly-ash, bigfin squid, Sepioteuthis lessoniana