Abstract: The effects of various salinities(20,25,30,32,35,and 40)on fertility,hatching rate,survival,and metamorphosis were studied in predominant fouling organism Hydroides ezoensis larvae.It was found that there was high fertility in the eggs exposed to the salinities in the experiment,the maximal fertility(96.67%±1.76%)at a salinity of 35,and the minimum(82.23%±1.85%)at a salinity of 20,significantly lower than that at other salinities(P＜0.05).The hatching rate was affected by the salinity,the maximal hatching rate(85.68%±1.20%)at a salinity of 32 and the minimal(62.03%±3.78%)at a salinity of 20,significantly lower than that at other salinities(P＜0.05).The higher survival and metamorphic rates were found at a salinity from 25 to 35,the maximum(72.14%±3.04%in survival rate and 63.45%±2.13%in metamorphic rate)at a salinity of 32,and the minimum(10.82%±1.76%,and 5.21%±1.40%)at a salinity of 40,significantly lower than that at other salinities(P＜0.05),except at a salinity of 20.The findings indicate that the adaptive salinity is varied from 30 to 35 for fertility,hatching rate,survival,and metamorphosis in Hydroides ezoensis larvae,35 for the maximal fertility,and 32 for the maximal hatching,survival,and metamorphic rates.
2013, Vol. 28 
