Egg survival

Physa gyrina 26 Reduction in number of egg masses produced and in egg survival during lifetime exposure 4, 10, 70... 

The percentage of survivorship was estimated from 25 years worth of data from the collections at 2.56087E-05 only 0.0000256 of the eggs survived to become age 2. Survivorship from egg to age 2 was considered to be constant for each age class of fish. 

Oxygen dynamics in the deepwater of the central Baltic Sea is a key issue for the cod reproduction in the Baltic. The recruitment of cod depends on egg survival within the halocline, implying that hypoxia or anoxic condition can significantly decline the number of recruits. The ventilation of the deepwater below the halocline is associated with saltwater inflows, but oxygen consumption is mainly due to mineralization of detritus. 

A percentage of the transplanted eggs survive to full term and are delivered either naturally or by Caesarean section (section 13). 

Measures of effects Effects of low dissolved-oxygen concentrations on fish eggs and fry effects of obstacles snch as dams on adult fish behavior and effects of bottom sediment in streams on spawning behavior and egg survival... 

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