The effect of ambient salinity on the buoyancy of eggs from the Atlantic halibut (Hippoglossus hippoglossus)
Original version
This report is not to be cited without prior reference to the authorsAbstract
The effect of ambient salinity on buoyancy and the formation of
perivitelline fluid in eggs from the Atlantic halibut Hippoglossus
hippoglossus have been investigated. The results clearly demonstrate
that the water balance of the eggs are independant of the
ambient salinity the first days after fertilization. The water
loss from eggs fertilized in 17 ppt saline sea water was not less
than from eggs fertilized in 34 ppt sea water in spite of a reduced
osmotic gradient. Neither was the egg buoyancy altered by fertilization
in low saline sea water. For proper fertilization, the
eggs from the Atlantic halibut need concentrations of calcium near
the concentration found in sea water.