Aluminium accumulation on eggs and hatching system during the incubation period - an important cause of variable hatching success ?
Working paper
Permanent lenke
http://hdl.handle.net/11250/103826Utgivelsesdato
1984Metadata
Vis full innførselSamlinger
Originalversjon
This report is not to be cited without prior reference to the authorsSammendrag
Groups of rainbow trout eggs were incubated in duplicate in
trays with PVC screens and original aluminium screens. During
incubation aluminium bound to sediments was deposited on eggs
and hatching systems. By adding acid the pH of the inlet water to a PVC hatching system
with sediments from the hatchery water in it, was experimentaly
lowered. Buffering of the outlet water was observed
from pH 5.0 and lower, and at pH 4.5 and lower an increase of
aluminium concentration in outlet water was measured. If a variable pH of the hatchery water is to be expected, the
aluminiumrich sediments deposited on eggs and hatching system
during incubation may represent a threat to the survival of eggs
and fry.