{"refrec":{"BRefID":134471,"RR":"<b>Braum, E.</b> (1985). Experiments on the respiration and <i>in situ</i> development of Baltic herring (<i>Clupea harengus</i> L.) eggs. <i>Int. Rev. gesamten Hydrobiol. 70(1)</i>: 87-100","BEntID":128398,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Int. Rev. gesamten Hydrobiol. 70(1)</i>: 87-100","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Braum, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Braum, E.","Englishabstract":"A primary blastodise develops 2 hours and 40 minutes after artifical fertilization at 8 °C and 15 %o S. The egg then begins embryonic development. When incubated in water with the oxygen concentration reduced to 50 % or 15 % saturation, the oxygen consumption of the eggs decreased to 73 % or 41 % of normal, respectively. For the <i>in situ</i> experiments, eggs and sperm taken from living fishes were spread on plexiglas plates in a way that monolayers adhered to the surface. The plates were then moored to buoys at two depths in a spawning area at Pötenitzer Wiek near Travemünde. Egg mortality increased with the duration of incubation. About 90 % of the spring spawn died before hatching, but only a 10 % mortality occurred among those spawned in autumn. Scanning electron microscope examination revealed structural changes on the egg surfaces caused by bacteria and particles of sediment. 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