Publicaties | Kaarten

nieuwe zoekopdracht

[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina
Development of Baltic cod eggs at different levels of temperature and oxygen content
Wieland, K.; Waller, U.; Schnack, D. (1994). Development of Baltic cod eggs at different levels of temperature and oxygen content. Dana (Charlottenlund) 10: 163-177
In: Dana (Charlottenlund). Danish Institute for Fisheries and Marine Research: Charlottenlund. ISSN 0106-553X
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Aquatic organisms > Marine organisms > Fish > Marine fish
    Cells > Sexual cells > Eggs > Fish eggs
    Chemical elements > Nonmetals > Atmospheric gases > Oxygen > Dissolved gases > Dissolved oxygen
    Depletion > Oxygen depletion
    Environmental effects > Temperature effects
    Incubation
    Population functions > Mortality > Total mortality
    Profiles > Vertical profiles > Salinity profiles
    Gadus morhua Linnaeus, 1758 [WoRMS]
    Brak water
Auteurs  Top 
  • Wieland, K.
  • Waller, U.
  • Schnack, D.
Abstract
    The influence of ambient temperature (2-7° C) and oxygen level (1.0-8.3 ml/l) on the development of Baltic cod (Gadus morhua) eggs was investigated in laboratory experiments. The incubation period, i.e. the time from fertilization to 50% hatching, decreased from 27.5 days at 2° C to 13.0 days at 7° C. Reduced oxygen levels did not significantly affect the time of hatching. Throughout the incubation period highest mortality rates were found during gastrulation and immediately prior to hatching at all tested oxygen levels. Egg survival decreased from around 30% at an oxygen level of 8 ml/l to less than 10% at 2 ml/l oxygen content. At oxygen concentrations below 2 ml/O2/l the development ceased at a very early stage. Field observations revealed that in the past years Baltic cod eggs were most abundant below the halocline, depth with unfavourable oxygen condition. Besides the effect on egg survival, low environmental oxygen may also affect the initial viability of larvae and consequently their ability to approach the feeding areas close to the sea surface. Thus, the effective reproduction volume of water for cod in the Central Baltic may have been smaller than expected and it is suggested that oxygen depletion was the limiting factor determining the reproductive success of cod in this area during the last decade.
Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs 
IMIS is ontwikkeld en wordt gehost door het VLIZ.