Cold storage af copepode æg

René Mathiassen

Studenteropgave: Speciale


With an increased aquaculture it will be possible to help solve a global food shortage with an increasing population growth. The problem with aquaculture is that some fish species need live food, which at the same time will provide quality that can give a healthy aquaculture. Here are copepods, acartia tonsa, a good choice as it is a natural food choice for some fish larvae and they have a good fatty acid component. Copepods, acartia tonsa also has the advantage that their eggs can come in a state of “quiescence” Quiescence is a natural state that occurs when environmental conditions are unfavorable. The advantage of quiescence is that it is possible to change the environmental conditions to favorable conditions and restart the eggs development and thereby hatch them. Several experiences with quiescence eggs have over time shown that the hatchling rate has fallen. This project examined whether a stable pH value controlled with a boric acid and borax buffer can increase the hatchling rate over time. In addition, it will also be examined if the starting oxygen content has a meaning for the hatcling rate over time. It has been studied whether the bacterial conditions was affected by the buffer, and different initial oxygen conditions. As copepod eggs can be in a quiescence state for several years in nature, some of the samples were made with extra organic matter surrounding the eggs. It turns out that additional organic matter has a positive effect for the hatchling. The project has shown that boric acid and borax buffer is not the right type of buffer.

UddannelserMiljøbiologi, (Bachelor/kandidatuddannelse) Kandidat
Udgivelsesdato29 apr. 2016
VejledereBenni Winding Hansen


  • copepode