10 documents found

Dissertation

Potential and limitations of ozone in marine recirculating aquaculture...

The aim of the present thesis was to assess the potential and limitations of ozonation in marine recirculating aquaculture systems (RAS) while particularly focussing on the toxicity, formation and removal of ozone-produced oxidants (OPO) in order to develop guidelines and thresholds for a reasonable...
Dissertation

Comparative population genetics, larval dispersal and evolutionary aspects...

In this thesis, population genetic structures and evolutionary aspects of speciation in notothenioid fishes from the Southern Ocean have been investigated. Special emphasis was given to the role of pelagic larval dispersal on gene flow between geographically separated populations, since notothenioids...
Dissertation

Factors challenging the European eel (Anguilla anguilla) stock recovery...

In the present thesis, it was for the first time possible to directly assess the entire silver eel escapement from a medium freshwater system in Northern Germany (Schwentine river system) over a 3-year period (Chapter I). The rare possibility to document the complete escapement of silver eels out of...
Dissertation

Monitoring of parasite and virus infections of the European eel, Anguilla...

The aim of this thesis was to examine metazoan parasite communities and viral infections of European eel, Anguilla anguilla, from fresh water, brackish and marine localities in northern Germany. The here collected data shall help to evaluate the suitability of the studied localities for potential restocking...
Dissertation

Biogeographic patterns of the marine bivalve Cerastoderma edule along the...

The cockle Cerastoderma edule is a common bivalve that inhabits the marine soft-bottom intertidal along European shores. This invertebrate plays a key role in coastal food webs of the Northeast Atlantic coasts due of its high abundances. I studied cockles from 19 sites along the distribution range with...
Dissertation

Influence of temperature and salinity on sprat (Sprattus sprattus) eggs...

The present thesis investigated the effects of manipulated temperature (range from 5-19°C) and salinity (range from 5-37.2) levels on survival, egg buoyancy, growth, developmental durations and important morphological traits of eggs and non-feeding yolk sac stages of sprat (Sprattus sprattus) originating...
Dissertation

Research into the early life history Of Atlantic salmon with focus on practical...

The widespread decline of anadromous Atlantic salmon (Salmo salar L.) populations makes it imperative to research the underlying cause and to develop mitigation measures. One of the most vulnerable phases in the life-cycle of salmon is the fry stage in early spring. Survival rates of juveniles emerging...
Dissertation

Microchemical analyses of otoliths in Baltic Sea fish - Possibilities and...

In this thesis otolith microchemistry analyses were used to gain insights into the individual life history and stock characteristics of three fish species from the Baltic Sea - the European eel Anguilla anguilla, the Atlantic cod Gadus morhua and the thicklip grey mullet Chelon labrosus. The special...
Dissertation

Persistent organic pollutants in fish - improving threshold values for...

Since 2008, the Marine Strategy Framework Directive (MSFD) has coordinated the monitoring and integrated assessment in European marine waters in order to protect marine ecosystems and simultaneously guarantee the sustainable use of marine goods and services. So far, many progresses have been made to...
Dissertation

Chronic stress in fish - Investigation of the cellular response to persistent...

For finfish, coping with stress is not only relevant in the context of ecology but has also garnered lots of attention with respect to animal welfare in aquaculture. Yet, In particular the response to chronic stress still raises many questions regarding regulatory dynamics and mechanisms. I investigated...