Kai Lorkowski

Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research | AWI · Technology Transfer Office

Recirculating Aquaculture Systems (RAS) reduce water consumption by efficient filtration to maintain appropriate levels of accumulating compounds and sludge. Sludge is mechanically separated by drum filters and disposed of to the detriment of overall system water budgets. Dissolved nitrogen compounds are reduced via nitrification–denitrification fi...

Recirculation Aquaculture Systems (RAS) reduce water consumption but require costly filtering methods needed in order to maintain adequate levels of accumulating compounds, such as nitrogenous compounds and sludge. Sludge (faeces and waste diet) is mechanically removed by drum filters and settling systems and disposed of, while nitrogen compounds a...

Commercially viable aquaculture of noble crayfish Astacus astacus (Linnaeus, 1758), a once plentiful food species in Europe, requires production of suitable artificial diets for optimal growth in recirculating aquaculture systems (RAS). This technique provides the opportunity to culture this species in an enclosed ecosystem which minimizes the risk...

There is growing interest in using recirculating aquaculture systems (RAS) to produce juvenile noble crayfish, Astacus astacus (Linnaeus), a valuable and once plentiful food species in Europe, now a highly endangered species. The survival rates of early stripped eggs of A. astacus were compared across anti-fungal treatments in an artificial RAS inc...

There is growing interest in using recirculating aquaculture systems (RAS) to raise noble crayfish Astacus astacus a valuable and once plentiful food species in Europe, now a highly endangered species. The growth and survival of A. astacus was compared in growth trials in RAS and open-pond systems (OPS) over a period of 2 months. Energy and lipid c...

Introduction: Setting up a breeding and harvesting system for Nobel Crayfish Astacus astacus in a recirculating aquaculture unit requires investigation of technical and biological parameters. The food conversion ratio and growth induction of industrial carp diets was evaluated in feeding trials of 1-year old crayfish fed at various rations.

Hypothesis: As a benthic organism the noble crayfish (Astacus astacus) has specific requirements regarding the design of a Recirculation Aquaculture System (RAS) like multiple hiding places and a structured habitat. In this work a RAS was designed and evaluated containing coarse gravel as natural substrate. A backwash-system was installed into the...

Hypothesis: For setting up a breeding and harvesting system for Nobel Crayfish Astacus astacus in a recirculating aquaculture unit, technical and biological parameters must be investigated. Examining the growth rates of 1-year old crayfish while using various food batches should lead to different growth increments. Thus the optimal food conversion...