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Inken Hanke

Institution: Leibniz Center for Tropical Marine Ecology (ZMT), Bremen
Room: ZMT, room 2121
Phone: +49 421 23800 - 84
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Other webpage(s): Inken's ZMT web page
Inken Hanke

PhD project:

Ecophysiology of selected aquaculture species in Indonesiaand the Philippines

Global Aquaculture fish production is rapidly expanding in the last decades due to an increasing demand of fish products. This development can be seen particularly in South-East Asian countries, which belong to the top producers in the global aquaculture industry. Due to the growing aquaculture production in South-East Asian countries, assessments of the ecological threats caused by aquaculture practices, especially in coastal areas, become increasingly important. Culturing practices or strategies involving overfeeding and overstocking are main causes of ecological interferences, such as eutrophication. The impact of these culturing practices on the stocked fish, consequently the actual product, is of great interest for both scientific and commercial aspects.

This PhD-project is part of a multi-disciplinary approach, cooperating with eco-physiologists, microbiologists and biogeochemists with the overall goal to assess the impact of effluents from maricultures (sea cages/ pens) on tropical coastal ecosystem in the Philippines and Indonesia, including environmental impacts as well as aspects concerning the condition of farmed fish.

My PhD-Project will focus on the stress physiology of cultured fish. To evaluate the stress response of cultured fish species the metabolic performance and antioxidant defense of fish under the influence of certain stressors will be examined through respirometer measurements of oxygen consumption and by analyzing specific marker (enzymes) involved in the metabolism/antioxidant defense. Furthermore, fish from different mariculture systems will be examined for indications of chronic stress. Additionally, my PhD-Project will focus on strategies to minimize or “re-use” excessively nutrient outputs from aquaculture systems with an integrated multi-trophic aquaculture (IMTA) approach by combining cultures of nutrient releasing organisms with cultures of filter feeding/ nutrient up-taking organisms.

Thesis committee:

Dr. Astrid GärdesLeibniz Center for Tropical Marine Ecology (ZMT) Bremen
Dr. Andreas KunzmannLeibniz Center for Tropical Marine Ecology (ZMT) Bremen
Prof. Dr. Ulrich Saint-PaulUniversity of Bremen and Leibniz Center for Tropical Marine Ecology (ZMT) Bremen
GLOMAR Research Theme C