renowned lecturers in-between: Dr. Stefan K. Hetz ("In good company: Temporal, locational and behavioral aspects of a community aquarium"), graduate biologist Frank Schäfer ("Air breathing fish"), Dr. Helmut Wedekind ("Animal welfare in fishkeeping: Evaluation and relevance for aquarium care") and Prof. Dr. Christian E.W. Steinberg ("Soil components (humic substances, biochar, clay) in the food…
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