Einflüsse des Managements und äußerer Haltungsbedingungen auf den Afrikanischen Raubwels Clarias gariepinus (Burchell, 1822) in Kreislaufanlagen (RAS)

Autor: Hildebrand M.-C. 2025
Herausgeber: Universität Rostock
Urheber: Zoologie
Ort: Rostock
Verlag: Professur für Aquakultur und Sea-Ranching

Einordung:
Institut: Professur Aquakultur und Sea-Ranching

Abstract:
With the increasing demand for fishery and aquaculture products in the world, the
production of these goods is also generally expanding. For the aquaculture-relevant
species Clarias gariepinus, rearing and grow-out conditions under near-industrial
settings were evaluated and improved based on scientific studies. Moreover, the use
of this fish species in a sustainable aquaponics system offers further advantages. The
optimization of this synergetic relationship between fish and plants through special
micronutrient fertilizers was further progressed through this work.
The results showed that different stocking densities during rearing and grow-out
phases of C. gariepinus are variably beneficial depending on the growth stage. The
fish could successfully be conditioned to new feeding times through light
management, improving feed intake without increasing stress indicators such as
cortisol. Warm light colors promoted better body condition and activity, while blue
light components triggered stress reactions. The fish also showed high sensitivity to
sound and vibrations. The influence of chemical micronutrient fertilizers (Zn-EDTA
and Fe-DTPA) in process water indicated that plant-relevant concentrations are
unproblematic. However, a dilution ratio of 1:4 is recommended for juvenile fish
during the rearing phase.

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