Johannes PUCHER, Tuan Nguyen NGOC, Trinh THİHANHYEN, Richard MAYRHOFER, Mansour EL- MATBOULİ, Ulfert FOCKEN

Earthworm meal as fishmeal replacement in plant based feeds for common carp in semi - intensive aquaculture in rural northern vietnam

It was evaluated whether earthworm meal can fully replace fishmeal in supplemental feeds for common carp (Cyprinus carpio ) that also feed on natural food resources in semi-intensive aquaculture. A net cage trial (32 nets) was carried out using three iso -nitrogenous feeds fed to common carp either at a level of 10 g/kg 0.8 metabolic body mass (5 fish per cage) or 20 g/kg0.8 metabolic body mass (10 fish per cage). In feeds, fishmeal protein was replaced by 0 %, 50 % or 100 % of protein from sun dried earthworms (Perionyx excavatus). At both stocking densities, control groups of fish fed only on natural food resources. The growth rate of fish increased with rising replacement of fishmeal by earthworm meal at both feeding rates. Large zooplankton were the predominant natural fo od resource. With increasing availability of large zooplankton, sun dried earthworm meal in plant-based supplemental feeds seemed better able to meet the nutritional requirements of common carp than fishmeal. Integration of earthworm production ( vermin culture) into small-scale farms in developing countries may open the possibility for farmers in rural areas to engage in semi-intensive aquaculture by using earthworms as a feed ingredient in supplemental feeds for common carp.

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