The highest head weight and yield of lettuce were observed with plants grown on the sand media
followed
by gravel and the control treatments.
Partially filtered pond water treatments had significantly
higher lettuce yield (P < 0.05) and filtration increased lettuce yield of the control, gravel and sand treatments
by 87, 63 and 52%, respectively, over unfiltered water treatments. Lettuce grown on gravel and
the filtered water control treatments had adequate tissue N content. Nutrient rich hybrid catfish (Clarias
macrocephalus × Clarias gariepinus) pond water provides an opportunity to use it in the hydroponic
vegetable production.