Abstract
Yield trial experiments were conducted in 10.5 m 2 plastic-lined pools to test liquid swine manure as an organic fertilizer for fish production. Silver carp ( Hypophthalmichthys molitrix), bighead carp ( Aristichthys nobilis), and tilapia ( Tilapia nilotica) were cultured together for 52 days during August and September 1977 to determine growth and yield responses to various manure fertilization treatments. Net fish yields were 1.8 times greater in pools receiving direct manure fertilization than in pools receiving phytoplankton slurries produced with comparable amounts of manure. Early morning dissolved oxygen concentrations became critical (<1 ppm) when direct manure fertilization exceeded 4 l pool −1 day −1.
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