Open AccessFISH PRODUCTION AND COMMUNITY METABOLISM IN AN ORGANICALLY FERTILIZED FISH POND
Author(s) -
Behrends L. L.,
Kingsley J. B.,
Maddox J. J.,
Waddell E. L.
Publication year - 1983
Publication title -
journal of the world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0735-0147
DOI - 10.1111/j.1749-7345.1983.tb00103.x
Subject(s) - biology , zoology , standing crop , fish farming , primary production , common carp , fish kill , aquaculture , fishery , fish <actinopterygii> , agronomy , nutrient , ecology , ecosystem , biomass (ecology) , cyprinus , algal bloom , phytoplankton
ABSTRACT Fish production and community metabolism were monitored from March 1 to October 12, 1979, in an organically fertilized fish pond. Six hundred l/ha/min of warm water, simulating condenser cooling water from a steam‐electric power plant, was diverted into the pond to optimize fish production and lengthen the growing season. Liquid swine manure was added daily to the pond at a mean dry matter loading rate of 61 kg/ha/day. Two species of tilapia and 3 species of Asiatic carp were stocked at a combined density of 15,400/ha. In September, fish density was reduced to 6,625/ha. Net fish production after 213 days of culture was equivalent to 7,200 kg/ha. Community metabolism values (minimum‐maximum, mean) expressed as gO 2 /m 2 /day were: gross primary production (9.2–45.5, 22.1), net primary production (5.9–17.4, 10.4), and community respiration (8.2–46.6, 22.1). From June to September, a negative correlation existed between fish standing crop and primary production. Net primary production during afternoon hours averaged 32% less than production during morning hours. Seasonal and daily changes in primary production are discussed in relation to fish standing crop and fish grazing pressure.