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Increasing Fish Production in Ponds
Author(s) -
Yashouv A.
Publication year - 1963
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1963)92[292:ifpip]2.0.co;2
Subject(s) - carp , cyprinus , human fertilization , plankton , phosphorus , productivity , zoology , fish farming , biology , biomass (ecology) , common carp , fishery , fish <actinopterygii> , abundance (ecology) , tilapia , environmental science , agronomy , aquaculture , chemistry , macroeconomics , organic chemistry , economics
Yields of carp (Cyprinus carpio) as high as 800‐1,200 pounds per acre were secured when fish culture was initiated in Israel in 1938‐39, but production has been increased three‐ to fourfold in recent years. Good, rich, water quality and annual growing seasons of 270 days permit such yields. Biweekly fertilization to provide 2 p.p.m. nitrogen and 0.5 p.p.m. phosphorus increased carrying capacity fourfold, and daily production almost tenfold. Fertilization does not increase plankton biomass or fish production proportionately, nor does it maintain plankton at a constant high level of abundance. Increased rates of fertilization do not increase primary production over a level controlled by density‐dependent factors. Greater utilization of the productivity is secured by using carp and Tilapia nilotica, rather than just carp. Accumulation of metabolic wastes may be an important density‐dependent factor controlling fish growth.