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Empirical Estimates of Potential Fish Yield for the Lake Bangweulu System, Zambia, Central Africa
Author(s) -
Toews D. R.,
Griffith J. S.
Publication year - 1979
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(1979)108<241:eeopfy>2.0.co;2
Subject(s) - yield (engineering) , fish <actinopterygii> , fishery , environmental science , geography , biology , metallurgy , materials science
Estimates of potential fish yield derived for the Lake Bangweulu system by three independent methods varied from 10 to 35 kg/hectare. An estimate of 20 kg/hectare predicted by the regression of yield on morphoedaphic index (MEI) for 31 African lakes is in good agreement with the 1973–1974 estimated yield of 19 kg/hectare. Potential yield was 35 kg/hectare in the morphoedaphic model for 17 intensively exploited African lakes. Potential yield based on primary production covariates was 16 kg/hectare. Standing crop estimates indicated possible yields of 10 to 17 kg/hectare based on 100% and 60% sampling recovery, respectively, of fish from chemical treatment samples and a 50% annual exploitation rate.