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Catchability and Stock Density of Common Carp, Cyprinus carpio L. in a Lake Fishery
Author(s) -
Linfield R.S.J.
Publication year - 1980
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1980.tb00277.x
Subject(s) - cyprinus , biology , fishery , common carp , carp , stock (firearms) , fish <actinopterygii> , engineering , mechanical engineering
The methods adopted for a tag‐recapture study on the carp population in a South Lancashire lake are described. Fifty‐three percent of carp tagged were recaptured on at least one occasion. Catch frequency data from angling were not observed to deviate significantly from Poisson probabilities indicating that, within any one angling year, the first‐capture experience of a carp did not significantly decrease the risk of its further capture. These findings differ from those of Beukema (1970) with carp in experimental ponds and a possible reason for the difference is suggested. The total population of adult carp in the lake (± standard error) was estimated in 1972 as 452 ± 32 with a corresponding biomass of 1307.44 ± 93.10 kg, or approximately 380.07 ± 27.06 kg per hectare. In the first three weeks of the 1972/73 angling season the rate of exploitation by angling was 32.6%.