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Food competition between 2+ tench ( Tinca tinca L.), common carp ( Cyprinus carpio L.) and bigmouth buffalo ( Ictiobus cyprinellus Val.) in pond polyculture
Author(s) -
Adámek Z.,
Sukop I.,
Rendón P. Moreno,
Kouřil J.
Publication year - 2003
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1046/j.1439-0426.2003.00467.x
Subject(s) - polyculture , cyprinus , biology , stocking , common carp , carp , zoology , fishery , detritus , zooplankton , competition (biology) , aquaculture , ecology , fish <actinopterygii>
Summary Natural diets of tench ( Tinca tinca L.), carp ( Cyprinus carpio L.) and bigmouth buffalo ( Ictiobus cyprinellus Val.) were studied to determine food competition among them in polyculture stocks of two different densities. Tench diet consisted mainly of zooplankton (43.8%) and bottom sediments (21.2%). In contrast, carp diet consisted mainly of bottom items including plant debris and detritus (68.8%), which dominated over zooplankton (19.1%). In bigmouth buffalo, most food bulk comprised zooplankton (80.7%). Thus, the resulting food competition (i.e. similarity) was most pronounced between tench and carp (60.8%) and between tench and bigmouth buffalo (47.4%). When comparing growth performance of the three cultured species, the ratios between stocking and harvesting size were: in normal stocking density (392 kg ha −1 ) 1.72, 3.67 and 2.13, and in doubled stocking density (777 kg ha −1 ) 1.07, 2.33 and 2.16 in tench, carp and bigmouth buffalo, respectively.