Growth testing of two breeds of common carp, Cyprinus carpio L. (Hungarian mirror and Třeboň scaly carp), in ponds with low and high stocking density

Abstract

The growth of two breeds of common carp, Cyprinus carpio L., was tested in ponds under the climatic conditions of South Bohemia. Tr› ebon› scaly carp (TR) and Hungarian mirror carp (M2) were kept in both low and high stocking densities during the second growing season and then stocked together for communal testing during the third growing season. Before the communal testing, the mean initial weights of ¢sh from low-and high-density stocks di¡ered signi¢cantly (374.1 vs. 227.7 g for the TR breed and 766.7 vs. 317.3 g for the M2 breed respectively, Po0.01). After communal testing, mean weights of ¢sh from low-and high-density stocks gained 761.8 vs. 543.8 g for the TR breed and 1339.7 vs. 706.7 g for the M2 breed respectively. These observed weights were also signi¢cantly di¡erent (Po0.01). However, the test of corrected weight gain, i.e. gain not related to the initial weight of ¢sh, revealed insigni¢cant di¡erences (P40.01) between the weight gains after correction, i.e. the e¡ect of di¡erent initial weights was successfully eliminated. These results seem to con¢rm the applicability of this method for the assessment of growth of purebred common carp under the climatic conditions of Central European ¢sh farms.The lower index indicates age of the ¢sh; Then TR 1 À 2 means Tr› ebon› scaly carp in growing season 2, etc.Aquaculture Research, 2003 Growth testing of common carp P Hartvich et al.

Natural diet of mirror and scaly carp (Cyprinus carpio) phenotypes in earth ponds

“…These results suggest that these two carp phenotypes should not be cultured together in high densities as the high value of diet overlap suggests high competition for food (Schoener 1970, Wallace 1981. Hartvich et al (2003) studied the growth of these two phenotypes when cultured together and observed that there were no significant differences in weight gain between mirror and scaly carp. They concluded that both phenotypes have similar genetic potential to grow in ponds.…”

Evaluation of growth and dressing out parameters of experimental scaly crossbreds in 3-year-old common carp (Cyprinus carpio, Linnaeus 1758)

“…In experiments performed in the Institute, methods of genome manipulations and selection are used, as well as various types of hybridization crossbreeding (top, diallel, reproductive, combinative) intended to improve ¢sh performance. A large number of papers (Gela & Linhart 2000;Linhart, Gela, Rodina, Sï lechtova Ł & Sï lechta 2002;Gela, Rodina & Linhart 2003;Hartvich, Flajsfl hans, Ny Ł dl, Vondra & Pavl|¤ cfl ek 2003;Kocour, Gela, Rodina & Linhart 2005) testify to the intensity of research activity of the Institute in respect to comparison of performance in various crossbred groups. Overall, the results show that there exist signi¢cant di¡erences in growth performance, survival as well as dressing out parameters among the tested groups.…”

Evaluation of the Dressing Percentage of 3-year-old Experimental Scaly Crossbreds of the Common Carp (Cyprinus carpio, Linnaeus 1758) in Relation to Sex

“…In experiments performed on the facilities, various types of hybridization crossing (Gela and Linhart 2000;Linhart et al 2002;Hartvich et al 2003;Kocour et al 2003;Kocour et al 2005ab), genome manipulations (Flaj‰hans et al 1993ab;Flaj‰hans 1997;Flaj‰hans and Linhart 2000), and, in some cases, selection methods are used to improve yield variables of fish. These methods of breeding are not generally successful in carp because their growth patterns are not affected by the additive effects of genes (Moav and Wohlfarth 1976).…”