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

Abstract

The aim of the present study was to compare dressing percentages, with relation to sex, of three bisexual groups of hybrid carp, i.e. Hungarian mirror carp and Northern mirror carp (M2 × M72), the hybrid line of Pfierov scaly carp and Northern mirror carp (PS × M72), the hybrid line of Pfierov scaly carp and Ropsha scaly carp (PS × ROP), and the pure line of Pfierov scaly carp (PS) in harvest size (K 3 ). There were practically no differences in growth variables of male and female carp between the pure line PS carp and M2 × M72 and PS × ROP hybrids. Statistically significant differences in some variables between sexes were found in the scaly hybrid line PS × M72. Females in that group had significantly higher growth rates (TL and SL by 4.08% and 4.52%, respectively; p < 0.05), and their weight variables were also higher (FW, CW and FilletW abs by 11.37%, 13.70% and 14.83%, respectively; p < 0.05 and p < 0.01). The weight of gonads of male carp from all the groups studied was significantly higher (p < 0.01) than that of ovaries of female carp (or, rather, the GSI of male carp was higher).

Amino acid composition of edible parts of three-year-old experimental scaly crossbreds of common carp (Cyprinus carpio, Linnaeus 1758)

“…The same levels of AA in hard roes of experimental female fish (PS, PS × M72, PS × ROP) and hard roes of control hybrid females M2 × M72 were found in three cases only (Arg, Ser, Glu). The reason for differences the frequently found in the content of other AA in hard roes probably lies in the different stages of their gonadogenesis, which are related to proven differences in growth capabilities between the groups of carp studied, and the differences in the weight of hard roes and the GSI♀ value (Buchtová et al 2006a, b). It was interesting to note that roes of experimental female carp (PS, PS × M72, PS × ROP) contained, besides the non‐essential Glu, mainly Val, whereas hard roes of control female carp (M2 × M72) contained, besides Glu, mainly Gly.…”

“…The authors have demonstrated the existence of statistically significant differences in the quantitative representation of certain AA in edible parts of the common carp depending on the type of hybrid and line ( P <0.05 and P <0.01 respectively), which may be related to changes in their specific genetic information. In view of the demonstrated differences in biometric and weight parameters between the groups of carp studied (Buchtová et al 2006a, b), it is feasible to assume that different nutrition requirements of the fish and different utilization of nutrients received in the diet contributed to the differences in the levels of individual AA found. Even in the same environment and under the same feeding regime, the nutritional requirements of fish of the same age are influenced by their size and degree of sex maturity (Jobling 1994).…”

“…The largest number of sex‐related differences in quantitative representation of AA in muscle tissues were found in the slowest‐growing pure line of PS carp, although there were practically no differences in the biometric parameters and final weight between PS males and females (Buchtová et al 2006b) (Table 2).…”

“…Laboratory tests of the quantitative and qualitative composition of AA were performed in 40 carp: 10 of each line (5♀+5♂) from the pond Jaroslav. Fish from this pond showed the best results in efficiency tests (Buchtová et al 2006a, b). The determination of the quantitative and qualitative composition of AA was performed using HPLC.…”

“…In our experiment, individual groups of carp monitored differed in genome composition. The experimental scaly carp hybrid Přerov scaly carp and Ropsha scaly carp (PS × ROP), which showed the best yield values in the growth tests performed (Buchtová, Svobodová, Kocour & Velíšek 2006a, b) and is considered to be a promising hybrid from the commercial fish farming point of view, was produced from two genetically very distant lines of the common carp (Pokorný, Flajšhans, Hartvich, Kvasnička & Pružina 1995).…”