Abstract
The common carp (Cyprinus carpio L.) is the most important fish species in Hungary, it is more than 70% of the total Hungarian fish production. The common carp production is important not only just in Hungary but in Middle-East Europe, as well as Southeast Asia. Majority of the production comes from fishpond culture. If the production sector wants to meet the increasing customer demands, there is need to intensify research on the intensive fish production opportunities for example all-female common carp technologies. The all-female technology is one of a genom-manipulation technology. Its production showed better growth rate than mixed-sex population in pond culture. Our experiment combined the recirculation aquaculture system (RAS) and the all-female common carp stocks intensification technologies. The reason for the experiment, is that there are no result about the growth of all-female common carp growth in RAS. 
 The experiment used the „Tatai grey scale type” common carp stocks. We propagated two all-female stocks (T2 and T3) and a control group (TK). Due to technological characteristics of RAS, the water quality parameters were the same for all treatments and corresponded to the technological tolerance of common carp.
 The experimental period was from July 10, 2019 – November 20, 2019. Result of growth performance showed that the growth of mixed-sex stock was significantly higher than all-female stocks; (Control=3692.0±590.5g, T2=3438.8±415.4g, T3=3294.1±659.1g). Feed conversation ratio (Control=1.3±0.1 T2=1.5±0.2 T3=1.6±0.5) and SGR% (Control=0.8±0.0 T2=0.7±0.1 T3=0.7±0.1) were similar. 
 By the results it can be said the all-female common carp technology has neither advantages nor disadvantages compared to the mixed-sex stock. The all-female technology can be beneficial if the consumers need female common carps. It is worth continuing the experiment and examine how the stocks will perform above 3kg body weight.
Highlights
Common carp (Cyprinus carpio L.) is the most important fish species in Hungary, representing more than 70% of the country’s fish production (FAO, 2019)
We examined the all-female and mixed-sex common carp growth performance in recirculation aquaculture system (RAS)
To examine the growth rate of the fish, the SGR% specific growth rate - SGR% = / t x 100, Wf refers to the final body weight (g), Wi stands for the initial body weight (g), and t indicates the number of days
Summary
Common carp (Cyprinus carpio L.) is the most important fish species in Hungary, representing more than 70% of the country’s fish production (FAO, 2019). One of genom-manipulation technology is the allfemale or all-male stocks propagation. It has many advantages, such a better reproduction, increased growth rate, more uniform stocks which can be advantageous for fish processing (Kocour et al, 2005). All-female technology is developed based on which sex has growth rate for the particular fish species. All-female and mixed-sex growth performance of some species (Nile tilapia, Amur catfish (Silurus asotus) have been examined (Dan et al, 2000). When the all-female common carp stocks became mature the differences of the mixed-sex stock will be disappear (Hulata et al, 1985)
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