The summer bakhtak is smaller (<50 cm), and breeds naturally  both in rivers and within lake near river mouths.
ðə sˈʌmɚ bˈækhtæk ɪz smˈɔːlɚ fˈɪfti sˌiːˈɛm, ænd bɹˈiːdz nˈætʃɚɹəli bˈoʊθ ɪn ɹˈɪvɚz ænd wɪðˌɪn lˈeɪk nˌɪɹ ɹˈɪvɚ mˈaʊðz.