TY JOUR TI DYNAMICS OF THE STRUCTURE OF SPAWNING TUGUN STOCK IN THE SEVERNAYA SOSVA RIVER KW spawning stock KW generation KW size-age structure KW fertility JO Vestnik of Astrakhan State Technical University. Series: Fishing industry AU Melnichenko, I.. AU Bogdanov, V.. PY 2012 IS 2012 PB Astrakhan State Technical University