THE APPLICATION OF BASALTIC TUFFS IN THE TECHNOLOGY OF CULTIVATION THE LIVE FEED FOR FISH – PRELIMINARY STUDY

Abstract

The research work is meant to investigate the possibility of using the zeolite-containing tuffs in  the  technology  of  live  fish  feed  cultivation  by  example  of  Cladocera. It  is  shown  that the  use  of natural  and  treated  at  the  temperature  of  150°C  basaltic  tuffs  from  „Polytske-2”  basalt  deposit during Moina macrocopa cultivation leads to  an increase of the culture density by 2 and 2.3 times, respectively. In the experiment with Simocephalus vetulus the increase of culture density has not been found, however basaltic tuffs allow to stabilize the culture growth and slow its extinction rate. Besides, it  is  observed  the  effective  purification  of  cultural  medium  of  dissolved nitrogen  forms  probably  by adsorption. The use of basaltic tuffs, calcined at a temperature of 1000 °C, leads to the death of M. macrocopa and S. vetulus cultures in 6 days. This circumstance makes the  use of calcined tuffs impractical.