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

摘要

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.