THE EFFECTS OF ADMINISTERING ZEOLITES ON GROWTH PERFORMANCES IN A JUVENILE CARP POLYCULTURE (Cyprinus carpio) WITH SILVER CARP (Hypophthalmichthys molitrix) AND BIGHEAD CARP (Hypophthalmichthys nobilis)

Veta Nistor, C. Savin, Magdalena Tenciu, Elena Eugenia Mocanu, V.O. Eşanu

Abstract
    Volcanic tuffs contain a type of minerals, called zeolites, that function as "molecular sifts" in the treatment of wastewater.
    This study evaluated the influence of zeolite administration on carp brood growth in the 1st summer, it increased in polyculture with Silver Carp and Bighead Carp. The results have shown that the use of zeolite has slightly influenced the soil and water quality and has resulted in a better assimilation of feed in basin B2 than in control B1. The overall growth rate was higher in B2 than in B1 (2.346 kg versus 2.226 kg). Biological material has grown normally, without the development of pathological conditions that could influence the conduct of the experiment. The physical-chemical parameters of the water, with few exceptions, fell within the optimal range for carp growth.
    Implementing this method of natural zeolite filtering would improve fish microclimate factors and increase the production of fish biomass and would obtain production increases in ecological conditions, and ensure the quality of technological water and stimulate better food assimilation.
    Trough the application of carp growth technology (Cyprinus carpio) in summer I in polyculture using zeolites involved the administration of organic fertilizers, the use of fodder as close to ecological standards as possible and the use of zeolites to ensure the quality of technological water as to stimulate better food assimilation.
    The real growth gain in experiments had the highest value in B2 (conventional technology and zeolite utilization) with 2.346 kg / ha followed by B1 (conventional technology) with 2.226 kg / ha, indicating that the use of zeolite ensures both Physical-chemical parameters of the water but also contributes to a better assimilation of the food.

Key words: carp, polyculture, zeolites, growth performanc