تأثير استخدام الخليط البكتيري - الإنزيمي وخميرة الخبز والثيباكس في الأداء الإنتاجي لأسماك الكارب الشائع ((Cyprinus carpio L. المستزرع في الأقفاص العائمة

Abstract

The present study concerned the cultivation of the common carp (Cyprinus carpio L.), in floating cages during the period from 01/05/2015to 01/10/2015 in order to get best growth and production as a result of adding mixture of enzymes and bacteria with or without yeast(Saccharomyces cerevisiae) and the Thepax. The study included six treatments. Each treatments contains 6000 fish distributed equally among three similar replicates. The average weights of the cultivated fishes were ranged between 61.00 and 87.33 gram.The experiment results were assessed according to the following criteria: percentage of mortality, the total weight gain, daily growth rate, the relative growth rate, specific growth rate, food conversion rate , food conversion efficiency and, increase in the Bio-mas. The current study proved that the fourth treatment which composed of (0.25 kg of bacterial enzymatic blend and 0.5 kg of yeast per ton of food) is highly superior in terms of the most of the qualities that have been studied compared with the other experimented treatments. It followed by the fifth-treatment which was (0.5 kg of bacterial enzymatic blend and 0.5 kg of yeast per ton of food). The fifth treatments is superior to the third, the second and the sixth treatments. The third treatments as (0.5 kg of bacterial enzyme blend per ton of food), the second-treatment was composed of (0.25 kg of bacterial enzyme mixture per ton of food) and the sixth-treatment was (0.5 kg Thepax per ton food).The statistical analysis does not showed in most cases, any significant differences between the second, third and sixth treatments. While, the first treatment (without any addition (control treatment)) has values the least significant level among all the other treatments. We noticed from our experiment a significant drop in fish mortality for treatments that have been with the additives. The value of the increase in Bio-mas per cubic meter are (73.11 kg, 63.92 kg, 49.62 kg, 44.99 kg, 43.04 kg, and 22.04 kg) for the fourth, fifth, third , second, sixth , and control treatments respectively