عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This study was carried out to evaluate the combined effect of culture system (biofloc and no-biofloc) and dietary additives (control, Yucca schidigera, Conocarpus erectus and Paulownia fortunei) the feed and growth performance, enzyme activities and culture water quality of Litopenaeus vannamei. White leg shrimp with an average weight of 1.47 ± 0.07 g and 7.00± 0.37 cm were stocked into 24 tanks with 50 L capacity for 30 days. The experiment was based on a completely randomized design with 8 treatments by triplicate including; Biofloc +1% herbal extracts Yucca (BY), Conocarpus (BCO), Palonia (BP), Control (BC) and Without Biofloc+ 1% herbal extracts Yucca (Y), Conocarpus (CO), Palonia (P), Control (C). There were no significant differences in shrimp production parameters between treatments. The highest weight (4.66 ± 0.14 g) and the lowest feed conversion ratio (0.92 ± 0.04) were obtained for shrimp reared in BCO. The highest levels of amylase, lipase and protease are obtained in the Y and BY treatments. Yucca extract in the diet leads to a reduction in ammonia. The results showed that Conocarpus erectus extract could be used to enhance growth and Yucca schidigera extract to improve water quality in Bio-floc system.