بررسي بازدهي استفاده از سيستم توليد توده زيستي (Biofloc) در پرورش متراكم ماهي كپورمعمولي (Cyprinus carpio)

The application of biofloc technology in intensive culture of Common carp (Cyprinus carpio) fingerlings

فن اوري توليد توده زيستي (Biofloc Technology) روشي براي تجزيه پسماندهاي آلي به ‌وسيله ميكروارگانيزم‌ ها و توليد ذرات يا توده‌ هاي زيستي مغذي است. پژوهش حاضر به‌ منظور بررسي امكان كاربرد اين فن اوري در پرورش متراكم بچه ‌ماهيان كپورمعمولي (Cyprinus carpio) انجام شد. ماهيان مورد مطالعه در دو گروه وزني (3-1 گرم و 22-16 گرم) به‌ مدت سه هفته در حوضچه‌ هاي پلاستيكي45 ليتري پرورش داده و با تيمارهاي غذايي حاوي 100% غذاي كنسانتره (تيمار شاهد) و 25 و 50 درصد توده ‌زيستي تغذيه شدند. در طول دوره آزمايش، شاخص‌هاي كيفي آب شامل آمونياك، نيتريت و نيترات مورد سنجش قرار گرفتند. براساس نتايج حاصل، تفاوت معني ‌داري در مقادير درصد افزايش وزن بدن، ضريب رشد روزانه، ضريب رشد ويژه، فاكتور وضعيت و بازماندگي بين تيمارهاي آزمايشي و تيمار شاهد وجود نداشت (0/05

Biofloc technology is a technique of enhancing water quality in aquaculture through balancing carbon and nitrogen in the system. The aim of this study was to determine the effects of biofloc technology in intensive culture of common carp fingerlings. Two groups of fingerlings (1-3 and 16-22g) were cultured in 45L tanks for 21 days. For each group, three following feeding treatments were assigned: 50% commercial diet (CD) + biofloc products, 75% CD + biofloc products and 100% CD as a control. Growth performances and physico-chemical parameters of water were measured and the results indicated that the fish fed with 50% CD + biofloc products show high percent weight gain than other treatments in first group (P > 0.05). But no significant difference was observed in case of growth performances in second group despite of decreasing in feed intake in bioflocs treatments. Also the results showed that application of biofloc system in intensive carp culture decrease concentration of ammonia, nitrite and nitrate despite of no water exchange (1% daily) in these treatments whiles water was exchanged at a rate approximately every 10 min in control. The results suggest biofloc technology seems to be efficient for intensive farming of common carp.