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Iranian Journal of Fisheries Sciences، جلد ۶، شماره ۱، صفحات ۹۶-۸۲
عنوان فارسی
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی Estimation of ammonia excretion rates during a period of red tilapia, Oreochromis sp. Culture, considering biomass increase in a water recirculating system
چکیده انگلیسی مقاله A completely randomized experimental design was conducted to estimate ammonia excretion rate by red tilapia (Oreochromis sp.) during different stages of its growth in recirculating water system units typically designed to meet the experiment purposes. Eight weight groups each containing 75individuals of 20, 30, 40, 60, 80, 120, 180 and 200g average weight were considered as treatments in duplicates. The rate of ammonia excretion by each fish group was measured during a 24-hr period. The data was extended to estimate total ammonia excreted by a group of red tilapia during a 115-day culture period (20-200g). The mean daily ammonia excretion rate was significantly different between treatments (p< 0.05). These rates were 34.06±1.23, 32.56±3.28, 27.06±0.87, 17.46±2.19, 12.54±1.30, 12.48±1.41, 7.87±1.82 and 5.83±0.19 mg kg fish-1 h-1 for 20, 30, 40, 60, 80, 120, 180 and 200 g fed fish, respectively. It was estimated that on average 39.4% of input feed nitrogen excreted as ammonia-N during the culture period. Results of this study well addressed the regime of ammonia production in different stage of red tilapia growth in a recirculating water system.
کلیدواژه‌های انگلیسی مقاله
نویسندگان مقاله غلامرضا رفیعی | g r rafiei


سی آر سعد | c r saad


محمدصادق کمررودی | m s kamarudi


محمدرضا اسماعیل | m r ismail


سیدمحمدحسین علوی | s m h alavi


نشانی اینترنتی http://jifro.ir/browse.php?a_code=A-10-600-118&slc_lang=en&sid=en
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/447/article-447-528459.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده fish disease
نوع مقاله منتشر شده پژوهشی
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