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العنوان
Integral Cultivation of Mullets and Its Effect on the Efficiency of Red Tilapia Intensive Fish Farms Using Underground Saline Water /
الناشر
Mona Mohammed Hassan Nawareg,
المؤلف
Nawareg, Mona Mohammed Hassan.
هيئة الاعداد
باحث / Mona Mohammed Hassan Nawareg
مشرف / Mohammed Hamid Bahnasawy Ayesh
مشرف / Mohammed Mahmoud Abdel-Rahim
الموضوع
الاسماك.
تاريخ النشر
2020.
عدد الصفحات
103 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
علوم الأحياء المائية
تاريخ الإجازة
1/11/2020
مكان الإجازة
جامعة دمياط - كلية العلوم - Zoology
الفهرس
Only 14 pages are availabe for public view

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Abstract

Two experiments were carried out as follows:
First experiment was conducted to assess the effect of mono- and polyculture systems of Florida red tilapia (Oreochromis spp) and Thinlip grey mullet (Liza ramada) in concrete tanks using underground brackish water. Growth performance, feed efficiency, body chemical composition, and health status of the experimental fish were evaluated after 42 days rearing period. Five experimental treatments were carried out as follow: T1= 100% Red tilapia; T2= 75% Red tilapia and 25% Mullet; T3= 50% Red tilapia and 50% Mullet; T4= 25% Red tilapia and 75% Mullet; and T5= 100% Mullet. Fish of T1 showed the highest values of growth performance, feed utilization, and productivity, while T5 showed the lowest levels of it. Liza ramada did not show any significant positive effect when co-cultured with red tilapia in a concrete tank. Rearing red tilapia under the monoculture system is much better than the polyculture system with Liza ramada as the latter species have one-third growth performance, feed utilization, and productivity that of red tilapia. According to the present data, we recommend not stocking mullet with red tilapia for the previous negative indices in concrete tanks.
Second experiment was conducted to evaluate which stocking density of mullet will be good with the most common density of Red tilapia reared in hapas in earthen freshwater ponds systems. Growth performance, feed utilization, body chemical composition, health status, heavy metals content, and hematological parameters of the experimental fish were evaluated after 42 days rearing period. Hybrid red tilapia (T) and mullet (M) were stocked at five treatments: (35:0, 35:3, 35:6, 35:9, 35:12), respectively. Hybrid red tilapia showed higher growth performance and feed efficiency indices than mullet. Polyculture gave higher growth compared with monoculture. The growth performance, fish biomass, and feed efficiency increased with decreasing of mullet ratio in each treatment. For blood analysis, T2 showed the highest value in glucose, hemoglobin, and total protein and the lowest cortisol level. The content of heavy metals in the T1 was the highest, but these levels were lowest in T2 compared to other treatments. from these results, it could be concluded that the polyculture system of red tilapia and striped mullet reflected higher fish performance, fish biomass, and whole-body composition than the monoculture one. Besides, hematological analyses exhibited healthier blood and serum indicators and less content of heavy metals. The best treatment that could be recommended is T2, with a stocking ratio of 35 red tilapia: 3 striped mullet.