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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Utilization of Fermented Feather Meal as a Replacement of Fish Meal in the Diet of Hybrid Clarias Catfish) ผู้เขียน: Chumlong Arunlertaree, Ek Rakyuttithamkul สื่อสิ่งพิมพ์:pdf AbstractThe suitability of replacing fish meal in the hybrid clarias catfish diet with fermented feather meal was evaluated. The fermentation by yeast was performed to increase efficiency of feather meal. Five diets were formulated with diet 1 containing 100 % fish meal (control diet) and diet 2, 3, 4 and 5 were 25 %, 50 %, 75 %, and 100 % of fermented feather meal replacement of fish meal in the diet formula respectively. The results showed that average final weight (125.72?10.65 to 132.67?6.91 g), average daily weight gain (0.92?0.20 to 1.05?0.12 g/ind/day), feed conversion ratio (FCR) (2.62?0.30 to 2.97?0.62) and apparent net protein retention (ANPR) (25.43?4.51 to 29.86?2.89 %) of hybrid clarias catfish fed with diet formulas 1, 2 and 3 were not significantly different (P>0.05). Meanwhile, protein efficiency ratio (PER) (0.91?0.04 to1.26?0.15) and protein intakes (PI) (45.23?0.41 to 50.88?0.486.91 g/ind) were not significantly different (P>0.05) among hybrid clarias catfish fed with diet formulas 1, 2, 3 and 4. Survival rate (100 %) was not significantly different (P>0.05) among all treatments. This study suggested that the percentage of fish meal replacement with fermented feather meal in hybrid clarias catfish diet at 25 % had a close growth and feeding efficiency to fish meal diet and was not significantly different from fish fed with the control diet. The 25 % of replacement fish meal by fermented feather meal could reduce diet cost by about 0.81 baht/kg. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Quantity and Distribution of Plant Nutrients on Eutrophication in Bang Pra Reservoir, Chonburi Province) ผู้เขียน: ดร.รัฐชา ชัยชนะ, รองศาสตราจารย์ , Chumlong Arunlertaree, Boonsong Srichareondham, ดร.ณรงค์ วีระไวทยะ, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe main objectives of this study were to study the quantity and variation of plant nutrients in water bodies supplied to Bang Pra reservoir including the characteristics of distribution and variation of plant nutrients and phytoplankton in Bang Pra reservoir. This study was conducted during March 2001 – February 2002. In the inflowing brooks, the quantity of nitrite and total ammonia were significantly different (p<0.01) both in each brook and in each month. It was demonstrated that the quantity of nitrate and orthophosphate were significantly different (p<0.01) in each month but not different in each brook (p>0.05). In Bang Pra reservoir, the quantity of nitrite in each water sample was different (p<0.05) and the quantity of total ammonia was significantly different (p<0.01). When considering both quantity of nitrite and total ammonia in each month, it was shown that they were significantly different (p<0.01). Statistical analysis indicated the significant difference of othophosphate quantity (p<0.01) in each month but not in each water sample station (p>0.05). Given these conditions, Bang Pra reservoir can be classified as a eutrophic lake. High quantity of plant nutrients in Bang Pra reservoir was mainly found at water sample stations of water receiving areas located at the mouth of brooks. The biological analysis revealed that phytoplankton, which was mostly found in Bang Pra reservoir was Aulacoseira, in Division Chromophyta. Moreover, in June, November 2001, and January 2002, Aulacoseira was found in such large quantity compared to other months that these periods could be regarded as periods of phytoplankton bloom. |
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