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Replacement of fish meal by fermented fish byproducts silage in the diets of Nile tilapia,(Oreochromis nilotics) fry [electronic resource].

By:

Soltan, M. A

Contributor(s):

Fath El-Bab, A. F

Language: English Summary language: Arabic Description: p.41-61Other title:

إحلال مسحوق السمك بالسيلاج الناتج من تخمر مخلفات الأسماك في علائق زريعة أسماك البلطي النيلي.‪ [Added title page title]

Uniform titles:

Abbassa international journal for aquaculture, 2010, Conference, Special issue [electronic resource]:

Subject(s):

Online resources:

Full Text Article.

In: Abbassa international journal for aquaculture 2010,SISummary: The present study aimed to study the effe<t of incorporation of increasing levels of fermented silage made from fish by-products in diets of Nile tilapia (Oreochromis niloticus) fry. After 90 days from the experimental start, the highest average BW (27.38) was recorded for control group which fed on the basal diet and replacing of 25% or 50% of fish meal FM by fermented fish silage FFS in the diets FFS25 and FFS50 reduced the final body weight BW to 25.08 and 25.22 g but these weights did not significantly different from that fed the basal diet. The higher repladng levels of FM by FFS (75 or 100%) in the diets FFS75 and FFS100 significantly (P<0.001) decreased the BW 20.77 and 13.50 g, respectively. Similar results were also obtained for final body length (Bl). The highest weight gain WG (25.05 g) was recorded for fish fed the control diet (FFG) followed by those fed the diet FFS50 (22.01 g), FFS25 (21.96 g), FFS75 (17.20 g) and FFSI00 (17.16 g), respectively and the differences in weight gain among the different fry groups were significant (P<0.05) and the same trend was observed for specific growth rate SGR. The average feed intake and feed conversion ratio and protein efficiency ratio of Nile tilapia were significantly (P<0.05) affected by the incorporation of fermented fish meal as a substitute of fish meal. Dry mater in whole fish body ranged between 25.99 and 22.18 with insignificant differences. Crude protein ranged between 60.63 and 50.74, ether extract ranged between 22.85 and 17.97, ash ranged between 17.25 and 16.20 with significant differences for ether extract and protein content of whole fish bodies. In condusion, repladng up to 50% of FM by FFS did not affe<ted growth and feed utilization and reduced feeding costs by 15.59% for tilapia fry. The higher repladng levels (75 or 100%) significantly adversed growth and feed utilization parameters.

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The present study aimed to study the effe<t of incorporation of increasing levels of fermented silage made from fish by-products in diets of Nile tilapia (Oreochromis niloticus) fry. After 90 days from the experimental start, the highest average BW (27.38) was recorded for control group which fed on the basal diet and replacing of 25% or 50% of fish meal FM by fermented fish silage FFS in the diets FFS25 and FFS50 reduced the final body weight BW to 25.08 and 25.22 g but these weights did not significantly different from that fed the basal diet. The higher repladng levels of FM by FFS (75 or 100%) in the diets FFS75 and FFS100 significantly (P<0.001) decreased the BW 20.77 and 13.50 g, respectively. Similar results were also obtained for final body length (Bl). The highest weight gain WG (25.05 g) was recorded for fish fed the control diet (FFG) followed by those fed the diet FFS50 (22.01 g), FFS25 (21.96 g), FFS75 (17.20 g) and FFSI00 (17.16 g), respectively and the differences in weight gain among the different fry groups were significant (P<0.05) and the same trend was observed for specific growth rate SGR. The average feed intake and feed conversion ratio and protein efficiency ratio of Nile tilapia were significantly (P<0.05) affected by the incorporation of fermented fish meal as a substitute of fish meal. Dry mater in whole fish body ranged between 25.99 and 22.18 with insignificant differences. Crude protein ranged between 60.63 and 50.74, ether extract ranged between 22.85 and 17.97, ash ranged between 17.25 and 16.20 with significant differences for ether extract and protein content of whole fish bodies. In condusion, repladng up to 50% of FM by FFS did not affe<ted growth and feed utilization and reduced feeding costs by 15.59% for tilapia fry. The higher repladng levels (75 or 100%) significantly adversed growth and feed utilization parameters.

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