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Study on some factors affecting on growth of fish [electronic resource].

By:

Abd El-Rahman, G. A

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Language: English Summary language: Arabic Description: p.633-654Other title:

دراسات غذائية على بعض العوامل التى تؤثر على نمو الأسماك [Added title page title]

Uniform titles:

Zagazig journal of agricultural research, 2004 v. 31 (2) [electronic resource].

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Full Text Article.

In: Zagazig Journal of Agricultural Research 2004.v.31(2)Summary: Nile tilapia (Oreochromis niloticlIs), fingerlings (average initial weight 19.1-22.99 g) were rllised in 36 seventy five -L glass aquariums (litter each) at stocking density of 10 fish per aquarium for 20 of weeks after adaptation period (15 day). The fish were fed daily at 3% of its life body weight in four feeding times per day (8.00 and 11.00 am, 2.00 and 5 pm). Combined effects of dietary protein levels (30 or 35%), water temperature (22, 28, 32°C) and water salinity (0.3 and IS ppt) were studied. In addition, whole fish, flesh analysis, blood components, water quality and survival rate were investigated. Final mean weights were significantly (P<0.001I) higher at 32 and 28°C than 22°C at 15 ppt salinity within all dietary protein levels (30 or 35%). Where fish weights increased by increasing all these factors and their interactions. Also, fced conversion efficiencies were high at 32°C and IS ppt salinity and 35% dietary protein. In both dietary protein levels, growth incrcllS~d with increasing temperature and salinity. At water temperatur~ 32°C and slinity 15 ppt the lowest survival rate w~r~ 36.67 and 43.33% for groups fed diets containing 30 and 35% crudc pl"Otdn, respectively. Therefore, the study suggested that growth ratcs of O.niloticlIs fingerlings lind their survival ratc may bc bcst at 35% dietary protein level, 28°C and 15 ppt.

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Nile tilapia (Oreochromis niloticlIs), fingerlings (average initial weight 19.1-22.99 g) were rllised in 36 seventy five -L glass aquariums (litter each) at stocking density of 10 fish per aquarium for 20 of weeks after adaptation period (15 day). The fish were fed daily at 3% of its life body weight in four feeding times per day (8.00 and 11.00 am, 2.00 and 5 pm). Combined effects of dietary protein levels (30 or 35%), water temperature (22, 28, 32°C) and water salinity (0.3 and IS ppt) were studied. In addition, whole fish, flesh analysis, blood components, water quality and survival rate were investigated. Final mean weights were significantly (P<0.001I) higher at 32 and 28°C than 22°C at 15 ppt salinity within all dietary protein levels (30 or 35%). Where fish weights increased by increasing all these factors and their interactions. Also, fced conversion efficiencies were high at 32°C and IS ppt salinity and 35% dietary protein. In both dietary protein levels, growth incrcllS~d with increasing temperature and salinity. At water temperatur~ 32°C and slinity 15 ppt the lowest survival rate w~r~ 36.67 and 43.33% for groups fed diets containing 30 and 35% crudc pl"Otdn, respectively. Therefore, the study suggested that growth ratcs of O.niloticlIs fingerlings lind their survival ratc may bc bcst at 35% dietary protein level, 28°C and 15 ppt.

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