The Israeli Journal of Aquaculture Bamidgeh 57(2), 2005, 90-96     
 
EFFECTS OF DIETARY FISH OIL,SOY-ACID OIL, AND YELLOW GREASE ON GROWTH AND HEPATIC LIPIDOSIS OF HYBRID TILAPIA FRY

Ercument Genc 1*,Erdal Yilmaz 2 and Ihsan Akyurt 2
 

1 Programme of Fish Diseases, Faculty of Fisheries and Aquaculture, Tayfur Sokmen Campus, Mustafa Kemal University, 31040, Antakya, Hatay, Turkey

2 Programme of Aquaculture, Faculty of Fisheries and Aquaculture, Tayfur Sokmen Campus, Mustafa Kemal University, 31040, Antakya, Hatay, Turkey
 
(Received 8.12.04, Accepted 6.2.05)

Key words: hybrid tilapia fry, soy-acid oil, yellow grease, hepatic lipidosis
 
Abstract


The objective of this study was to compare the effects of dietary lipids on growth and liver histopathology of hybrid tilapia, Oreochromis niloticus x O. aureus , fry (6.0 g). Fish were fed one of six diets containing 8.4% fish oil (control), 8.4% soy-acid oil, 8.4% yellow grease, 5.6% yellow grease plus 2.8% soy-acid oil, 2.8% yellow grease plus 4.6% soy-acid oil, or 4.2% soy-acid oil plus 4.2% yellow grease for 60 days. Growth was similar in all groups and retarded in comparison to earlier studies. Lipid accumulation as well as microvesicular (foamy degeneration) and macrovesicular degeneration in the liver were histopathologically detected.


* Corresponding author. Tel.: +90-326-2455843/1302, fax: +90-326-2455817, e-mail: egenc@mku.edu.tr or ercumentgenc@yahoo.com

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