Increase of the dietary ny3rny6 fatty acid ratio and addition of phosphorus improves liver histological alterations induced by feeding diets containing soybean meal to gilthead seabream, Sparus aurata

In a previous study, several histological alterations were found in the liver of gilthead seabream Ž . fed with a diet containing 30% soybean meal SBM . In the current study, SBM containing diets Ž . were supplemented with either potassium phosphate, zinc sulfate or phytase Aspergillus ficuum , or increasing the dietary ny3rny6 fatty acids ratio to meet that of a fish meal based diet. Diet Ž . Ž . composition did not affect fish growth, feed efficiency FE or protein productive value PER . Ž . Phosphorous supplementation significantly reduced hepatosomatic indexes HSI , although it did not alter liver lipid content. Both phosphorous supplementation and correcting the dietary ny3rny6 fatty acid ratio significantly altered the lipid and protein content in fish muscle. Only these two treatments and principally the corrected dietary ny3rny6 fatty acid ratio, improved ) Corresponding author. 0044-8486r98r$19.00 q 1998 Elsevier Science B.V. All rights reserved. Ž . PII S0044-8486 97 00276-7 ( ) L. Robaina et al.rAquaculture 161 1998 281–293 282 the liver histological alterations observed in fish fed with SBM based diets. q 1998 Elsevier Science B.V.