Effects of brown alga (Sargassum fulvellum (Turner) C. Agardh, 1820) supplementation on growth performance, blood profile, and liver histopathology of juvenile Nile tilapia (Oreochromis niloticus Linnaeus, 1758)

Date of Award


Document Type


Degree Name

Master of Science in Biology



First Advisor

Ragaza, Janice A., Ph.D.


Alternative feed ingredients for high value cultured fish are necessary to lessen feed amount and operation costs while meeting the fish's nutritional requirements. Sargassum fulvellum supplementation in diets of juvenile Nile tilapia (Oreochromis niloticus) was employed to determine its effect on growth performance, feed utilization efficiency, HSI/VSI, carcass composition, blood profile, and liver histopathology. O. niloticus were fed with five iso-nitrogenous and iso-lipidic test diets: positive control, negative control, 3% S. fulvellum meal (SFM), 6% SFM, and 9% SFM for 56 days in a recirculation set-up. Highest average weight gain (545.705.47%), specific growth rate (18.450.28%), highest percentage survival (8817%), and viscera somatic index (12.440.74) were observed in 6% SFM diet. No significant differences (P>0.05) were observed in the serum components. Liver histopathology results seem to be dose dependent making the diet toxic at higher supplementation levels. Nonetheless, supplementation diet of 6% SFM deemed competitive as compared to standard feeds.


The B5.A84 2017