ISSN: 2639-216X
Authors: Doctolero JS*, Estrella ES and Vera Cruz EM
The study was conducted to determine the toxicity of guava (Psidium guajava), lemon-grass (Cymbopogon citratus) and horse radish (Moringa oleifera) aqueous leaves extract to Nile tilapia (Oreochromis niloticus) fry and to determine the plant extract that will provide better growth performance and survival during nursing period. Result showed that the most toxic plant extract was P. guajava at 6 mL/L and the least toxic was M. oleifera at 24 mg/L. Highest growth performance was obtained in fish reared with M. oleifera and C. citratus aqueous extracts which appeared to be statistically comparable to each other but significantly higher compared to the fish reared without plant extract (control treatment) and reared with P. guajava aqueous extract. Similarly, highest survival rate was obtained in fish reared with M. oleifera and C. citratus aqueous extracts. Lowest survival rate was generated in fish reared without plant extract and those treated with P. guajava extract. Water quality parameters such as dissolved oxygen, temperature and pH were within the range of recommended levels for Nile tilapia culture. The findings of the present study indicated that water immersion of C. citratus (5.00 mL/L) or M. oleifera (10.00 mL/L) aqueous extracts can potentially enhance the growth performance and survival of O. niloticus after 3 weeks of nursing.
Keywords: Water; Psidium guajava; Experimental Fish
