Aquaculture and Fishery Management
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Item i EFFECT OF AQUAPONIC SYSTEMS ON WATER QUALITY, GROWTH PERFORMANCE OF NILE TILAPIA AND GROWTH AND YIELD OF VEGETABLES M.Sc. THESIS(HAWASSA UNIVERSITY, 2023-10) JALANE DIDA AKESAAquaculture production is one of an alternative food producing sector. Compared to different alternative ways of aquaculture production, aquaponics system is preferable to mitigate food and nutritional security in Ethiopia. Plants and fish have different growth performances in different culture systems. So the present study was designed to assess how the two aquaponic systems (Media Bed and Nutrient Film Technique) affect the water quality and growth performance of Nile tilapia (Oreochromis niloticus) and their effect on the growth and yield of tomato (Solanum lycopersicum) and lettuce (Lactuca sativa). The study was performed from March to May 2023 (12weeks). Four hundred fingerlings of Nile tilapia (Oreochromis niloticus) of uniform size were obtained from Batu Fish and Other Aquatic Life Research Center and stocked into fish tanks of the experimental units. However, the tomato (Solanum lycopersicum) and lettuce (Lactuca sativa) seeds were purchased from Batu local market, germinated on seedbed and transplanted to the experimental units. The experimental fish were supplied 30% protein content commercial feed twice per day. The water quality parameters such as dissolved oxygen, hydrogen ion concentration (pH), temperature, conductivity and salinity were measured once per two weeks and three times per sampling date. The present study revealed that, pH ranged between 9.26 and 9.45, temperature ranged between 24.63 and 25.7°c, TDS ranged between 1.75 and 1.77 g/L, conductivity ranged between 2.3 and 2.4 mS and salinity ranged between 1.21 and 1.3ppt. WG, FCR, CF, SR, FMTL, and FMBW for the media-filled bed system were 40.36+ 0.19g, 1.2 + 0.0, 2.07+ 0.05, 98.59+0.4%, 14.75+ 0.3cm, and 60.36+ 0.19g, respectively, and for the NFT system, the values were 40.67+ 0.3g, 1.2 + 0.0, 2.18+ 0.3, 98.68+ 0.95%, 14.1+ 0.27cm, and 60.67+ 0.3g, respectively. The water quality parameters and growth performance of the experimental fish between the two systems didn’t show significant differences at 95% confidence interval (P>0.05). However, the growth and yield of tomato and lettuce in MB was significantly different from that of NFT at 95% confidence interval (p< 0.05). Therefore, it was concluded that, the types of the aquaponics systems did not affect water quality, and survival, condition factor, and the growth performance of Nile tilapia, but they did affect tomato and lettuce growth and yield. For good water quality and fish growth, both MB and NFT are recommended, while for better plant growth, MB is recommended.