Aquaculture and Fishery Management

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    EFFECTS OF DIFFERENT PROCESSING METHODS ON NUTRIENT COMPOSITION OF SWEET POTATO LEAF AS FEED FOR NILE TILAPIA, OREOCHROMIS NILOTICUS (LINNAEUS, 1758)
    (HAWASSA UNIVERSITY, 2023-10) TIGIST SEYFE BELACHEW
    The use of alternative feeds aims to increase productivity and reduce the feed costs in aquaculture production. The present study was conducted to evaluate the effects of different processing methods on nutrient composition of sweet potato leaf (SPL) and its effect on growth performance, feed utilization and body composition of O. niloticus. Fresh sweet potato leaves were collected and processed differently, namely air dried (AD); yeast fermented (YF); rumen fluid fermented (RF) and naturally fermented (NF). Following proximate analysis five isonitrogenous and isoenergetic feed: one control diet and four processed SPL based diets were formulated by replacing 30% CP of SBC with processed sweet potato leaf CP. A total of 300 Nile tilapia fingerlings each with an average body weight of 10.55±0.19g were stocked in 15 hapas installed in the concrete ponds in triplicate and fed with 5% of their body weight three times a day for three months. The results of proximate analysis of SPL showed the highest CP (33.9%), and lowest CF (7.80%) in YF and the highest fat (8.55%) and ash (12.14%) content were recorded in RF. AD SPL showed the highest DM (93.41%) and NFE (55.87%) content. The fish was survive 100% in all treatment except in fish feed with ADSPL based diet (96.6%). Fulton’s condition factor of experimental fish was greater than 1 in all treatment. SR and FCR was not affected by tested diets (P > 0.05). However, a significant difference in growth and feed utilization parameters were noticed. Fish fed with control diet showed better weight gain (61.85g), specific growth rate (1.66%/fish/day) and feed utilization efficiency than others except fish fed with yeast fermented sweet potato leaf. Therefore, it can be concluded that the yeast fermented sweet potato leaf meal can be used for O. niloticus feed without any adverse effects on growth performance, feed utilization and body composition.
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    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 AKESA
    Aquaculture 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.