Growth performance, feed conversion and gross margin analysis of Nile tilapia (Oreochromis niloticus) in Valley Dam Based Floating Cages in Semi-Arid Karamoja Sub-Region of Uganda

This study was done to explore the effect of replacing mustard oilcake by linseed oilcake in feed on the growth performance of Nile Tilapia (Oreochromis niloticus). Mustard oilcake (MOC) was replaced by linseed oil cake (LOC) at three different level 0%, 50% and 100% to prepare three different types of diets. Diets were prepared with about 18% analyzed crude protein content. Fingerlings were kept in three happa with three replications for each diet in completely randomized design (CRD). Fish of average weight 5.31 g were stocked in happa having size 1.5m×1.5m×1.2m. The experimental fish were fed 3% of their body weight per day, once in the morning for five months continuously. No significant difference (p>0.05) in final mean weight, final total weight, average daily weight gain (DWG), survival rate, extrapolated gross fish yield (GFY), extrapolated net fish yield (NFY) and apparent feed conversion ratio (AFCR) among different treatments were observed. Hence, linseed oilcake can be used as the substitute in the feed of tilapia, if it is locally available. Journal of Institute of Science and Technology, 2017, 22 (1): 10-16

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Use of tuna industry waste in diets for Nile tilapia, Oreochromis niloticus, fingerlings: effect on digestibility and growth performance

Latin American Journal of Aquatic Research ◽

10.3856/vol41-issue3-fulltext-10 ◽

2017 ◽

Vol 41 (3) ◽

pp. 468-478

Author(s):

Crisantema Hernández ◽

Miguel A. Olvera-Novoa ◽

Domenico Voltolina ◽

Ronald W. Hardy ◽

Blanca González-Rodriguez ◽

...

Keyword(s):

Growth Performance ◽

Oreochromis Niloticus ◽

Nile Tilapia ◽

Basal Diet ◽

Protein Source ◽

Feed Conversion ◽

Industry Waste ◽

Commercial Feed ◽

Nile Tilapia Oreochromis Niloticus ◽

Main Protein

During the tuna canning process, about 52~54% of the total weight of the fish is discarded as waste, which can be processed in order to obtain tuna byproducts meal (TBM), or stabilized as tuna silage hydrolysates (TSH). Both products were tested as replacements of soybean meal (SBM), in diets for fingerling male Nile tilapia Oreochromis niloticus. Seven test diets were isonitrogenous (35% CP) and isoenergetic (19 kJ g-1): a basal diet contained SBM as main protein source (TSH0); four experimental diets had increasing inclusion levels of TSH replacing 25, 50, 75 and 100% of the SBM protein. The sixth diet contained TBM as sole protein source, and a commercial feed for tilapia was used as reference diet (RD). The diets were fed for eight weeks to triplicate tanks, each with 15 fry tilapia (initial weight of 0.89 ± 0.29 g). Tilapia fed the TBM diet had greater weight gain and feed intake, and lower feed conversion ratios than those fed diets containing with TSH. The RD, TSH25 and TSH50 diets gave the similar growth response. Fish fed diets TSH0, TSH75% and TSH100% showed reduced growth performance.

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