Effect of Dietary Protein Level on Growth Performance and Yield of Nile Tilapia (Oreochromis niloticus, L. 1758) in Cage Culture in Lake Hora- Arsedi, Ethiopia

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Mulatu Ayenew
Abebe Getahun

Samenvatting

This  study was  conducted at  Lake  Hora-Arsedi  for  five months to  evaluate  the  effect  of  various  dietary  protein  levels  on growth  performance  of  Nile  tilapia  (Oreochromis  niloticus)  and  on water  quality. Eight cages (1 m3  each) were  randomly allocated to a duplicate to represent three  treatments and  a control (T1, T2, T3 and C).  Juveniles of  Nile tilapia (Oreochromis niloticus) were  collected from Lake  Babogaya and  randomly stocked at  a rate  of 50 fish per cage. Their  initial  length  and  weight  ranged from  12.71  ± 0.07  to 12.76  ± 0.04  cm  and  35.3  ± 0.46  to 36.43  ± 0.70  g,  (mean ± SE), respectively.   Three    diets   were    prepared  in   pellet   form   which consisted  of  25%,  35%  and  45%  dietary  protein  level  from  three locally available plant protein sources (wheat  bran,  wheat  flour and niger seed cake)  and  one  animal by product  (meat  bone  meal as the main protein source). Fish  in T1, T2 and  T3 were  fed on 25%,  35% and 45% crude  protein, respectively, with the rate  of 3% of their body weight,  twice  a  day  manually  using  feeding  tray.  Fish  in  control depended only  on  natural  food  from  the  lake.  The  result  showed significant variation (P < 0.05)  in final body weight and  length, Daily growth  rate  (DGR),  Fulton Condition Factor  (FCF),  and  Visceral to Body Weight Ratio (VBWR). Insignificant variation was observed in Specific  Growth  Rate   (SGR)   and   Food   Conversion  Ratio  (FCR) among treatments. But,  high  SGR  and  best FCR  were  obtained  at 35% crude  protein. Over all, best growth performance was observed  in fish that  received 35%  crude  protein. The  best performing fish’s final  weight,  final  length,  DGR,  SGR,   FCR,  FCF  and   total  %  of VBWR were 185.76  ± 2.23, 18.51  ± 0.20 cm, 1.00 ± 0.34g/day, 1.079 ± 0.19%/day, 3.69 ± 0.49,  2.45 ± 0.11g/cm3 and  6.67%,  respectively. On the other  hand,  there  was no significant variation in survival rate, water  quality parameters and  plankton  abundance. Therefore, this study recommended that a diet containing 35% dietary crude  protein for juvenile  Nile  tilapia  is  optimum  in  terms of growth  performance and   profitability,  and   does not  impact  water   quality  and   plankton abundance in cage culture system.


 


 

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Ayenew, M., & Getahun, A. (2023). Effect of Dietary Protein Level on Growth Performance and Yield of Nile Tilapia (Oreochromis niloticus, L. 1758) in Cage Culture in Lake Hora- Arsedi, Ethiopia. Ecological Insights, 8(1). https://doi.org/10.59411/d484ea66
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Ayenew, M., & Getahun, A. (2023). Effect of Dietary Protein Level on Growth Performance and Yield of Nile Tilapia (Oreochromis niloticus, L. 1758) in Cage Culture in Lake Hora- Arsedi, Ethiopia. Ecological Insights, 8(1). https://doi.org/10.59411/d484ea66

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