Journal of
Agricultural Extension and Rural Development

  • Abbreviation: J. Agric. Ext. Rural Dev
  • Language: English
  • ISSN: 2141-2170
  • DOI: 10.5897/JAERD
  • Start Year: 2009
  • Published Articles: 462

Full Length Research Paper

Effect of replacing freshwater shrimp meal (Caridina nilotica) protein with a mixture of plant protein on growth, apparent digestibility, and economic returns of Nile tilapia (Oreochromis niloticus L.)

Anne Maundu
  • Anne Maundu
  • Department of Zoological Sciences, Kenyatta University, P. O. Box 43844 Nairobi, Kenya.
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Jonathan Munguti
  • Jonathan Munguti
  • Kenya Marine and Fisheries Research Institute, National Aquaculture Research Development and Training Centre, P. O. Box 451-10230 Sagana, Kenya.
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Joshua Mutiso
  • Joshua Mutiso
  • Department of Zoological Sciences, Kenyatta University, P. O. Box 43844 Nairobi, Kenya.
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Nasser kasozi
  • Nasser kasozi
  • Abi Zonal Agricultural Research and Development, Institute,National Agricultural Research Organisation, P. O. Box 219 Arua, Uganda.
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David Liti
  • David Liti
  • Department of Biological Sciences, University of Eldoret, Eldoret, Kenya.
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Rekha Sharma
  • Rekha Sharma
  • Department of Zoological Sciences, Kenyatta University, P. O. Box 43844 Nairobi, Kenya.
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  •  Received: 02 May 2022
  •  Accepted: 31 August 2022
  •  Published: 30 September 2022

Abstract

This study investigated the effects of substituting varying levels of a plant protein mixture (PPM) with freshwater shrimp meal (FSM) on growth, digestibility, and economic returns of Nile tilapia. Monosex male Oreochromis niloticus fingerlings (initial body weight, 28 ±0.01 g) were cultured in cages installed in an earthen pond and tanks for 180 and 60 days, respectively. The PPM comprised 50% soybean meal, 25% sunflower cake and 25% cotton seed cake. Replacement of FSM was done at 25, 50, 75 and 100% and diets labelled D1, D2, D3 and D4, respectively. Test diets were compared with a control diet (D0, 0% PPM). After 6 months, fish fed diets D0 and D1 did not differ (p>0.05) in growth performance. There was significant decrease (p<0.05) in fish weight gain as PPM levels increased. Crude protein digestibility decreased significantly (p<0.05) with increasing inclusion levels of PPM. Diet D0 had the highest digestibility followed by D1 and D2 although D0, D1 and D2 were not significantly different (p>0.05). Diet D0 and D1 were not significantly different (p>0.05) hence cost benefit analysis showed that D1 was economically viable than D0. Therefore, PPM could partially replace FSM up to 25% without adverse effects on growth performance. 

Key words: Caridina nilotica, digestibility, economic returns, Nile tilapia, plant protein mixture.