Mineral content in local feed ingredients used by fish farmers in four different regions of Tanzania

  • Francis P. Mmanda Institute of Marine SciencesZanzibar, Tanzania
  • Jan Erik Lindberg Swedish University of Agricultural Sciences
  • Anna N. Haldén Swedish University of Agricultural Sciences
  • Torbjorn Lundh Swedish University of Agricultural Sciences
Keywords: mineral requirements, feedstuffs, fish pond, aquaculture, tilapia

Abstract

This study investigated the content of selected minerals (P, Ca, K, Na, Mg, Fe and I) in local feed ingredients used by tilapia fish farmers in Tanzania. Analyses were performed on 26 local feed ingredients collected at four different geographical locations in Tanzania (Dar es Salaam, Morogoro, Mbeya and Mwanza). The samples were taken randomly from fish farmers, fish feed producers, fingerling producers and animal feed shops or centers near fish farms in each region. The results showed a wide range of mineral concentrations. The highest levels of P was found in fish skeletons (17.8 g kg-1), of Ca in limestone (107.3 g kg-1), of K in gallant soldier (51.0 g kg-1), of Na in marine shrimp (Exhippolysmata oplophoroides) (11.7 g kg-1), of Mg in prawn head waste (4.2 g kg-1), of Fe in azolla (2355 mg kg-1) and of I in full fat soybean (447 mg kg-1). The data on mineral content in feed ingredients can be used as a platform for better-targeted feed formulation for tilapia farming systems. In conclusion, the data suggest that if more than two ingredients are used in the diet, this may be sufficient to meet the mineral requirements of all cultured tilapia species and their hybrids, without inclusion of any mineral premix. 

 

 

Author Biographies

Francis P. Mmanda, Institute of Marine SciencesZanzibar, Tanzania

1.Institute of Marine Sciences, P.O. Box 668, Zanzibar, Tanzania

2. Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, P.O. Box 7024, Uppsala, Sweden

Jan Erik Lindberg, Swedish University of Agricultural Sciences
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, P.O. Box 7024, Uppsala, Sweden
Anna N. Haldén, Swedish University of Agricultural Sciences
Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, P.O. Box 7028, Uppsala, Sweden
Torbjorn Lundh, Swedish University of Agricultural Sciences
Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences, P.O. Box 7024, Uppsala, Sweden
Published
2019-10-10
Section
Articles

Journal Identifiers


eISSN: 0856-860X
print ISSN: 0856-860X