Nazael MadallaSokoine University of Agriculture (SUA) | sua · Department of Animal Science and Production (DASP)
Nazael Madalla
PhD (Aquaculture Nutrition)
About
28
Publications
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Introduction
Skills and Expertise
Additional affiliations
July 2003 - March 2016
July 2003 - June 2016
Publications
Publications (28)
This review paper provides an in-depth analysis of the current status, challenges, and strategies for improvement within the fish feed industry in East Africa, focusing on Kenya, Uganda, Tanzania, and Rwanda. Aquaculture production in these countries is experiencing steady growth, driven by increasing demand for fish and fish products for both nutr...
Seeds and feeds are among the most important inputs required for sustainable aquaculture industry development in any country worldwide. However, the value chain analysis of seeds and feeds in most developing countries including Tanzania has not been mapped, and the key actors are not identified and characterized. To address this knowledge gap, we m...
An experiment was conducted to compare the effects of fertilizer application alone, concentrate feeding alone and combination of fertilization and feeding on water quality parameters and growth performance of sex-reversed Nile tilapia (Oreochromis niloticus). Three treatments (weekly fertilization with urea and Diammonium Phosphate (DAP), concentra...
Housefly maggots were cultured on various organic wastes viz. cow manure, poultry manure, pig manure, cattle offal and kitchen leftovers, using developed culture units. The suitability of developed culture units and the effects of type of substrate of culture, length of culture and mass of substrate on wet yield and proximate composition of maggots...
The use of medicinal plants to control reproduction in aquaculture have recently received considerable attention because they are biodegradable, safe, effective and locally available. However, information on their effects on gonadal characteristics and histological features in fish is currently limited. The present study evaluated the gonadal chara...
Growing mixed-sex Nile tilapia, Oreochromis niloticus in earthen ponds to table size is a major challenge due to its early maturity and prolific breeding. This study determined the effects of two medicinal plants; Aspilia plant, Aspilia mossambicensis and Neem tree, Azadirachta indica on hatchlings production, growth performance, feed utilization,...
This chapter provides an overview on forestry education and the emergence of participatory forest management (PFM), Reducing Emissions from Deforestation and forest Degradation (REDD+) and their link to climate change in Tanzania. Other emerging issues discussed in this chapter are community perception, the need for paradigm shift, value chain deve...
Lack of affordable feeds is one of the major constraints facing small-scale fish farmers in Tanzania. This study evaluated the suitability of moringa leaf meal (MLM), cassava leaf meal (CLM) and cassava root meal (CRM) as novel ingredients in Nile tilapia, Oreochromis niloticus diets. Each of the ingredients was processed in an attempt to remove th...
Abstract
Ground and sun dried cassava leaf meal (CLM) was evaluated as a protein source for Oreochromis niloticus juveniles. Biochemical analyses, digestibility study and growth trial were undertaken. Biochemical analyses showed that grinding followed by sun drying resulted into 60% reduction of hydrogen cyanide while saponins, phenols, tannins and...
Uncontrolled breeding and precocious maturity in Nile tilapia, Oreochromis niloticus can be avoided by using all-male population. This study compared the growth performance, survival rate, condition factor and final fish tank biomass (yield) of mixed-sex and hormonal-sex-reversed O. niloticus and hybrids (O. niloticus × O. urolepis hornorum) cultur...
The suitability of different mixtures of soybean meal (SBM), cottonseed meal (CSM) and groundnut cake (GNC) as ingredients to replace fish meal in the diets of Nile tilapia (Oreochromis niloticus L.), was evaluated over a 56-day growth period. Nine isonitrogenous (320g.kg-1), isolipidic (100 g.kg-1) and isoenergetic (18 KJ.g-1) test diets were form...
Most farmers owned one (54.2%) to two ponds (37.5%) and the average pond size was larger (631 m2) in Mbarali (P ≤ 0.05) than in Mvomero (345 m2). Most farmers cultured pure stand of Nile tilapia (79.3% in Mvomero and 89.5% in Mbarali) and only few farmers (20.7% in Mvomero and 5.3% in Mbarali) practiced polyculture of Nile tilapia and African catfi...
A study was carried out to assess production performance and value chain of Nile tilapia grown in ponds of small-scale farmers in Morogoro region, Tanzania. Information was collected through individual interviews of 30 fish farmers. The main reasons for culturing fish were provision of animal protein food for home consumption (66.7%) and generation...
The nutritional suitability and cost effectiveness of cottonseed meal (CSM) as protein source in the diet of Nile tilapia (Oreochromis niloticus L.) with mean initial weight 4.24±0.20 g, was evaluated over a 56-day growth period. Four isonitrogenous (320 g kg-1), isolipidic (100 g kg-1) and isoenergetic (18 KJ g-1) test diets were formulated in whi...
This study investigated the biochemical composition of some Ghanaian oilseed by-products namely; soybean meal (SBM), cottonseed meal (CSM), groundnut cake (GNC) and groundnut husk (GNH) and their digestibility by juvenile Nile tilapia (Oreochromis niloticus L.). The biochemical composition was evaluated in terms of proximate composition, essential...
Two experiments were carried out to evaluate the nutritive value of Moringa oleifera leaf meal (MOLM). In experiment 1, the effect of substituting Moringa oleifera for cottonseed cake (CSC) on milk yield and composition of cross bred cows fed napier grass (Pennisetum purpureum) as basal diet was determined. In experiment 2, dry matter degradability...