A study was conducted to evaluate the effect of three immuno-stimulants (feed addit ives) on growth performance and immune system of 0. niloticus fingerlings. The aim of the present work is to highlight the effect of two local feed additives; black seed, garlic and a potent compound BIOGEN on the growth performance and immunostimulation of O. niloticus fingerlings.
The purpose of the study was to understand the adoption process of ricefield based fish seed production (RBFSP) that has been developed, promoted and established in Northwest Bangladesh. Quantitative investigation based on regression analysis and qualitative investigation using semi-structured interview were carried out to enhance understanding of the adoption process of RBFSP.Quantitative regression analysis showed two important factors: 1) access to suitable rice-plot and 2) availability of tilapia broodfish at the famer level, facilitated adoption of RBFSP.
The omnivorous African sharptooth catfish is a valuable species suitable for culture by smallholder farmers in Cameroon. A five-year research project that brought farmers together with research interests established simple, but effective approaches to increasing catfish fingerling production through improved egg handling, antipredation measures, and higher-density stocking options.
This work aimed to evaluate the effect of poultry by-product meal protein-based diets on some eco-physiological responses of C.gariepinus. Poultry by-product meal wa used to substitue fish meal as a source of animal protein in a 25% protein pelleted feed for African catfish fingerlings Clarias gariepinus. Experimental diets (25% protein), with fish meal protein replaced by protein from poultry by-product meal at three levels 0% (DO), 35% (D35), and 70% (D70) were manufactured and fed to C.gariepinus fingelings.
Human and institutional capacities for developing and managing genetically improved tilapia in Africa are discussed. Discussions are related particularly to the status of hatcheries, rearing facilities, research and extension services, training in genetic enhancement, and fish transfer in major aquaculture countries in Africa. The leading aquaculture producing countries are Egypt and Nigeria along with nine other countries with some intermediate levels of fi sh production. The availability of quality fry and fingerlings constitutes a major constraint.
To determine how best smallholders could maximize the profitability of their catfish hatcheries, the cost/benefit analyses of using fences, hapas and bird nets to exclude predators; as well as over-stocking to create food shortage, were conducted. As compared to the typical production system (fertilized unfenced ponds) and at a stocking density of 10 two-day old fry/m2, survival increased by 28% in fenced ponds, 34% in open hapas and 55% in bird-netted hapas.
To target development efforts, the technological options for investments in Clarias gariepinus hatchery systems were compared for cost, average weight, number of fingerlings harvested, survival and profitability in periurban Yaoundé, Cameroon. Costs were proportional to the level of intensity of production, with labour accounting for about 70% of the total. Profitability was similar among systems, with highly variable survival being a key constraint.
Following a brief description of lake-based hatcheries and nurseries for tilapias, the advantages as compared to land-based systems are discussed, indicating also some of the disadvantages.
The aims of the present study were to develop non-lethal methods to identify individual fish larvae and post-larvae before tagging and accurately follow their growth characteristics. European sea bass (Dicentrarchus labrax) was used as a model species at four different ages ranging from 71 to 100 days post fertilization (dpf).