Wildlife & Fisheries management
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Item Evaluation of African catfish Clarias gariepinus responses to graded levels of zinc practical diet(2016) Umma, S. B.; Olukunle, O.Fisheries and aquaculture contribute significantly to food security and livelihood; therefore, fish and fish products are projected as being among the most widely traded foods. Fish like other animals has requirement for essential nutrients in order to grow properly. Such essential foods are available in the wild for fish to forage extensively to meet their body needs. The variable factors such as climate change, environment, season of the year and location among others determines the abundance and search for these foods. These factors modifies aquatic environment and make it difficult for fish in the wild to forage adequately. Therefore, enough food in the form of artificial diet is required to furnish fish with the nutrients it need out of its natural environment for optimal growth. However, most of the challenges facing the formulation of feed are on the affordability, ready acceptability and bioavailability for fish optimal growth. Therefore, trace minerals which are needed in minute quantity at a time for the general health maintenance and growth of an animal offers a soft landing to this challenges; however, their deficiency perturbs the wellbeing of the fish. Zinc has been recognized to play a vital role in almost every aspect of living system either directly or indirectly. The biochemical components of fish diet that needs varying in terms of percent inclusion to render the protein in feed more bioavailable should be encouraged. The objectives of this study includes determination of the; required dietary zinc inclusion that is essential for juvenile African catfish Clarias gariepinus growth, serum biochemical profile of African catfish juveniles post feeding response to growth, and haematological responses of African catfish (Clarias gariepinus) to graded levels of zinc nutrient. Growth performance, serum biochemistry and physiological response to graded levels of practical dietary zinc fed to African catfish (Clarias gariepinus) juvenile were investigated. Water quality was monitored throughout the period of the study and the results showed that all parameters were within the required and tolerable ranges for catfish. The mean weight of fish fed dietborne zinc nutrients revealed that there were no significant differences in growth responses to graded levels of dietary zinc inclusions of 0, 5.46, 10.96, 16.40, 21.86 and 27.33mg Znkg-1 . The results for the mean weight revealed that there are no significant variations in mean weight since P>0.05. However the mean weight for the diet increased with respect to dietary zinc inclusion (Figure 1). The SGR, FCR, GFCE, F.I and RGR, also showed no significant variations among fish fed. The PCV revealed that there are no significant variations among the values for the fish fed with Diets 3, 4 and 5. The serum biochemistry revealed significant variations in the serum total protein (T,P) among fish fed on all the Diets, with the highest values in fish fed Diets 4 and the minimum values in fish fed Diet 2. Fish fed dietary zinc had slightly altered haematological and serum biochemistry in response to dietary zinc.Item Integrated aquaculture: a tool for sustainable development/food security and poverty alleviation in achieving MDG’s goals(2014) Olukunle, O.Aquaculture is a multiculture of plants and animals in an aquatic environment. Thereby aquaculture is enriched through integration of formerly existing cultivation of crops cum horticultural, and /or agronomical or domesticated animals such as piggery, poultry, rabbitery or even wild domesticated animals such as guinea fowls, and cane rats. Hence, this study investigated integrated aquaculture cum horticulture as a possible tool for sustainable food production in order to ensure food security in Nigeria and alleviate poverty. The study utilized four homestead concrete tanks located at the back of my house in University of Ibadan senior staff quarters. Catfish bloodstock’s males and females were used to raise fry through fingerlings to juveniles to adult fish. Data were taken at each stage of the fish life cycle i.e. the products harvested and sales. Data on numbers of horticultural trees planted were taken and numbers of produce at harvest were recorded. These data were collated and analyzed yearly and at the end of the 10- year period. The result showed that diversification in integrated aquaculture ensures better environmental and on farm resource management which is much needed globally but much more in the developing countries for food security and poverty alleviation. At each point in time, there is one product or the other available for consumption or for sale which ensured better cash flow. During the dry season the drought was ameliorated by the availability of water for wetting the crops and incorporation of vegetables growing into the system. Horticulture cum fish farming integrated system has been adjudged recently to be a solution to drought, poor soil condition management; climate change along with unsustainable water management and farming practices. This study showed that this system is more natural and sustains better food production practice. It is capable of bringing food production closer to urban consumers who do not have access for extensive farm land and reduces the transport cost in retail food marketing.