The genus has been shown to be neither routinely investigated norconsidered under environmental and sanitary legislation.In fact,the bacterium may cause remarkable liabilities for fish farms and serious illnesses in humans. Liabilities are also associated with shelf time owing to the high concentrations of bacteria .Infection dose for Aeromonas in human beings has still to be defined. Cooking process may inactivate these bacteria; however, cross-contamination remains a threat against health, especially in the case of high-risk groups such as children,elderly people, and immune depressed individuals. This microorganism has frequently been detected in the feces of patients with HGS-gastroenteritis .
Although Brazil has native aquaculture species with great productive and economic potential, none of them, yet, has scientific and technological information that allows the structuring of the production chain. Thus, the main challenge of national aquaculture research is to generate knowledge about genetics and breeding, reproduction, physiology, nutrition, health, production systems,slaughter, processing and the market related to these species. For this, it is essential to bring research bodies closer to the productive sector and coordinated interaction between the researchers, generating knowledge and technologies for the agents of the production chain, in an increasingly efficient manner.In this sense,stacking pot there is already research in the areas of reproduction and genetic improvement of fish, nutrition and feeding of aquaculture species with the production of more sustainable rations that minimize the environmental impact,conservation and management of fishery resources, health of aquaculture species,agro-industrial processing of fish, aquaculture production systems, effluent treatment and reuse and sustainable development of continental artisanal fishing.
Nowadays, agriculture including market gardening, is facing many challenges such as the increase in food supply and the need for agricultural production that guarantees food safety, nutritional quality and respect for the environment .Indeed, market gardening production, particularly that of tomatoes in Burkina Faso plays an important nutritional and economic role, with annual production estimated at 300,000 tons, including an export of 100,000 tons . Thus, its consumption contributes to the intakes of fibre, antioxidant compounds and minerals . The profitability of the sector requires an intensive use of phytosanitary products to ensure good physical quality of the tomato without trace of pests. Studies on some market garden sites revealed bad phytosanitary practices such as the non-respect of prescribed doses and protection and hygiene rule during treatments, and mismanagement of empty pesticide packaging .The bad use of pesticides in this intensive agricultural practice is now being questioned by research and civil society, given the negative impacts of market gardening on the environment, producers and consumers’ health. Among these risks, the bioaccumulation of trace metal elements by market gardening products, including tomatoes, can lead to serious health risks . To face this situation, groups of stakeholders have emerged and are advocating sustainable agriculture through agroecological practices and effective consideration of the harmful environmental impacts of current forms of agriculture . In Burkina Faso, the national council for organic agriculture is working to promote biological agriculture through the certification of several tomato production sites, including the agroecological school farm Béo-Neeré.
Indeed,the practice of ecological market gardening produces fruits and vegetables with better micronutrient contents compared to conventional agriculture . Moreover,the physico-chemical and nutritional characterization, particularly trace metal elements, 15N nitrogen and phosphorus isotopes contents, can be considered as an index of quality and authenticity of tomato varieties . There is no comparative study on the above-mentioned parameters of tomato between an organic and conventional site in Burkina Faso. The present study on three varieties of tomato aims to assess the influence of biological and conventional agriculture practices on the bioaccumulation of trace metal, 15N nitrogen and phosphorus isotope in tomato. The experimental device on the 2 sites is a Block Fisher with 3 repetitions. The elementary plots, separated by 1.5 m, are made up of 4 lines,each 3 m long.