{ "background": "The Nairobi slums eco-gardens have emerged as innovative urban development projects aimed at improving environmental quality and public health. These gardens are designed to integrate green spaces within densely populated areas, often situated in or adjacent to informal settlements.", "purposeandobjectives": "This case study examines the impact of these eco-gardens on zebrafish populations, focusing on their health outcomes as an indicator of broader environmental and human health impacts. The objectives are to assess water quality, determine fish survival rates, and analyse any observed changes in fish behaviour or physiology.", "methodology": "A comprehensive assessment protocol was employed, including regular monitoring of water parameters such as pH, temperature, and dissolved oxygen levels. Zebrafish were captured from various garden sites and subjected to standard health assessments, with data collected over a twelve-month period. Statistical analysis using regression models was conducted to identify correlations between environmental factors and zebrafish health outcomes.", "findings": "Fish survival rates varied significantly across different eco-gardens ($\text{Survival Rate} = \beta0 + \beta1(\text{pH}) + \beta2(\text{temperature}),$ with a 95% confidence interval of [48%, 62%] for the model's predictions). Higher pH levels were associated with better survival rates, indicating improved water quality in some gardens.", "conclusion": "The findings suggest that Nairobi slums eco-gardens can positively influence zebrafish health outcomes by enhancing water quality. However, variability in environmental conditions suggests ongoing monitoring and adaptive management strategies are necessary to sustain these benefits.", "recommendations": "Given the observed improvements, it is recommended that future research focus on long-term ecological impacts and explore potential synergies with human health interventions within these eco-gardens.", "keywords": "Nairobi slums, eco-gardens, zebrafish, environmental health, water quality", "contributionstatement": "This study introduces a novel method for