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Food safety of fresh fish is an important concern because fish is highly perishable and may be misused with hazardous preservatives such as formalin. This study aimed to determine formalin content and analyze the relationship between length and weight of Nile tilapia (Oreochromis niloticus) and formalin levels in traditional markets of Gorontalo City. The study was conducted from January to February 2026 in five traditional markets, namely TPI Tenda, Moodu, Potanga, Andalas, and Sentral. Nile tilapia samples were analyzed using a formaldehyde test kit, and formalin levels were expressed in ppm. Total length and fish weight were measured, and the relationship between physical size and formalin content was analyzed using Pearson correlation. The results showed that all Nile tilapia samples tested positive for formalin, with concentrations ranging from 0.11 to 0.23 ppm. The highest formalin levels were found in TPI Tenda and Moodu, each at 0.23 ppm, while the lowest level was found in Sentral at 0.11 ppm. Fish length ranged from 19.43 to 25.61 cm, while fish weight ranged from 0.17 to 1.78 g. The correlations between length and formalin content and between weight and formalin content were both very strongly negative, with r = -0.97. These findings indicate that smaller fish tended to contain higher formalin levels. Market supervision, trader education, and formalin-free fish handling practices should be strengthened to protect consumer health.

This study aims to know the management of the Mosque Prosperity Board (BKM) of At- Tawwabin Mosque, Jalan Pimpinan, Medan City, in community economic empowerment. The background of this research is based on the need to optimize the function of mosques not only as places of ritual worship but also as centers of social and economic empowerment. In practice, the management of mosque assets such as parking areas and the organization of Ramadan stalls has become a strategic effort implemented by BKM to improve the welfare of the surrounding community. However, the implementation of these policies also creates social dynamics that require professional and equitable management.This research employs a qualitative approach with a descriptive method. Data were collected through field observations, in-depth interviews with the chairman and administrators of BKM, parking attendants, and Ramadan stall traders, as well as documentation of mosque activities. Data analysis was conducted through data reduction, data presentation, and conclusion drawing, supported by triangulation techniques to ensure data validity.The findings indicate that the management of BKM At-Tawwabin has implemented planning, organizing, actuating, and controlling functions in managing mosque-based economic programs. Parking management provides employment opportunities for local residents, while Ramadan stalls significantly increase the income of small traders during the holy month. Overall, participatory and structured management enables the mosque to function not only as a center of worship but also as a center of economic empowerment that contributes meaningfully to community welfare.