This study examined the assessment of constraints of fish processing and storage technologies among processors and marketers in Delta State, Nigeria. The objectives were to describe the socio-economic characteristics of respondents, assess their awareness of fish processing and storage technologies, and identify the most frequently used technologies and associated constraints. A total of 180 respondents were selected through simple random, snowball, and purposive sampling techniques, and data were collected using structured questionnaires. Analysis was conducted using frequency counts, percentages, and mean rankings. Results revealed that 61.7% of respondents were female, 81.1% were married, and the mean household size was five persons. About 47.2% had secondary education, while 42.8% sourced capital from cooperatives. Locally fabricated smoking kilns were the most commonly used (34.4%), but were constrained by cuts, burns, and stressful use. For modern smoking kilns, high cost and poor access to improved technologies were the most critical challenges. The study concludes that although modern technologies such as the NSPRI smoking kiln and iced fish box offer improved efficiency and product quality, their adoption remains low due to high costs, limited awareness, and poor accessibility. It is recommended that government agencies, research institutes, and development partners intensify efforts in developing and disseminating affordable and user-friendly technologies, strengthening extension services, providing financial support, and implementing gender-sensitive policies to reduce post-harvest losses and improve the livelihoods of small-scale fish processors in Delta State.