The aquaculture and fisheries sectors are critical sources of nutrition and employment generation in many developed and developing countries. Hence, any disruptions to these sectors due to the COVID-19 pandemic have a far-reaching impact, leading to a cascading chain of disorder affecting people’s food security and livelihoods. Relating to these fish sectors, we reviewed COVID-19’s implications for the food security of these vulnerable countries. The current study indicated that COVID-19 and its related preventive measures have severely disrupted the fish demand and supply chain by creating considerable fish price volatility. As a result, the vulnerable aquatic communities have adopted several short-term coping strategies, including fish overwintering, delayed fish stocking time, and feeding the overcrowded fish with low-priced food. Since the long-term coping strategies are still unclear, we recommended certain longstanding methods that are likely to safeguard food security and livelihoods if adopted.