Marine fisheries exhibit a critical role in global food security by providing essential protein for billions, particularly in developing nations. Sustainability of marine ecosystem is threatened by variety of factors such as overfishing, habitat degradation, pollution, climate change, etc. El Nino, a recurring climatic event characterized by ocean-atmosphere interactions in the Pacific, significantly impacts marine ecosystems. This phenomenon alters sea surface temperatures, ocean currents, and upwelling processes, disrupting food availability and habitats for marine species. It leads to reduced rainfall, altered ocean circulation, and impacts on marine biodiversity and fisheries, such as declines in fish catches. With climate change expected to increase the frequency and severity of El Nino events, adaptive management strategies are essential to mitigate its effects on marine ecosystems, fisheries, and biodiversity.