Fish community structure and recruitment characteristics of Cynoglossus robustus captured with long-bag stow nets at the entrance of Yeoja Bay, Korea

Abstract

This study investigated community structure of fish and recruitment characteristics of the commercially important robust tonguefish (Cynoglossus robustus) in Yeoja Bay, Korea, based on long-bag stow net catches at the entrance. Yeoja bay serves as a crucial habitat and nursery ground for various fish species, exhibiting distinct seasonal community shifts influenced by water temperature and salinity. Small pelagic fish were dominant in spring, whereas demersal fish were predominant from summer to autumn. Recruitment of C. robustus increased following spawning, underscoring the importance of this region as a nursery habitat. Howerver, the rich biodiversity and critical ecological role of Yeoja Bay are threatened by climate change, habitat degradation, and overfishing. This study highlights the urgent need for continuous monitoring and conservation efforts, including the protecting of tidal flats and seagrass beds, the regulating of fishing practices, and further research into environmental factors and spawning grounds to ensure the sustainable use of fishery resources in Yeoja Bay.