To investigate the otolith morphological characteristics of Collichthys lucidus in the Yangtze River estuary and their relationships with individual growth traits （body length and body mass）， a total of 409 specimens were collected from June 2022 to May 2023. Nine otolith morphometric parameters， including length， width， perimeter， area， maximum radius， minimum radius， minimum bounding rectangle area， aspect ratio and radius ratio were systematically measured on both left and right otoliths. Principal component analysis （PCA） was used to extract the key variables representing otolith shape variation. Subsequently， the relationships between otolith morphological indicators and body length/weight were analyzed and fitted using exponential， linear， logarithmic， power， and polynomial functions. The results indicated high consistency in major morphological parameters between left and right otoliths. However， significant differences （P<0.05） were observed in specific parameters： otolith length （L₁）， length-to-width ratio （L₃）， minimum radius （r）， radius ratio （L₄）， and perimeter （P₁）. PCA revealed that otolith length， minimum bounding rectangle area， and radius ratio were the most influential variables in shape variation. Among them， minimum bounding rectangle area showed no significant difference between sides （P>0.05）， and thus data were pooled for further analysis. Polynomial models best described the relationships between otolith length and rectangle area with body length （R²>0.85， P<0.05）， whereas power function models performed best in fitting their relationships with body weight （R²>0.91）. The radius ratio showed poor correlation with both growth indices.This study demonstrates that otolith length and minimum bounding rectangle area can serve as effective predictors of individual growth in C. lucidus. These findings provide a theoretical basis for understanding the linkage between otolith morphology and fish growth， and offer practical insights for fisheries resource assessment and species management.