To investigate the effects of different diets （iced trash fish， expanded diet and powder soft diet） on growth performance， gastric evacuation， and digestive enzyme activity in Takifugu flavidus， a 60-day indoor growth experiment was conducted with three replicates per group， each containing 30 individuals， and the fish in all cages continued to be fed respectively with above three diets to apparent satiation. Gastric evacuation rate experiment was conducted using the same dietary groups （three replicates each）， with sampling of gastric contents at 0， 2， 4， 6， 8， 10， 12， 14， and 16 hours postprandial to determine percentage residual stomach content. Meanwhile， liver and intestinal tissues were collected for analysis of digestive enzyme activitiy variations. The results showed that： （1） From day 20 onward， the average body weight in powder soft diet group was significantly higher than that expanded diet group （P<0.05）， while showing no significant difference from iced trash fish group （P>0.05）. In terms of feeding rate， the expanded diet group was significantly lowest （P<0.05）， while there was no significant difference between the iced trash fish group and the powder soft diet group； （2）In terms of the percentage change of gastric contents after feeding different diets， the gastric evacuation rate was the fastest when feeding powder soft diet， followed by iced trash fish， and the slowest when feeding expanded diet， with the square root model providing optimal fit for all dietary groups. （3） In terms of the theoretical 50% and 80% gastric evacuation times， the gastric evacuation time of the powder soft diet group was the shortest， the iced trash fish group was the second-longest， and expanded diet group had the longest time， the 80% gastric evacuation time was 10.43 h， 11.29 h and 11.44 h， respectively； （4）Live digestive enzymes displayed an "M" type variation trend over time across all diets， while intestine digestive enzymes exhibited initial increase followed by decline. Chymotrypsin and amylase activities in both tissues showed positive correlations with substrate concentrations in respective diets. These results suggest that the physical properties of expanded diets （e.g.， high hardness and delayed softening） may delay gastric evacuation， thereby reducing feeding rate. Coupled with its suboptimal protein content， these factors collectively constrain the growth potential of Takifugu flavidus. This study highlights the urgent to carry out research on the optimal protein requirements of Takifugu flavidus， and further optimize the expanded diet formula to improve the digestion and utilization efficiency.