The Growth of Xiphophorus hellerii is Negatively Correlated with Colony Density

Xiphophorus fishes serve as important animal models in biomedical research. To investigate colony density influence on growth, we compared 6-, 9-, and 12-month-old fish raised in low- (1 fish/2L), mid- (1 fish/L), and high-density (2 fish/L) in re-circulating aquariums. As expected, the results indicate that fish reared in low-density aquariums exhibit the greatest growth, and fish reared in high-density aquariums result in the least growth.