Retailers often discount stock at the "end of the season" (August/September) to empty tanks before winter. Sites like Fishkeeper.co.uk note that these fish are often larger and hardier after a full summer of growth. Critical Temperature Thresholds
The optimal time to buy and introduce pond fish is , specifically when water temperatures consistently stay above 15∘C15 raised to the composed with power C 60∘F60 raised to the composed with power F best time to buy pond fish
As temperatures stabilize, fish metabolism increases, making them more resilient to the move. Experts at Aquatic Veterinary Services recommend this period because fish are less vulnerable to pathogens than in early spring when temperatures fluctuate. Retailers often discount stock at the "end of