It’s February and soon spring will be here. Spring is my favorite time of the year but, unfortunately, it is the most crucial time for our koi and goldfish. During winter and cold weather our finny friends go dormant. They are cold-blooded so, as the water temperature drops, their metabolism slows down. They do not eat (and should not eat in water temperatures under 50°) and just hover on the bottom of the pond. The most concerning effect cold water has on pond fish is that they lose their immunity systems and are weak from not eating. As warmer weather approaches they will become more active but will not fully regain their immunity systems until water temperatures reach 70°.