springday

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°.

You may have to replace your bulb. Bulbs in UV’s have an effective usage life of 9 to 12 months. If you unplugged your UV during the winter months you extended it’s life. As a rule of thumb, a UV’s lamp should be replaced every year. The bulb loses power as it burns, therefore, it may still be lit but operating at 20% of its original power, rendering it ineffective for the purpose of killing algae. You’ll know when you need to replace your lamp simply by noticing that your UV is no longer clearing up the free-flowing algae.

Early spring is the perfect time to clean and perform maintenance on your biological filter. During winter the water is too cold for nitrifying bacteria to live and they go dormant. As water temperatures heat up nitrobacter and nitrosomonas, the two “good” bacteria begin to colonize. If you clean your filters with chlorinated water the chlorine can prohibit the growth of these two beneficial bacteria — especially nitrobacter which, of the two, is the slowest to grow.