sera guide - Healthy pond fish

Cause: Acute nitrite intoxication Treatment: page 40 Observation Fish become apathetic and die suddenly in spite of beau- tiful colors, often without other outer disease symptoms; Koi jump above the water surface. 22 Cause: Osmotic shock Treatment: page 39 Observation Mucous membrane comes off, fins fall off. Cause: Alkalosis or ammonia intoxication Treatment: page 38 Observation Whitish skin slime; frayed fins; gill filaments dying off. 4 Maintenance mistakes and intoxications Damaged gills after an ammonia intoxication (gill lid removed)