Large dark 'worms' attached to the fishes body are visible with the naked eye Smalll clear disc-shaped up to 1 cm diameter can be seen with the naked eye.įish Lice (Argulus) A crustacean posiible visible with the naked eye. A microscopic wormįlashing, swimming erratically. Sluggishness, flashing, spider web lesions on skin, reddened fins, clamped finsīody Flukes (Gyrodactylus). Patches of bluish/white film on body, small reddish lesionsĬostia (Ichthyobodo necatrix) A microscopic parasite (Tichodina sp) A microscopic protozoan parasite (Chilodonella cyprini) A microscopic protozoan parasiteįish are lethargic, sitting on bottom, gasping or breathing heavily, flashing, small reddish lesions White film covering most or all of the body, gasping or heavy breathing, fish are lethargic sitting on bottom (Lernaea) A crustacean parasite visible with the naked eye. Thread-like worms hanging from skin, small pimples White spots on body and fins resembling salt, fish scratching, clamped fins, cloudy eyes and fins It’s always a good idea to take count of your fish at feeding time and also take a close look them while they are close to the surface. Depending on the situation, disease can spread to many or all fish in the pond relatively quickly. Recognizing the first signs of disease is important because it can be controlled much more easily if it is caught early. If this fish doesn’t eat, it’s a sure sign that something isn’t right. The first sign of a problem usually starts with one fish that segregates itself from the rest of the school, often hanging listlessly near the surface of the water. There are several ‘early warning signs’ that indicate that your fish may be under attack from parasites or bacteria.
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