Using a Fish Diagnostic Tool in a Saltwater Aquarium

Let's learn about "Saltwater aquarium". according to Wikipedia

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When one or more of the fish in your saltwater aquarium start acting or appearing "strange," it's time to conduct some research to figure out what's wrong. Most marine fish ailments or afflictions may be rectified and healed if identified, diagnosed, and treated early on.

Check out this list of possible symptoms to aid with the diagnosis. It might assist you in focusing on a diagnosis and initiating therapy as soon as possible. The best course of action for therapy is to use a quarantine tank. If other residents in your tank exhibit the same symptoms, the entire tank should be treated.

Keep in mind that many fish illness treatments can impair your tank's biological filter, so you should take efforts to limit their impact on your system's "good bacteria."

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    No Appetite

    When something goes wrong with a marine fish, it is stated that the first thing to disappear is their hunger. In most cases, a lack of appetite in marine fish is the first sign of a more serious disease. Because of their new surroundings and/or shipping stress, it is not uncommon for a fish to not eat for the first day or two after being introduced to a new aquarium system, but they should begin eating after that. To persuade your finicky eaters to start eating, use these ideas on in your marine aquarium.

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    White Dots on a Fish's Skin or Fins

    This is a symptom of marine parasites including Cryptocaryon (marine white spot disease), Oodinium (marine velvet, coral reef fish illness), and Brooklynella (Brooklynellosis or anemonefish disease), which might be difficult to see. Because the treatments for various disorders varies, it is critical to correctly identify the parasite before choosing a medication.

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    An infection in the eye causes Popeye (an enlarged and bulging eye that protrudes from its socket). A scratch, abrasion, or other damage to the eye that has gotten infected with bacteria in the surrounding water is the most common cause.

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    Cloudy Eyes

    A caused by an injury to another area of the fish might cause cloudy eyes. The bacterium enters the fish's body and then spreads to the eyes, resulting in the foggy look.

    Bacteria can enter the aquarium system as a result of poor environmental conditions. Even the healthiest of fish may be overtaken by germs if the conditions are bad enough. This condition can be identified by white hazy water and the development of sores on the fish.

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    Frayed Fins

    Ammonia burns, which have literally "burned" the outside margins of the fins, are a common cause of frayed fins in fish. This infection is treated in the same way as other infections.

    Frayed fins can also be due to a bacterial infection caused by Flavobacterium columnare. This bacterium can cause a fuzzy appearance to the skin or fins, similar to a fungal infection.

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    Rapid Gilling

    Rapid gilling (increased operculum movement caused by rapid breathing) indicates that the fish is not obtaining enough oxygen. This can be induced by excitement, exertion, or mucus clogging the fish's gills, which prevents the gills from performing gas exchange (suffocation). If the fish is swimming regularly or resting and gills are quickly gilling, it is an indication that the gills have been injured by excess mucus caused by bacteria, parasites, or pollutants in the water such as ammonia or chlorine.

    Parasites stuck in the gills irritate the fish's immune system, which responds by producing additional mucus to protect the gill membrane. As soon as possible, treat the fish for the parasite in question.

    An overabundance of ammonia in the packing (shipping) water or aquarium water is another common cause of fast gilling. While fish and invertebrates can tolerate a certain (low) quantity of ammonia (a poison), larger levels can "burn" (irritate) the gills, leading them to generate more mucus as a defense, preventing them from taking in oxygen.

    High levels of ammonia can also cause other problems with saltwater fish such as ragged, frayed or burnt fins and/or bacterial infections.

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    Open Sores

    Open sores (raw areas) on a fish are often the consequence of a parasite infection that has caused bacteria to invade holes in the skin. For any bacterial illness, the therapy is the same.

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    Red fins

    Red fins on a fish usually indicate an internal bacterial infection caused by ammonia burns, skin parasites or trauma that has allowed bacteria to enter the body and spread.

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    Faded Colors

    A fish's faded hues might be due to anything as simple as the fish acquiring its evening coloration, or they could be an indication of something more serious. When these are not the fish's evening hues, faded colors are frequently observed in combination with other symptoms.

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    Bloating or Abdominal Swelling

    Swelling or bloating in the abdomen is frequently an indication of a kidney infection that limits regular fluid removal from the body, which is a common issue in that burrow in the substrate. Swelling or bloating can occur when fish are gathered in the wild from deep water and brought to the surface due to "bends" (lack of decompression) produced by bringing a fish up from deeper waters too soon.

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    Scratching on Rocks

    Scratching or rubbing against rocks or other things (including the substrate) indicates that a fish's skin is irritated, and the fish is attempting to remove the irritating substance. The light hue of the fish's belly becomes evident when they brush their sides against the rocks, which is known as "flashing." Cryptocaryon (marine white spot disease) or Amyloodinia are the most common causing organisms ( Oodinium , marine velvet, or coral reef fish disease).


"Got A Sick Fish?American Veterinary Medical Association, 2020", "Fish disease and human health. Government of Western Australia, 2020", "Do Fish Get Sick?. Aquatic Veterinary Services, 2020", "Signs Of Illness In Fish. Arizona Exotic Animal Hospital, 2020";