Q. Does deep-freezing fish kill harmful parasites?

NOVA put together , embedded below, about one of those animals that you have to keep persuading yourself is real, a parasitic crustacean that lives inside the mouths of fishes, eating–and then taking the place of–its host’s tongue.

Target Tissue: provides the location on/in the fish where the parasite is most commonly found.

When it comes to treating fish parasites, there are some medications commercially available that work well. Others can only be prescribed by a veterinarian. Drugs or chemicals placed in the water are commonly referred to as "bath" treatments. Drugs delivered orally are generally mixed in the food, and are meant to deliver systemic effects. Injections may be utilized for cases in which small numbers of fish are involved. Bath treatments are the most variable, in that a specific concentration of the chemical is placed in the water for a specific length of time. As a rule, lower concentrations are used for longer periods of time and vice versa.

Common Freshwater Fish Parasites Pictorial Guide: Sessile Ciliates

UF/IFAS Fact Sheet FA-107 Common Freshwater Fish Parasites Pictorial Guide: Sessile Ciliates. This publication is one in a series of pictorial guides that is designed to assist in the identification of common freshwater fish parasites. The publications included in this series are:

Common Freshwater Fish Parasites Pictorial Guide: Motile Ciliates

Stefanie Rock purchased the package of cod and salmon from the Costco in Manteca two days after Christmas. She told KCRA her family discovered “at least two” parasites in one of the fish filets.

Common Freshwater Fish Parasites Pictorial Guide: Monogeneans


Just like any other creature, your fish can suffer from disease and parasites. When fish have parasites they are very contagious. If a fish actually has parasites, it's highly recommended to separate the fish in question from all the other aquatic life in your fish tank. Taking the fish out of the aquarium into a portable container is probably the best way to do so. Otherwise the parasites will most likely spread through the whole fish tank until all fish are infected. Below is a list of seven parasites that are common among tropical fish: Anchor worms – these parasites are females and have an anchor shaped head, which they use to burrow its way into the flesh of its prey. Once they bury themselves into the fish there may be a little bit of bleeding on the fish where the head has attached itself. You may also be able to see a little worm or tentacle that is white protruding out from the spot where the parasite is attached. Because this parasite’s head is anchor shaped it is difficult to remove, and if pulled out by force may cause the fish to suffer a bleeding wound.