UF/IFAS Circular 716 Introduction to Freshwater Fish Parasites.




Gill flukes (Dactylogyrus) will appear on the gill filaments as tiny dark spots 0.04-0.08 inches (1-2mm) long.
Gill flukes can infect freshwater and saltwater fish and are found on fish from the wild as well as farmed fish.

These parasites attach to the gills of the fish and feed on mucus, epithelial cells (cells that line the inside of gills and perform the tasks of secretion, absorption, protection, and transcellular transport), and blood from the host.

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It is noteworthy that 100% positive identification with the naked eye is impossible.
Other than scraping the gills (which can be fatal to the fish) and then preparing a slide, your best recourse is an "educated guess" based on redness in the gills (which can be other issues too such as ammonia poisoning burns), and scraping of the fish against objects in the aquarium or pond in the area of the gills.

Fish tapeworm infection is an intestinal infection with the tapeworm parasite found in fish.

I remember seeing this parasite one time while fishing in the San Francisco Bay. I caught a Croker (kingfish) and while pulling the fishing hook, saw this hard shelled bug in there too.

UF/IFAS Fact Sheet VM-77 Use of Formalin to Control Fish Parasites.

Coccidians in mammals and birds evidently derive from parasites of fish. There are over 50 helminthic infections from fish/shellfish (i.e. parasites thatparasitizes the human gut) that can infect humans. How do we avoid becoming a"victim". Well for most the answer is just cook your fish (however otherproblems may still occur-see below). However for others, especially those who love sashimi(like me!) there are a couple of precautions you can take. I will discuss these a littlebit later. Luckily most parasitic infections from ocean fish are rare. Pelagic fishes,such as tuna probably have the least amount of parasitic load. This is mainly due to theirwide roaming migrations. This is because tuna, who are near the top of

UF/IFAS Circular 716 Introduction to Freshwater Fish Parasites.

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:

UF/IFAS Fact Sheet VM-77 Use of Formalin to Control Fish Parasites.


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:Almost all groups of animals and plants contain at least a few parasites. Parasites are a group of organisms that may or may not cause illness in pet fish, depending on a number of factors. The fish infected with a parasite is called the host. Before we learn about the different fish parasites, let's find out exactly what a parasite is.