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Unlike mammals, the red blood cells of fish have DNA, and can become infected with viruses. The fish develop pale gills, and may swim close to the water surface, gulping for air. However, the disease can also develop without the fish showing any external signs of illness, the fish maintain a normal appetite, and then they suddenly die.
Mackerel is an important food fish that is consumed worldwide. [3] As an oily fish, it is a rich source of omega-3 fatty acids. [4] The flesh of mackerel spoils quickly, especially in the tropics, and can cause scombroid food poisoning. Accordingly, it should be eaten on the day of capture, unless properly refrigerated or cured. [5]
Scombroid food poisoning, also known as simply scombroid, is a foodborne illness that typically results from eating spoiled fish. [ 2 ] [ 4 ] Symptoms may include flushed skin , sweating , headache , itchiness , blurred vision , abdominal cramps and diarrhea .
Gyrodactylus salaris, commonly known as salmon fluke, [1] salmon killer, or the Norwegian salmon killer is a tiny monogenean ectoparasite which lives on the body surface of freshwater fish. [2] This leech-like parasite has been implicated in the reduction of Atlantic salmon populations in the Norwegian fjords . [ 3 ]
Ciguatera fish poisoning (CFP), also known as ciguatera, is a foodborne illness caused by eating reef fish contaminated with ciguatoxins. [ 4 ] [ 2 ] Such individual fish are said to be ciguatoxic . Symptoms may include diarrhea , vomiting, numbness, itchiness, sensitivity to hot and cold, dizziness , and weakness.
The term "coarse fish" is used in the United Kingdom to describe all fishes besides trout and salmon, but it is not a derogatory term.[2]The Minnesota Department of Natural Resources has made preliminary efforts to replace the term "rough fish" with "underused fish", [3] like some other state agencies have actually done, [4] but this has remained an incomplete effort in Minnesota.
The white spots may reach more than 1 mm in diameter and are easily recognized on skin and fins whereas trophonts attached to the gills are hard to see due to the gill cover . Skin: Ich infections are usually visible as one or several characteristic white spots on the body or fins of the fish. The white spots are single cells called trophonts ...
The fish responds by walling off the parasitic infection into a number of cysts that contain milky fluid. This fluid is an accumulation of a large number of parasites. Henneguya and other parasites in the myxosporean group have a complex lifecycle where the salmon is one of two hosts. The fish releases the spores after spawning.