I am located in Nigeria,

I admit, I was trying to bring up the issue of region. One should expect to see different fish in different regions.

The term "salmon" is usually refers to an order of cold water fish. One can find salmon the Atlantic. Historical documents note that the "Atlantic Salmon" was not found in the Mediterranean or Southern Hemisphere.

The most abudant salmon is found in the Pacific Northwest ... which is essentially on the opposite side of the world from Nigeria.

Nigeria has warm waters.

So, I decided to look up common fish in Nigeria. There is a species of ray-finned makerel in Nigeria in the Scombridae family. This fish is sometimes called Titus. Apparently some people in Nigeria call it "salmon" as it looks a bit like salmon.

This report from the FDA says that scombrotoxin poisoning is due the high level of histamine in the Scombroid order of fish. Please note, the disease is named after the type of fish.

This report from the World Health Organization examines the histamine levels of fish in the Salmon family.

The report from WHO says: "scombroid fish [...] have
free histidine levels ranging from approximately 5 000 mg/kg to 20 000 mg/kg." The report then says "most species in the Salmonidae family have less than 1 000 mg/kg histidine. Thus most members of the Salmonidae family have somewhere between 10 and 200 times less free histidine than scombroid fish."

This forum post confirms that people in Nigeria call the Titus makerel "salmon." Titus is a Scombroid so it is is a likely source of scombroid toxin. Since salmon is a cold water fish there should be no local name for it.

It is possible that you got Scombrotoxin poisoning from eating Salmon; however, since there is a makerel sold in Nigeria as "salmon," it is possible that you had a Scombroid fish that was misidentified as salmon.

You could tell by learning the region of the fish. Was the fish caught in the North Atlantic or Pacific. If it was locally caught it most likely was a Titus (a member of the scombroid family) and was not a salmon.

I aslo asked if it was farmed raised. Salmon are not well suited to farms and are more prone to diseases than wild caught salmon.

BTW, people in the United States are notorious for mislabeling foods. We call bison "buffalo," we call sweet potatoes "yams." We call juniper "cedars" and so forth. This problem shows up a lot in international forums. Whenever a discussion about food arises, one has to be careful to report the region.