FISH TAPEWORMGroup of answer choicesTaenia soliumDiphyllobothrium latumHymenolepis nanaTaenia saginatta

The fish tapeworm is primarily identified as Diphyllobothrium latum. This species of tapeworm is known to infect fish and can be transmitted to humans when they consume raw or undercooked fish containing the larval form of the parasite.

Here's a brief overview of other options for clarity:

1. Taenia solium - commonly known as the pork tapeworm, which primarily affects humans who consume undercooked pork.
2. Hymenolepis nana - known as the dwarf tapeworm, which is primarily associated with rodents but can also infect humans.
3. Taenia saginatta - referred to as the beef tapeworm, typically found in cattle and can infect humans who consume undercooked beef.

Therefore, out of the choices listed, Diphyllobothrium latum is the correct answer for fish tapeworm.