Take another look at the passage:

Marina, the beautiful mermaid, wanted some tuna salad. But had a small problem since she was allergic to celery. At Sammy’s Sub Shop, Marina hoped to find tuna salad free of this dangerous vegetable. Flopping across the tiled floor to the counter. Marina placed her order and then checked her sandwich for celery. Not noticing, however, the spoiled mayonnaise. At five o'clock that evening, Marina became violently ill with food poisoning. When a lifeguard at the beach discovered the problem, he called 911. Even though the mermaid had fishy breath. A handsome paramedic gave her mouth-to-mouth resuscitation. Wailing like a sick dog, the ambulance sped off to the hospital. Where the doctor on call refused to treat a sea creature with a scaly tail. A kind nurse, however, had more sympathy. After she found some Pepto-Bismol. Marina drank the entire bottle of pink liquid, feeling an immediate improvement. The mermaid told the rude doctor never to swim in the ocean. For she would order hungry sharks to bite off the doctor's legs. While sharp-clawed crabs plucked out his eyes. Tossing her long hair, Marina thanked the nurse for the Pepto-Bismol. And took a mint from David, the handsome paramedic.

A fragment will not contain a main clause. A main clause follows this pattern:

Subject + Verb = Complete Thought.

In the highlighted item, Marina is the subject, and wanted is the verb. This pair makes a complete thought, so you do indeed have a main clause here. This item is a sentence, not a fragment.

Go to the next sentence.

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