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The narrow strait at Middelfart creates a natural funnel for tidal currents, which concentrates fish and nutrients in a relatively small area. Harbour porpoises, Denmark's only native cetacean, gather here to feed on the abundant fish brought in by the currents. The area hosts one of the densest concentrations of harbour porpoises in European waters, with populations peaking during the summer months when fish are most abundant.

Currents at Middelfart can be very strong, sometimes exceeding two knots during peak tidal flow. Diving must be carefully planned around tide tables, with slack water periods offering the calmest conditions for less experienced divers. Many divers specifically choose to dive during moderate current periods for drift diving, entering upstream and letting the current carry them through the strait. A surface marker buoy is essential, and diving with a local guide familiar with the current patterns is strongly recommended.

While harbour porpoises are present in the area year-round and in large numbers during summer, underwater encounters during dives are not guaranteed. Porpoises are fast-moving and can be shy of divers. However, surface sightings are virtually guaranteed during summer months. Underwater encounters are most likely during drift dives when the current matches porpoise feeding behavior. Snorkeling in shallow areas can also provide excellent encounters as porpoises sometimes feed very close to shore.