Pedrinha

Pedrinha appears in the first 3D mapping of the park's seabed among the spots used as dive sites. The park's reefs were old fishing grounds, and fishermen call the area's rock formations "riscas" or "cabeços"; since the park lies in the central portion of them, it was named Pedra da Risca do Meio. The submerged reefs between Fortaleza and Icapuí are thought to be former river channels or valleys, transformed by the marine regression of about 18,000 years ago, in the Upper Pleistocene. The park's reefs lie far from the coast, outside the influence of nutrient runoff and estuarine sedimentation, and turbidity comes mainly from sediment resuspension by the waves.

131 fish species have been recorded in the park, six of them endemic to Brazil and 13 included in threatened species lists. The park and the coast of Ceará are home to threatened or emblematic species such as the Atlantic goliath grouper, queen angelfish, nurse shark and spiny lobsters. The presence of the invasive lionfish (Pterois volitans) in the park area was confirmed in 2023.

In Fortaleza, the most favorable months for diving tend to be January to June, a period with little wind. On the Fortaleza coast, strong winds and swell tend to make the water murky in the second half of the year, from August to December.