Accidental catch in the Mediterranean: Scientists intrigued by 'mysterious' shark populations

A young great white shark was accidentally caught off the eastern coast of Spain on April 20, 2023. The specimen measured approximately 210 centimeters and weighed between 80 and 90 kilograms. Although the great white shark, scientifically known as Carcharodon carcharias, is one of the most well-known marine species, encounters with this particular shark in this part of the Mediterranean Sea are exceptionally rare, according to reports. This incident prompted scientists to review historical records spanning from 1862 to 2023. Their findings, published in the journal Acta Ichthyologica et Piscatoria, suggest that great white sharks have not disappeared from the Mediterranean, even though they are seen very rarely. Researchers refer to this elusive population as “ghostly,” highlighting their mysterious presence in the region. The great white shark is listed as vulnerable on the International Union for Conservation of Nature's Red List, and its population is believed to be declining. As such, each new observation is valuable for monitoring the species. This discovery adds to the growing body of evidence about the shark’s continued existence in the area, despite its rarity. The significance of this case lies in the fact that the captured individual was a juvenile. Dr. José Carlos Báez, who led the study, emphasized the importance of identifying young individuals. “Determining the presence of juveniles is extremely important. Their appearance raises the question of whether reproduction is still occurring in this region,” he said. Historical data indicate that great white sharks have occasionally appeared in the Spanish portion of the Mediterranean over the past 160 years. Given their ability to travel vast distances, each confirmed sighting helps scientists understand their distribution patterns better. Dr. Báez believes these studies can help dispel many myths surrounding this species. “A better understanding of the biology and ecology of the great white shark is the best way to replace unfounded myths with real knowledge,” he stated. Great white sharks play a crucial role as apex predators in maintaining the balance of marine ecosystems. As highly migratory creatures, they transfer energy and nutrients over large distances and feed on both prey and carrion, contributing to the health of the ocean. “ I want to convey to the public that these large marine animals play a key role in the functioning of marine ecosystems,” concluded Dr. Báez. While this new discovery does not confirm that great white sharks are reproducing in the Mediterranean, it suggests that this enigmatic population has likely not yet vanished. Scientists continue to monitor and study these rare occurrences to gain deeper insights into the life and behavior of these fascinating creatures.