Two New Goby Fish Species Discovered and Lost in Red Sea
Researchers identified a rare pygmygoby species that has vanished since its initial 2023 discovery.
1Rare Discovery Near Walih Island
On May 15, 2023, researchers from King Abdullah University of Science and Technology collected two small gobies near a cave off Walih Island, Saudi Arabia. Found at a depth of 98 feet, these specimens were later identified as a new species, Trimma charon, in a September 2026 scientific publication.
2Mythological Naming and Appearance
The fish features a translucent body with an orange-red stripe and golden spots on its tail. These spots resemble coins, leading researchers to name the species after Charon, the Greek mythological ferryman who transported souls across the Styx. The iris is uniquely divided into four distinct white and orange sectors.
3Specimen Preservation and Cataloging
The two collected fish, measuring 16.8 and 12.1 millimeters, are now housed at the Royal Ontario Museum. While the larger holotype defines the species, researchers noted that the vibrant body colors faded significantly after preservation. Only faint traces of the original eye patterns remained visible in the preserved museum specimens.
4Genetic Analysis and Comparisons
Genetic testing using the COI mitochondrial gene revealed an 85 to 86 percent match with Trimma anaima, a related pygmygoby found elsewhere. This genetic gap suggests a long evolutionary presence in the Red Sea. The species is distinguished from its closest relative by having 14 rays in each pectoral fin.
5The Mystery of Disappearance
Despite extensive follow-up surveys along the Saudi Arabian coast, no additional specimens have been located since the initial dive. The team utilized hand nets and clove oil during their search, yet the fish remains elusive. This total absence after the discovery raises questions about the species' true population density.
6Depth as a Potential Factor
The researchers suggest the fish might inhabit deeper mesophotic reefs, which exist below the 98-foot limit of their standard diving operations. The steep reef slope at Walih Island drops past 328 feet, potentially hiding a larger population. Current scientific surveys in the region rarely reach these deeper, unexplored underwater zones.
7Red Sea Biodiversity Context
The discovery of Trimma charon increases the number of known Trimma species in the Red Sea to 11. These bottom-dwelling gobies are ecologically significant, as they provide nearly 60 percent of the food consumed by other reef fish. This genus is now considered the most species-rich goby group in the area.
8Implications for Marine Exploration
This case highlights the challenges of documenting biodiversity in undersampled deep-reef environments. While the Red Sea is well-studied, the lack of deep-water access limits comprehensive biological data. Future research must prioritize exploring these dark, deeper habitats to determine if the species is truly rare or simply living beyond reach.
Original article: Earth.com — Two New Goby Fish Species Discovered and Lost in Red Sea