Lost for 90 years: Rare Goby resurfaces in Jaffna

For nearly 90 years, a small fish known as the Yellow-stripe Goby (Mugilogobius chulae) was missing from Sri Lanka's scientific records. Recently, researchers rediscovered the species while conducting a biodiversity survey in Jaffna. The discovery was made during a detailed examination of an unidentified Goby found in the Karainagar area of Karaitivu Island. The Yellow-stripe Goby had previously only been documented in Sri Lanka through a single specimen collected from Pedduru Thuduwa in Jaffna in 1936.

The rediscovery of the Yellow-stripe Goby highlights the rich, unexplored aquatic biodiversity found in the Northern Province of Sri Lanka. For decades, the region remained relatively unstudied due to the civil conflict, restricted access, and security concerns. This made it difficult for researchers to systematically investigate the aquatic habitats in the area.

The discovery of the Yellow-stripe Goby, along with the Black-spotted Snubnose Goby (Pseudogobius melanostictus), demonstrates the importance of returning to these habitats and conducting detailed surveys.

The findings of the research team underscore the potential for more species and range extensions to be discovered in northern Sri Lanka. Small and often overlooked coastal, tidal, and inland aquatic habitats can hold significant biodiversity. The rediscovery of the Yellow-stripe Goby reconnects modern Sri Lankan ichthyological research with the work of renowned zoologist P. E. P. Deraniyagala, who first described the species in 1936.

It also establishes the westernmost known occurrence of the species in the Indian Ocean. The researchers emphasize the need for continued biological surveys in northern Sri Lanka, as the aquatic ecosystems in the region remain poorly studied, particularly in areas that were inaccessible or difficult to investigate for extended periods.