Rare Black Sea Salmon Discovered in the Danube: Researchers to Study the Species’ Origin and Migration Links

During a fisheries protection raid on the Danube River, specialists recorded a rare discovery: a Red Book-listed Black Sea salmon (Salmo labrax) weighing 3.9 kg. The finding is of considerable scientific importance, as current data on the status of this species’ population in Ukrainian waters remain limited.

The discovery was reported by the State Agency of Ukraine for the Development of Land Reclamation, Fisheries and Food Programmes.

Experts from the Black Sea Department of the Institute of Fisheries, Marine Ecology and Oceanography of the State Fisheries Agency (IFMEO) took part in fisheries protection measures conducted by the Odesa Fisheries Protection Patrol and the State Border Guard Service of Ukraine.

During the raid, the Black Sea salmon was discovered in one of the commercial fishing gears. The finding is particularly significant because it was recorded during the spawning period, when the study of the fish’s migratory behaviour may provide additional information on the condition and structure of its population.

IFMEO researchers carried out a comprehensive biological analysis of the specimen. They determined its morphometric and meristic characteristics, established the fish’s sex and age, and collected tissue samples for further molecular genetic research.

Genetic analysis will help clarify the taxonomic status of the specimen, its origin and its possible migratory links with other populations of the species in the Black Sea basin. The findings are expected to be compared with data from European research databases.

“Black Sea salmon is one of the least studied representatives of the salmon family in the region. It is extremely rare for this species to appear in catches. Therefore, every recorded case is important for understanding the current status of the population and developing measures for its conservation,” said Ihor Klymenok, Head of the State Fisheries Agency.

The research findings will contribute to the national database on the distribution of Black Sea salmon and will be used in further studies focusing on the biology, migration patterns and conservation of this valuable fish species in Ukrainian waters.

Comment by the Institute for Danube Research

Experts from the Institute for Danube Research emphasise that the occurrence of a rare species in the Danube is not only an important scientific event, but also further evidence of the river’s unique natural potential.

The Danube is not only a strategic transport corridor, but also a complex cross-border ecosystem that requires systematic attention and protection. The discovery of the Black Sea salmon confirms that even a single recorded specimen can provide researchers with valuable information on biodiversity, migration processes and environmental changes in the river basin.

The protection of the Danube’s biodiversity undoubtedly requires a combination of scientific monitoring, effective fisheries protection measures and stronger cross-border cooperation between Ukraine and other countries of the river basin.

“Research into rare species should become part of a broader environmental monitoring system. Ukraine should develop data exchange with European research institutions, support molecular genetic studies and establish common approaches to the conservation of aquatic biological resources in the Danube region,” the Institute stated.

The Institute for Danube Research also notes that cooperation between researchers, border guards and fisheries protection authorities is essential for preserving the Danube’s natural diversity and combating the illegal harvesting of aquatic biological resources during the spawning period.