N. Yordanov
Department of Animal husbandry – Non-ruminant animals and special branches, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria

(Manuscript received 15 January 2026; accepted for publication 20 February 2026)

*Corresponding author: nelko1305@gmail.com

Abstract. The invasive blue crab (Callinectes sapidus) continues to expand its range along the Bulgarian Black Sea coast, including areas with active aquaculture. This study provides the first documented evidence of C. sapidus in the vicinity of the “Dalboka” mussel farm, which is located to the north of Kavarna, Bulgaria. On 19th and 20th October 2025, a total of two male specimens were recorded. These specimens were captured using a traditional Black Sea pound net (talyan) and recorded into the official fishing log of the farm. Despite the fact that the numbers are low, these observations indicate a northward expansion trend of the species. The paper discusses potential ecological and economic impacts on mussel production and proposes monitoring and management recommendations.