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An important aspect of the operation of every ship is navigational safety, particularly on the open sea. This aspect becomes more important in fishing vessels, which, unlike other ships loaded in the port, are loaded by working on open sea, off the coast, often in severe weather conditions. Currently, there are a large number of vessels in the fishing fleet, poorly equipped with reference to the technical documentation required, which are unaware of the vessel's stabilizing behaviour condition and which therefore get classified by the Albanian Shipping Register. In this paper, the author will present a case study concerning the stability analysis of a fishing vessel operating in Adriatic and Ionian Seas. Once the measurements for determining the ship's offsets have been carried out, geometric modelling of fishing vessel hulls in CAD software is done as well as the verification of intact stability criteria using the stability software. This procedure would be very useful for other similar cases. Several considerations have been given for three types of stability loss: dead vessel conditions, broaching to and variation of righting arm, including pure loss of stability and parametric roll.