The shares of First Investment Bank (Fibank) [BUL:5F4] led the blue-chip gainers' list on the Bulgarian Stock Exchange on Tuesday, after gaining 2.56% and closing at 4.0 levs.The blue-chip SOFIX index, which tracks the 15 most liquid and capitalised stocks on the BSE, ended the session 0.43% higher at 632.77 points.Diversified group Doverie United Holding [BUL:5DOV] paced the blue-chip decliners on Tuesday, closing 3.29% lower at 1.615 levs.Car battery maker Monbat [BUL:5MB] was the most traded blue chip during the trading session, as 37,003 shares in the company changed hands, forming a turnover of 286,776 levs.Total trading turnover on the Sofia bourse fell to 454,200 levs ($267,973/232,229 euro) on Tuesday from 655,800 levs on Monday.The wider BGBX40 index, which tracks the 40 most traded shares on the Sofia bourse, rose 0.67% to 122.45 points.The BGREIT index, which tracks the performance of real estate investment trusts, added 0.1% to 117.20 points on Tuesday.The BG TotalReturn30 index, in which companies with a free float of at least 10% have equal weight, increased 0.28% to 520.99 points.(1 euro = 1.95583 levs)