Untitled - CNR

Marine research at CNRFigure 1: Design of the trawl adopted for the study during the first (30/08/04 - 07/09/04)and second sea trials (22/09/04 - 06/10/04).meshes) having nominal mesh size (ms)of 40 mm and a fractional mesh opening(fmo) of 0.25. Therefore, the actualfishing circumference (afc) is: acf =0.25*40*280=2800 mm. To find out thenumber of meshes of the square-mesh codend(nms) to match at such circumference,it is enough to divide it by the nominalsquare-mesh size (or bar): nms =2800/20=140 meshes.2.2 Sea trials and gear behaviourperformanceSamplings were conducted on the Italianresearch vessel RV “Andrea” (1350x2 HPat 2300 rpm; length over all 29.15 m andGross Tonnage 285 GT). Sea trials werecarried out in the course of two subsequentfishing cruises on two different fishinggrounds of the Central Adriatic normallyexploited by local fishermen. Thefirst cruise took place from 30/08/04 to07/09/04 at about 15-21 m of depth, approximately5 nm off Ancona, and the secondfrom 22/09/04 to 06/10/04 in the Ortonadepression also named Western Pomopit, at a depth of about 70 m.The two codends were alternated daily onthe same trawl. Commercial practice wasfollowed with regard to trawling speed andtow time.1859