. Commercial fisheries review. Fisheries; Fish trade. 40 Only about one of every six boats is a full-time trawler. The others divide their fishing timebetweentrawling and other types of fishing--chiefly seining for pelagic fish. The full-time trawlers are smaller vessels (under 100 hp.) built between the two world wars. They operate in the canals betweenthe larger islands but, even there, they are often blown intoport by adverse winds and so aver- age only about 150 fishing days per year. Of the larger boats (over 100 hp.) that divide their fishing time between trawling and other types of fish
. Commercial fisheries review. Fisheries; Fish trade. 40 Only about one of every six boats is a full-time trawler. The others divide their fishing timebetweentrawling and other types of fishing--chiefly seining for pelagic fish. The full-time trawlers are smaller vessels (under 100 hp.) built between the two world wars. They operate in the canals betweenthe larger islands but, even there, they are often blown intoport by adverse winds and so aver- age only about 150 fishing days per year. Of the larger boats (over 100 hp.) that divide their fishing time between trawling and other types of fishing, only every tenth boat fishes intensively in the open sea areas. The others fish either inside or outside, but not exten- sively. Crews range from seven to eight men for the larger vessels, upward from 25 , but are five or less for the smaller boats working in the canals. Trawlers now take 1,000-1,600 metrictons annually. The main trawling area is the Blitvenica grounds (fig. 1). By agreement, part of this area is allocated to Italian fish- ermen. The Yugoslavs are reexamining this agreement, however, in light of their own de- clining catches. (For details, see CFR, July 1969, page 47.) Open-Water Area Although this area is by far the largest in terms of sea surface, scarcely one-half of it contains significant fish populations. Fur- thermore, fish in that one-half are not uni- formly distributed: they are fairly abundant on some grounds but scarce in others. Of the about 200 commercially important species in the Adriatic, only about 14 are found in the open-water area. Yet this small number makes up three-quarters of the com- mercial catch. Important species are: sar- dine (Sardina pilchardus). sprat (Clupea sprattus), anchovy (Engraulis encrasicholus), Atlantic mackerel (Scomber scombrus), chub mackerel (Scomber japonicus colias), Atlantic saury (Scomberesox saurus), gar-fish, horse mackerel (Trachurus spp.), bluefin tuna (Thunnus thynnus), Atlantic bonito (Sarda sarda
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