Mali Ston Bay - Adriatic pearl

摘要

Investigations carried out in Maloston Bay in the 1963. – 1965. period; in the 1967/68; 1970. – 1976., and the 1980./1981. period as well as the recent research done between May 2000. and March 2002. showed all the complexity of this bay, shallow and closed and thus protected from the sea waves displaying at the same time a series of specific ecological factors which influenced its bio-world, their quantitative predominance in the bay, more than the structure of bio-world itself. First of all this refers to some edible shellfish among which the oyster itself (Ostrea edulis, Linne). The results of investigations (1971. – 1976.) on variations in oyster larvae im Maloston Bay show that the whole area from the island of Otok ?ivota to the small village of Duba is suitable for placing stacks for the reception of larvae. However the Krstac position gave the best results as the number of received larvae throughout the period of investigation is concerned,as well as the largest number of larve found there (75513 larvae in a cubic metre of sea water). The survey of the stacks showed that the appropriate time for placing the stacks into the sea begins when there is 5% of oyster spawner in the black roe,when the number of learva in the sea reaches the quantity of 15000 per cubic metre of the water. Experimental boxes with oyster on levels varying from 1-8 metres were installed in The Bay of Bistrina to establish the in influence of depth on oyster growth.Growth and mortality rate were not only of theoretical, but also of practical value. Research performed between May 2000. and March 2002. points out to disturbance in cultivation of oyster in Mali Ston Bay what is evident in drastic diminution of juveniles in comparison with the previous period.