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Saygun, Serkan/0000-0002-9789-3284 WOS: 000186034400004 One-year rope-grown mussels (Mytilus galloprovincialis Lam.) with a mean length of 37.6+/-0.52 mm and live weight of 5.02+/-0.28 g were collected from fish farm mooring ropes and cultured in cotton or nylon socks in a long-line system in Sinop, Black Sea. The growth of the mussels, water temperature, salinity, chlorophyll a, seston and particulate organic matter were monitored from July 1997 for eleven months. Shell length and live weight were high from May to October when the temperature was 13degreesC-25degreesC. Growth decreased during late autumn and winter due to the low temperature and food availability. A significant and positive relationship was found between particulate organic matter, shell growth and live weight. At the end of the experiment, shell length reached 59.89+/-0.93 mm in the cotton socks and 57.81+/-0.88 mm in the nylon socks, while live weight reached 19.42+/-0.91 g in the cotton socks and 16.89+/-0.76 g in the nylon. Harvestable production was lower in the cotton (4.1 kg/m) than in the nylon socks (8.7 kg/m). Meat yield was high during spring and early summer and significantly and positively correlated with chlorophyll a, particulate organic matter and seston. In the light of these results, recommendations for mussel culture in the long-line system are given.

In the present study, the larval development stages in the egg capsule of the Japanese snail (Rapana thomasiana, Gross 1861), distributed in the Black Sea were investigated. At the moment of capsule release, the diameter of the spherical egg was 151.5 ± 2.61 ?m. After the capsule was released, the eggs gradually lost their spherical structure. After the completion of the early larval development stage in the egg capsule, the larvae hatched from the capsule as a veliger on day 20. The larvae were pelagic during the following 5 days and settled to the bottom day 25. The length and width of the settled larvae reached 426.8 ± 2.84 ?m and 305.6 ± 2.2 ?m with a growth rate of 181.2% and 101.7%, respectively.

In this research, the possibilities of obtaining larva from oysters (Ostrea edulis L.) living in the Black Sea and their metamorphosis stage were investigated. There were no difficulties in obtaining larvae. The results of this investigation indicate that flat oyster (Ostrea edulis L.) culture is possible in Black Sea conditions.