Experiences of integrated mariculture in a southern Tyrrhenian area (Mediterranean Sea)

To ascertain the potential for exploiting marine areas for mariculture, dat a on the cultivation of molluscs and fish in the open sea of the southern T yrrhenian were collected from May 1994 to June 1995. The aims of this integ rated study were to test simple breeding methods for molluscs and fish, to apply these to the practices employed by local fishermen and to experiment with the use of a cage system requiring a low level of investment. Crassost rea gigas (Thunberg) and Mytilus galloprovincialis (Lamarck) were cultivate d on submerged long lines around cages used for cultivating Seriola dumeril i (Risso) and Diplodus puntazzo (Cetti). S. dumerili specimens were placed in two cages and fed with either fish scraps or pellets, while in a third c age, D. puntazzo were fed with pellets only. After a period of 12 months, t he following results were obtained: the oysters measured 47.50 +/- 12.30 mm and weighed 0.13 +/- 0.09 g; the mussels placed in culture as juveniles re ached a length of approximate to 40 mm, while the mussels placed in culture as subadults reached the commercial size of about 60 mm. The mean length a nd weight measurements of the two fish species were as follows: Diplodus 22 8 +/- 14.4 mm and 228 +/- 40.48 g; Seriola (lot A) 438.1 +/- 25.28 mm and 1 149 +/- 172.2 g; Seriola (lot B) 347 +/- 25.6 mm and 576 +/- 139 g.