胶州湾不同水层中养殖海湾扇贝生长与死亡的比较

本试验于1985年在胶州湾进行。结果表明:表面下2米水层养殖海湾扇贝最好,个体生长较大,死亡较少,1米水层养者次之,3米者再次之,海底者最差。养殖笼上的附着物随水深加大而数量减小,1米水层者为2米者的2倍,3米者的8倍,底层者的20倍。1米水层大量滋生的附着物对该水层养殖的海湾扇贝造成较大的不良影响。

GROWTH AND MORTALITY OF BAY SCALLOP ARGOPECTEN IRRADIANS CULTURED AT VARIOUS WATERLAYERS IN JIAOZHOU BAY

Two groups of experiments were carried out in 1985 to study the eff-ect of depth on growth and mortality in culture of bay scallop. The results showedthat those cultured at 2 meters below the surface gave the best growth and lowestmortality. Those cultured at 1 meter and 3 meter depth grew poorer than that at 2meter while the bottom group was the poorest. The fouling on net-cages decreasedwith increase of depth. That at 2 meters the amount of fouling was about half ofthat at 1 meter, that at 3 meters was about 1/8 of that at 1 meter, and that on thebottom was merely 1/20 of that at 1 meter. Oysters (Crassostrea plicatula) attachedto shells of scallops in polyethylene net-cages at 1 meter depth were bigger in size andmore in number (about twice) than those at 2 or 3 meters depth. In hard plasticnet-cages, the oysters attached have about equal in size and number at any metersdepth. The dense fouling on the cage at 1 meter depth might effect growth of cultu-red bay scallop.