扇贝幼虫附着基的细菌组成及其作用

自海湾扇贝幼虫附着基表面分离到99株附着细菌。经鉴定、分类至9属包括弧菌属、假单胞菌属、无色杆菌属,芽孢杆菌属、气单胞菌属、葡萄球菌属、微球菌属、棒杆菌属和黄杆菌属。扇贝幼虫的附着基表面具有一定数量的附着细菌。单一菌株菌膜实验表明,不同菌株形成的菌膜对幼虫附着的吸引力大小不一。有的细菌促进幼虫附着,有的却有抑制作用。

COMPONENT OF BACTERIA AND THEIR EFFECTS ON SETTLEMENT SUBSTRATUM OF LARVAE OF SCALLOP

Ninety-nine strains of attached bacteria were isolated from settlem-ent substratum of larvae of Argopecten irradians L. in hatchery tanks. The bacteriawere identified and classified into nine genera, including Vibrio, Pseudomonas,Achromobacter, Bacillus, Aeromonas, Staphalococcus, Micrococcus, Corynebacteriumand Flavobacterium. After the settlement of larvae, the bacteria isolated from subs- tratum were all Gram's negative rods. The settlement of larvae need certain amountof attached bacteria on the surface of substratum. Experiments with single-species'films indicated that individual bacteria strain varied in their capacity in inducingsettlement of larvae. Some bacteria strains could induce seventy-six percent morelarvae to settle than none film's control, while others failed to induce settlementof Larvae, or even inhibited the process