Component of bacteria on settlement substratum and their effects on larval settlement of scallop Argopecten irradians (Lamarck)
1997
Ji, Wei-Shang | Sheng, Ju | Xu, Bing | Xu, Huai-Shu(Ocean University of Qingdao, Qingdao (China). Dept. of Marine Biology)
Effects of marine bacteria, diatom (Phaeodactylum tericornutum) and chemicals (gamma-aminobutyric acid and melanin) on larval settlement of scallop Argopecten irradians L were studied. The experiments showed that there were a large number of bacteria on the substratum immersed in seawater for two days. In the early period, the bacteria produced fibrils and subsequently secreted large amount of attached bacteria on the surface of substratum. The scallop larvae tended to settle on the substratum on which bacteria had already attached. The number of larvae settled on a substratum covered with natural bacterial film was larger than that on a substratum covered with a mixture of natural bacteria and algae. Experiments with single-species films indicated that individual bacteria strain varied in their capacity in inducing settlement of larvae. Some bacteria strains could induce seventy-six percent more larvae to settle than none bacteria film control, while others failed to induce settlement of larvae, or even inhibited the process. These results indicated that attached bacteria played a major role in induction of larval settlement. Gamma-aminobutyric acid and melanin had detectable effect on the settlement of scallop larvae. Gamma-aminobutyric acid could also stimulate the growth of scallop larvae.
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