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International Journal of Fauna and Biological Studies

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e-ISSN : 2347-2677, p-ISSN : 2394-0522

International Journal of Fauna and Biological Studies

International Journal of Fauna and Biological Studies

2015, Vol. 2 Issue 1, Part A

Settlement of the tropical abalone Haliotis asinina on different diatoms

Author(s):

Emmanuel C. Capinpin Jr

Abstract:
The settlement of abalone Haliotis asinina larvae on 5 species of locally isolated diatom strains (Navicula mollis, Stauroneis sp., N. ramosissima, Pleurosigma sp., and Cocconeis sp.) were examined in the laboratory. Attachment and metamorphosis of H. asinina were 2 distinctly different responses. Attachment was observed as the larval foot becomes firmly attached to the surface of the substratum. In the experiment, high attachment on all treatments, including control, was observed at 6 h after start of the experiment (about 45 h after fertilization) at 26.5-27.5 °C. Larvae were observed to detach and swim off the substratum for over 3 d after beginning of the experiment. The metamorphosis was non-reversible and could occur in larvae at 4.6 d after fertilization. All the diatom films stimulated attachment behavior but only a few induced low levels of normal metamorphosis over several days. Completion of metamorphosis as evidenced by shell growth was observed at low levels (4-16%) 5 days after experiment began (6 d after fertilization) only on Cocconeis sp., N. mollis, and Pleurosigma sp.
 a, Larva at the start of the experiment
Fig. 1: a, Larva at the start of the experiment
b, Larva began to attach and crawl on the bottom and sides, including control dishes 6 h after start of experiment
Fig. 2: b, Larva began to attach and crawl on the bottom and sides, including control dishes 6 h after start of experiment

Pages: 30-34  |  1139 Views  102 Downloads

How to cite this article:
Emmanuel C. Capinpin Jr. Settlement of the tropical abalone Haliotis asinina on different diatoms. Int. J. Fauna Biol. Stud. 2015;2(1):30-34.
International Journal of Fauna and Biological Studies