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Antifouling performance of the embryo and eggcase of the dogfish Scyliorhinus canicula

Published online by Cambridge University Press:  09 October 2019

Jeremy C. Thomason ,
John Davenport  and
Andrew Rogerson
Jeremy C. Thomason
Affiliation:
University Marine Biological Station, Millport, Isle of Cumbrae, Scotland, KA28 OEG
John Davenport
Affiliation:
University Marine Biological Station, Millport, Isle of Cumbrae, Scotland, KA28 OEG
Andrew Rogerson
Affiliation:
University Marine Biological Station, Millport, Isle of Cumbrae, Scotland, KA28 OEG
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Abstract

The antifouling performance of the dogfish Scyliorhinus canicula (L.) (Elasmobranchii: Squaliformes) eggcase-embryo combination was studied under experimental conditions, in conjunction with an analysis of fouling on wild cases. The cases were shown to develop an external heterogeneous microbial biofilm, and an internal heterogeneous microbial biofilm (when the case opens) composed primarily of cocci and bacilli. Macrofouling was limited on egg-cases (unless kept under high light intensities). Macrofouling ranged from <5% (recently laid cases) to 42% (>300 days exposure). This is a better performance than many commercial antifouling treatments. There was no evidence that the embryo was involved in the antifouling process. A priori, three hypotheses are suggested that might explain the antifouling mechanism of the dogfish eggcase-embryo combination: (1) the yolk/albumin/embryo emit antifouling chemicals; (2) a bacterial culture develops that prevents further fouling; (3) the case with/without an embryo has antifouling properties. The results presented here support the third hypothesis.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 74 , Issue 4 , November 1994 , pp. 823 - 836
Copyright
Copyright © Marine Biological Association of the United Kingdom 1994

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