Hatching in two monogenean parasites from the common dogfish (scyliorhinus canicula): The polyopisthocotylean gill parasite, hexabothrium appendiculatum and the microbothriid skin parasite, leptocotyle minor

Whittington I.D. (1987) Hatching in two monogenean parasites from the common dogfish (scyliorhinus canicula): The polyopisthocotylean gill parasite, hexabothrium appendiculatum and the microbothriid skin parasite, leptocotyle minor. Journal of the Marine Biological Association of the United Kingdom, 67 4: 729-756. doi:10.1017/S0025315400057003


Author Whittington I.D.
Title Hatching in two monogenean parasites from the common dogfish (scyliorhinus canicula): The polyopisthocotylean gill parasite, hexabothrium appendiculatum and the microbothriid skin parasite, leptocotyle minor
Journal name Journal of the Marine Biological Association of the United Kingdom   Check publisher's open access policy
ISSN 1469-7769
Publication date 1987-01-01
Sub-type Article (original research)
DOI 10.1017/S0025315400057003
Open Access Status
Volume 67
Issue 4
Start page 729
End page 756
Total pages 28
Subject 1104 Complementary and Alternative Medicine
Abstract The eggs of two monogeneans, the gill-parasitic polyopisthocotylean, Hexabothrium appendiculatum and the skin-parasitic microbothriid, Leptocotyle minor, which share the same host, the common dogfish, Scyliorhinus canicula, have been hatched successfully for the first time. On application of dogfish secretions to fully developed eggs of both species many larvae become active within 5–10 s; the oncomiracidia of H. appendiculatum usually escape from the eggs within 25–50s after the application of a hatching stimulant and the larvae of L. minor hatch more rapidly within 10–15s after treatment. The larvae of both species hatch by extending their bodies and pushing off the operculum. Sea water solutions containing either 1 μmol analytical grade urea/ml or 1 μmol spectroscopically pure urea/ml are effective as hatching stimulants for the eggs of both parasites and experiments with urease indicate that urea is the likely stimulatory component of dogfish secretions. When incubated at 13–14 °C and exposed to LD 12:12 in the absence of host secretions, the eggs of these parasites fail to hatch spontaneously even after 88 days, although eggs of this age still contain living oncomiracidia. There is no evidence that mechanical disturbance or shadowing has a stimulatory effect on hatching. The apparent convergence between these two unrelated monogeneans in their hatching response extends to their egg shapes. The eggs of both parasites possess a long, slender abopercular appendage which renders the eggs particularly susceptible to minor water turbulence and this seems likely to have important implications regarding larval infection of the host.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 13 Sep 2016, 11:21:41 EST by System User