The influence of formalin, benzocaine and hyposalinity on the fecundity and viability of Polylabroides multispinosus (Monogenea: Microcotylidae) parasitic on the gills of Acanthopagrus australis (Pisces: Sparidae)
Adult Polylabroides multispinosus exposed in vivo to formalin (200 p.p.m. in sea water, 30 min) deposited a similar number of eggs in 24 h in vitro as did control parasites (sea water, 35 parts per thousand, p.p.t., salinity) and worms exposed in vivo to benzocaine (40 p.p.m. in sea water, 10 min)....
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Veröffentlicht in: | International journal for parasitology 1993-11, Vol.23 (7), p.877-884 |
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Sprache: | eng |
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Zusammenfassung: | Adult
Polylabroides multispinosus exposed
in vivo to formalin (200 p.p.m. in sea water, 30 min) deposited a similar number of eggs in 24 h
in vitro as did control parasites (sea water, 35 parts per thousand, p.p.t., salinity) and worms exposed
in vivo to benzocaine (40 p.p.m. in sea water, 10 min). Worms laid more eggs at 30 p.p.t. salinity
in vitro than at 20, 35, 10 and 5 p.p.t. salinity (in decreasing order). Formalin (200 p.p.m., 30 min) decreased the viability of recently laid eggs, the survival of oncomiracidia, removed 70% of juvenile and adult worms from the gills, but decreased only slightly the viability of eggs exposed
in utero or after eyespots developed
in vitro. Salinities below 30 p.p.t. reduced viability as did an increase in temperature from 24 to 28°C. All adult and juvenile worms were removed by baths in formalin (400 p.p.m., 25 min) or fresh water (l h). |
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ISSN: | 0020-7519 1879-0135 |
DOI: | 10.1016/0020-7519(93)90053-2 |