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Experimental infection of eggs and yolk sac larvae of halibut, Hippoglossus hippoglossus L.
Author(s) -
BERGH Ø.,
HANSEN G. H.,
TAXT R. E.
Publication year - 1992
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.1992.tb01237.x
Subject(s) - hippoglossus hippoglossus , biology , hatching , yolk sac , halibut , larva , yolk , vibrio , radiata , andrology , bacteria , anatomy , fishery , zoology , embryo , botany , fish <actinopterygii> , medicine , genetics , vigna
Scanning electron micrographs of halibut eggs with an epiflora dominated by Flexibacter sp., showed ulcerations colonized by large numbers of bacteria. The chorion was dissolved in most ulcerations and the zona radiata was severely damaged. Infection experiments showed that exposure to these bacteria caused high mortalities at the late egg stage, hatching and the early yolk sac stage. Eggs exposed to three different Vibrio spp. showed different mortality patterns, with low mortality at hatching, followed by a continuous high mortality throughout the yolk sac stage. Mortality in the uninfected control group was low throughout the experiment. Transmission electron microscopy of the Vibrio ‐infected larvae showed bacteria present in the gill, heart and frontal yolk sac regions.