De biologie van Lernaeocera branchialis
Schuurmans Stekhoven Jr., J.H. (1936). De biologie van Lernaeocera branchialis. Natuurwet. Tijdschr. 18(3-6): 157-161
In: Natuurwetenschappelijk Tijdschrift. L. Walschot/Natuur- en Geneeskundige Vennootschap: Gent. ISSN 0770-1748, more
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| Keywords |
Parasites
Copepoda [WoRMS]; Gadus morhua Linnaeus, 1758 [WoRMS]; Lernaeocera branchialis (Linnaeus, 1767) [WoRMS]; Pleuronectes flesus Linnaeus, 1758 [WoRMS]
Marine/Coastal |
| Author | | Top |
- Schuurmans Stekhoven Jr., J.H.
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| Abstract |
It could be stated, that the life cycle of Lernaeocera branchialis encloses a whole year, the maximum infection of Pleuronectes flesus being found in April-May, whereas the young, not yet one year old specimens of Gadus morrhua are infected in autumn. In September 1935 almost 14% of the young of Gadus morrhua was infected with young Lernaeocera. Parasitic degeneration of the parasite does not concern the mouthparts, nor the eyes, that remain unaltered in fullgrown females, although at that time they are not so easily seen, due to the thick chitinous covering of the skin. Carefully dissected specimens of Lernaeocera could be kept in aërated sea water during 6 consecutive days. The intestine serves the purpose of pumping the red blood of the parasite, which is considered to be a true respiratory pigment, to and fro through the body. Here peristalsis and antiperistalsis alternate and are automatically regulated. The pathological anatomy of the invaded tissues of the bulbus arteriosus of the heart of Gadus morrhua is described. Here a new equilibrium is turned out under compensatory reactions on the side of the connective tissue. |
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