Dehydration is more effective for the control of embryonic development and larval hatching of Diplectanum aequans (Monogenea, Diplectanidae) than formalin and trichlorphon |
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| Authors: | S Cecchini AM Cognetti-Varriale |
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| Institution: | (1) Department of Sciences of Animal Production, University of Basilicata, Via N. Sauro, Potenza, 85100, Italy;(2) Department of Animal Pathology and Prophylaxis and Hygiene of Food, University of Pisa, Viale delle Piagge 2, Pisa, 56124, Italy |
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| Abstract: | Embryonic development and larval hatching of the monogenean Diplectanum aequans, gill parasite of sea bass Dicentrarchus labrax, was studied in relation to different prophylactic treatments. Groups of eggs of D. aequans were submitted to different in vitro treatments: formalin (300 and 100  L L–1 per 1 hour), Neguvon® (trichlorphon 0.2 mg L–1 per 48 hours) and dehydration for 4 and 8 hours. Percentages of hatched larvae, aborted larvae and undeveloped embryos were estimated in comparison with the control group. Results showed that 300 L L–1 formalin and dehydration treatments were able to reduce larval hatching significantly, while Neguvon® and 100 L L–1 formalin treatments had no effect. |
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| Keywords: | Diplectanum aequans Embryonic development Larval hatching Prophylactic treatments Sea bass |
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