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Ontogenic changes in the contents of dopamine, norepinephrine and serotonin in larvae and postlarvae of the bivalve Pecten maximus

Published online by Cambridge University Press:  15 November 2002

Christine Cann-Moisan
Affiliation:
Service de Physiologie, Faculté de Médecine, Université de Bretagne Occidentale, 22, avenue Camille Desmoulins, 29285 , Brest cedex, France
Laurence Nicolas
Affiliation:
Laboratoire de Physiologie des Invertébrés Marins, Ifremer, Écloserie Expérimentale d’Argenton, Presqu’île du Vivier, 29840, Landunvez, France
René Robert
Affiliation:
Laboratoire de Physiologie des Invertébrés Marins, Ifremer, Écloserie Expérimentale d’Argenton, Presqu’île du Vivier, 29840, Landunvez, France
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Abstract

In the present study, norepinephrine (NE), epinephrine (E), dopamine (DA) and 5-hydroxy-tryptamine (5HT) have been quantified by high performance liquid chromatography (HPLC) in Pecten maximus during larval and post-larval development. With average values ranging from 2 to 5 pg μg–1 of protein, NE remained low through the whole larval life, while epinephrine (E) was undetected. DA and 5HT were the most abundant monoamines with significant variations between larval, pre-metamorphic and post-larval stages. During the first 20 days, corresponding to D larval and umboned larval stages, levels of DA and 5HT increased from 15 to 30 and 10 to 15 pg μg–1 of protein, respectively. Then during the last week of larval life, at the approach of metamorphosis, DA rose sharply from 30 to 50 pg μg–1 of protein and 5HT from 15 to 50 pg μg–1 of protein. Lastly during the first week of post-larval life (day 27 to day 34) DA and 5HT contents declined to levels similar to those detected in the first days of larval life reaching progressively 1 pg μg–1 of protein during the second week of post-larval life (day 34 to day 55). These rapid and transient variations in monoamine contents (5HT and DA) around metamorphosis, present a great interest. However, this relation between neurochemical changes and metamorphosis must be confirmed with future studies in order to verify if such monoamines might be used as indicators of larval competence in P. maximus, a commercially important species.

Type
Research Article
Copyright
© Elsevier, IRD, Inra, Ifremer, Cemagref, CNRS, 2002

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