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The Effect of Unilateral and Bilateral Eyestalk Ablation on Haemolymph Osmotic and Ionic Regulation and Gill Na+, K+-atpase Activity In Marsupenaeus Japonicus (bate, 1888) (Decapoda, Natantia)

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The effects of eyestalk ablation on osmotic and ionic regulation and Na+, K+-ATPase activity of Marsupenaeus japonicus were investigated in a period of 24 hrs. The osmolarity, potassium, and calcium concentration were high in the shrimps treated bilaterally, intermediate in the shrimps that were treated unilaterally, and low in the intact shrimps, while all those values of eyestalk ablated shrimps increased with increasing treatment time. However, the haemolymph sodium and chloride concentra- tion of eyestalk ablated shrimps were lowered, and also decreased further with increasing treatment time. The bilaterally and unilaterally ablated shrimps had higher total ATPase and Na+, K+-ATPase activities in the gills than the intact shrimp, and the ATPase activities of the ablated ones were raised with increasing treatment time up to 16 hrs. Therefore, eyestalk ablation of shrimps causes changes in the osmotic and ionic regulation, and also affects the Na+, K+-ATPase activity of the gills.

Les effets de l'ablation du pédoncule oculaire sur la régulation osmotique et ionique et sur l'activité de la Na+, K+-ATPase de Marsupenaeus japonicus ont été étudiés sur une période de 24 heures. L'osmolarité, la concentration en potassium et en calcium étaient élevées chez les crustacés traités bilatéralement, intermédiaire chez ceux traités unilatéralement et faible chez les non traités, et chez les crevettes ayant subi une ablation complète, toutes ces valeurs augmentaient avec la durée du traitement. Cependant, le sodium de l'hémolymphe et la concentration en chlorures chez les spécimens privés de pédoncule oculaire avaient diminué et ce encore plus lorsque la durée du traitement était prolongée. Les crustacés traités bilatéralement, et ceux traités unilatéralement avaient des activités d'ATPase totale et de Na+, K+ -ATPase plus élevées dans les branchies que les non traités, et les activités d'ATPase des spécimens traités augmentaient avec la durée de traitement, jusqu'à 16 heures. Ainsi, l'ablation des pédoncules oculaires chez ces crevettes provoque des modifications de la régulation osmotique et ionique, et affecte également l'activité de la Na+, K+-ATPase des branchies.


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