Abnormal periostracum secretion during the mineralization process of the pearl in the blacklip pearl oyster Pinctada margaritifera / Comps, Michel

Public ISBD Faire une suggestion d'achat Titre : Abnormal periostracum secretion during the mineralization process of the pearl in the blacklip pearl oyster Pinctada margaritifera Type de document : texte imprimé Auteurs : Comps, Michel, Auteur Importance : pp. 49-55 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Whitish parasite-like bodies (PLBs), 0.5-2 [tm in size, were detected within the pearl bag of some grafted pearl oysters, Pinctada margaritifera, from Takapoto island (French Polynesia). Histological and ultrastructural investigations have revealed that these bodies consisted of lamellar organic material locally secreted by some epithelial cells of the pearl bag. The fine structure and the formation of these bodies are described. The causes of this abnormal secretion of organic mater, which actually corresponds to periostracum, are not presently known. No parasite nor infectious micro-organism was found associated with the PLBs. Abnormal periostracum secretion during the mineralization process of the pearl in the blacklip pearl oyster Pinctada margaritifera [texte imprimé] / Comps, Michel, Auteur . - [s.d.] . - pp. 49-55. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : Whitish parasite-like bodies (PLBs), 0.5-2 [tm in size, were detected within the pearl bag of some grafted pearl oysters, Pinctada margaritifera, from Takapoto island (French Polynesia). Histological and ultrastructural investigations have revealed that these bodies consisted of lamellar organic material locally secreted by some epithelial cells of the pearl bag. The fine structure and the formation of these bodies are described. The causes of this abnormal secretion of organic mater, which actually corresponds to periostracum, are not presently known. No parasite nor infectious micro-organism was found associated with the PLBs.

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Progress in pathological characterization of syndrome 85 in the black-lip pearl oyster pinctada margaritifera / Comps, Michel

Public ISBD Faire une suggestion d'achat Titre : Progress in pathological characterization of syndrome 85 in the black-lip pearl oyster pinctada margaritifera Type de document : texte imprimé Auteurs : Comps, Michel, Auteur Importance : pp. 195-202 Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : A programme of zoosanitary survey of the populations of black-lip pearl oyster (P. margaritifera) has been developed in French Polynesia during 1996 and 1997. Based on histological and ultrastructural examinations, the study of pearl oysters sampled in several pearl farms from the Society Islands, Tuarnotu Atolls and Gambier Archipelago, has been particularly turned to enzootic pathological problems. Particular attention has been given to the shell disease and to the necrosis of the adductor muscle, symptoms that had accompanied the mass mortality in 1985. Virus-like particles, about 40 nm in diameter, were detected in membrane bound vesicles from the nccrosizcd muscle tissue. A new Rickettsia-like organism found in epithelial cells of the digestive tubules was described, while parasites previously reported, such as cestodes and gregarines, were recognized in some animals. Apart from the pathology, a thorough study of 'parasite-like bodies' discovered in the pearl sack epithelium showed dysfunction in the periostracal secretion. Progress in pathological characterization of syndrome 85 in the black-lip pearl oyster pinctada margaritifera [texte imprimé] / Comps, Michel, Auteur . - [s.d.] . - pp. 195-202. Langues : Anglais (eng) Index. décimale : 578 Histoire naturelle des organismes vivants Résumé : A programme of zoosanitary survey of the populations of black-lip pearl oyster (P. margaritifera) has been developed in French Polynesia during 1996 and 1997. Based on histological and ultrastructural examinations, the study of pearl oysters sampled in several pearl farms from the Society Islands, Tuarnotu Atolls and Gambier Archipelago, has been particularly turned to enzootic pathological problems. Particular attention has been given to the shell disease and to the necrosis of the adductor muscle, symptoms that had accompanied the mass mortality in 1985. Virus-like particles, about 40 nm in diameter, were detected in membrane bound vesicles from the nccrosizcd muscle tissue. A new Rickettsia-like organism found in epithelial cells of the digestive tubules was described, while parasites previously reported, such as cestodes and gregarines, were recognized in some animals. Apart from the pathology, a thorough study of 'parasite-like bodies' discovered in the pearl sack epithelium showed dysfunction in the periostracal secretion.

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