HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE

In adult salmon of the sea centres in southern Chile, a jaw deformation (JD) has been identified. It affects the dental and hyomandibular bones, which bend ventrally up to 90° of their normal position. The deformation affects also the dental articular bone. This pathology is related to weigh...

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Autores principales:	Venegas,Felipe, Montiel,Enrique, Forno,Pablo, Rojas,Mariana
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2003
Materias:	Jaw Jaw deformation Histology Salmon Salmo salar
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300005
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spelling	oai:scielo:S0717-950220030003000052003-11-28HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILEVenegas,FelipeMontiel,EnriqueForno,PabloRojas,Mariana Jaw Jaw deformation Histology Salmon Salmo salar In adult salmon of the sea centres in southern Chile, a jaw deformation (JD) has been identified. It affects the dental and hyomandibular bones, which bend ventrally up to 90° of their normal position. The deformation affects also the dental articular bone. This pathology is related to weight loss and increased mortality of the salmons. It was empirically postulated that a probable cause for this anomaly was food from vegetal origin in the diet of the fishes (which are carnivores) Therefore, the present work aims at comparing the biostructure of jaw bone of salmons fed either with vegetal (soja and gluten) formulation or animal formulation, mostly fish powder. Fifty specimens were analyzed from Puerto Montt, 35 having JD and 15 normal control. Samples were obtained in June, July and September 1999. (group 1) and March, Sept and October, 2000 (group 2). Group 1 was fed mostly with vegetal flour and group 2 with fish flour. Each group was subdivided in two subgroups, one of healthy animals and the other of fishes with JD. Jaw and articular bones were fixed in 10% formaldehyde and 1% glutaraldehyde and processed for histology (hematoxylin.eosin, Alcian blue, Masson trichrome) histochemistry (Syrius red and von Kossa) and scanning electron microscopy (SEM). The mandibular bone of group 1 with JD presented large amounts of osteoid tissue compared with its control. Collagen I disminishes and its architecture and composition changes, collagen III increases. No significant difference was found in calcium content between normal and JD fishes. SEM shows that the dental bone close to the joint in the fishes with JD displayed a disorganized structure and no trabecular formation, compared to controls, In group 2, these pathological findings were less evident, both macro- and microscopically. Results suggest that JD is of multifactorial origin; the primary cause can be a genetic or congenital alteration of the Jaw cartilage. There should be susceptibility for presentation of the defect in this group of fishes, but its expression is triggered by deficit of phosphorous of animal origin in food, so that this pathology is not seen in fishes with adequate nutrition.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.21 n.3 20032003-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300005en10.4067/S0717-95022003000300005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Jaw Jaw deformation Histology Salmon Salmo salar
spellingShingle	Jaw Jaw deformation Histology Salmon Salmo salar Venegas,Felipe Montiel,Enrique Forno,Pablo Rojas,Mariana HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
description	In adult salmon of the sea centres in southern Chile, a jaw deformation (JD) has been identified. It affects the dental and hyomandibular bones, which bend ventrally up to 90° of their normal position. The deformation affects also the dental articular bone. This pathology is related to weight loss and increased mortality of the salmons. It was empirically postulated that a probable cause for this anomaly was food from vegetal origin in the diet of the fishes (which are carnivores) Therefore, the present work aims at comparing the biostructure of jaw bone of salmons fed either with vegetal (soja and gluten) formulation or animal formulation, mostly fish powder. Fifty specimens were analyzed from Puerto Montt, 35 having JD and 15 normal control. Samples were obtained in June, July and September 1999. (group 1) and March, Sept and October, 2000 (group 2). Group 1 was fed mostly with vegetal flour and group 2 with fish flour. Each group was subdivided in two subgroups, one of healthy animals and the other of fishes with JD. Jaw and articular bones were fixed in 10% formaldehyde and 1% glutaraldehyde and processed for histology (hematoxylin.eosin, Alcian blue, Masson trichrome) histochemistry (Syrius red and von Kossa) and scanning electron microscopy (SEM). The mandibular bone of group 1 with JD presented large amounts of osteoid tissue compared with its control. Collagen I disminishes and its architecture and composition changes, collagen III increases. No significant difference was found in calcium content between normal and JD fishes. SEM shows that the dental bone close to the joint in the fishes with JD displayed a disorganized structure and no trabecular formation, compared to controls, In group 2, these pathological findings were less evident, both macro- and microscopically. Results suggest that JD is of multifactorial origin; the primary cause can be a genetic or congenital alteration of the Jaw cartilage. There should be susceptibility for presentation of the defect in this group of fishes, but its expression is triggered by deficit of phosphorous of animal origin in food, so that this pathology is not seen in fishes with adequate nutrition.
author	Venegas,Felipe Montiel,Enrique Forno,Pablo Rojas,Mariana
author_facet	Venegas,Felipe Montiel,Enrique Forno,Pablo Rojas,Mariana
author_sort	Venegas,Felipe
title	HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
title_short	HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
title_full	HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
title_fullStr	HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
title_full_unstemmed	HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE
title_sort	histology of the jaw deformation in salmon of southern chile
publisher	Sociedad Chilena de Anatomía
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000300005
work_keys_str_mv	AT venegasfelipe histologyofthejawdeformationinsalmonofsouthernchile AT montielenrique histologyofthejawdeformationinsalmonofsouthernchile AT fornopablo histologyofthejawdeformationinsalmonofsouthernchile AT rojasmariana histologyofthejawdeformationinsalmonofsouthernchile
_version_	1718444549917900800

HISTOLOGY OF THE JAW DEFORMATION IN SALMON OF SOUTHERN CHILE

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