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Title: A study on the pathological effects of trypanorhyncha cestodes in dusky groupers epinephelus marginatus from the canary islands
Authors: De Sales Ribeiro, Maria Carolina 
Rivero Santana, Miguel Antonio 
Fernández Rodríguez, Antonio Jesús 
García Álvarez, Natalia 
González Pérez, Jorge Francisco 
Quesada Canales, Ildefonso Óscar 
Caballero Cansino, María José 
UNESCO Clasification: 3105 Peces y fauna silvestre
310907 Patología
Keywords: Cestoda
Dusky Grouper
Epinephelus Marginatus
Fish Parasites
Fish Pathology, et al
Issue Date: 2021
Journal: Animals 
Abstract: Trypanorhyncha are cestodes commonly infecting marine fish. Numerous studies have detailed the biology of Trypanorhyncha species, but information on the pathological changes produced by these parasites is limited. Dusky groupers are keystone species necessary for the preser-vation of several marine ecosystems. Considering their vulnerable state of conservation and the ef-forts being made to culture them, identification of the effects caused by Trypanorhyncha is vital. Here, we aimed to determine the prevalence and pathological changes produced by Trypanorhyn-cha in dusky groupers from the Canary Islands. The prevalence of trypanorhynch plerocerci was 96%. Grossly, in the abdominal cavity, there were numerous larvae‐filled cysts and nodules. These were embedded in abundant fibrosis, producing visceral adhesions. Histologically, affecting the peritoneum, stomach, and intestine there were numerous degenerated encysted plerocerci and extensive deposition of mature connective tissue. These findings indicate that Trypanorhyncha is highly prevalent in adult dusky groupers from the Canary Islands, producing a progressive and chronic response. Furthermore, fish immune system appears to attempt to eliminate the parasites through fibrous encapsulation. Nonetheless, extensive fibrosis may have a detrimental impact on fish health when adjacent cells or tissues are compressed and their functions impaired.
ISSN: 2076-2615
DOI: 10.3390/ani11051471
Source: Animals [EISSN 2076-2615], v. 11 (5), 1471, (Mayo 2021)
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