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  • 1
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    Infection of skipjack tuna Katsuwonus pelamis (Linnaeus 1758) of Oman Sea with cestode Trypanorhyncha (Diesing 1863) (2018)
    Details
    Publication Date: 2021-05-19
    Description: Numerous reports on existence of white cysts in musculature of skipjack tuna Katsuwonus pelamis and lack of information about the quality of cysts and individual responses of fish to them led the authors to focus on this fish as a commercially valuable species. This study investigated the histopathologic responses of skipjack tuna to highly prevalent cystic larval stages of Trypanorhyncha. Some 92.25% of 400 examined skipjack tuna of Oman Sea (Iran) captured from processing center in Chabahar have been diagnosed infected by Trypanorhyncha Larvae through gross muscle examination. Minimum of 5 to maximum of 19 cysts were observed per each flank flesh with no significant difference between number of cysts from right (9 ± 4) and left flanks (10 ± 4) and also males and females (p〉.05, t- student test (spss version 16)). Using hematoxylin and eosin (H&E) staining of 4µm sections of surrounded cysts with muscle and light microscopy observations each metacestode was distinguished encapsulated by surrounding fibrous cyst wall consists of thin inner layer and a thick outer layer with the minimal histopathologic changes around it. The highly prevalent Trypanorhyncha infection in Oman Sea represents the high rate of infection among elasmobranches. The ability of encapsulated parasite to escape from the immune system of the host is assumed as one reason for the observed minimal tissue response in infected fish and the continuation of infection among elasmobranches and teleosts of Omen Sea.
    Description: Published
    Keywords: Ecology ; Katsuwonus pelamis ; Skipjack tuna ; Trypanorhyncha ; Histopathology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.469-476
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    PAPER (OA)
  • 2
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    Unknown
    Occurrence and histopathology of Ascocotyle tenuicollis metacercaria in gill of platyfish (Xiphophorus maculatus) imported to Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: The objective of this study was to determine the prevalence of metacercarial infection in plathyfish imported to Iran. A total of 100 imported live common platyfish (Xiphophorus maculatus) from approximately 24 shipments were collected from a quarantine facility in Iran in 2007 and examined in our veterinary laboratory. Among 800 examined gill arches about 1300 cysts were found in different locations of gill filaments and were identified as a heterophyid parasite metacercaria Ascocotyle (Ascocotyle) tenuicollis Price, 1935. The prevalence of this parasite was 58%, the maximum and minimum quantity of metacercarial cysts per infected platyfish were 70 and 10, respectively. The adult worms are non-pathogenic and are intestinal parasites of piscivorous birds (e.g. Heron and Egret) and mammals. The first intermediate hosts are snails and the second intermediate hosts are centrarchiid, cyprinodontid, mugilid, and poeciliid fishes. Histopathologic examination of the infected fish gills revealed cartilage proliferation around metacercarial cysts, hyperplasia, hypertrophy and fusion in the affected gill filaments. To our knowledge, this is the first report of infection with Ascocotyle tenuicollis in the imported platyfish in Iran.
    Description: Published
    Keywords: Xiphophorus maculatus ; Metacecaria ; Platyfish ; Gill ; Pathology ; Ascocotyle
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.472-477
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  • 3
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    Unknown
    Infection of skipjack tuna Katsuwonus pelamis (Linnaeus 1758) of Oman Sea with cestode Trypanorhyncha (Diesing 1863) (2021)
    In:  http://aquaticcommons.org/id/eprint/22701 | 18721 | 2018-05-16 20:29:16 | 22701 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: Numerous reports on existence of white cysts in musculature of skipjack tuna Katsuwonus pelamis and lack of information about the quality of cysts and individual responses of fish to them led the authors to focus on this fish as a commercially valuable species. This study investigated the histopathologic responses of skipjack tuna to highly prevalent cystic larval stages of Trypanorhyncha. Some 92.25% of 400 examined skipjack tuna of Oman Sea (Iran) captured from processing center in Chabahar have been diagnosed infected by Trypanorhyncha Larvae through gross muscle examination. Minimum of 5 to maximum of 19 cysts were observed per each flank flesh with no significant difference between number of cysts from right (9 ± 4) and left flanks (10 ± 4) and also males and females (p〉.05, t- student test (spss version 16)). Using hematoxylin and eosin (H&E) staining of 4µm sections of surrounded cysts with muscle and light microscopy observations each metacestode was distinguished encapsulated by surrounding fibrous cyst wall consists of thin inner layer and a thick outer layer with the minimal histopathologic changes around it. The highly prevalent Trypanorhyncha infection in Oman Sea represents the high rate of infection among elasmobranches. The ability of encapsulated parasite to escape from the immune system of the host is assumed as one reason for the observed minimal tissue response in infected fish and the continuation of infection among elasmobranches and teleosts of Omen Sea.
    Keywords: Biology ; Fisheries ; Skipjack tuna ; Oman Sea ; Trypanorhyncha ; Histopathology ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 469-476
    Location Call Number Expected Availability
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  • 4
    facet.materialart.
    Unknown
    Occurrence and histopathology of Ascocotyle tenuicollis metacercaria in gill of platyfish (Xiphophorus maculatus) imported to Iran (2021)
    In:  http://aquaticcommons.org/id/eprint/22392 | 18721 | 2018-04-03 13:17:14 | 22392 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-04
    Description: The objective of this study was to determine the prevalence of metacercarial infection in plathyfish imported to Iran. A total of 100 imported live common platyfish (Xiphophorus maculatus) from approximately 24 shipments were collected from a quarantine facility in Iran in 2007 and examined in our veterinary laboratory. Among 800 examined gill arches about 1300 cysts were found in different locations of gill filaments and were identified as a heterophyid parasite metacercaria Ascocotyle (Ascocotyle) tenuicollis Price, 1935. The prevalence of this parasite was 58%, the maximum and minimum quantity of metacercarial cysts per infected platyfish were 70 and 10, respectively. The adult worms are non-pathogenic and are intestinal parasites of piscivorous birds (e.g. Heron and Egret) and mammals. The first intermediate hosts are snails and the second intermediate hosts are centrarchiid, cyprinodontid, mugilid, and poeciliid fishes. Histopathologic examination of the infected fish gills revealed cartilage proliferation around metacercarial cysts, hyperplasia, hypertrophy and fusion in the affected gill filaments. To our knowledge, this is the first report of infection with Ascocotyle tenuicollis in the imported platyfish in Iran.
    Keywords: Biology ; Fisheries ; Metacecaria ; Platyfish ; Gill ; Pathology ; Ascocotyle ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 472-477
    Location Call Number Expected Availability
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    PAPER (OA)
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