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A novel testicular degenerative condition in a wild population of the common carp Cyprinus carpio (L)


Mahmud, R and Purser, J and Patil, JG, A novel testicular degenerative condition in a wild population of the common carp Cyprinus carpio (L), Journal of Fish Diseases, 43, (9) pp. 1065-1076. ISSN 0140-7775 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 John Wiley & Sons Ltd

DOI: doi:10.1111/jfd.13216


Gonad abnormalities can restrict or completely block reproductive capability of individuals and in some case that of their populations. Here, we describe a novel testicular degenerative condition of non‐germ cell origin with a high prevalence (up to 22.1% of the population) in a wild population of carp. Based on gross morphology, and microscopic and cellular examinations, the condition shows progressive severity which could be categorized into low, mild, severe and complete. In early stages of the condition, an abnormally increased proliferation (11‐fold) of the Sertoli cell occurred, followed by degenerative cell death of all testicular cells, resulting in fluid‐filled vesicles in the later stages. This initial uncontrolled proliferation of Sertoli cells suggests that the condition could be triggered by malignant pathways; however, the observed subsequent apoptosis of all testicular cells en masse , rendering the animals "sterile," appears unique. Observations, to date, indicate that this condition is specific to male carp and not present in other species of fish sharing the habitat. High prevalence of the condition allowed comparative evaluation between affected individuals, an aspect likely to facilitate future studies, including elucidation of the cause, robust testing of therapies and practical applications such as management of feral carp populations.

Item Details

Item Type:Refereed Article
Keywords:carp, pest fish, JGC, apoptosis, carp control, histology, jelly-like gonad condition, testicular degeneration
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fish pests and diseases
Objective Division:Environmental Management
Objective Group:Fresh, ground and surface water systems and management
Objective Field:Control of pests, diseases and exotic species in fresh, ground and surface water
UTAS Author:Mahmud, R (Mr Raihan Mahmud)
UTAS Author:Purser, J (Associate Professor John Purser)
UTAS Author:Patil, JG (Dr Jawahar Patil)
ID Code:140070
Year Published:2020
Deposited By:Fisheries and Aquaculture
Deposited On:2020-07-23
Last Modified:2021-02-03

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