Ovarian alterations in wild northern pike Esox lucius females

Diseases of Aquatic Organisms

Andrzej Mamcarz¹  Jacek Rechulicz¹  Magdalena Gryzińska¹  Piotr Hliwa¹  Sławomir Krejszeff¹  Katarzyna Stańczak¹  Tomasz K. Czarkowski¹  Katarzyna Targońska¹  Katarzyna Palińska¹  Daniel Żarski¹  Krzysztof Kozłowski¹ 

关键词: Northern pike;    Ovary alterations;    Endocrine disruptors;    Reproduction;    Recruitment success;   

DOI  :  10.3354/dao02632

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: The aim of the present study was to analyse the occurrence of macroscopically visible ovary alterations in 2 populations of northern pike Esox lucius L. originating from lakes in the Mazurian Lake District (NE Poland). The alterations were characterised by ovary tissue that was morphologically malformed, in part or in whole, and contained immature oocytes, i.e. trophoplastic or previtellogenic oocytes instead of vitellogenic oocytes. These alterations were found only in the ovaries, and no morphological alterations of the testes were noted. Macroscopic and histological analyses were carried out in order to classify the observed alterations in the ovaries. Three types of alterations were identified in which morphological malformations as well as histological investigation of the ovaries were considered. An analysis of the size and age of the fish in relation to the occurrence of alterations as well as of the macroscopic and histological nature of the alteration types was made. The data obtained revealed no lake or age dependency of the observed alterations. Based on the results obtained, we suggest that the presence of endocrine disruptors in the environment or/and genetic factors could be responsible for these kinds of gonad anomalies. However, our results did not allow us to determine the aetiology of the alterations.

【 授权许可】

Unknown