Alterations in histology and antioxidant defense system in the testes of the lake Van fish (Alburnus tarichi Guldenstadt, 1814)

Kaptaner B., Kankaya E., Doğan A., Durmuş A.

ENVIRONMENTAL MONITORING AND ASSESSMENT, vol.188, no.8, 2016 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 188 Issue: 8
  • Publication Date: 2016
  • Doi Number: 10.1007/s10661-016-5476-z
  • Journal Name: ENVIRONMENTAL MONITORING AND ASSESSMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: Alburnus tarichi, Testes, Histological alterations, Oxidative stress, Lake Van basin, TILAPIA OREOCHROMIS-NILOTICUS, OXIDATIVE STRESS BIOMARKERS, HISTOPATHOLOGICAL CHANGES, HEALTH-STATUS, WILD FISH, LIVER HISTOPATHOLOGY, ENDOCRINE DISRUPTION, AQUATIC ORGANISMS, DNA INTEGRITY, RIVER
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

Recent reports have demonstrated gonadal abnormalities in the Lake Van fish (Alburnus tarichi) from Lake Van caused by increasing pollution. In the present study, the fish was collected from an area of Lake Van receiving mainly sewage treatment plant effluent at prespawning period (April) and from a river (Karasu) which is close to the polluted area of the lake and where the fish migrates at spawning period (May). Collected specimens were examined for testicular alterations, gonadosomatic index (GSI), condition factor (CF), and antioxidant defense system biomarkers based on comparison with a reference lake (Ercek) and a reference freshwater inlet (Memedik River). Histological examinations of the testes of fish from the polluted area and the connected river showed various alterations consisting of macrophage aggregates, vacuolation, pyknosis, germ cell degeneration, seminiferous tubule dilation, disorganization of tubules, reduced spermatozoa, and fibrosis. A lower GSI and CF were also observed. Moreover, alterations in the antioxidant system biomarkers were determined in the testis tissues of fish from the Lake Van and Karasu River, indicating oxidative stress. These results suggest that the abnormalities in the testes are causally related to the increased oxidative stress, and pollution in Lake Van may have adversely affected the reproductive health of the lake Van fish.