Gonadal histology and some biochemical characteristics of Chalcalburnus tarichi (Pallas, 1811) having abnormal gonads

Abstract

The gonad histology, gonado-somatic index (GSI), 17b-estradiol (E 2 ) levels and acetylcholinesterase (AChE) activity in the carp species Chalcalburnus tarichi from Lake Van and the Karasu river, eastern Turkey, have been investigated. Fish between 5 and 7 years old were sampled from November 2003 to February 2004. The ratio of female fish caught in Lake Van with abnormal ovaries (AbOF) was 43.3%, but the fork length and body weight of these fish were not correlated with this abnormality. The weight of the ovaries and the GSI values of AbOF were very low (P < 0.05). Histological observations on the samples caught each month revealed that the oocytes had degenerated in the perinucleolus and early cortical alveolus stages and that the ovaries were full of somatic stromal tissue. In addition, the seminiferous tubules of male fish with abnormal testes did not contain male reproductive cells at any stage. The ovaries of the fish caught from the Karasu river were also full of oocytes in the perinucleolus and early cortical alveolus stages, but there were fewer atretic follicles. Furthermore, apoptosis was observed in the ovary cells of these fish, in particular in the follicular cells, and the plasma E 2 levels of the AbOF was very low (P < 0.05). AChE activity was inhibited only in liver (P < 0.05). We conclude that our sample of C. tarichi must have been exposed to various polluting chemicals or another unknown factors (such as global warming) and that these factors have irreversibly impaired oocyte development in a high percentage of fish.

Some aspects of reproductive biology on effect of heavy metal pollution on the histopathological structure of gonads in Labeo rohita (Hamilton-Buchanan) from Harike wetland, India

“…Johnson et al (1997) reported that atresia is thought to be an uncommon event in healthy females and it has been linked to poor nutrition and environmental stress. During the present course of work, it is observed that numbers of mature oocytes have been reduced with large follicular spaces, these observations coincides with those recorded by Unal et al (2007), Abou Shabana et al (2008), Mazrouch and Mahmoud (2009), Shobikhuliatul et al (2013) and Masarat et al (2014). From this study, it could be concluded that deformed and infected gonads of L. rohita collected from Harike wetland area were found in a higher percentage than those of River Beas.…”

Comparative responses in rare minnow exposed to 17β-estradiol during different life stages

“…These chemicals include breakdown products of detergents, pesticides, plasticizers, and a variety of chlorinated compounds (Sumpter and Jobling 1995;Carballo et al 2005). Considering the adverse physiological effects of EDCs on wildlife, many efforts have been made to develop and validate screening tests (Dizer et al 2002;Ü nal et al 2007). Now there is special concern about estrogenic chemicals among EDCs in the aquatic environment Nath et al 2007;Soto et al 1995).…”

Effect of heavy metals on the ovary of Tilapia zillii in some canals of Nile Delta area, Egypt.

“…The ovaries of female fishes that fail to spawn become atretic shortly after the spawning period (Guraya, 1994). Ovarian atresia of female fishes has been suggested to associate with several factors, including overcrowding and heavy metal concentration (Levavi-sivan et al, 2004); higher temperature (Saxena &Sandhu, 1994 andPankhurst et al, 1996); paucity of males (Tripple & Harvey, 1990); elevated pesticide (Sukumar & Karpaganapathy, 1992); dietary deficiencies (Kjesbu et al, 1991 andCerda et al, 1995); cyanide compounds (Alne-Na-Ei, 1997); confinement of fishes (Coward et al, 1998); sediment contamination (Alne-Na-Ei & Rady, 1998); spawning success (Levavi-sivan et al, 2004) and polluting chemicals or global warming (Unal et al, 2007).…”