Paper Information

Journal:   JOURNAL OF MARINE SCIENCES AND TECHNOLOGY   FALL 2012 , Volume 11 , Number 3; Page(s) 55 To 63.
 
Paper: 

ENDOCRINE DISRUPTIVE EFFECTS OF NAPHTHALENE IN IMMATURE AND MATURE FEMALES OF LIZA KLUNZINGERI

 
 
Author(s):  YARAHMADI ZAHRA, MOVAHEDINIA ABDOLALI*, RASTGAR SARA
 
* DEPARTMENT OF MARINE BIOLOGY, FACULTY OF MARINE SCIENCES, KHORRAMSHAHR UNIVERSITY OF MARINE SCIENCE AND TECHNOLOGY, KHORRAMSHAHR, IRAN
 
Abstract: 

This research intends to study on effects of naphthalene (NAP) on the plasma levels of cortisol, thyroxin (T 4), and triiodothyronine (T 3) on female immature and mature Liza klunzingeri at two exposure durations. In the first experiment, female fish were divided into control and treatment groups. A peritoneal injection of 50mg/kg of NAP in Zul/g vegetable oil was performed on the treatment group according to their body weight. The control group received only 2m/g vegetable oil based upon their body weight. Blood and gonad samples were taken from both groups after three hours. In the second experiment, implants of 50mglkg NAP in 10m/g coconut oil were used. Samples were collected 72hours after the implant. Fish gonadal phase were identified by histological study of the sampled ovaries, and plasma levels of cortisol, T3 and T4 hormones were measured. The results showed a significant increase and decrease of cortisol and T 4 levels, respectively, in both mature and immature groups in 3 and 72hours exposures. Following the 72hours-Iong stress, T3 levels significantly reduced. In both experiments, a significant change of T 3/T 4 ratio was observed only in the immature group. By activating aryl hydrocarbon receptors, causing disorder in the functions of hypothalamic- pituitary-interrenal and hypothalamic-pituitary-thyroid axes, disorder in synthesis and secretion of hormones, NAP changes their plasma levels; therefore, it decreases the physiological capacity and survival of fish when facing chemical stress.

 
Keyword(s): VITEIOGENESIS, 17β-ESTRADIOL, CORTISOL, TRIIODOTHYRONINE, POLYCYCLIC AROMATIC HYDROCARBON
 
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