Serum biochemical parameters are important aspects in the management of endangered species such as Caspiomyzon wagneri. The objective of this survey was to determine some serum ionic and metabolic parameters and those relationships in 22 migratory population of Caspian lamprey in shirood river (a river located at the south of Caspian sea). There was no significant (P<0.05) difference between le...

Background: Mercury (Hg) is considered a global pollutant because Hg0 which is the predominant form of atmospheric Hg resides in the atmosphere for as long as 0.5 to 2 years. Mercury has many negative effects on the reproductive, respiratory, and immune systems. Methods: In this study, 24 Caspian lampreys (Caspiomyzon wagneri) were transported to the university laboratory and then stored in ...

environmental pollutions and deterioration of spawning grounds have threatened the caspian lamprey. these problems have led to the need for special protection of the species in many localities, nevertheless, there is surprisingly few information about the physiology of caspian lamprey. thus, the present study aimed to evaluate the correlations between blood serum biochemical parameters and gona...

background: mercury (hg) is considered a global pollutant because hg0 which is the predominant form of atmospheric hg resides in the atmosphere for as long as 0.5 to 2 years. mercury has many negative effects on the reproductive, respiratory, and immune systems. methods: in this study, 24 caspian lampreys (caspiomyzon wagneri) were transported to the university laboratory and then stored in -20...

The objective of this study was to determine the effect of human chorionic gonadotropin (hCG) on sexual maturation, plasma sex steroids (17β-estradiol, E2 and 17α-hydroxy progesterone (17α OHP)) and thyroid hormones (triiodothyronine, T3 and thyroxin, T4) levels in upstream - migrating Caspian lamprey. During the experiment, 36 fish (24 females and 12 males) in  spring 2013 and 36 fish (24 fema...

Lampreys worldwide face multiple anthropogenic stressors. Several species are ‘at-risk’ listed, yet abundance data for most remain insufficient to adequately assess conservation status. Lamprey population declines largely due habitat degradation and fragmentation, pollution, exploitation. Conservation priorities include: quantification of trends distribution; identification Evolutionarily Signi...

With habitats shrinking (e.g. due to construction projects that prevent access areas upper the Volgograd Reservoir), changes in environment, or illegal fishing some areas, there is registered a sharp decrease of population Volga lamprey. Studying histomorphological structure this species has significant impact on prediction and assessment state their internal organization. Problems such section...

Three anadromous lamprey species support important commercial fisheries in the northern hemisphere, sea Iberian Peninsula and France, European river Baltic Sea countries Russia, Arctic Russia. Pacific lamprey, Caspian Korean pouched are harvested for subsistence local commerce on coast of North America, China Oceania, respectively. Habitat loss caused by human activities rivers have reduced pop...

this study was investigated reproductive differences in fall and spring migrants of caspian lamprey (caspiomyzon wagneri) in the shirud river (southern caspian sea)in 2008. 89 and 15 specimens were sampled in in spring and fall, respectively. generally, fall migratory fish had a significantly lower condition factor (cf) compared to the spring migrants. there was significant relationship between...