References in periodicals archive ?
The starry sturgeon, Acipenser stellatus, (Pallas 1771), limited to the Black, Azov and Caspian Seas, is one of the most important sturgeon species.
The starry sturgeon is a highly valuable species, a long-lived fish that grows and matures slowly with a low rate of natural mortality (Billard & Lecointre 2001).
Pectoral fin sections of the starry sturgeon are suitable for aging since they are easily collected, processed and have legible, precisely interpretable growth zone (Brennan & Cailliet 1989; Stevenson and Secor 2000).
A total of 69 specimens of the starry sturgeon, Acipenser stellatus, were obtained from Iranian coastal waters of the Caspian Sea between October 2008 and June 2010 (Fig.
The length and weight of the starry sturgeon estimated in this study were compared with the mean length and weight obtained from a previous study (Taghavi Motlagh 1996) in the south Caspian Sea, using the Student s one sample t-test (Zar 1996).
Shabany et al (2003) revealed that there is only one population of the starry sturgeon in Iranian coastal waters of the Caspian Sea and therefore data from different locations in the south Caspian Sea were pooled in this study.
Starry sturgeon females had a higher fork length and body weight (Table I) compared to males.
Descriptive length and weight composition of the male and female starry sturgeon from Iranian waters of the Caspian Sea in 2008-2010.
Males and females had dissimilar age-frequency distributions in Iranian coastal waters of the Caspian Sea ([x.sup.2]=36.63, df 14, P>0.001) The Iranian coastal waters of the Caspian Sea starry sturgeon had a higher proportion of females in the 18 and 19 year classes as compared to the males.
Growth trajectories were significantly different between the sexes for the starry sturgeon (F=3.79, df 3, 67 P > 0.05).
For the starry sturgeon in Iranian coastal waters of the Caspian Sea, the mortality rates (Z) for females and for males were calculated as 0.79 and 1.08 per year and the annual mortality (A) as 55% and 66% respectively.