Survey on Comparison of the Distribution and Catch Condition of Acipenser Guldenstaedtii Brant & Ratzeburg 1832, in Fishing and Beach Seine on the Southern of Caspian Sea ( Mazandaran waters)

This study have been conducted in the southern Caspian Sea (Mazandaran waters) from 2009-2012. The purpose of this study was compared to distribution, abundance, catch condition, catch per unite effort (CPUE) and caviar ratio in fishing cooperative societies (Pare) and landing. Sampling was monthly and specimens were collected by two methods including commercial beach seine (by Pare) and monofilament gill net (legal catch by landing). The results showed that a total of 42 individuals of A.guldenstaedtii caught 29 of them have had caviar. Sex ratio of male to female was 1:3.2 (male:female). Overall, mean fork length (±standard deviation), body weight, weight of meat and fish weight comprise to 132.1±11.3cm, 20.0±5.1kg, 14.9±3.7kg and 3.6±1.1 kg respectively were found. There is a significant difference between the amount of caviar in landing and beach seine (p<0.05). The meat and fish caviar in Babolsar was mor Noshahr landings than the areas in which can be concerned number of landing, geographic conditions and fishing efforts. The highest and lowest caviar and meat was obtained in Larim and Nursar landings, respectively. The catch per unit effort (CPUE) of Russian sturgeon by the landing from 2009 to 2012 has decreased to 97%., to preserve its generation project in the Caspian Sea should be banned trade catch but catches of spawners that will be applied to artificial propagations. In addition, because of anadromous species protect and restore these important river fisheries should be considered by the relevant authorities.