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Poster Abstract

25. ALLOMETRY VARIATION IN STURGEON FISHES IN SOUTHEASTERN CASPIAN SEA, ITS BIOLOGICAL IMPLICATIONS

Rahman Patimar¹ and Asghar Abdoli^2
1 Department of Natural Resources, Gonbad Kavous University, Gonbad, Iran
² Department of Biodiversity and Ecosystem Management, Environmental, Sciences Research Institute, Shahid Beheshty University, Teharn, Iran

Variation of the allometry coefficient of WLRs can aid in the identification of factors contributing to growth model of the fishes. To investigate this coefficient in Sturgeon fishes, a total of 9055 specimens including four species of Persian sturgeon Acipenser persicus, Russian sturgeon Acipenser guldenstaedti, Stellate sturgeon Acipenser stellatus, Ship sturgeon Acipenser nudiventris and Great sturgeon Huso huso were sampled in commercial sturgeon fishery (southeast Caspian Sea-Iran) between 2001 and 2006. Values of b ranged between 2.055 for males of great sturgeon to 3.551 for sexes combined group of ship sturgeon, showing considerable variation between species and among years. These findings are useful for conversion of growth-in-length equations to growth-in-weight for use in stock assessment models, to estimate stock biomass from limited sample sizes, especially based on sub-aquatic census (visual fish counting), for the calculation of production and biomass of a fish population, to estimate of population size of a fish stock for the purpose of its rational exploitation and comparison of life history and morphological features between different fish species, or between fish populations from different habitats and/or regions.

Keywords: allometry coefficient, sturgeon, Caspian Sea