The evaluation of some biological indices of stocked Huso huso fingerlings at Shahid Marjani and Voshmgir reservoir centers before releasing to Golestan Rivers

This trial was carried out in order to evaluation of some biological indices Huso huso fingerlings at Shahid Marjani (S.M) and Voshmgir Reservoir (V.R), and the fingerlings producers in these centers that release to rivers were investigated. The mean weight for releasing to S.M and V.R centers were 15.1±1.1 gr and 16.17±1.3 gr, respectively. The area for cultivating Huso huso fingerlings, the number of cultured fingerlings, the number of released fingerlings and survival rate in S.M center were 16 ha, 1300000, 743705 and 54.3%, respectively. Also, the area for cultivating Huso huso fingerlings in V.R center was 4 ha, the number of cultured fingerlings was 260000, the number of released fingerlings was 64810 and survival rate was calculated 53.6%. The length of fingerlings was in range of 10.5-23 cm and 8-33 gr in S.M center, and these factors were 14-20 cm and 10-25 gr in S.V center, respectively. Condition factor and growth rate in S.M. center were 0.45±0.02 and 5.4±0.8 respectively, and these parameters were 0.4±0.02 and 5.1±0.4 in V.R. center. The results of this study showed that condition factor and growth rate of fingerlings revealed no significant variation in S.M and V.R. centers (P>0.05). Regarding to proper growth of fingerlings, it can be concluded that rearing condition is average for this life stage in S.M and V.R.