<div style="text-align:justify">A study was conducted to investigate the growth parameters, mortality and recruitment pattern of Mastacembelus armatus collected in the Taojiang River fish landing site, Xinfeng County. M. armatus were collected from March, 2018 to February, 2019. Growth parameters, asymptotic length (L&infin;) = 58.8cm and growth coefficient (k) = 0.13 year-1. Growth performance index(&Oslash;2 ) =2.65, total mortality (Z) = 0.75 year-1, natural mortality (M) = 0.32 year-1, fishing mortality (F) = 0.43 year-1 and exploitation rate (E) = 0.57year-1.The estimated exploitation rate (E) has slightly exceeded the optimum value of E indicating this species was over exploited mainly due to fishing in the study area. The exploitation ratios were computed as Emax= 0.59, E10= 0.45, E50= 0.31. The length at first capture at 50%, (Lc) was 19.51 cm. The Steady biomass also increased with length class until 36.0-36.9 cm and the total steady state biomass was found to be 19.12 tons.</div>

<div style="text-align:justify">Estimation of Population Parameters and Stock Assessment of Mastacembelus armatus in the Taojiang River, Xinfeng County, Jiangxi Province, China</div>

Background: The soils of arid regions, especially steppe areas, are generally poor. Despite these challenging conditions, steppe plants manage to establish and adapt. The mycorrhizal symbiotic association has a crucial role in the nutrition and stress resistance of these plants. The present research aims to identify mycorrhizal fungi in three perennial plants native to the Algerian steppe: Aristida pungens, Retama raetam and Astragalus armatus.&nbsp; 
 
Methods: We took soil samples under and outside vegetation, along with corresponding roots for each plant tested and covering an air of 206 km. 
 
Result: The results varied among the three species: the rhizospheric soil under A. Pungenshad a moisture content of 5.28%, an organic matter content of 1.38%, a glomalin level of 2.83 mg/g of soil and the number of spores of 461.66 spores per 100 g of soil. In addition, soil under R. raetam gave more information on pH (8.13) and an EC of 0.12 ms/cm. and for A. armatus, its abundance was linked to a CaCO3 level of 9.79%. We recorded a positive correlation of glomalin with spore count and soil moisture. All three plants studied exhibited a high rate of mycorrhization exceeding 70%, with A. Armatushaving the highest averages

Estimation of Population Parameters and Stock Assessment of Mastacembelus armatus in the Taojiang River, Xinfeng County, Jiangxi Province, China

Evidence of Mycorrhizal Fungi Associated with Arid and Semi-arid Steppe Plants