Journal of Aquatic Ecology

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The aim of this study was to evaluate the effects of rainbow trout cages culture on the distribution, density and biomass of macrobenthic organisms and total organic matter, nitrate and phosphate in the Golestan reservoir. Sampling was carried out monthly at four stations including 1 (below cage), 2 (50 meters after the cage), 3 (150 meters after the cage) and 4 (control with a distance of 1km after the cage) using a grab with 0/0225 m² area. A total of 4 species of macrobenthic organisms were identified. The results showed that the density and biomass of macrobenthos were significantly higher in cage station compared to control station during the course of cage culture (p<0.05). After the course of cage culture, the density and biomass of macrobenthos showed no significant differences among cage culture station and control (p>0.05). The highest total organic matter, nitrate and phosphate in sediment were found in winter and in cage station that showed significant differences with control station (p<0.05). In conclusion,during cage culture the density and biomass of macrobenthos organisms, total organic matter, nitrate and phosphate in cage station were higher than those of other stations in which can be duo to fish cage activity and its effects on organisms.

Keywords: Biomass, Golestan reservoir, Trout, Macrobenthos

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