Water quality assessment of inlet water and effluent shrimp farms by applying the scale trophic index (TRIX) and unscaled trophic index (UNTRIX)

One of the most important issues in environmental management of coastal water is Evaluation of Eutrophication [4]. The aim of this study was to determine water quality input and output shrimp farms in TIAB Area. Water samples were collected at 4 stations during the 6 months at inlet water (at stations 1 and 2) and effluent from shrimp farms (at stations 1 and 2) in Tiab Area, Hormozgan province, during in 2018. In this study, after the review and development of trophic index, were evaluated the state of water quality and the level of trophic status by Scale (TRIXCS) and unscaled Trix index (UNTRIXCS). The TRIX index integrates chlorophyll-a (mg/m3), oxygen saturation (the percentage of oxygen deficiency is from saturated oxygen), dissolved inorganic nitrogen (μg/l) and reactive phosphate (μg/l). The TRIX index is scaled from 0 to 10, covering a range of four state water quality (High-quality, good, moderate, poor and degraded) and four level of eutrophication trophic statuses including: Low medium, high and elevated [1,2,3 and 4]. In this study were that TRIXCS value fall within a range from 4.9±0.1 to 6.7±0.2 and UNTRIXCS value fall from 3.4±0.1 to 5.2, respectively.The results showed that, based on the value trix index, the level of trophic status in the first and second stations (Inlet water) medium to high and the Fourth and fifth (effluent) was very high. Also, the State of water quality was good at station 1(the first inlet), moderate at station 2(the second input) and Poor and degraded at stations 4 and 5(effluent water). In this study, based on untrix index, in the first and second stations are without risk and high-risk at effluent water (3 and 4), respectively.