Abstract
structure and some abiotic parameters of Rabigh Lagoon, Saudi Arabia, during the 2019 seasons. The study aimed to assess Rabigh Lagoon's environmental health while also reviewing the ecological database for the area under investigation. Seven sites were studied, with latitudes ranging from 22.9978 degrees to 22.8519 degrees N and longitudes ranging from 38.8339 degrees to 38.9616 degrees E. Temperature, Transparency, pH, DO, Salinity%, Nutrients, Nitrogen, and phosphorus are abiotic factors as the ecological parameters. The micro-algal flora was identified and divided into five micro-algal flora groups. Chlorophyll-a levels in the spring range from 14.25 mu g.l(-1) to 6.32 mu g.l(-1) in the summer. Micro-benthic fauna groups were identified as Copepoda, Protista, and Rotifera. According to transparency methods for calculating the Trophic status index besides the chlorophyll-a and total phosphorus, methods were used to assess the eutrophication of the Rabigh Lagoon. Rabigh Lagoon is a mesotrophic ecosystem, according to the study.