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Marine algal toxins have drawn worldwide attention because of their involvement in human intoxication and the socio-economic impacts. Marine biotoxins have been produced by harmful bloom algae, known as dinoflagellate. In the present study, two groups of toxins, i.e. PSP, ASP analyzed in the muscle of shellfish caught from the north parts of the Persian Gulf (Bandar Abbas, Bandar Lengeh, Boushehr) and Oman Sea (Chabahar). Sample preparation and extraction were done according to AOAC methods and by ELISA. PSP amounts in the shellfish samples ranged from ND-3.962 and ND-1.477 ng/g muscle. The results showed all samples were safe

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  The present study ,Principal component analysis and multivariate index were used for Classification and determine of trophy by according to the European water framework directive in coastal water hormozgan  province. In the proposed approach, the  first principal component is used and evaluated as a eutrophication index on independent dataset and four variables nitrate, nitrite, ammonia and phosphate as abiotic factors for biomass and chlorophyll a was used as an indicator of phytoplankton production. Water samples were collected at 10 stations during the 12 months in 2012. During the investigation, Lower Trophy (0.1) were at stations 9 & 10 and the Highest value(1.5) observed at  the station 3(goorsoozan area). Based on the criteria by according to the European water framework directive ,level trophy in near coastal water and far from coast of Bandar Abbas have been In the situation of mezotroph condition, and the area Jask and Lengeh in oligotrophic condition respectively.Temporal analysis of Trophic conditions showed that the trophic status can be divided into first(oligo- mezotroph) and second(Mezo-Eutroph) periods. Also in many times, the level of water quality in coastal water of Bandar Abbas is the rank good or fairly good and the other area(Jask and Lengeh ) the good rating respectively.The low quality of coastal water in Bandar Abbas due to the potential impacts of the entry of nutrients from domestic and urban sewage into coastal waters.

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This study investigates the Artemia biomass and cysts changes in Urmia Lake in different time periods. However, changes in Artemia population in other hypersaline lakes such as the Great Salt Lake of America, Dead Sea and Griessmeir lake in Newzeland have also been investigated. The first documented estimation of Artemia stock in Lake Urmia was made by Gϋnther about 125 years ago. After him, in various time periods, Urmia Lake Artemia population was assessed by different authors. The most important researches of them were the studies which performed in last three decades. The highest Artemia population in Lake Urmia has been reported in 1990s which was simultaneous with the highest water standing level of the lake. Here after the lake water level was steadily declined, which negatively affected Artemia communities. In 2010s, Lake Urmia was faced with a water shortage crisis so, Artemia population declined dramatically. Regarding the Great Salt Lake similarities to Urmia Lake, this lake investigation were highlighted in our research. Generally, Artemia cysts density in Urmia lake were decreased from 2500 per liter in 1990s to 4.6 in 2010s, and the biomass from 1500 per cubic meter in 1990s to 4 per cubic meter in 2010s. Lowering the lake water level and simultaneously increasing its salinity is recognized as one of the most important factors in the Artemia population drop. Another crucial parameter in Artemia population decline in Lake Urmia is the significant reduction of algae population, particularly Dunaliella, which is the main food source of Artemia.

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In the current work, a comprehensive assessment of the spatial distribution of heavy metals including Cd, Pb, Ni, Cu, Zn, and Cr was performed in the sediments of mangrove and coral areas from 32 stations located in Tiab, Azini, Lark,  Hengam and Qeshm, Island, Bandar e pol and Bandar Khamir during the 2021 to 2022. The concentration of heavy metals showed significant spatial variations between the areas. The highest concentration of Cd 1.64±0.01 μg/g was observed at the station "Near Tabl village, South of the mangrove trees". The station "Tiab, end of the estuary" had the highest concentration of Pb 17.87±2.17 μg/g. The highest concentration of Ni 135.22±1.85 µg/g was seen in "North Tiab station, irrigation branch". The maximum concentration of metal Cr 18.41±0.41 μg/g was observed at the "Center of mangrove reservoir" station. There was the highest concentration of Zn 94.61±30.74 μg/g in "Azini Station 2" and finally, the highest concentration of Cu 40.5±0.28 μg/g was observed in the station "Khamir port, sandy bed of mangrove trees". The stations located in Tiab and the mangrove reserve had a higher intensity of pollution than other places and showed considerable risks of pollution, especially in terms of Ni and Cd. Cadmium was considered as the most dangerous metal in the studied areas which is probably caused by industrial activities. It is necessary to consider comprehensive and impressive strategies to control and reduce these heavy metal pollutions, especially in Tiab habitats and mangrove reserves where show high intensity of Cd and Ni contamination to identify, and manage the sources of these pollutions and minimize the impact of human activities on mangrove and coral ecosystems.