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۱Liver Histopathological Changes in Milkfish (Chanoschanos)Exposed to Petroleum Hydrocarbon Exposure
اطلاعات انتشار: World Applied Sciences Journal، بيست و هشتم،شماره۱۱، ۲۰۱۳، سال
تعداد صفحات: ۶
Oil pollution is a significant hazard for the marine environment. There is an increasing risk of a major pollution spill in the Persian Gulf waters because of heavy transport of crude oil, petrol and its derivations. The aim of this study was to investigate the effect of exposure petroleum hydrocarbons on the milkfish liver at different concentration and different time points. After determination of lethal concentration of total petroleum hydrocarbons (Lc50–96h), collected specimens of Chanoschanos were exposed to different concentrations of petroleum hydrocarbons. The main histological alternation observed in this study include: sinusoid dilation, vacuolation, lipidiosis, necrosis, hepatocytic nuclear pleomorphism and bile stagnation. Our result showed that, the intensity of these histological changes was influenced by the extent of the exposure period and concentration of pollution.

۲Seasonal variation of zooplankton abundance, composition and biomass in the Chabahar Bay, Oman Sea
اطلاعات انتشار: International Journal of Aquatic Biology، اول،شماره۶، Dec ۲۰۱۳، سال
تعداد صفحات: ۱۲
Temporal and spatial variation of zooplankton abundance, composition and biomass were examined on the Chabahar Bay, Oman Sea. The Chabahar Bay, a subtropical and semi–enclosed bay, provides an ideal breeding ground for many fish and shellfish. Five stations were investigated along the Bay. This area is under the influence of the Indian Ocean seasonal monsoons. Zooplankton was collected with vertical plankton tows using 100 μm mesh nets. Copepods dominated the zooplankton community followed by larvacea, cladocera and chaetognatha. Fifteen taxa of zooplankton were identified. Oithona nana and Euterpina acutifrons were dominated in the whole year and Larvacea showed a bloom in Northeast Monsoon. A Two–way ANOVA indicated that there were differences in abundance and biomass between sampling periods and between stations were significant. The peak zooplankton abundance in NE Monsoon could be due to winter cooling, with entrainment of nutrients into the upper layer producing phytoplankton blooms. The decline of zooplankton abundance and biomass in South West Monsoon and post–monsoon could be explained by decrease in chlorophyll a concentrations. The present result showed the composition and distribution of zooplankton differed between the monsoon seasons, resulted from changes in hydrographic conditions.
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