مجله علوم و فنون دریایی
سال:1393 | دوره: | شماره: |تعداد مقالات:8

Today, Bisphenol A is an industrial important chemical that is abundantly used as a primary raw material for the production of plastics and resin. BPA reaches the aquatic environment mainly through urban and industrial sewage effluents; thereby posing a potential threat to the organisms living in these ecosystems. In this study, effects of BPA onerythrocytic nuclear abnormalities (ENA) stimulus (MN Test) and liver DNA integrity (DNA Unwinding Assay), in male yellowfinseabream (Acanthopagruslatus) were investigated. For this reason, fish received intraperitoneal injections during a period of 2 weeks with 10, 50, 100 and 150 mg g-1 week-1 of BPA dissolved in coconut oil. Solventcontrols received the coconut oil whereas controls were not injected. The fish were sampled on day 0, 7 and 14. In order to evaluate cytotoxicity of BPA presented in blood, the erythrocytic nuclear abnormalities (ENA) frequency in yellowfinseabrem was determined.Our results demonstrated a significant increase in fish micronuclei frequency after the treatment with bisphenol A in comparison to the control groups and in dose dependent manner. In addition, the rate of liver DNA integrity was tested using the DNA alkaline unwinding assay. Results showed a decrease in the rate of liver DNAintegrityin treated fishes after 7 and 14 days of BPA exposure in comparison to the control group. In conclusion, results of the current project indicated that BPA has highgenotoxic and/orcytogenotoxic potential. It could be concluded that Micronucleus test and DNA strand breaks can be used as sensitive cellular and molecular indicators of exposure to genotoxic BPA.

In this study, the effect of vegetation on the reduction of the transmitted wave height and beach vegetation to absorb the force of the waves has been studied. Tests for the two layouts with rectangular spaced 5×5 and 10×10 cm, 3-state within 10, 30 and 40 cm, 5 sloping beach., 3, 5, 7 and 10% and 5 wave height of 1.5, 3, 4, 6 and 8 cm were used. In total, 175 different cases have been investigated. Dynamic pressure is measured at several points on the coast by a pressure transducer. The force exerted by the waves on the beach of the fuselage has been measured using electronically force meters (load cell) installed in the part of the flume is made movable. For all of shore slopes, the maximum of momentum absorption and wave height reduction was in pattern 5×5, and width, 40 cm. The force absorption for spaced 5×5 was more than 10×10. The average rate of force absorption, between 5×5 and 10×10, was 1.5.

This research was performed to introduce a standard protocol for enrichment of Artemia urmian with Canola oil. Artemia urmiana nauplii were enriched at three densities (50000, 100000 and 200000 nauplii L-1) and three concentrations of Canola oil (0.1, 0.2 and 0.3 g L-1). Their effects were evaluated on survival, total length and profile of fatty acids at 6, 9, 12, 15 and 18 hours after the onset of enrichment. Cysts of A.urmiana were hatched according to the standard method. A.urmiana nauplii were stocked at above densities in 7 L cylindrical containers. Canola oil emulsion was added at concentrations of 0.1, 0.2 and 0.3 g L-1 at the beginning and 12 hours after the onset of enrichment. The results of analysis showed that enrichment of A.urmiana with 0.3 g L-1 Canola oil at 100000 nauplii L-1 for 18 hours was considered as the best treatment. Artemia nauplii enriched in this treatment had significantly higher levels of (n-3) PUFA and survival and minimum total length comparing to other treatments. The treatment had significantly higher levels of (n-6) PUFA than all treatments except treatment with a density of 50,000 nauplii L-1 with 0.1 g L-1 Canola oil for 18 hours.

This study was done to identify larval stages and biodiversity of Dendrobranchiata planktonic communites in artificial reefs of Khuzestan coasts (Bahrekan area in Northwest Persian gulf) for one year from May 2011 to April 2012 monthly basis. Sampling was conducted using a plankton net with a spring 300 micrometers. Totally, from two superfamily: Penaeoidea and Sergestoidea, 3 families: Sergestidae, Luciferidae, Penaeidae were identified. From Penaeidae family, Metapenaeus affinis, Penaeus indicus and Parapenaeopsis stylifera species, from Luciferidae family, Lucifer hanseni specie and from Sergestidae family, Acetes sp specie were identified and introduced. Also larval density of identified species in different months and stations are calculated and determined Metapenaeus affinis specie (With the average of number per cubic meter in 1029±830) from Penaeidae family account for larval density is maximum in September. Finally, two abundance peak was observed that the first peak was in September and the second peak was in November. The maximum of relative frequency percentage in Penaeoidea superfamily related to mysisI stage and 62 percentage. The results obtained indicate that the artificial structures are well managed nursery area for Penaeidae shrimp. The maximum average value of Shanon-wiener index was in November (1.36) due to the presence of all species in the same month. Simpson index was lowest in November, which confirms the above conclusion.