جستجوی مقالات مرتبط با کلیدواژه « bandar abbas » در نشریات گروه « مهندسی دریا »

This study was carried out to determine the heavy metal content ( Pb and Cd) in muscle and liver tissues of Pomadasys kakaan   in Bandar Abbas during winter 2011 and summer 2012. After biometry of the fish, muscle and liver tissues were separated. The amount of Pb and Cd were measured by atomic absorption spectroscopy (Varian model GTA 100). Based on the results, the average concentration of Pb and Cd in liver tissues were observed to be 0.1334±0.0234 and 0.0255±0.0077 µg/g respectively and in muscle tissues 0.0439±0.0106 and 0.0041±0.0007 µg/g, respectively. The difference between the average concentration of Pb and Cd in liver and muscle tissues is significant (P<0.05). Average accumulation of Pb and Cd in liver and muscle tissues were not difference significantly between two seasons (P>0/05). The comparison of the results with permissible limits of WHO and EPA showed that the concentrations of these metals are low.

This study was carried out to determine the heavy metal content (Nickel and vanadium) in muscle and liver tissues of Carangoiedes malabaricus in Bandar Abbas during winter 2011 and summer 2012. After biometry of the fish, muscle and liver tissues were separated. The amount of vanadium and nickel were measured by the atomic absorption instrument (Varian model GTA 100). Based on the results, the average concentration of nickel and vanadium in liver tissues were observed to be 0.2650±0.027 and 0.566±0.0075 µg/g and in muscle tissues 0.2011±0.0387 and 0.0898±0.0170 µg/g of dry weight, respectively. In winter the average concentration of nickel and vanadium in liver tissues were observed to be 0.2552±0.0422 and 0.0712±0.0116 µg/g respectively and in muscle tissues 0.2791 ±0.0710and 0.1435±0.0273µg/g respectively. In summer the average concentration of nickel and vanadium in liver tissues were observed 0.2748±0.0356 and 0.0419± 0.0084µg/g respectively and in muscle tissues 0.1232± 0.0169and 0.0361±0.0070 µg/g respectively. The difference between the average concentration of nickel in liver and muscle tissues of Carangoiedes malabaricus is significant (p<0.05) but the difference between the average concentration of vanadium in liver and muscle tissues is not significant (p>0.05). The comparison of the results with permissible limits of WHO and EPA organizations showed that the concentrations of these metals are low.

To review the diet of Malabar trevally (Carangoides malabaricus) in the waters north of the Persian Gulf (Bandar Abbas area), fishing gillnet was used for fishing seasonally, from spring 2012 to winter 2012. 188 samples were taken randomly evacuated fishing. Samples of frozen fish were packed in polystyrene and were flown to Tehran and were transferred to the laboratory at the faculty of Marine Science and Technology of Islamic Azad University North Tehran Branch. Stomach contents analysis of 188 samples indicated that the fishes were main food in both females and males of this species %85 and %86 respectively and followed by subsidiary food which included crustaceans, %15 and %14 respectively. Among fishes, Leiognathidae were the main food (%53) , which followed by Engraulidae (%41 ), Mullidae (%3 ) and Gobiidae (%3 ). Among crustaceans, shrimp (%39) and crabs (%61) were found in stomach contents. Statistical analysis on the preference feeding showed no significant difference between male and female fish. This species of fish is considered as low food consumption type and the highest percentage of empty stomach is found in spring and autumn.

To determine the heavy metals Zinc, Lead, Chromium and Copper in soft tissues of Thais mutabilis (gastropod) in three transect of tidal coast of Bandar Abbas, sampling was done in winter of 1389 (2011). Each Transect had three stations; Upper, mid and lower tidal zone. Sampling was done randomly with 0.5 square meter quadrate. Each area was sampled 9 times. The samples were analyzed for determination of heavy metals (Zn, Pb, Cr, Cu). The results showed that in the gastropod, zinc (577/18 ±438.9 ppm) was at the highest concentration between the heavy metals and Lead (0/17±0/6 ppm) was at the lowest. Generally, the highest concentration of Zinc (9/438±18/577), Lead (8/0±67/0) and Chromium (8/0±23/1) in soft tissues of gastropod was in Golshahr jonobi station, and the highest concentration of copper (6/134±77/88) was in the Posht shahr station. Statistical analysis showed that there was a significant difference (P≤0/05) in the concentration of chromium metal in soft tissue of gastropod in Golshahr jonobi transect with Soro. However, there is no significant difference between the concentrations of lead, copper and zinc in samples of soft tissue of gastropod in each transect (P≥0/05). The concentration of lead and chromium in this aquatic environment is lower than admissible range (WHO, 1985). It shows that the input of pollution containing these metals to this environment is low. The concentration of heavy metals such as zinc and copper is higher than admissible range (WHO, 1985) in every 3 transect. The result of bioaccumulation of heavy metals (Zink, Lead, Copper, and Chromium) in soft tissues of Thais mutabilis (Gastropoda) exhibited the following order: Zn> Cu> Cr >Pb.

In this study chemical composition (protein, fat, carbohydrates, fiber, Ash) and mineral elements (Fe, Mg, Ca, K, Na, I, P, Se, Mn, Zn, Cu) in the red algae Hypnea flagelliformis of Persian Gulf coast in winter 2010 and spring 2011 were analyzed in triplicates. Results showed that amount of energy in100 gr of  red algae H. flagelliformis in spring  was 179. 962 kcal and in winter it was169.872 kcal. Chemical analysis of H. flagelliformis red algae in winter showed that average amounts of protein, carbohydrates, fat, fiber and ash were %15.366 ± 0. 0283 ,%25.851 ± 0.12037,%0.556 ± 0.0351, %0.976 ± 0.0045  and %14.873 ± 0.040 dry weight respectively. Also in spring amounts of these factors were %17.851 ± 0.0045, %26.3003 ± 0.025, %0.3733 ± 0.0057, %1.177 ± 0.052 and %15.263 ± 0.0416 dry weight respectively. Most protein, carbohydrate and fiber belonged to spring algae. This is considerable because of high amount of protein in red algae than green algae and brown. The analysis of  red algae H. flagelliformis showed  that  the average amount of  this elements in winter was respectively, Fe (290.76 ± 0.1527), Mg (1286.6 ± 2.516), Ca (2618.6 ± 0.577), K (1638.9 ± 0.776), Na  (1854.3 ± 2.081), I (6.338 ± 0.2749), P (56.3 ± 0.3), Se (44.7 ± 0.3605), Mn (4.94 ± 0.305), Zn (2.16 ± 0.208) and Cu (1.16 ± 0.0251) mg  per 100 gr of dry  matter. The amount of these elements in spring, was  Fe (233.9 ± 2.891), Mg (1028 ± 2) , Ca (4356.3 ± 2.516) , K ( 1977.6 ± 5.631) , Na ( 2898.6 ± 0.577) , I (7.16 ± 0.05715) , P (53.6 ± 0.3) , Se (40.7 ± 0.2) , Mn (8.05 ± 0.02) , Zn (  5.2 ±0.173) and  Cu( 1. 43 ± 0.0378) mg  per 100 gr of dry matter respectively. results showed that there is a significant difference between the average chemical composition, macro elements and micro elemans in winter and spring (P<0.01). Average iodine elements in two seasons didn’t show significant difference (P>0.01). The results of chemical analysis in the red algae Hypnea flagelliformis  suggest  more  investigations in case of high level of  Iodine, Selenium, Iron, Magnesium, Calcium, Sodium, Potassium as a good supplement.

The present study has investigated polychaete worms in a muddy-sandy shore in Bandar Abbas in two sites. The first site which was receiving urban sewage of the city and was next to Terminal was named "Terminal". The second site was next to Goharshad Hotel and was named "Goharshad". Present research was conducted in a one year period starting from July 2005 until June 2006 on a monthly basis. Sampling was done using a hand corer. Results showed that five families of polychaete worms, comprising 6 species, were present as macrofauna in the sites. The identified families were: Nereididae, Nephtyidae, Spionidae, Capitellidae, and Glyceridae. The family Spionidae was most diverse while Nephtyidae were the most abundant family. Results indicated that the polychaete worms were relatively sparse. This was more considerable in high intertidal areas. Statistical analysis showed no significant difference between the two sites (p>0.05). Also it was clear that main habitat for the polychaete worms is low intertidal zone.

In this study, concentration of Cd ,Pb ,Hg & Fe  was determined in muscle of eighteen kind of Otolithes rubber caught from fisheries stations in Bandar Abbas in Summer 2009 and Winter 2010.Concentration were compaired with their MRL(max.permissible residual level) in international standard. After preparation of the sample and digestion by AOAC methods,concentration of (Cd ,Pb ,Hg & Fe) was determined using an Atomic Absorption Spectrophotometer . Mean fish weight was 520.05g and the mean (Cd ,Pb ,Hg & Fe) in the muscle of samples were 0.015,0.02, 0.11, 4.02µg/g dry weight ,respectively. Positive correlation between weight and concentrations of Cd ,Pb ,Hg & Fe in the muscle (µg/g dw) were observed   (P< 0.05).  There were significant differences between concentration of Cd ,Pb & Hg in seasons  (P<0.05).  Based on the result, Cd ,Pb ,Hg &Fe content found in the studied fish samples were not significant. The amount of these elements in this kind of fish is less than MRL of WHO, NHMRC, MAFF and FDA.

Sea pens or pennatulaceans are a highly specialized group of anthozoan coelenterates. They are bentic sessile animals. Sea pens were collected   by wading at low tide in inter tidal zone From Bandar Abass Costal area in autumn 2009.Sea pens were studied by morphologically trails as well as espiculs .  Sea pens   identified by classification keys and also acid digestion method, and samples were sent to academic center of California for conferm ation. Comparing identification keys genus from Virgularidae family was identified, it consisted of     Virgularia  gustaviana  . Sea pen,s distribution showed a patchy form in the   intertidal zone. Sea pen,s biomass was   determed to be 10.77 g/m2 in Souru Estuary. Sea pens contain large quantities of lipids in their tissues; these lipids may be either structural or for storage .in this study, lipid percentages of Virgularia gustavianawere measured and percentage of sterol profile  was assessed. Total lipid of Virgularia gustaviana was 21.96 percent and sterol profile which was5680.31mg/kg contain cholesterol 1910.38mg/kg that equal57.95 percent of total sterol and brassicasterol ,campestrol ,campestanol ,stigmasterol ,beta-sitosterol  were measured.  Fatty acid profiles was measurd by GC-Mass and Heptadecan 44.25 % beta.-Bisabolene ss Cyclohexene'1,18.16 %, and Metyl arachidonate 54.17 % was assessed. This research is first step in sea pen identification and it,s lipid components in Iranian coastal waters of   Persian Gulf. n was higher than preadults and adults. The measurement of liver total lipid showed that preadult lipid was more than adult and immature. Calcium staining in both liver and ovary tissues expressed that this element will increase during growth and development.