مجله علوم و فنون دریایی
سال شانزدهم شماره 2 (تابستان 1396)

In this present study genetic diversity of cuttlefish (Sepia pharaonis) populations were investigated using microsatellite markers. Total 51 samples were collected from Bandarabass and Bushehr regions. Tissue sample of arm tips (tentacle) were preserved in 96% ethanol alcohol until using in biotechnology laboratory of Khorramshahr University of Marine Science and Technology. Genomic DNA was extracted with CTAB method. The quality and quantity of extracted DNA was assessed by 1% agarose gel electrophoresis and spectrophotometry, respectively. Polymerase chain reaction conducted with 6 pairs of microsatellite primers. PCR products were electrophoresised on 8% polyacrylamide gel and stained with silver nitrate. These primers were shown 4 pairs of polymorph and 2 pairs of monomorp. Allele Sizes were measured in populations then genetic parameter were calculated using Arlequin and Gen Alex Programs and phylogenetic relationship was determinated and drawn using TFPGA Program. Result obtained showed genetic distance and resemblance distance is 0.282 and 0.754, respectively and genetic differentiation was present 0.031. The findings of present study showed low levels of genetic differentiation but significant between of populations and S. pharaonis were likely two different population. These findings provide useful information for conservation and management of this species in the Persian Gulf.

A feeding trial was conducted to evaluate the effect of replacing fish meal protein with fermented soybean meal (FSM) on the growth performance, feed utilization, body composition and digestive enzymes activity of yellowfin sea bream (Acanthopagrus latus) juvenile. Five isonitrogenic and isolipidic diets were prepared with levels of 0 (control), 100, 150, 250 and 300 g kg-1 FSM. Triplicate groups (20 fish per tank) of yellowfin sea bream with initial weight of 2.51±0.01 g were hand-fed to visual satiation at three meals per day for 56 days. The fish fed diets containing different levels of FSM had no significant differences regarding Final weight, Weight gain, SGR, FCR and Survival with control group. Whole body proximate compositions of fish were not affected by dietary FSM level. The activity of digestive enzymes in the intestine was not affected by dietary FSM level. This study showed that up to 30% fish meal in the diets of juvenile yellowfin (Acanthopagrus latus) could be replaced by fermented soybean meal.

This study predicates the prone areas for developing Avicennia Marina forests along the coastal areas of Hormozgan province by studying the oceanography features influencing these forests and using logistic regression models. Tidal areas, flooding level, salinity of water and waves were considered as independent variables. The prediction of prone areas was based on using logistic regression model and the validity of the model was studied by ROC test and Pseudo-R2 . The results of this study indicates that; firstly the maximum wave height, the average maximum flooding level and the level of sanity of water are significantly associated with the presence of Mangrove and the high level of parameters of ROC and Pseudo-R2 confirm the validity of the model. Secondly the maximum wave height was introduced as the main marine parameter influencing the Mangrove communities. Finally the eastern part of the Persian Gulf coast, the west coast of Oman, and a few small spots in the easternmost parts of the coastal zone of Hormozgan province, were found as the most suitable areas for developing Mangrove forest.

In this experimental, effects of phytaze enzyme and substitute fish meal with soy meal were studied in 8 weeks, on growth performance and carcass quality in beluga juvenile. The beluga juvenile (weight mean 80.65±2.16g) were distributed in 21 fibreglasses tank and feed with 7 diets that were contains different levels of soy and phytase. Experimental dietaries were prepared include control diet wherein was not use of soy meal and phytase enzyme and other 6 experimental dietaries in factorial method 2×3 include tow levels 70 and 40 percentage substitute fish meal with soy meal and three levels phytase (zero, 1000 and 2000 IU/kg). In the end growth tests, significant differences were found in growth performance (p

In the conceptual design of a submarine quick estimation of hydrodynamic coefficients of a body and appendages is needed. In these methods, formulas are given for different coefficients and for the control surfaces, using two-dimensional factor provided for hydrofoil in wing sections theory books, are suggested. A Critical point in using these coefficients of wing sections theory books is, these coefficients are calculated for far from the free surface and for near the free surface is needed to be improved. Then in In the present work, Based on the assumption of potential flow and boundary element method a computer program has been developed to calculate the coefficient of hydrofoils with various sections in near the free surface. results in submerged is in full compliance with experimental and numerical results and in the near the free surface, these results are consistent with good accuracy.

At this study, kidneys of 10 normal fishes have been studied macroscopic and microscopically. The kidneys were collected by autopsy and tissue samples were sectioned by routine paraffin embedding and stained by H&E and PAS. Macroscopic observation showed that the kidney in Barbus grypus situated in the ventral region of vertebral column. The kidney could be divided into; head, body and tail portions according to their relative position. Microscopic studies showed that the kidneys consisted of excretory portion and hematopoietic-lymphoid tissues. Anterior portion of kidney (head) had more Hematopoietic-lymphoid tissues than the posterior portion (body and tail). Hematopoietic-lymphoid tissue consisted of cells which were found in different stages of development to blood cells. Excretory portion of kidney parenchyma consisted of renal corpuscle and urinary tubules. In microscopic section of glomerulus, endothelial and mesangial cells and nucleated red blood cells were seen. The number of renal corpuscles in the posterior portion of kidney was more than the anterior portion significantly, while there was no significant difference between the average diameter of renal corpuscles in the head, body and tail portions of kidney. Urinary tubules consisted of neck segment, proximal tubule (first and second portion), intermediate segment and distal segment. The collecting ducts were situated after the distal segments. No significant difference was observed in the measured parameters between the males and females fishes in this study. Based on the results of this study, the kidney of Barbus grypus is very similar to other species of the family Cyprinidae, histologically and anatomically.

There is an increasing interest in the marine industry to use composites to improve the hydrodynamic and structural performance of naval structures. The materials used within the composite are commercially available, and it is important the development of the right mix of fibers, resin and laminate lay-up that provide the desired mechanical and environmental performance for marine application. In this paper, to improve the stiffness and control the geometry of the blades of a marine propeller made of carbon/epoxy genetic algorithm to determination of optimal stacking Sequence is used. Using this method will minimize the deformation of tip blades. The optimization process has executed by linking ABAQUS and MATLAB software. Optimal angles of blade propeller obtained by using this process.