علوم زیستی دریا
negar beyrami; m z; p k; v y; h m
Abstract
This study was conducted to determine the effects of dietary supplementation of lysine and methionine on growth and nutrient utilization of Sobaity sea bream, Sparidentex hasta. Therefore, 180 juvenile fish with an initial weight of 31.38 ±1.4 g were distributed randomly among eighteen tanks. ...
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This study was conducted to determine the effects of dietary supplementation of lysine and methionine on growth and nutrient utilization of Sobaity sea bream, Sparidentex hasta. Therefore, 180 juvenile fish with an initial weight of 31.38 ±1.4 g were distributed randomly among eighteen tanks. Fish were fed to satiation three time per day(08:00, 13:00 and 18:00 hours) for 8 weeks with formulated diets containing six different levels of dietary methionine and / or lysine;Diet 1: a control diet without dietary amino acid supplementation; Diet 2: 100% methionine supplementation; Diet 3: 75% methionine and 25% lysine supplementation; Diet 4: 50% methionine and 50% lysinesupplementation; Diet 5: 25% methionine and 75% lysine supplementation and Diet 6: 100% lysine supplementation. The results of this study showed that use of dietary lysine and methionine supplementation in diet, significantly affected (P
Arash Shakouri; Seyed Mohamad Bagher Nabavi; Preeta Kochanian; Ahmad Savari; Alireza Safahiye
Volume 12, Issue 3 , September 2014, , Pages 51-62
Abstract
Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with ...
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Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with 100m2 area were sampled with SCUBA diving method in each region. Temperature had significant variation among the stations and seasons. There is a positive correlation (99%) between salinity and sea cucumber density and a negative correlation (95%) between turbidity and density. PCA indicated that salinity, pH, turbidity and temperature had 82.78% of all variance of the environmental factors and other factors did not exhibit such a relation with sea cucumber dispersion. Northern stations (Sepah and Kalantary) were located in same category in Fall 2007 and Winter 2008. These stations had the least pH and the highest salinity and turbidity in Fall and the highest pH and the least turbidity in Winter. Southern stations (Beheshti and Hotel Daryai) located in the same category in summer and fall 2007. These stations had the most pH and the least salinity in the summer and the most temperature and turbidity in the fall.
Mahsa Haghi; Ahmad Savari; Preeta Kochanian; Seyed Mohammad Bagher Nabavi; Mohammad Hasan Nami; Mohammad Zakeri; Mohammad Bodaghi
Volume 12, Issue 2 , April 2014, , Pages 3-15
Abstract
In this study the macrobenthose assemblage and their relationship with sediment texture was investigate by acoustic remote sensing. Macrobenthse in marine sediment plays an important role in ecosystem and any fluctuation in their communities will directly affect the abundance of fishery resources in ...
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In this study the macrobenthose assemblage and their relationship with sediment texture was investigate by acoustic remote sensing. Macrobenthse in marine sediment plays an important role in ecosystem and any fluctuation in their communities will directly affect the abundance of fishery resources in the sea. Acoustic remote sensing techniques investigate the vast seabed in rather small time interval. This survey site covers approximately 233km2. Geophysics data was derived by single beam echo sounder and differential global positioning system. The sediment texture and macrobenthose identification was done with grab sampling. The most study area is shallow and covered with mud. Dominant benthic animals were Cirratulidae, Amphionomidae and Paraonidae from Polychaetes. The sediment types have no important and significant effect on distribution and richness. Thus, in all stations with monotone sediment texture, there is similar species composition. Because of monotone geological characteristic in seafloor, macrobenthose assemblage patterns are not affected by sediment texture and grain size.
Shabnam Karimi; Preeta Kochanian; Amir Parviz Salati; Saad Gooraninejad
Volume 12, Issue 2 , April 2014, , Pages 65-57
Abstract
This study was done to investigate the macroscopic and microscopic structure of the ovary of Acanthopagrus latus and their changes during sexual maturation cycle from October 2011 to may 2011. 80 A. latus from Mussa Greek (North West of Persian Gulf) were captured and transferred to the laboratory. ...
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This study was done to investigate the macroscopic and microscopic structure of the ovary of Acanthopagrus latus and their changes during sexual maturation cycle from October 2011 to may 2011. 80 A. latus from Mussa Greek (North West of Persian Gulf) were captured and transferred to the laboratory. After biometry, gonads were removed, were weighted and fixed in Bouin's Fluid. Samples were dehydrated, clarified, embedded and sections were prepared. After staining with H&E these slides were studied under light microscopy. Gonadosomatic indices, macroscopic and microscopic changes in the ovary during different months were recorded. The minimum value of GSI were measured in May, (0.31 ± 0.01) while its maximum was seen in March (9.9 ± 3.1). Cyclic changes in ovarian maturity were divided into six stages, including immature, premature, mature, ripe, spawning and resting. A. latus had asynchronous spawning that was occurred from February up to March.
Ahmad Shadi; Ahmad Savari; Preeta Kochanian; Simin Dehghan Madiseh; Yaseman Gandomi
Volume 10, Issue 3 , September 2012, , Pages 69-78
Abstract
During one year survey (January to December 2007), Khouzestan coastal waters in the north west of Persian Gulf were examined to investigate juvenile fishes distribution, density and biomass. Monthly juvenile fish samples were caught using a 360 hp research vessel towing a 24 mm mesh size bottom trawl. ...
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During one year survey (January to December 2007), Khouzestan coastal waters in the north west of Persian Gulf were examined to investigate juvenile fishes distribution, density and biomass. Monthly juvenile fish samples were caught using a 360 hp research vessel towing a 24 mm mesh size bottom trawl. Trawling was carried out at 10 randomly selected stations. Distribution map for dominant species was prepared and biomass and CPUA was estimated in the study area. Highest and lowest CPUA was observed in October and December, repectively.Biomass fluctuations showed increasing trend during warm seasons.Significant correlation was recorded between environmental parameters (water temperature and salinity) with biomass and number of species per month in the study area.