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  • Biomass  (20)
  • 1
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    Distribution and abundance of high aquatic plants in the Gorganroud River, the Caspian Sea basin, Iran (2017)
    Details
    Publication Date: 2021-05-19
    Description: The distribution and abundance of high aquatic plants in the Gorganroud River was examined at five stations in four seasons (20 samples) over one year period during 2009-2010. We identified 21 species of aquatic plants from 21 genera, belonging to 9 families. These species were determined as 3 halophytic species (14.2%) and 18 high aquatic plants (85.7%).The highest species diversity was observed at Khajenafas, Aq qala and Chargoli stations(17, 13 and 11 species) respectively, The highest biomass of high aquatic plants were recorded in summer (for Inspection and Chargoli stations 11.5 and 10.1 g.m-2, respectively) and autumn (for the station of Inspection was 8.5 g.m-2 dry weight). The most dominant species were different in the investigated stations. At station 1 species Tamarix kotschyi, at station 2 species Juncus acutiflorus, at station 3 species Hordeum murinum hudson, at station 4 species Salicornia europaea L and at station 5 Juncus acutiflorus species were dominated.
    Description: Published
    Keywords: High aquatic plants ; Distribution ; Abundance ; Aquatic plants ; Biomass
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.287-295
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  • 2
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    Biomass estimation and distribution of Sargassum glaucescens in the Oman sea (Iranian coastline) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The brown algae of Sargassum glaucescens is found all along the coastal waters of Sistan and Balouchestan province in the Oman Sea. This species as a raw material can be used in different industries and is considered as an economical marine resources. In order to determine the distribution pattern and biomass of this species eleven growing regions were surveyed from Gwatr area in east and Miedany in west. The sampling were carried out monthly in inter-tidal zone and seasonally in subtidal zone. After sampling, the wet-and dry weight, mean length of taIls and number of branches were measured. Also, some physical and chemical parameters were measured. The results showed that brown algae is distributed all along the studied area in the second half of the year, meanwhile in the Gwatr area is found all seasons. The mean biomass of S. glaucescen,y in Gwatr, Chabahar, Tang and Galak was estimated 629.9, 235.5,314.4 and 127.5 g/m2, respectively.
    Description: Published
    Keywords: Economical ; Physical ; Chemical ; Sargassum glaucescens ; Brown Algae ; Biomass ; Distribution ; Species ; Sampling
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.43-56
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  • 3
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    The biomass of the medicinal red algae (Rhodophyta) in the intertidal zone of the Chabahar coasts (2017)
    Details
    Publication Date: 2021-05-19
    Description: Monthly sampling of red algae was carried out from April 2005 to March 2006 in Chabahar coasts (southestern of Iran) along Sistan & Baluchistan province coastal waters. We considered monthly periods of maximum tide according to tide tables. Then seaweed growth area in intertidal zones was determind through GPS, GIS and satellite imagery. Monthly sampling was conducted on a number of transects with equal distance and in randomly chosen 50×50cm quadrates. The samples were transfered to Offshore Waters Research Center’s lab and after cleaning and separating, the weight of each species recognized was measuerd according to the present references. The biomass of each species was obtained per area unit and in the total area after determing the average weight of species. During this research, 13 species of medicinal red algae were recognized, and the most important families included: Gelidiaceae, Gracilariaceae, Hypneaceae and Rhodomelaceae. Total biomass in the area of Chabahar Coasts were 865.2 tons and the monthly average was 72.1 tons. The maximum biomass was obtained in February as 149.8 tons (828g/m2 ) and the minimum biomass was seen in May as 16.3 tons (90.2g/m2 ). The maximum biomass belonged to Gracilaria corticata (%33.1) and the minimum biomass to Hypnea pannosa (%1).
    Description: Published
    Keywords: Marine algae ; Rhodophyta ; Hypnea pannosa ; Gracilaria corticata ; Biomass ; Medicinal ; Weight
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.103-114
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  • 4
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    Identifying the main factors affecting home consumption attitude to farmed fishes among Tehrani households (2018)
    Details
    Publication Date: 2021-05-19
    Description: Using reference books, monitoring buyers behavior and interviewing the experts, the effective parameters on home consumption behavior of farmed fish were identified and compiled as a questionnaire. After the reliability and viability evaluation the questionnaire was filled randomly in the spring of 2008 for 295 households of different localities in Tehran. The allocation of questionnaires was conducted based on the proportion of population in each locality. The degree of importance of effective parameters and their priority were calculated by Friedman test. The results showed that, quality, taste, smell and protein content of grocery basket are the most important purchasing factors among Tehrani households. However, those who use only farmed fish or those who do not use fish at all, after quality, smell has the highest importance, and in the fourth priority, instead of protein content of grocery basket, fish bone has higher effect. We suggest that to improve consumption of farmed fish, apart from quality, the strategies of deodorizing, taste improvement and decreasing fish bones, shall be taken into consideration during harvest, transport and fish processing.
    Description: Published
    Keywords: Processing fishery products ; Household statistics ; Marketing ; Fish culture ; Pisces ; Aquaculture economics ; Locations (working) ; Management ; Purchasing ; Quality ; Behaviour ; Taste ; Biomass ; Freshwater
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.87-96
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  • 5
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    Investigating distribution and biomass of two species of brown algae (Colpomenia sinuosa and Iyengaria stellata) in coastal waters of Hormozgan Province, southern Iran (2018)
    Details
    Publication Date: 2021-05-19
    Description: This study was performed to investigating distribution and biomass of two species of brown algae (Colpomenia sinuosa and Iyengaria stellata) in coastal waters of Hormozgan Province, Southern Iran. We sampled the algae over the years 2001 to 2002 in low tide periods using random 0.5 * 0.5 quadrats along a transect passing through six sampling stations. The highest distribution extent of the two brown algae species during winter and spring seasons observed which coincided with the highest fluctuation in their biomass. The maximum biomass of C. sinuosa in winter and spring was 142 and 75 grams/m2 respectively. For I. stellata, the maximum biomass in the two seasons was 208 and 189 Grams/m2 respectively. Analysis of variance showed a significant difference among the biomass of the two algae species over different months and seasons of the year (p〈0.05). Hence, we concluded that the species occurrence is seasonal and did not find a significant difference in the biomass of the two species obtained from different sampling stations. However, species appearance in different stations occurred in different months with the western stations showing a 1 to 2 months’ time lag compared to that of the eastern stations.
    Description: Published
    Keywords: Biomass ; Species ; Brown Algae ; Colpomenia sinuosa ; Iyengaria stellata ; Sampling ; C. sinuosa ; I. stellata ; Species ; Distribution
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.55-64
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  • 6
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    Correlation between changes of Chlorophyll-a and transparency in the Southern Caspian Sea (2018)
    Details
    Publication Date: 2021-05-19
    Description: Chlorophyll-a is a main pigment for photosynthetic proccess in marine phytoplankton and by it either amount of biomass can be estimated or can be considered as an index for trophic level of aquatic ecosystem. In year 1996,81 secchi disc depth were measured and 1601 samples of chlorophyll-a were collected seasonaly from the southern Caspian Sea. The results showed that average chlorophyll-a in seasonals of spring, summer, autumn and winter were 1.072,0.550, 1.848,0.966 mg/m3 and depth of transparency were 6.42,8.86, 5.62 and 5.22m, respectively. The statistical analysis showed a significant correlation (P〈0.01) between these two parameters in the southern Caspian Sea. More studies are needed to find out higher precise correlation.
    Description: Published
    Keywords: Chlorophyll-a ; Transparency ; Secchi Depth ; Phytoplankton ; Biomass ; Aquatic ; Ecosystem ; Samples
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.191-200
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  • 7
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    Limnological survay of Anzali wetland data during 1990-2003 by use of GIS system (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Anzali wetland at south west of Caspian located along of North West and southeast and with its unique feature were add on the Ramsar convention list in 1975. There were recorded a high rich of fauna and flora including 276 plant species, 23 reptiles and amphibians, 60 fishes, 26 mammals and 195 birds. Anzali wetland were encountered with numerous disorder with the eutrophication and the early dismissing. The first studies on Anzali wetland started by many international institutions in 1964. In this study the data of biotic and abiotic factors in Anzali wetland analyzed which belongs to different sites (15 to 38 stations) during 1991 to 2000 and were sampled seasonally or monthly in different years. The results showed the increasing trend of phytoplankton abundance from 7.9 to 66 million C./l. and the western part had the most abundant. The Cyanophyta had the most development than other 7 phylum observed in the area. In Anzali wetland identified 143 phytoplankton genus that 9 genus dominated in more than 80 % replicates and 7 genus had the abundance of more than 5 million cell/l. The Zooplankton abundant increased from 580 to 2200 ind./l. The Rotatoria had the most abundant followed by Copepoda. There was identified 104 zooplankton genus that 5 genus were dominated in more than 80 % replicates and 11 genus had the abundance of more than 30 ind./L. The chlorophyll a varied from 8.8 to 50.2 μg/l. and had a increasing trend after 1996, meanwhile it was measured higher than 25 μg/l in most of the stations. The results of benthic study showed that the Chironomidae and Tubificidae were observed more than other organisms which comprised 12.2 to 23.5% of total biomass of benthic organisms in studied period. The range of biomass was 1.1 to 7.8 g/m2. The ichthyologic survey showed presence of 60 species that 11 species were exotic. 28 species belong to freshwater, 17 species were anadromous and 8 species were resident in estuary. The highest and lowest fish catch were 640 and 288 ton in 1994 and 1999 respectively and it was about 500 ton at the end of period. The hydrochemical factors had the various fluctuation so that the nutrients parameters had a significant difference over studied period. Total nitrogen was varied from 0.78 to 1.41 mg/l and total phosphorus varied from 0.05 to 0.1 μg/l.. The oxygen dissolved amount was from 4.6 to 8.7. EC was between 3 to 5 ms/cm during September and October that indicated of Caspian water projection. According to geographic position of station, all biotic and abiotic data, were arranged. The data bank is used by Idrisi software to produce of necessary maps. Analysis of data showed that there must be a responsible department with a vast authority. Conservation and eutrophication prevention of Anzali wetland connect to special attention to catchment area and landuse management of the wetland. Also there is an urgent need for well-developed technologies and managements to reduce the organic pollution and its environmental impacts on the Anzali Lagoon.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Environmental ; Limnological ; Survey ; GIS ; Fauna ; Flora ; Cyanophyta ; Phylum ; Phytoplankton ; Zooplankton ; Chlorophyll a ; Biomass ; Species ; Hydrochemical ; Nutrients ; Dissolved oxygen
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 123pp.
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  • 8
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    The study on culture of rainbow trout (Oncorhynchus mykiss) by new design of Foster - lucas ponds (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Intensive culture of rainbow trout, usually done using several different methods.The objective of this study was to compare fish performance and welfare in a new design of Foster-lucas ponds (FLP) and a raceway ponds (RP) under field conditions. Currennt study was designed in two treatment with three repeats. Each pond was randomly stocked by rainbow trout fish with initial average weight of approximately 51±5 g. Stocking density was 120n/m3 during study. After 10 months of trial, fish fed diets with comertial diet (Chineh Company). Feeding operation conducted according to the manuals by consideration of water temprature, fish waight and biomas. During the 10 months experiment, the fish survival rate was high (97.39 and 98.05%). No significant differences in growth parametres were observed between RP and FLP, but in all parametres FLP was higher than RP Final weight was 0.99% higher in FLP than in RP. Water quality factors (Dissolved oxygen, PH) was better in FLP. The results confirm that when water quality is maintained in safe level ranges, growth rate of rainbow trout attained in FLS are comparable to those in RP.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Rainbow trout ; Oncorhynchus mykiss ; Fish culture ; New design of Foster-lucas pond ; Raceway ponds ; Culture ; Stocking ; Density ; Diet ; Feeding ; Temperature ; Biomass ; Growth ; Dissolved oxygen ; pH
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 39pp.
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  • 9
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    Feasibility of mass cultivation on Nannochloropsis oculata microalgae in tubular culture system (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: The presnt study has been carried out to evaluate the Nannochloropsis oculata culture performance in 100L columnar plastic bags under two chemical media (TMRL and CONWAY) and 3 light regimes in the controlled conditions. Algae used for the experiment has been provided through culture of primitive stock and by transferring it to 2 L glassy erlenmeyer and 15 L plastic containers (as intermediate stage) using CONWAY media respectively. Daily evaluation of algae concentration was carried out during the 18 days culture period. At the end of the study produced algae has been sedimented to be used for evaluation of the dried matter and algae biomass. Results of the study showed that the concentration of the algae culture was 22±3.34×106 cells. ml-1, at 8th day, and reached the concentration of 26.58±4.02×106 cells. ml-1 at the final day of the culture course. Although the results revealed the possibility of achievement of acceptable concentration for the N.oculta by the method adopted in the present study, but the achievement was not such favourable to be considered as an altenative for the common method. Nevertheless it could be considered as an alternative for the constrained situations. Moreover according to the results there was no significant algae concentration difference between light regimes (P〉0.05). Similar results were observed for the interaction effect of chemical media and light regimes. Meanwhile the ratio of dried matter obtained from algae under the TMRL media was significantly (P〈0.05) higher than that obtained from CONWAY media, but reversed results were observed for algae biomass. Light regimes were not significantly (P〉0.05) affect the algae production. Finally it could be concluded that the N.oculata algae could be successfully cultured in plastic columnar bags under the controlled conditions but the method adopted in the present study could be applicable in the improper conditions.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Micoalgae ; Nannochloropsis oculata ; Columnar plastic bags ; Light Regimes ; Chemical media ; Mass cultivation ; Tubular culture system ; Algae ; Sediment ; Biomass ; N.oculta
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 50pp.
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  • 10
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    Biomass estimation of seaweeds in the intertidal waters of the Oman Sea along the coasts of Sistan-o-Baluchistan Province (2018)
    Details
    Publication Date: 2021-05-19
    Description: Sampling and determination of seaweed biomass was carried out in the Oman Sea coasts along the intertidal waters of Sistan &Baluchistan province stretching 300Km from Guater area to Jood from October 2001 to September 2002. The regions covered included Guater, Passabandar, Beris, Kachoo, Ramin, Chabahar, Pozm, Gurdim, Tang, and Jood as sampling stations from east to west. The intertidal zone was determined by measuring and recording of geographical positions by GPS. Fifteen transects were aligned randomly each month with equal distance to the coast. All sampling attempts were made by applying quadrats 50t50cm in dimension. The samples were transferred to the lab and the weight of each species was measured after being cleaned, and identified. The biomass of each species per unit area and in the total area was obtained after determining the average weight of species. During the research, 69 species were collected, of which, 16 species were green algae, 18 species were brown algae and 35 species were red algae. There were some important families including green algae (Ulvaceae and Caulerpaceae), brown algae (Sargassaceae and Dictyotaceae) and red algae (Gracilariaceae, Gelidiaceae and Hypneaceae). Wet biomass of seaweeds in the total area of Sistan &Baluchestan coasts was 10286340.3 kg of which 2645192.1kg (25.7%) were green algae, 2955963.9kg (28.7%) were brown algae and 4685184.2 kg (45.5%) were red algae. The estimated monthly average was 264522.3, 295327.9 and 467089.7Kg for green, brown and red algae respectively. The maximum biomass was 15.4kg/m super(2) seen in Chabahar and the minimum biomass was 4.9kg/m super(2) obtained in Pozm.
    Description: Published
    Keywords: Coastal zone ; Phytoplankton ; Coastal waters ; Intertidal environment ; Ulvaceae ; Dictyotaceae ; Sargassaceae ; Gracilariaceae ; Gelidiaceae ; Caulerpaceae ; Hypneaceae ; Community composition ; Aquatic plants ; Biomass ; Seaweeds ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.101-110
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