Recursos de colección

Aquatic Commons (37.792 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Biology

Mostrando recursos 1 - 20 de 46

  1. Morphological changes of Bunni (Barbus sharpeyi) larvae in laboratory conditions

    Khodadadi, M.; Ahmadi, S.; Dezfoulian, A.
    In this study, the early development of Bunni (Barbus sharpeyi) larvae was surveyed through morphological changes and measuring total length, standard length, head length, thickness of larvae, eye diameter and snout length. The initial period of the larval life can be divided into 2 phases: endogenous and exogenous food sources. During the first three days of the larvae development, there was a gradual yolk sac reduction until its complete absorption at the end of third day, indicating the necessity of exogenous feeding. From the fourth to eleventh day, the final development of the heart, gill, air bladder, fins and intestine...

  2. Comparison of muscular tissue composition of rainbow trout in brackish and different salinity waters

    Hosseinzadeh, H.; Masaeli, Sh.; Negarestan, H.; Alizadeh, M.
    In this research, controlled changes of rainbow trout muscular composition cultured in brackish water (14.1ppt) and freshwater (4.3ppt) was compared. Some 180 juvenile rainbow trout with a weight of 47.2±0.1g each were released in 6 polyethylene tanks with a capacity of 1.5m³. During the experiment, water temperature was kept constant. Feeding fish was conducted using common Faradaneh food and considering water temperature and fish biomass. After 126 days, fishes attained around 320±20g of weight, were sampled and taken to laboratory and the amount of protein, fat, ash, minerals and moisture in their muscle tissue were measured. Results showed amount of...

  3. Population dynamics of Barbus grypus (Heckel, 1843) and Barbus barbulus (Heckel, 1847) in Karoon River, south-west Iran

    Hashemi, S.A.R.; Mortazavi, S.A.
    Barbus sp. fish samples were collected during November 2007 to October 2008 from five landing stations in Karoon River: Gotvand, Shoshtar, Molasani, Ahwaz, and Darkhoin. During one year of study, more than 2000 specimens of B. grypus and B. barbulus were measured, mean±SD length values for this species were 37.94±8.18 and 43.62±10.27, respectively and maximum and minimum total length were 20-76cm and 20-94cm, respectively. Mean±SD of weight values for this species were 873.2±1092.45 grams and 778.59±725.97 grams, respectively and maximum and minimum weight were 52-11170 grams and 52-4675 grams, respectively. Growth and mortality parameters were calculated for B. grypus and...

  4. Effects of lecithin on growth and hematological indices in juveniles of Siberian sturgeon (Acipenser baeri Brandet 1869)

    Najafipour Moghadam, E.; Falahatkar, B.; Kalbassi, M.R.
    This study was carried out to evaluate the effects of dietary lecithin on growth performance and hematological indices in juveniles of Siberian sturgeon (Acipenser baeri). Fish with initial average weight of 32.9±0.3 grams were fed five isoproteic and isolipidic formulated diets with different soybean lecithin levels including 0, 2.5, 5, 7.5 and 10% in triplicate groups for 8 weeks. Results showed that lecithin supplementation to 7.5% significantly increased some growth indices such as body weight increase (BWI), specific growth rate (SGR), feed conversion ratio (FCR ) final weight (Wf), condition factor (CF) and protein efficiency ratio (PER). Also, increasing dietary...

  5. Comparison of the digestive enzyme activities in Artemia urmiana from nauplii to adult stages using different diets

    Lashkarizadeh, M.; Farhangi, M.; Agh, N.; Safari, O.
    Due to the importance of adult Artemia in aquaculture, information regarding the digestive enzyme activities variation with inexpensive diets has great importance in Artemia at different life stages. In this study, the effect of different inexpensive diets on digestive enzyme activities, including trypsin, amylse and lipase of Artemia urmiana was investigated in different life stages. The experiment was carried out with 5 treatments and each with 2 replicates over 15 days using 5 diets (wheat meal, common carp diet, soy meal, a mixture of soy meal and canola meal (compound diet 1) and a mixture of soy meal and wheat...

  6. The biomass of the medicinal red algae (Rhodophyta) in the intertidal zone of the Chabahar coasts

    Gharanjik, B.M.; Wynne, M.; Bangmei, Xia; Khajeh, S.; Keyanmehr, H.; Hosseini, M.R.
    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...

  7. Physicochemical and sensory quality changes of surimi from silver carp (Hypophthalmichthys molitrix) in frozen storage at -18ºC

    Jalili, S.H.; Hamrang Omshi, A.
    The physicochemical and sensory quality changes of silver carp (Hypophthalmichthys molitrix) surimi were studied during three months at frozen storage (-18ºC). The results showed that with increasing storage time of surimi from silver carp, TVB-N, peroxide value (PV) and expressible moisture increased significantly. TVB-N increased from 10±1 to 16.80±1.4mg%, Peroxide value from zero to 2.76±0.85meqO2/kg and expressible moisture from 4.23±0.13 to 6.32±0.13% during three months at frozen storage. Quality score of sensory evaluation, folding test and biting test were significantly decreased during storage period. Quality score of produced surimi gel decreased from AA to A, C grade and biting test...

  8. Temporal and spatial distribution of Thaliacea of the Urochordata around Hormuz Island, the Persian Gulf

    Eftekhar, M.; Savari, A.; Rezaei, H.; Mahoori, A.R.; Zare, R.
    The class Thaliacea belongs to Urochordata which branched from phylum chordata. Thaliacea have three orders: Doliolida (Cyclomyaria), Pyrosomatida and Salpida (Desmomyaria) and all are considered marine plankton, holoplankton and microphages. These animals feed by filtering water through their body. The aim of this research was to identify and study the ecological processes of the tunicates in coastal waters of the Hormuz Island in the Persian Gulf. We sampled water in an annual basis, starting from July 2007 and terminating in May 2008. Periodic sampling (Every 40 days) was applied and the use of plankton net with mesh size 300µm made...

  9. Assessing technical efficiency and return to scale in shrimp farming in Hormuzgan Province, Iran

    Karimi, D.; Kiani, G.H.; Eslami, F.; Liaghati, H.
    Due to increased shrimp production costs and consequent final price, shrimp farmers in Hormuzgan province have lost their advantage in the domestic and international markets. In this connection, technical and economic efficiency enhancement can be a way to decrease shrimp cost price. In this study, using data envelope analysis (DEA) and an input-oriented model, technical and scale efficiency of 26 shrimp farms were measured in the province in the year 2006. Results show that 54% of shrimp farms are technically inefficient, while minimum and average pure technical efficiency are 0.69 and 0.92 respectively. Also, 77% of shrimp farms have scale...

  10. The effect of different methods on fatty acid composition of Tilapia, Oreochromis niloticus, fillets

    Ghauomi Jooyani, A.; Khoshkhoo, Zh.; Motallebi, A.A.; Moradi, Y.
    Tilapia, a perch fish from Cichlidae family has witnessed a vast and fast growth in artificial culture due to simple and inexpensive procedures for the practice. One of the most important farm species is considered to be the Nile Tilapia (Oreochromis niloticus). The effects of different cooking methods on fatty acid composition and nutritional value of Tilapia fish fillet were evaluated. The cooking methods included: Red off, microwave, oven cooking, barbecue, boiled water and raw treatment. The protein content was assessed using the Kjeldahl method, moisture was evaluated through dry method, fat and ash through Soxhlet and electric furnace methods....

  11. The lethal concentration (LC50) of Zataria multiflora essential oil in fries of rainbow trout (Oncorhynchus mykiss)

    Sharif Rohani, M.; Haghighi, M.; Assaeian, H.
    This research was carried out to determine LC50 for Zataria multiflora essential oil in rainbow trout (Oncorhynchus mykiss) fries at 96 hours. In the process, we used the static O.E.C.D method for 180 rainbow trout fries weighing 5±1 grams in five treatments and one control with three replicates. During the experiments, the mean (±SD) of water temperature was kept at 16±1 C, dissolved oxygen (DO) was 7±0.2mg/l and pH was 8±0.4. We used 5- 25ppm of the essential oil and the results were analyzed using probit analysis procedure. The LC50 96h of Zataria multiflora essential oil was determined as 13.6ppm...

  12. Morphological characteristics and distribution of Ocypodidae at zoea one larvae stage from coastal waters of Khuzestan Province, Persian Gulf

    Sakhaie, N.; Savari, A.; Kochanian, P.; Nabavi, S.M.B.; Marammazy, J.G.; Doustshenas, B.

  13. The effects of exposure to sub-lethal copper and cadmium concentrations on biochemical factors of one year old Persian sturgeon, Acipenser persicus

    Zahedi, S.; Mirvaghefi, A.R.; Rafiee, Gh.R.; Mojazi Amiri, B.; Hedayati, M.; Makhdoomi, Ch.; Zarei Dengasraki, M.
    The aim of this study was to determine the 96h LC50 of copper and cadmium, and also, to evaluate the effects of their sub-lethal dose on stress factors in Persian sturgeon, Acipenser persicus. Obtained results from Probit analysis showed 96h LC50 values of 0.502 and 14.78mg/l for copper and cadmium, respectively. Also, in single sub-lethal exposures, 72 juveniles (130±19g) were exposed to 0.026 and 0.68mg/l of copper and cadmium in semi- static conditions, and some stress-related biochemical factors were assessed in 1, 7 and 14 days. According to the obtained results, plasma glucose and cortisol were increased (P<0.05) in experimental...

  14. Distribution pattern of branchial chloride cells in smolt Salmo trutta caspius fries of the Caspian Sea during freshwater adaptation

    Rajabi, H.; Khodabandeh, S.; Fallah, S.; Amirimoghadam, J.
    The immunolocalization of Na+ ,K+ -ATPase rich-cells (chloride cells) and their distribution pattern in smolt Salmo trutta caspius fries of the Caspian Sea weighing 5, 15, 25 grams during freshwater adaptation was studied in 2008. Gill samples were fixed in Bouin s solution, and after hydration, the samples were paraffinaized and sectioned. Na+ ,K+ -ATPase localization was performed using IgG 5 antibody and immunohystoshimy technique. In order to count cells in gill area, immunofluorescence light microscopy pictures was analyzed using Image Tool 2.1 software. Chloride cells were found on gill arch, lamellae and filament. Filamentary chloride cells and their total...

  15. The effect of different diets on production and population specific growth rate of the freshwater Cladoceran Ceriodaphnia quadrangula (Muller, 1785)

    Khanjani, M.H.; Farhadian, O.; Keivany, Y.; Ebrahimi, E.
    In this study, effects of five different diets including green algae, Scenedesmus quadricauda, mixture of S. quadricauda and baker's yeast, cattle manure, poultry manure, mixture manure (cattle + poultry, 1:1 ratio in weight) were examined on density, specific growth rate and doubling time of freshwater Cladoceran, Ceriodaphnia quadrangula population, at two high and low levels of food density with three replications. The results showed that the maximum population density (184 individuals/50ml), maximum specific growth rate (SGR) (0.18/day) and minimum doubling time (Dt) (3.85 days) were obtained when C. quadrangula fed with S. quadricauda at high density (50×104 cell/ml). In addition,...

  16. The effects of prebiotic oligofructose on hematological, serum biochemical parameters and liver enzymes of juvenile beluga (Huso huso)

    Hoseinifar, S.H.; Mirvaghefi, A.R.; Mojazi Amiri, B.; Khoshbavar Rostami, H.A.; Darvish Bastami, K.
    The aim of the present study was to investigate the effects of dietary oligofructose (1, 2 and 3%) on blood profiles of beluga Huso huso juveniles (18.77±0.76g). After 7 weeks feeding on experimental diets hematological parameters, metabolic products (cholesterol, glucose and total protein) and serum enzymes (lactate dehydrogenase, alkaline phosphatase, alanine aminotransferase and aspartate aminotransferase) were measured. Compared to the control group (0% oligfructose), oligofructose had no effects on red blood cell counts (RBC), mean corposcular volume (MCV), mean cellular hemoglobin concentration (MCH) or mean cell hemoglobin concentration (MCHC) (P>0.05). However, hematocrit (Hct), hemoglobin concentration (Hb) and leucocyte counts (WBC)...

  17. Heavy metals (Hg,Cd,Pb,Ni,Cu) concentrations in Euryglossa orientalis and sediments from Khur-e-Musa Creek in Khuzestan Province

    Parvaneh, M.; Khaivar, N.; Nikpour, Y.; Nabavi, S.M.
    Heavy metals contamination (Hg,Cd,Pb,Ni,Cu) in muscle of the fish Euryglossa orientalis and in sediments was assessed in 2007 in Khur-e-Musa Creek (Ahmadi and Ghanam). In total, 30 fish specimens and 18 sediment samples were collected and analyzed. Flame Atomic Absorption Spectrophotometer was used to determine contamination of the specimens with Cd, Pb, Ni, Cu, and cold vapor method was applied for Hg. Results showed 2.35, 0.99, 1.32, 14.48 and 5.71µg/g dry weight of the fish for Hg, Cd, Pb, Ni and Cu in muscle tissue, respectively. Metal levels in the muscle tissue were compared with standard values such as those...

  18. Study of biotic communities for artificial reef placement in Hormuzgan Province waters, the Persian Gulf

    Behzadi, S.; Salarpouri, A.; Darvishi, M.; Daghoghi, B.; Mortazavi, M.S.
    Persian Gulf waters (Hormuzgan Province) were studied from seasonally to determine the best locations for installation of artificial reefs. The area was stratified for 10 transects and each transect was divided into three stations: Station 1 for waters below 10m, station 2 for waters between 10 and 20m and station 3 for waters between 20 and 30m deep. Habitats of fauna and flora including communities of corals, seaweeds, sea cucumbers and sea grasses and sedimentation depth through scuba diving were studied in each transect and sub-transects. Sea grass communities existed in some spots within station 1 in Bandar Mesan, Bandar...

  19. Evaluation of stocking density on water quality parameters in rearing of Beluga (Huso huso)

    Rafatnezhad, S.; Falahatkar, B.
    The potential effects of stocking densities (1, 2, 4, 6 and 8kg/m -2) of Beluga (Huso huso) was investigated on water quality and growth factors of the fish. Feed was offered three times daily using a commercial diet to the juvenile fish at the average initial weight of 93.13±1.04g (±SE) for a period of 8 weeks. The final biomass was 4.0, 6.5, 11.0, 14.5, 17.1kg/m -2 from the lowest to the highest densities, respectively. At the termination of the experiment, the mean weight reached 362.4±6.9, 319.7±2.1, 267±9.2, 242.1±6.2 and 211.1±4.1 in densities of 1 to 8kg/m -2 , respectively. Results...

  20. Introducing three species of Echinoids (order Echinoidea) in southern intertidal zone of Qeshm Island, the Persian Gulf

    Izadi, S.; Ashja Ardalan, A.; Hosseinzadeh Sahafi, H.; Shookri, M. R.
    A one-year study (May 2007-April 2008) was undertaken to identify the echinoid species of intertidal sandy and rocky shores of the Qeshm Island. An intertidal sandy location and a rocky shore were surveyed in southern coasts of Qeshm Island, in northern Persian Gulf. Specimens were monthly collected along two 30m wide by 30 60m long (according to the tidal range) transects located approximately 300m apart, perpendicular to the sea, in each shore. Sampling was accomplished using 0.25m2 quadrat along each transect in the rocky shore, and by walking along nine 10×10-30m transects along each transect in the sandy shore. Three...

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