Recursos de colección

Aquatic Commons (39.496 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 358

  1. Morphology and phylogeny of Scrippsiella trochoidea (Dinophyceae) a potentially harmful bloom forming species isolated from the sediments of Iran’s south coast

    Attaran-Fariman, G.; Bolch, C.J.S.
    Phytoplankton cells and resting cysts of the species Scrippsiella trochoidea are regular and dominant components of the dinoflagellate flora of coastal marine waters and sediments around the world. This species is a common harmful bloom forming species in coastal waters. In this study, for the first time cyst of S. trochoidea were isolated from the sediments of southeast coast of Iran. Five strains from the germination of a single cyst belonged to S. trochoidea. In order to confirm identification of the species an excystment and encystment experiment, cyst and germinated cell morphology and plate pattern by light and electron microscopy...

  2. Genetic diversity of Mahisefid (Rutilus frisii kutum Kamensky 1901) in different rivers of the south Caspian Sea using PCR-RFLP

    Abdolhay, H.A.; Siti Khalijah, Daud; Rezvani Gilkolahi, S.; Pourkazemi, M.; Siti Shapor, Siraj; Javanmard, A.
    Mahisefid is the most popular fish in Iran with the highest economic value. The analysis of mitochondrial DNA has been extensively used as a marker for population genetic studies and is a powerful tool in studies of gene flow and evolutionary biology. Two hundred ninety four samples were collected from Sefid Rud River (100), Lamir River (98), Shir Rud River (48) and Tajan River (48) during spawning season. Out of 24 enzymes tested, four enzymes, namely TasI, HaeIII, HinfI and HincII were selected for this study. In the present study, the haplotype and nucleotide diversity of Mahisefid in four important...

  3. On the record of the red cornet fish Fistularia petimba (Syngnathiformes, Fistularidea) in Jask Port, the Oman Sea

    Yasemi, M.
    According to the data recorded from Cadiz area located in the Mediterraneans (Cardenas. et al.,1997) the red cornet fish Fistularia petimba Lacepede,1803 is a large fish typically found along soft bottom coastal areas and usually at a depth of over 10m (Banon and Sande, 2008). Fistularia commersonii is often misidentified as Fistularia petimba Lacepede (Randall, 1992). Cornet fish distribute in the tropical waters of the Atlantic and Indo pacific. The north eastern limit of distribution is recognized in the Atlantic from Cape Blanc and Cape Verde Islands to Angola (Fritzsche, 1990). Besides, the geographic distribution ranges from tropical waters of...

  4. Ichthyotoxism in Capoeta capoeta gracilis (Keyserling, 1861) from west of Urmia (Marmisho Lake), Iran

    Ramin, M.; Shiri, S.; Doustdar, M.
    Fish egg poisoning is a public health hazard although usually the incident rate, mortality and fish species involved are not well reported (Halstead,1970). Four species of Cyprinidae in Iran have been suggested as ichthyotoxic by Coad (1979) .namely Abramis brama. Cyprinus carpio .Schizothorax zarudnyi and Tinca tinca and it was thought that other species may be discovered subsequently.Najafpour and Coad (2002) reported ichthyotoxin in the cyprinid Barbus luteus from Iran ,and the study records another species. The Cyprinid fish Capoeta capoeta known as Siah mahi or gara balig in Iran.

  5. Genetic parameters estimation of growth in Salmo trutta caspius as a function of body weight and length

    Yousefian, M.; Hosseinzadeh-Sahafi, H.; Golshahi, H.; Laloei, F.; Tagavi, M.; Taheri, A.; Seidanloo, Y.
    There is no available adequate information on the biology and genetics of the Caspian salmon (salmo truta Caspiu) living in the Caspian Sea with other species such as common carp families, sturgeons and etc., therefore we are interested in knowing whether selection for rapid growth rate in salmo trutta Caspius will potentially lead to correlated genetic response in body weight and length. The potential for correlated responses was evaluated by the heritability estimation, estimating heritabilities of body weight and length. The genetic parameter estimations were obtained for different stages of growth from 5400 fish consisting 27 unrelated families that reached...

  6. Changes of fatty acid profiles in fillets of Cobia (Rachycentron canadum) during frozen storage

    Taheri, S.; Motallebi, A.A.; Fazlara, A.; Aghababyan, A.; Aftabsavar, Y.
    In this study changes in fatty acids profile during frozen storage at -18°C of Cobia (Rachycentron canadum), caught from the Persian Gulf (Bandar Abbas) were studied. Changes in saturated fatty acids (SFAs), monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), EPA+DHA/C16, n-3 PUFA/n-6 PUFA (n-3/n-6) and polyunsaturated fatty acids /saturated fatty acids (PUFA/SFA) were investigated during a six- month storage at -18°C. Eighteen fatty acids were found in Cobia, with higher percentage of saturated fatty acids (46.07%), monounsaturated fatty acids (33.72%) and polyunsaturated fatty acids (15.44%). The MUFAs and PUFAs reduced from 33.72 to 26.26% and 15.44 to 10.78%, respectively....

  7. Mangrove vegetation and community structure of brachyuran crabs as ecological indicators of Pondicherry coast, South east coast of India

    Satheeshkumar, P.
    Baseline ecological studies of Pondicherry mangroves are important for monitoring, management and conservation of mangrove ecosystems. A brachyuran crab faunal assemblage at four stations of Pondicherry mangroves is described and monthly samplings were made during September 2008 – August 2009. Totally 22 species of brachyuran crabs belonging to 12 genera and 5 families were recorded crabs belonging to the family Portunidae and Ocipodidae are most dominant group represented by total of 16 species. Six species considered are as a commercially important and out of which, on three species Scylla serrata, Thalamitta crenata and Portunus sanguinolentus are catch large quantities from...

  8. Metal concentrations in razor clam Solen dactylus (Von Cosel, 1989) (Bivalvia: Solenidae), sediments and water in Golshahr coast of Bandar Abbas, Persian Gulf

    Saeedi, H.; Ashja Ardalan, A.; Hassanzadeh Kiabi, B.; Zibaseresht, R.
    In a complementary field study, the concentrations of some metals (Cu, Ag, Pb, Zn, Ni, Co, Mn, Fe, As, Cd, Cr, Mg and Ba) were measured in clam Solen dactylus, sediments and water collected at two stations (Park-e-Qadir, 56° 20/ E, 27° 11/ and Nakhl-e-Nakhoda, 56° 23/ E, 27° 10/ N) of Bandar Abbas coastal waters of the Persian Gulf in November 2008 and February 2009 showing different contamination levels. Although there is little information on metal concentrations in macro-benthic animals in this area, this study, for the first time, reports the accumulation of some metals in S. dactylus in...

  9. Ectoparasite infection of Carassius carassius in water resources of west Azerbaijan, Iran

    Rasouli, S.; Nekuifard, A.; Azadikhah, D.; Ahari, H.; Anvar, A.A.; Khodadadi, A.; Ghasemi, A.
    Various parasite species were found in Carassius carassius including Diplostomum spathaceum, Dactylogyrus sp.,Gyrodactylus sp. Ichthyophthirius multifiliis and Trichodinia sp . They were found in four rivers in West Azerbaijan Province (North-Western Iran) . A total of 207 live Carassius carassius from four rivers including Aras (72) Zariyneh (42) Nazlo (58) and Barandoz (35) were studied. Parasitological surveys were carried out on gills and external organs. The results showed that Diplostomum spathaceum (70.83%) Dactylogyrus sp. (38.88%) Gyrodactylus sp. ) 22.22%) Ichthyophthirius multifiliis (48.61%) Trichodinia sp. (8.33%) Chilodonella sp. (12.50%) and Argulus sp. (76.19%) were found in fish from Aras Rive so...

  10. Titration of the Iranian white spot virus isolate, on crayfish Astacus leptodactylus and Penaeus semisulcatus

    Motamedi Sedeh, F.; Afsharnasab, M.; Heidareh, M.; Shafaee, S.K.; Rajabifar, S.; Dashtiannasab, A.; Razavi, M.H.
    White Spot Virus (WSV) is currently the most serious viral pathogen of shrimp worldwide; it causes mortality up to 100% within 7-10 days in commercial shrimp farms. Infected Indian white shrimp Fenneropenaeus indicus samples were collected from Guatr shrimp site in Sistan and Baluchestan province in south of Iran and WSV infection was confirmed by Nested PCR. WSV was isolated from infected shrimp samples by centrifugation and filtration and multiplied in crayfish by intramuscular inoculation, the isolated virus was called WSV/IRN/1/2010. In order to determine the dilution resulting in 90-100% mortality in Penaeus semiculcatus, diluted virus stock in steps from...

  11. Effects of whey protein edible coating on bacterial, chemical and sensory characteristics of frozen common kilka (Clupeonellia delitula)

    Motalebi, A.A.; Seyfzadeh, M.
    The objective of the current study was to investigate the effects of whey protein coating on the quality of common Kilka during frozen storage. For this study, common Kilka was coated with 20% whey protein concentration. Non-coated Kilka also was used as a control. Coated and non-coated samples were then stored at -18 °C for six months. Bacterial, chemical and sensory properties of the samples were determined in each month. Results showed that Coliform, Escherichia coli and Pseudomonas bacteria contaminations were negative until the end of storage period in the covered samples. Total bacterial counts and Staphylococcus bacteria count were...

  12. Effects of different three live foods on growth performance and survival rates in beluga (Huso huso) larvae

    Mohseni, M.; Pourkazemi, M.; Hassani, S.H.; Okorie, O.E.; Min, T.S.; Bai, S.C.
    To determine the best live food and to reevaluate the optimal weaning period for beluga fish (Huso huso) larvae, seven experimental diets: Daphina (DP), Chironomids (CH), Gammarid (G), Daphina + formulated diet (DPFD), Chironomids + formulated diet (CHFD), Gammarid + formulated diet (GFD ) and formulated diet (FD) in triplicate groups were fed to 4662 sixteen-days-old larvae which were captured from the stock tank and randomly distributed into 21 tanks. The microdiets contained 48-50% crude protein, 12-13% crude fat, 9-11% moisture and 8.5-9.5% ash . After 25 days feeding trial, weight gain (WG), specific growth rate (SGR) and feed efficiency...

  13. Effects of organophosphate, diazinon on some haematological and biochemical changes in Rutilus frisii kutum (Kamensky, 1901) male brood stocks

    Mohammad Nejad Shamoushaki, M.; Soltani, M.; Kamali, A.; Imanpoor, M.R.; Sharifpour, I.; Khara, H.
    The acute toxicity and effects of diazinon on some haematological parameters of kutum (Rutilus frisii kutum, Kamensky, 1901) weighing 613.33 ± 157.06 g were studied under static water quality conditions at 15 °C ± 2 ºC. These experiments were carried out based on the standard TRC, 1984 method over 4 days, and controlled for the effective water physicochemical factors having pH ranges of 7-8.2, total hardness 300 mgl^-1 (CaCO3), dissolved oxygen 7 mgl^-1. The results showed that the 96h LC50 value of diazinon was 0.4 mgl^-1 and that the maximum allowable concentration (MAC) value of this toxin was 0.04 mgl^-1....

  14. The effect of marine fish cage culture on benthic communities using BOPA index in Ghazale Creek

    Jahani, N.; Nabavi, S.N.B.; Dehghan Madiseh, S.; Mortezaie, S.R.S.; Fazeli, N.
    The present work has been carried out to investigate the probable effects of fish cage culture on benthic communities as a pollution and stress indicator and to evaluate the biotic health condition using BOPA index, in Ghazale Creek (Khowre-Mussa - Persian Gulf). Monthly sampling from 4 stations was carried out from June 2007 to March 2008 (during nine months). Stations were selected from under the cage to 400 m distant (as control site) in Ghazale Creek. Three samples were taken at each station for macrobenthos and one for sediment grain size and total organic matter (TOM), using a 0.0125 m2...

  15. Evaluation of different dietary protein and energy levels on growth performance and body composition of narrow clawed crayfish (Astacus leptodactylus)

    Ghiasvand, Z.; Matinfar, A.; Valipour, A.; Soltani, M.; Kamali, A.
    Nine practical diets containing increasing percentages of crude protein (CP) and energy (30%, 35%, 40% and 300kcal/100g, 370kcal/100g and 450kcal/100g) were fed to narrow clawed crayfish (mean individual weight=17±2.3 g) during an 8 week feeding trial. Weight Gain, Feed conversion ratio (FCR), Protein Efficiency Ratio (PER), Net Protein Utilization (NPU), Daily Food Consumption (DFC) and body composition of tail-muscle meat of narrow clawed crayfish were determined. At the conclusion of the experiment, comparing the growth parameters in response to interaction between protein and energy levels demonstrated that dietary number 2 (30/370) resulted in higher WG, NPU, PER, and the lowest...

  16. Growth parameters, mortality rates, yield per recruit, biomass, and MSY of Rutilus frisii kutum, using length frequency analysis in the southern parts of the Caspian Sea

    Gheshlaghi, P.; Vahabnezhad, A.; Taghavi Motlagh, S.A.
    The growth and mortality coefficient of Rutilus frisii kutum, were estimated using length frequency data collected in southern waters of the Caspian Sea during October 2008 to April 2009. The following population parameters were evaluated: length-weight relationship, W = 0.004L 3.258, (r= 0.976) Von Bertalanffy growth constants, W∞ (g) = 4192.3, L∞ (cm) = 70.45, K = 0.2, per year t0 = −0.75 total mortality and its components, Z = 0.92, M = 0.36, F = 0.56 per year. The exploitation rate (E) was estimated about 0.6. The current yield per- recruit was estimated to be 279.15 g, which was...

  17. Growth and mortality of brown trout, Salmo trutta fario in Lar dam, Iran

    Fazli, H.; Azari, H.; Moghim, M.; Kor, D.; Nabavi Jelodar, E.; Taleshian, H.
    The length-weight relationship, age, growth parameters, sex ratio, mortality and exploitation rate of Salmo trutta fario were determined in Lar dam. The sex ratio (male: female) was 1:1.84 which differed significantly from the expected 1:1. The length-weight regression was (females) and (males) indicating a negative allometric growth for both sexes. Growth parameters were estimated as L∞ = 45.0 cm, K = 0.27 yr-1, t0 = -0.23 yr. The instantaneous coefficients of natural, total and fishing mortality were estimated as 0.40 yr-1, 0.75 yr-1 and 0.35 yr-1. The results showed that S. trutta fario is moderately a rapidly-growing species in Lar...

  18. Effects of different starter diets on growth indices of Caspian Kutum, Rutilus frisii kutum larvae

    Falahatkar, B.; Mohammadi, H.; Noveirian, H.
    Six different diets including two rainbow trout starters, Gammarus dry powder, shrimp dry powder, egg yolk dry powder and newly hatched Artemia were used in feeding of Caspian Kutum larvae. During a 4-week trial, larvae with a mean weight of 17.5 ± 4.7 mg were fed with three replicates and growth parameters were measured at the end of the experiment. Thirty fish in each experimental unit with 3 L volume were fed 6 times daily according to their satiation. Results showed that there were significant differences in the final weight, final length, body weight increase, voluntary feed intake and specific...

  19. Age, growth and length at first maturity of Otolithes ruber in the northwestern part of the Persian Gulf, based on age estimation using otolith

    Eskandari, Gh.; Savari, A.; Kochanian, P.; Taghavi Motlagh, A.
    Estimates of age, growth parameters, length-weight relationship and length and age at first maturity of the otolithes ruber are required for fishery management. We used counting annuli on the section of sagittal otoliths to age O.ruber from the Northwest Persian Gulf in south of Iran. Estimated ages ranged from 0 to 6 years, and maximum frequency of fishes was observed in age-group 1. The values of growth parameters L∞, k and to were calculated by von Bertalanffy model and the results were 67.57 (cm), 0.27 (year-1) and -0.43 respectively. Parameters b and an in length-weight relationship were calculated 3.19 and...

  20. The effect of artificial reefs on fish assemblage versus natural sites in the Bandar Lengeh-Iran

    Azhdari, H.; Ibrahim, Mohd; Arshad, Aziz; Shohaimi, Shamarina; Ajdari, Z.; Ibrahim, Zelina Zaiton
    Artificial reefs are used to compensate the destruction of marine ecosystems. In the present study, the effects of artificial reefs were compared to natural sites. For this purpose, five treatments including four different forms (Reef ball (R), Laneh Mahi (L), used materials (U) and R+L+U) of artificial reefs and one control were established. The reefs were deployed at Bandar Lengeh, the Persian Gulf. At each site, the fish sampling were carried out every three months for one year. According to data, significant differences (p<0.05) were found between the artificial reefs and the control sites in terms of Catch Per Unit...

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