Recent Submissions

  • Efficiency of fishing gear used for king fish fishery with the emphasize on gill nets in Oman Sea- coastal waters of Sistan and Baluchestn Province

    Hosseini, S.A.; Enayati, Sh. (2018)
    Iranian Scientific Fisheries Journal
    Efficiency of various meshes of gillnets and trolling gear was investigated for catching kingfish (Scomberomorus commerson) in coastal waters of Sistan and Baluchestan province in 2007. In gillnets with mesh sizes between 57 to 110 mm and netting of monofilamnet and multifilament, the size distribution of kingfish ranged between 40 to 78 cm of fork length, which all specimen caught were immature. In mesh size of 146 mm and 171 mm, the length range of the species was larger, in which the frequency of immature fish for the respective mesh sizes was 19 and 11. In general, most fish was captured by wedging in the all mesh sizes. The size range of kingfish captured by the trolling was between 52 and 147 cm, of which more than 50 percent of caught fish were immature. The proportion of kingfish catches in the gillnets of 57-110 mm mesh sizes is about 13% of the total catch composition, for which the mesh sizes are considered as the dominant gillnets for capturing the species in this area. The conribution of kingfish catches in 133, 146, and 171 mm mesh sizes was 1.1, 52.3 and 18.9% respectively, with a 146-mm mesh size is considered as a dominant gillnet for this species. The implementation of the ban on the use of 57 to 110 mm mesh sizes for exploitation of kingfish is mandatory, which the mesh size of 146 mm and above seems to be appropriate for responsible fishery of the species. However, recommendation of standard mesh size needs to be re-examined in field trials.
  • Effect of galacto oligosaccharide prebiotic on growth performance, survival and several of innate immunity parameters of rainbow trout (Oncorhynchus mykiss) larvae

    Ali, M.; Akbary, P.; Soltanian, S.; Gholamhosseini, A. (2018)
    Iranian Scientific Fisheries Journal
    Prebiotics are non-digestive food ingredients which beneficially affect the host by selectively stimulating the growth and activity of health-promoting bacteria in the intestinal tract. This experiment was conducted to evaluate the effect of dietary supplementation of galactooilgosaccharide on the growth performances, survival and several of innate immunity parameters of rainbow trout (Oncorhynchus mykiss) larvae for 60 days. In this experiment, 360 of larvae (with average weight of 0.13±0.01g) in 4 treatments and 3 replicates (n=30 in each replicate) in a completely randomized design was divided and fed with diets containing 0, 1, 2 and 3 percent galactooligosaccharide respectively. The present results showed that highest WG, SGR and PER were observed in the diet containing 2 and 3 percent of dietary galactoologosaccharide which had a significant difference compared with other treatments (p<0.05). The highest, survival, total protein, albumin and globulin levels were observed in treatments containing 2 percent of dietary galactooligosaccharide which showed a significant difference compared with other treatments (p<0.05). Finally, the present results suggest that diets containing 2 percent of dietary galactooligosaccharide could improve growth, survival and innate immunity responses of rainbow trout.
  • A survey on plankto an investigation on ecology of mudskippers in Hormuzgan coastal areas communities in Bandar Abbas coastal area

    Taherizadeh, Mohammad Reza; Dehghani, R.; Salarpouri, A.; Khodadadi Joker, K.; Mortazavi, M.S.; Akbarzadeh, G.H.; Pahpouri, A.; Seraji, F.; Ejlali Khanghah, K.; Behzadi, S. (Iranian Fisheries Science Research Institute, 2018)
    The most important habitats of mudskippers are muddy areas in tidal zone of tropical mangrove forests. Mudskippers are related to Oxudercinae subfamily of Gobiid fishes. Three most distributed species of Hormozgan mudskippers were Periophthalmus waltoni, Boleophthalmus dussumieri and Scartelaos tenuis. These fishes can be considered as euryhaline and eurythermal aquatic species, because they can tolerate a wide range of salinity and temperature. A research was done since september 2008 to september 2009 in two important mangrove regions of Hormuzgan (Tyab and Khamir) to determine some ecological characteristics of inhabited mudskipper species. Results showed that nitrate levels are significantly different between tidal lines and seasons (P<0.05). Maximum nitrite concentrations were recorded 53.2 and 92.5 µg/l in Khamir and Tyab respectively. The annual correlation matrix showed that a positive correlation between phosphate concentration and nitrite and silicate (P<0.05). Silicate concentration was very high, because of too low density of diatoms and radiolarians. Some species of diatoms, dinoflagellates, cyanobacteria and larvae of crustacea and echinoderms were observed with different density and diversity. Sediment composition of the studied areas were categorized in three classes (clay, sand and clay - sand). Polychaetes formed dominant group of benthic fauna in Tyab and Khamir areas. High density of capitellid worms was possibly related to some environmntal stress caused by activity of fishing and cargo vessels. It was not observed significant difference between fishes length in two areas (P<0.05); Mean lengths of P. waltoni, B. dussumieri and S. tenuis were calculated 9.85, 14.7 and 11.5 cm respectively. Spawning period of each three species in both areas were obtained from late winter to late spring based on gonadosomatic index values. Male to female sex ratio of P. waltoni, B. dussumieri and S. tenuis were calculated 1:0.45, 1:0.41and 1:0.74 respectively. Absolute fecundity of P. waltoni, B. dussumieri and S. tenuis were estimated 3558 ± 2202, 3952 ± 1030 and 6742 ± 1939 respectively. P. waltoni feeds mainly on fiddler crab, S. tenuis uses crustaceans and gastropods and B. dussumieri has a vegetarian diet.
  • The study of some limnological study of the Kan river in the catchment area of the Persian Gulf Martyrs Lake (Chitgar), Tehran trophic index in Anzali lagoon

    Bagheri, Siamak; Zahmatkesh, Y.; Ghane, A.; Sedaghatkish, A.; Nikpor, M.; Yosefzad, E.; Mohsenpor, H.; Rastin, R.; Shondasht, J.; Moradi, M.; et al. (Iranian Fisheries Science Research Institute, 2017)
    This study focused on identification phytoplankton, zooplankton, benthos, fishes and relationship between biotic and abiotic parameters at three stations in the Kan river during 2014. This study identified 19 phytoplankton taxa. The findings showed, the diatoms abundance were dominated in the river. The chlorophytes abundance were recorded the lowest abundance in this study. The nutrients and water temperature were the significant abiotic parameters to increase cyanophytes and chlorophytes abundance in the Kan river. This study identified 26 zooplankton taxa. The Rotatoria and Protozoa abundance were dominated in the Kan river. Based on CCA, there was no correlation between abundance zooplankton and abiotic parameters. The biodiversity index of plankton was between 1.8 and 2 and the lake situation is located in the mesotrophic category. The study of the Kan river fishes showed, only one endemic fish species Capoeta bohsei. The length (between 38 and 270 mm, average 144±86 mm) and weight (between 1.1 and 356 g, average 108.8±146.7 g) of the C. bohsei were varied during the study period. The 19 benthos taxa were identified. The Ephemeroptera was most abundant in the benthos groups. The classification of river based on biology indicator and environmental parameters confimed that water quality is located in the moderate category.
  • The study of establishment of rainbow trout culture and hatchery farms on Zayanderood’s River region in Caharmahal and Bakhtiyari Province

    Danesh Khosh Asl, Ali; Fallhi, M.; Khodaparast, S.H.; Mirzajani, A.; Ghane, A.; Babaee, H.; Nezam Abadi, H.; Daghigh Rouhi, J.; Mehdizade, Gh.; Abbasi, K.; et al. (Iranian Fisheries Science Research Institute, 2016)
    The aim of this study was to find the best location for establishment of rainbow trout culture and hatcheries farms on Zayanderood’s river region in Charmahal and Bakhtiyari province. This survey carried out over ten station along Zayanderood’s river. The result of physical and chemical analysis showd that the annual average of air temperature varied from 9.5oC - 10oC where the pH annual average value were between 7.5 and 8.8. the dissolve oxygen concentration in stations except in rainbow trout farm effluent were above 10 mg/l. the other chemical , pollutant as well as pesticides levels were under the limiting concentration for rainbow trout culture and Hatcheries activity. The plankton survey showed that the Bacillurophyta were the dominant group of phytoplankton where protozoa constituted the most abundant group of zooplankton the Benthic organisms sensitive to pollutant in particular Epirus were dominant group in all stations. In regard to fishes presence in river, five species of Ciprinidae, one species from Balitoridae and one species from salmonidae families were identified. The capacity for development of rainbow trout culture for tow phase period in Zayanderood’s river region with respect to self purification potential (self purification potential were determined from the oxidation of the effluent of the only active trout farm of the river region), minimum of 10 L/s water requirement for production of trout in concrete canal and pond system and 1 L/S water need for production in semi circular closed system were estimated to be 5202 metric tons.
  • The سtudy on health situation of shrimp Litopenaus vannamei broodstoock production in earthen pond and comparing with fiberglass or cement tanks

    Afsharnasab, M.; Ghaednia, B.; Dashtyannasab, A.; Mirbakhsh, M.; Kakoolaki, S.; Mehrabi, M.R.; Yeganeh, V.; Nazari, A. (Iranian Fisheries Science Research Institute, 2015)
    The investigation of health and diseas situation of shrimp broodstook (Litopenaeus vannamei) in Boushehr province in earthen pond and cancreat and fiberglas was carried out from May 2014 until July 2014 with collected 100 samples brood stook from earthen pond and 100 samples from earth and fiberglas thank.The clinical sign of samples documented in take history form and then the samples transport to Iran Shrimp Research Instituet in Bousheher. The bacterial and fungal studied was carried out with hemolymp, hepatopacreas and gill tissue and then the shrimp preserved in Davidson Fixative for histopathology. A part of uropoda also preserved in ethyl alcholo for PCR study and detecting viruses. The result showed 10 bacteria consist V.harveyii, V.parahaemolyticus, V.anguillarum, V.vulnificus, V.mimicus, V.damsela,V.nereis, plesiomonas shigelloides V.alginolyticus V.proteolyticus, in earthen pond and 5 bacteria consit ,V.alginolyticus V.proteolyticus ، V.parahaemolyticus، V. damsela ،V.mimicus were identified in fiberglas thank. In this study 10 fungi consist Penecilium, Asp. Niger, Asp. Flavious, Asp. fomigatus, Acromonium, Ulocladium, Mucor, Cladosporium, Alternaria, Rhizopus, and 5 of them were identified in both broodstock from earthen pond and fiberglas thank. However 6 parasite consist of zoothamnium, vorticella, Acneta, Ephelota, Epistylis, Epistylis and Apastomom identified in earthen pond and three of them were identified in fiberglas thank. In histoplatholgy some tissue showed the effect of vibrio infecting in different organs as well in gill and midgut and the PCR examined were negative for all viruses. Regarding the produce healthy broodstock we need excuted the High Health procdure.
  • Determination of dietary protein and energy level s and optimum lipid to carbohydrate ratio for Gattan (barbus xanthopterus) fingerlings

    Nikpay, Mansoor; Eskandari, Gh.; Bosak Kahkesh, F.; Amiri, F.; Edizadeh, M.R. (Iranian Fisheries Science Research Institute, 2012)
    This study was done is three phase ,to required suitable level of protein and energy and optimum carbohydrate to lipid ratio (B.xanthopterus) fingerling . Phase one: Determine of dietary protein and energy l eve in tanks (300 liters) treatment with triplicate e in different level of protein (25 ,30 ,35 percentage) and three level of energy (250 ,300 ,350 kcal/gr) the result showed that the best (GSR and WG) belongs to diet with protein % 35 and 300 kcal/gr. this experiment showed with increased of protein , SGR and WG increased and the one special level of protein with increased of energy level ,first SGR and WG increased (the most of SGR belonged 300 kcal/gr) ,and SGR decreased. Phase 2 : Determine optimum lipid to carbohydrate ratio in tanks (300 liters) In this phase with suitable level of protein and energy( protein %35 and 300kcal/gr) determined 5 ratio of carbohydrate and lipid (0.8, 2.8, 4.86, 8.8 ) in this phase best diet determined with 4/8 ratio , and 6/8 , 2/8 ratios were after that carbohydrate and lipid ratio. Phase 3: Determine optimum lipid to carbohydrate ratio in pond: In this phase, the result of thirty phase were like second phase. we determined that the best SGR and WG and WG % belonged to 4/8 carbohydrate and lipid ratio and 6/8 2/8 ratio were after 4/8 carbohydrate and lipid rate.
  • Survey of diversity, distribution, abundance and biomass of macrobenthic fauna in the southern Caspian Sea

    Hashemian, Abdollah; Soleimanroodi, A.; Salarvand, Gh.; Elyasi, F.; Nazaran, M.; Dashti, A.; Norani, A.; Eslami, F.; Gholami, M.; Kardar rostami, M.; et al. (Iranian Fisheries Science Research Institute, 2012)
    This project were investigated seasonally from march 2008 up to one year, in southern Caspian Sea iranian coast /Sampling was carried out at 8 stations of between 5 and 100 m depth and taken in triple with a 0/1m² van Veen grab/Total twenty four species and one family and one order were identified, presenting low dominance and frequency/ polychaeties 56%,oligochaetes 39% bivalves <1% amphipodes1% Cumacea and diptera and cirrepedia %1 of whole macrobenthos compositions/ Polychaetes and oligochaeta dominated, representing 95% of the whole fauna/Average of species were 11/8 species per grab/max 21 species / grab were found in Tonkabon stations at 100 meter depths and minmum 4 species/grab in 20 m in Bandar anzali /Maxmiun density were 4783 n/m^2 in spring and minmum 3177 n/m^2 in winter/Highest density were recorded in Amirabad stations and lowest in nooshar/ Maximum density showed in east, mimun in middle area of sea The biomass of benthos adventages in west/Average biomass of whole area were 6/932 gr/m^2/Mean total organic matter were 3/11±1/1 and silt- clay 62/92±6/12precent and Mean dissolve oxygen and salinity were 8/3±0/15 mg/l and salinity 12/2 ±0/4 ppm and water tempreture were 14/9±0/18ْC/ Mean grain size, fine sand, very fine sand, silt and clay contents were among the main factors related to the patterns of macrofaunal distribution, density and diversity and dominance of trophic groups.
  • A survey on effects of shrimp aquaculture on the coastal waters of Bushehr (Helleh region)

    Mirbakhsh, Maryam; Ghaednia, Babak; Najdian, Aida; Alboosharif, Ali; Esmaeili, Fariba; Soltani, Mehdi (Iranian Fisheries Science Research Institute, 2008)
    This survey was designed in the Helleh and Delvar regions, to understand effects of aquaculture industry on coastal waters of Bushehr, in 2003. In Delvar region, five stations were selected comprise; effluent canals of Delvar 18 and 14, sea (south and north of site), influent water (Piyazi bay). In Helleh region, two stations; effluent canal and Ramleh bay were selected. Sediment and water samples were collected from effluent canal, influent canal and sea during the 9 month period (before until after culture season). The variations of selected water quality parameters were controlled monthly. Results show that, the maximum amount of ammonium in Helleh region was 0.33 mg/lit and in regions of Delvar 18 and 14 were 0.19, 0.20 mg/lit. However the maximum amounts of phosphate in Helleh region was 0.26 mg/lit and in regions of Delvar 18 and 14 were 0.24, 0.23 mg/lit. Correlation coefficients assess between phosphate concentration of effluent canal and sea station (gate of Ramleh) in Helleh region was r=0.91 (α=0.01). Also correlation coefficients
  • Stock assessment of bonyfishes in the Iranian coastal water of the Caspian Sea (2004-2005)

    Abdolmalaki, Shahram; Ghaninezhad, D.; Saiyad Boorani, M.; Poorgholami Moghaddam, A.; Moradkhah, S.; Bandani, G.A.; Daryanabard, R.; Khedmati, K.; Rastin, R.; Taleshian, H.; et al. (Iranian Fisheries Science Research Institute, 2007)
    For gathering of data on biometry and catch statistics, 5 mobile working group in the regions of Anzali, Kiashahr , Noshahr , Babolsar and Torkmen were involved from the start (2004.10.23) to the end of fishing season (2005.04.10). Gathered data were entered to the computer based on species. For data analysis different methods were undertaken such as Bertallanfy equation for growth parameter Beverton and Holt for total mortality rates, pauly's imperical model for natural mortality rate and cohort Analysis for biomass estimation. Total catch with taking into account of poaching, was estimated 15140 tons reported by scientific committee of catch and fishing harbor relief of Iranian Fishery Company. The total recorded catch of beach seine cooperatives was 10644 tons that comprise 70.2% of the total catch. Total catch of Caspian Kutum was estimated 6612 tons that had 1856 tons (22%) decrease with comparison of the last year. Biomass of Caspian kutum in Iranian coastal Water of the Caspian Sea in 2003-2004 estimated about 20400 tons. The total catch of golden gray mullet was estimated 4425.6 tons that constitute 29.2% of total catch of bony fishes. Biomass of this species was estimated 12200 tons and based on this amount of biomass, Maximum Sustainable Yield (MSY) was calculated as 3577 tons. Long nose mullet comprised only 1.4% of the mullet catch. The catch of common carp in 2004-2005 fishing season continued its increasing trend and caught in amount of 3087 tons by beach seine cooperatives that had 2.2 fold increase in comparison of previous fishing season. Most of the catch occurred in Golestan province and was immature and undersize and the length frequency modes showed moving towards bigger size and older age groups in comparison of previous fishing season. The catch of pick perch in 2003-2004 decreased with comparison of the last year and estimated about 22.5 tons. Most of the catch of pick perch was immature and undersize. Approximately all of the catch is due to releasing of fingerling of this species by Fishery Company especially in Guilan province. Total catch of bream was estimated 27.4 tons and most of which was immature and undersize. Population of asp is critically endangered and the catch of this species is very low (500 kg). Restocking of this species must be considered by Iranian fishing company.
  • Survey of production per area of Fenneropenaeus (Penaeus) merguiensis and F. indicus in Hormozgan province

    Tazikeh, Esmaeil; Fourooghi-e-Fard, H.; Gharavi, B.; Karimi, H. (Iranian Fisheries Science Research Institute, 2007)
    This project was conducted to survey production per hectare and other growth index of fenneropenaeus merguinsis and F. indicus in zar abzy fram in earthen ponds of Tiab area Hormozgan province. In this research for obtain aims used with two treatment and 3 replication. Postlarvaes were stocked at density 20 ind/m^2. Shrimp were fed by imported pellet on the basis of standard feeding table. In order to obtain the growth rate and calculation of daily feeding shrimp become biometry twice a month. Some of the physico chemical factor such and pH, dissolved oxygen and salinity were measured twice a month too. The results showed that mean weight of fenneropenaeus merguiensis were about 16.76 gr with mean daily growth 0.013 gr/day and for F. indicus obtain about 11.44 gr with mean daily growth 0.09 gr / day too. The results showed that mean F.C.R and survival rate in treatment 1 and 2 obtain 4.1 and 10 percent 1.7 and 64 percent respectively. The results showed that propagation of F.merguiensis is feasible and it can a culture species if suitable food is available.
  • Study on meiobenthos abundance and their relationship with the condition of sediment in the northern creek of the Bushehr province

    Mirdar, J.; Nikouyan, A.R.; Karami, M.; Owfi, F. (2004)
    Iranian Scientific Fisheries Journal
    The frequency and distribution of meiobenthoses in northern Creeks of the Bushehr Province during autumn2000- Summer200I were studied for determining the condition of sea sediments using seasonal sampling. Samplings were carried out in 10 stations from Doube Creek to Bandar Genaveh Creek as well as a control station in the Persian Gulf. Totally, 4 taxa of meiofauna were identified that Ostracoda and Gastropoda with 29% and 18% had the maximum and minimum percent of abundance, respectively. The maximum percent of abundance in station No.10(control station at sea) with 20735 n/m2 and the minimum abundance in station No.2 (Creek of Farake)with 5320 n/m2 were observed. The maximum abundance of meiobenthos in spring with 167603 n/m2 and the minimum abundance during winter with 61365 nlm2 were determined. In addition, grain size, soil texture and total organic matter (T.O.M) of sediment in 10 stations were analyzed. Results showed that station No.10 with 11.79% had the maximum percent of T.O.M while the minimum T.O.M (3.87%) in station No.4 (Gasir Creek) was observed. The correlation of sampling station based on the abundance of meiobenthos was also analyzed.
  • Experimental study on histology of circumstance of wound healing process in common carp (Cyprinus carpio)

    Sharifpour, I. (2004)
    Iranian Scientific Fisheries Journal
    The present experimental research was carried out to study the histology the inflammatory response and circumstance of wound healing process in the inflicted skin and underlying muscle of common carp. A number of 30 fishes with average length of 22cm in a recirculating glass aquaria system, at an average temperature at 27°C, were used for this study. A surgical wound (1.5-2.0cm long x 0.5cm deep) without complication of secondary infections, was made by sterilized scalpel blade into the left dorsal muscle of each anaesthetized fish. At least one wounded fish was sacrificed and sampled at 30 minutes, I, 2, 4, 6, 8, 10, 12, 24 hours and thereafter at 2, 4,6, 8, 16, 24, 32, 40, 50 and 60 days after wounding. The samples were fixed in 10% buffered formalin and 5µ sections were prepared using standard histological method. The sections were stained by the standard H&E staining method. Also periodic acid schiff (PAS) with tartrazin were used for specific tissue features. The stained sections were examined using light microscope. Re-epithelialization of wounded epidermis was completed within 4 hours after wounding. Macrophage infiltration began at 2 hours, and myophagia at 6 hours. Fibroplasia and muscle regeneration were initiated at 2 days after wounding. After 16 days, epidermis was normal and dermis was completely linked. The wounded area restored its main components by 16 to 24 days after wounding. This study revealed that a healthy carp is able to have a rapid and effective inflammatory response and also high potential of repairing against surgical wound.
  • Natural feeding of johns snapper (Lutjanus johnii) in the Persian Gulf (Hormuzgan Province waters) Iran

    Kamale, A.; Valinasab, T. (2004)
    Iranian Scientific Fisheries Journal
    Since a little information is available in relation with feeding of Lutjanus johni, this study was conducted to determine its food diversity. 613 specimens were studied from May 1996 to July 1997 and their dietary regim was defined. In this study, capacity vacuous index (CV) and food preference (Fp) calculated for this fish. The study of stomachs showed that stomach of 44 fish were full, 27 semifull and 524 were empty. CV was obtained 88.4 and Fp for crustacean (55.6), fishes (44.3) and molusca (1.4). In particularly study, Fp calculated for crab (54.0), squilla (23.2), shrimp (20.2) and lobster (2.5). Ultimately, in this survey was found that this fish possibly is fast feeder and crustacean to be omposed their main food. Among crustacean, crab is main food.
  • Effects of different by catch reduction devices (BRDs) in shrimp trawlers in the Persian Gulf

    Pighambari, Y.; Taghavi, A.; Ghadirinejad, H.; Seyfabadi, J.; Faghihzadeh, S. (2003)
    Iranian Scientific Fisheries Journal
    The effect of different bycatch reduction devices in decreasing bycatch of commercial fish species with the length of less than LM50 (the length from which, 50% of them are matured) in shrimp trawlers were examined. The experiments were conducted in Persian Gulf (Bushehr and Hormuzgan provinces) during the shrimp season, years 2000-2001. In this study four types of bycatch reduction devices (Grid, Nafted, Fish eye and Square mesh window) were used. Double rig trawl was used, one of them as an experimental trawl and the other as the control. Different treatments like one device or two devices were installed on experimental shrimp net. After hauling the trawl, frquency of different commercial species with length less than LM50 was determined in both nets, and the results were tested with Paired Willcoxon test. The results have shown that although all the devices have a reductional effect on bycatch of the young and juveniles of commercial species, but the amount of reduction with setting Nafted and Grid, either single or combined with another BRD was significantly higher than the control one (P ≤ 0/05). The amount of by catch reduction devices with different treatment (different devices either single or paired) according to the season of the experiment were also tested with Kruskal- Wallis test, which shows significant differences (P≤0.05) between the frquency of young and juvenile individuals of some species during different experimental seasons. According to this study, by using Nafted and Grid devices in the trawl nets of all shrimp vessels during its season, about 400 to 500 thousand of juveniles and young individuals can escape from the nets.
  • Identification of Jarahee river fishes in Kohguilouye & Boyerahmad and Khouzestan Provinces

    Alizadeh Sabet, H.R. (2003)
    Iranian Scientific Fisheries Journal
    Primary studies of this project began in winter 1996. After an experimental cruise, main sampling stations were determined and through six cruises the fishes of Jarahee river collected from headwaters in Khouzestan and Kohguilouye & Boyerahmad provinces to Shadegan lagoon. Through the 11 main stations, 1135 specimen of fishes were collected by castnet, gillnet, electroshocker, hoke & line and river-trawl. Collection process had conducted during May, June, August, September, November of 1997 and February of 1998. After one year laboratory studies, collected fishes were identified by some ichthyologic methods. Identified fishes (20 genus and 27 species) belong to nine families of Bagridae, Balitoridae, Cyprinidae, Heteropeneustidae, Mastacembelidae, Mugilidae, Poecilidae, Siluridae, and Sisoridae.
  • Correlation of length and weight with mercury concentration in different tissues of Kutum Roach (Rutilus frisii kutum) in central south of Caspian Sea

    Forooghi, R.; Esmaeli Sari, A.; Ghasempour, S.M. (2007)
    Iranian Scientific Fisheries Journal
    We used Mercury Analyzer to assess possible correlation between length and weight of the Kutum Roach (Rutilus frisii kutum) and mercury accumulation in different tissues of the fish. We collected fish specimens from central south Caspian Sea from October to December 2005. After biometrical measurement of samples and sex determination, mercury concentration was assessed in muscle, liver and skin tissues of the specimens. The mean concentration of mercury in muscle, liver and skin tissues was 849.9, 670.9 and 493.7ng/g respectively. Statistical analysis of the results showed a significant difference between mercury amounts in different tissues (P<0.05). No significant difference was found between male and female fishes in terms of mercury concentration (P>0.05). The mercury amount in muscle of Kutum Roach was lower than permissible limits proposed by FDA (1004ngig).
  • Determination of maximum allowable concentration and LC50 96h of Sefidroud River sediments for Persian sturgeon (Acipenser persicus) fingerlings

    Yosefi Garakoei, M.; Nezami, Sh.A.; Mehdinezhad, K.; Khara, H.; Pazhand, Z.; Mohammadnezhad, M. (2006)
    Iranian Scientific Fisheries Journal
    The impact of Sefidroud River sediments on the fingerlings of Persian Sturgeon (Acipenser persicus) was studied in 2005. The tests were done in 20 liter aquariums each containing 10 Persian Sturgeons fingerlings weighing 3-5 grams each. We devised 6 treatments and a control with 3 repetitions in the four day investigation through which the lethal concentration (LC50 96h) of Sefidroud sediments were studied. During the test, physicochemical parameters of water such as pH, oxygen and temperature were measured as 8, 8.5mg/1 and 25±1°C respectively. The results showed that LC5096h and LC50 24h of sediments on Persian sturgeon were 15367.39mg/1 and 124882.04mg/1 respectively. We determined the maximum allow-able concentration (M.A.C) of sediments to be I 536.74mg/l .
  • The effects of diazinon on haematological indices and LC50(96h) of Acipenser nudiventris

    Khoshbavar Rostami, H.A.; Soltani, M. (2005)
    Iranian Scientific Fisheries Journal
    We treated 150 specimens of Acipenser nudiventris with diazinon and used 30 individuals as control to assess the haematological effects of the pesticide and LC50(96h) for the fish. The acute toxicity test lasting 96 hours was conducted on juvenile Acipenser nudiventris kept in aerated stagnant water contaminated with diazinon. The LC50(96h) values of diazinon for Acipenser nudiventris juveniles was 4.6 mg/i. The experimental groups of fish showed statistically significant difference in their erythrocyte, haemoglobine, leukocyte and differential leukocyte count (P<0.05). Acute toxicity effects of diazinon on the fish was recorded as lowered erythrocyte and lymphocyte count with a significant increase in developed neutrophile count (P<0.05). It is suggested that the change in erythrocyte and leukocyte count may have been caused as a result of disruption of haematopoiesis and a decrease in non-specific immunity level of the fish.

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