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Open Access Article
1 - Popular dynamic study of Caspian sand goby, Neogobious fluviatilis pallasi in the south-west coastal of Caspian Sea by morphological characteristics
Abstract Caspian sand goby, Neogobious fluviatilis pallasi belongs to Gobididae family that has important role in food cycle of Caspian Sea because of their high population. This study was carried on population of Caspian sand goby on the southern west coastal of Caspi MoreAbstract Caspian sand goby, Neogobious fluviatilis pallasi belongs to Gobididae family that has important role in food cycle of Caspian Sea because of their high population. This study was carried on population of Caspian sand goby on the southern west coastal of Caspian Sea from October 2005 to September 2006 for 1 year. Samples were collected from 4 stations (Astara, Anzali, Chamkhaleh and Chaboksar coasts) from 0 to 15 meters of depth, monthly, by bottom trawl. Analysis of differential functions of morphological characteristicsshowed 51.3%, 28.4% and 20.3%, respectively. Percentage comulative of DF1 and DF2 was 80% which is indicative of inter group changes. Detective figures of two functions showed that studied samples in Astara station was completely different from other regions and was similar to Anzali station. The stations of Chamkhaleh and Anzali were the same. Chaboksar station was a separated group, too. Analysis of differential functions for traits in mind include an average of 86.3% of population, most of which belongs to Astara station with 93.3% and then Anzali with 90% and The lowest number belonged to Chamkhaleh with 79.3%. The results showed that Neogobious fluviatilis pallasi has three different populations on the coasts of Guilan province which include Astara, Anzali-Chamkhaleh and Chaboksar populations. Manuscript profile -
Open Access Article
2 - The effect of GnRH (ovafact) on process of sexual maturation in farmed stellate sturgeon (Acipenser stellatus) brood stock
Abstract Stellate sturgeon (Acipenser stellatus) is one of the important commercial sturgeon fishes of Caspian Sea. In order to study the indices of stress hormones in culture brood stock during spawning period and their relation to success or failure in artificial rep MoreAbstract Stellate sturgeon (Acipenser stellatus) is one of the important commercial sturgeon fishes of Caspian Sea. In order to study the indices of stress hormones in culture brood stock during spawning period and their relation to success or failure in artificial reproduction of these fishes, blood sample were taken from 11 cultured eight years old brood stock (which included 5 female and 6 male). The study was carried out at sturgeon research of Dr. Dadman in spring of 2006-2007. After analyzing the morphological and physiological characteristics of brood stocks, induced reproduction was carried out by injection of GnRH hormone (female were injected twice with total dose of 10µg/kg. The interval between the first and second injection was 12 hrs. The males were injected once using a 15 µg/kg dose. After the injection, two blood samples from male (0 hrs and 6 hrs after injection) and three blood samples from female (0 hrs/12 hrs and 24 hrs after the injection) were taken to analyze the biochemical and hormonal parameters. Result obtained show that the concentration of cortisole levels (187±30.89 Ng/kg) 24hrs after injection in female brood stock in which ovulation had occurred compared with the once without ovulation showed a significant relationship. On the other hand the concentration glucose (96.66±9.33mg/dl) 24hrs the injection in male brood stock in which spermiation had occurred compared with the once without spermiation showed a significant relationship. we can conclude that there was a significant difference in concentration of cortisole and glucose in female and male brood stock, respectively which have been successfully induced to spawn in comparison to once in which induction of spawning has not been successful. Manuscript profile -
Open Access Article
3 - The effect of Metasistox on mortality and haematological indices of beluga, Huso huso
Abstract The acute toxicity and effects of Metasistox on some haematological indices of Beluga "Huso huso" with 4.28±0.56g mean body weight was assessed following the O.E.C.D. direction and performed statically in 20.27±2.05˚C. The 96h LC50 value of metasi MoreAbstract The acute toxicity and effects of Metasistox on some haematological indices of Beluga "Huso huso" with 4.28±0.56g mean body weight was assessed following the O.E.C.D. direction and performed statically in 20.27±2.05˚C. The 96h LC50 value of metasistox for beluga juveniles was 1.3362 .Therefore the MAC value of metasistox in natural waters for bluga was .1336 mg.l-1. According to the table of sorting the toxicity of insecticides, metasistox was Toxic for beluga .The following clinical symptoms were observed in this study consisted of lordosis and neural paralytic syndrom in fish exposed to this pesticide. Some abnormal reactions such as losing the balance and swimming in a half circle, expressive pigmentation mainly on the dorsal part and block of respiration movements were seen in these juveniles. Examination of haematological indices was performed on control and experimental specimens of beluga with 17.1 g mean body weight after 96h exposure to metasistox in concentrations lower than LC50 96h. The experimental group of bluga exposed to metasistox showed significantly lower value (P<0/05) of erytherocyte (RBC) and leukocyte(Leuko) count, haemoglobin content (Hb), and haematocrit (PCV), MCV, MCH and relative lymphocyte and eosinophil count compared to the control group .In comparison of the relative heterophil count of the juvenils to control group, there was a significant increase in experimental group (P<0/05). But there were no statistically significant differences in MCHC value and relative monocite and basophile count between groups. Manuscript profile -
Open Access Article
4 - A study of benthoses and fishes composition and frequency in Canal adjusted to Gomishan Lagoon, Caspian Sea
Abstract This study was carried out during 2001-2002 period to determine the composition and frequency of macrobenthoses. Identification and diversity of fishes in different seasons in Gomishan Canal located in south-east of Caspian Sea were done. The analysis of MoreAbstract This study was carried out during 2001-2002 period to determine the composition and frequency of macrobenthoses. Identification and diversity of fishes in different seasons in Gomishan Canal located in south-east of Caspian Sea were done. The analysis of benthos samples showed three main groups of Mollusca, Annelidae and Arthropoda whit changed frequency in different months of the year. The order of the frequency from the highest to the lowest was as follow: Mollusca (Mean: 88.25%), Annelidae (Mean: 9.94%), and Arthropoda (Mean: 1.8%). Eight genus and seven families included in the sample were Carassius auratus, Gambusia holbrooki, Atherina boyeri, Neogobius spp, Liza sp. (L. auratus and L. saliens) Gasterosteus aculeatus, Clupeonella grimmi, Rutilus rutilus. The highest level of catching belonged to mullets. Manuscript profile -
Open Access Article
5 - Evaluation of quantitity and quality cultivation of fingerling Roach (Rutilus rutilus caspicus) in ponds
Abstract To evaluate the nurturing management of fingerling roach (Rutilus rutilus caspicus) in the BandarTurkman, Sijual region, eight ponds were randomly selected. Results of study on 2900 fingerling speciemens showed more than 76% of them had less than one gr. weigh MoreAbstract To evaluate the nurturing management of fingerling roach (Rutilus rutilus caspicus) in the BandarTurkman, Sijual region, eight ponds were randomly selected. Results of study on 2900 fingerling speciemens showed more than 76% of them had less than one gr. weight and a lenght of approximately 5 cm. The pattern of growth was allometric (base of condition factor and length-weight relationship) in most ponds. The most and the least similarity of average weight were among second and third groups, recpectively. The most and the least similarity of average lenght were seen in the groups of third and second ponds, respectively. Manuscript profile -
Open Access Article
6 - Evaluation of BHT antioxidant efficiency on stability diet lipid great sturgeon (Huso huso) in cold stored
Abstract The efficiency of BHT antioxidant was studied on the fat stability of Great sturgeon (Huso huso)diet comparison under three month's cold condition period. In this research, after preparing prim MoreAbstract The efficiency of BHT antioxidant was studied on the fat stability of Great sturgeon (Huso huso)diet comparison under three month's cold condition period. In this research, after preparing primary material and making compound diet pellet it used BHT antioxidant in the scale of 0.05% diet lipid. Some groups of diets were taken as witness chemical Indicators of lipid spoilage (Total lipid, free fatty acid, peroxide value) were investigated during monthly storage period for diets which contain antioxidant and witness. Results showed that total lipid of antioxidant diet in comparison with witness diet only occurs with statistically significant difference in the third month of storage. Quality factors of lipid spoilage (Peroxide value, free fatty acid) showed significant difference between witness diet and antioxidant diet except in the first month of storage. The results of this study indicated that although the lack of antioxidant decreases fat quality diet, the use of mentioned compound decreased the quality drop age of diet indicators during the storage period. Manuscript profile -
Open Access Article
7 - Suitability of formalin-containing fixative for the eggs of Cyprinus carpio and Rutilus frisii kutum
Abstract The suitability of 12 different formalin-containing fixatives consisted of: Gilson's and Bouin,s flouids, 0.5% to 10% buffered formalin, 0.1% to 1% unbuffered formalin with 0.7% sodium chloride (NaCl) and 0.1% to 1% unbuffered formalin with 0 MoreAbstract The suitability of 12 different formalin-containing fixatives consisted of: Gilson's and Bouin,s flouids, 0.5% to 10% buffered formalin, 0.1% to 1% unbuffered formalin with 0.7% sodium chloride (NaCl) and 0.1% to 1% unbuffered formalin with 0.9% NaCl 1% unbuffered formalin with 0.9% NaCl for the eggs of the Rutilus frisii kutum and Cyprinus carpio were tested.The size of the eggs diameter at several intervals (0, 0.5, 1, 2, 4, 24, 48, 72, 96, 120-hrs) after fixation were measured. The most suitable of the fixatives were for the wild common carp, 1% unbuffered formalin with 0.9% NaCl, for cultured common carp, 0.1% unbuffered formalin with 0.9% NaCl and 10% buffered formalin for R.frisii kutum, as their level of swelling or shrinkability were less than fresh eggs. Manuscript profile -
Open Access Article
8 - Leukocytes changes of infected Capoeta capoeta gracillis to Clinostomum complanatum in Shirood River
Abstract Clinostomum complanatum is a common parasite between human and fish (zoonose) .It can be locally found in different tissues of the fish. A large spectrum of freshwater bony fish; including Capoeta capoeta gracilis, harbour this parasite. It`s an en MoreAbstract Clinostomum complanatum is a common parasite between human and fish (zoonose) .It can be locally found in different tissues of the fish. A large spectrum of freshwater bony fish; including Capoeta capoeta gracilis, harbour this parasite. It`s an endemic fish in freshwater such as Shirood River in the western part of Mazandaran province. In this study, 120 fish were caught using cast net along Shirood River in two stations which is situated at the River entrance to the Caspian Sea and the second was in the upper part, during two seasons; winter and spring. The samples were tested, the reaction of immunity system in infected fishes to Clinostomum complanatum examined for changes of abundance perecentage of leukocytes. After biometrical measurments, samples were bleeded through cutting of peduncle and the infection to Clinostomum complanatum, in tissues and organs studied. White blood cells counts and differential cell count were done for infected and uninfected fish in the seasons and the stations.Statistical analysis of differential white blood cell count showed that in the first station, mean of lymphocyte, neutrophil and monocyte had significant difference between infected and uninfected fish (P<0.05). Mean of lymphocyte, neutrophil and eosinophil had significant difference between infected and uninfected fish in second station (P<0.05). The results showed that infection to the parasite exceeded in females in second station in Spring.The highest infection rate of Clinostomum complanatum metacercaria was observed in gills, under the opercolum, pharynx, muscles, under the skin, inside the muscle around fins, under the pupil of the eye, in the mouth and abdominal cavity. The metacercaria were observed inside the cysts in yellow, gray and black colors. Contamination intensity and mean of white blood cells, in females in second station in spring exceeded the first station and during the winter which may have caused by high water salinity in first station and decrease of first intermediate host snails and male lesser attendance during gonadal maturation. Manuscript profile
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