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Open Access Article
1 - Effects of replacement of dietary fish oil by vegetable oils on growth parameters, chemical composition and fatty acids profile of cultured juvenile Beluga (Huso huso)
Abstract[1] In this research, effects of replacement of different levels of vegetable oils instead of dietary fish oil on growth parameters, chemical composition and fatty acids profile of cultured Beluga juveniles (27.01±0.49 g) were studied for eight weeks. Fo MoreAbstract[1] In this research, effects of replacement of different levels of vegetable oils instead of dietary fish oil on growth parameters, chemical composition and fatty acids profile of cultured Beluga juveniles (27.01±0.49 g) were studied for eight weeks. For this mean, three isonitrogenous and isolipidic diets were formulated, containing 10% of added oil. Diets were consisting of 100% kilka fish oil in the first treatment (control diet), 50% fish oil and 50% mixed vegetable oils (soybean and canola oils, 1:1) in the second treatment and 100% mixed vegetable oils (soybean, canola and sunflower oils, 1:1:1) in the third treatment. There were no significant differences in the growth performance parameters and food consumption consisting of WG%, K, GR, SGR, Feed intake, FCR, PER and also chemical composition of carcass, consisting of raw protein, raw fat, moisture and ash among different treatments. By the inclusion of dietary vegetable oils, n-6 polyunsaturated fatty acids (n-6 PUFA), particularly linoleic acid (18:2n-6) significantly increased in beluga carcass, but docosahexaenoic acid (DHA, 22:6n-3), n-3 polyunsaturated fatty acids (n-3 PUFA), n-3 highly unsaturated fatty acids (n-3 HUFA) and the ratio n-3/n-6 in beluga carcass were significantly reduced. Generally, the fatty acids composition of fish carcasses was highly reflective of the dietary lipid sources. With consideration to lack of significant difference, the fishes of second treatment obtained a better growth performance than other treatments and these results suggest that cultured Beluga require n-3, n-6 and n-9 fatty acids in diets. *Corresponding author; mnikzad1984@yahoo.com Manuscript profile -
Open Access Article
2 - Presentation and appropriate model of cost for trout culture
Abstract[1] The existence of the cost information of cultured fish to use for management in decision making is essential. Supplying the necessary data is in need of establishing an accountings system of cost. The objective of this research is to present an appropriate MoreAbstract[1] The existence of the cost information of cultured fish to use for management in decision making is essential. Supplying the necessary data is in need of establishing an accountings system of cost. The objective of this research is to present an appropriate model of cost for culturing trout, and in this way, the necessary data related to fish culturing will be provided. Data collection is based on case study and library methodology and based on the study and investigation of the process of culturing trout, and according to the theoretical accounting, the model for the cost of the product will be given. In order to accept the offered model and the findings Delphi-Test was employed and the results were judges by experts and specialists in this realm To gather their suggestions and ideas, an appropriate form was used and its completion will be continued till all have the same agreement on it. Finally the appropriate model of cost information for culturing trout has been provided. *Corresponding author; ahmad_mahdavi2001@yahoo.com Manuscript profile -
Open Access Article
3 - Survey and assessment of predation of fish beach seine cooperative companies in Golestan province in 2005-2006
Abstract[1] Total predation of 19 fish beach sein cooprative companies was evaluated in Golestan Province (Miankale, Khaje-Nafas and Gomishan Zones) by using of question forms and arrangement of special forms with them managements. Results were showed that predation rat MoreAbstract[1] Total predation of 19 fish beach sein cooprative companies was evaluated in Golestan Province (Miankale, Khaje-Nafas and Gomishan Zones) by using of question forms and arrangement of special forms with them managements. Results were showed that predation ration of Rotilus frisii kutum was significantly more than two zones (Khaje-Nafas and Gomishan), as the ration of it strongly decreased from Miankale zone to Gomishan Zone. Inversely, predation ration of Cyprinus carpio was significantly more than two other zones and it strongly increased from Miankale Zone to Gomishan Zone. The ration of Mugilidae (Liza auratus and L.salince) was more less two zones. This different can be related to floor and it,s organisms. Regression model F test was significant. Also, T test parameters determined significant effect of Zones on the ration of the predation. Predation ration average in Khaje-Nafas and Gomishan Zones were 91466.9 and 50922.7 kg lower than Miankale Zone. *Corresponding author; ghorbaninasrabadi@yahoo.com Manuscript profile -
Open Access Article
4 - Comparison Reproductive and Biometric Indices in Russian sturgeon Acipenser gueldenstaedti in Iran and Russia
Abstract[1] Understanding biometric and reproductive indices in sturgeon broodstocks can improve and help to artificial propagation quality. This study was conducted to aim of determination of biometric and reproductive indices in Russian sturgeon (Acipenser gueldensta MoreAbstract[1] Understanding biometric and reproductive indices in sturgeon broodstocks can improve and help to artificial propagation quality. This study was conducted to aim of determination of biometric and reproductive indices in Russian sturgeon (Acipenser gueldenstaedti) in Iran climate condition and was compared to broodstock condition in sturgeon hatcheries in Russia. 27 female and 13 male broodstocks were considered in Shahid Marjani hatchery centre. After maintaining the broodstocks at Kuranski ponds and measuring the germinal vesicle position, 12 female was eliminated from artificial propagation and the others was injected by pituitary hormone. After maturity duration, 10 females and 5 males showed positive response to the hormone injection. For comparing the obtained results to sturgeon artificial propagation and rearing activities, the data was compared to hatcheries normatives in Russia. Results showed that some of parameters including weight, age, fecundity and percent of egg donating broodstocks in Iran are less than to Russian hatcheries, it seems that the broodstocks are not in high maturating level and they are before maturity stage, but oocyte size and ovary weight were at the same mean size and weight in Volga broodstocks. Therefore, it seems that there is no suitable conditions to Russian sturgeon migrating in south of the Caspian Sea, so there are not suitable broodstocks according to physiological and reproductive parameters in hatcheries, and after propagating this kind of broodstocks, there will be some problems in artificial propagation like low inducing the broodstocks, percent of fertility, survival at incubation period and so on. *Corresponding author; falahatkar@guilan.ac.ir Manuscript profile -
Open Access Article
5 - Effect of dietary immunogen prebiotic on growth and survival indices of giant sturgeon (Huso huso Linne, 1758) juveniles
Abstract[1] The use of prebiotics, nondigestible dietary ingredients that beneficially affect the host by selectively stimulating the growth and /or activating the metabolism of health- promoting bacteria in the intestinal tract, is a novel concept in aquaculture. This MoreAbstract[1] The use of prebiotics, nondigestible dietary ingredients that beneficially affect the host by selectively stimulating the growth and /or activating the metabolism of health- promoting bacteria in the intestinal tract, is a novel concept in aquaculture. This survey was conducted for evalution the efficiency of commercial prebiotic immunogen in five treatments (0, 0.5%, 1%, 2%, 4%) in ration of giant sturgeon (Huso huso) juveniles in 3 weight range of small fishes with average weight 8.71±0.02 gr, medium fishes with average weight 25.15±0.01 gr and large fishes with average weight 53.69±0.02 gr. fishes were fed up six meals a day. The trial at period 8-week was conducted in Shahid Marjani Sturgeon hatchery of breeding and culture in summer 2009. At the end of culture period, growth performance and survival rate forgiant sturgeon juveniles compared. The results showed that difference in average of weight, length, daily growth, body weight increase percent, specific growth rate percent and condition factor of fishes fed by diets containing 0.5% and 1% immunogen significantly (P<0.05) higher than control group. Difference food conversion rate in fishes fed the diets supplemented with 0.5% and 1% prebiotic immunogen significantly (P<0.05) lower than control group. Survival rate in fishes fed contained 0.5% prebiotic immunogen was higher than fishes fed by basal diet but there was not statistically significant (P>0.05). Based on these data, it is concluded that immunogen prebiotic in lower level can serve as functional feedstuffs in the diet of giant sturgeon juveniles by enhancing growth performance and survival. *Corresponding author; mohajer_m@hotmail.com Manuscript profile -
Open Access Article
6 - The effects of zeolite on growth parameters of common carp of Caspian Sea
Abstract The use of zeolite was investigated to improve the environmental condition of common carp. The fingerlings of 13 grams were tested in 4 treatments. Each treatment contained 60 fish and 3 replications, in RBD experiment design. The treatment was performed 20, 4 MoreAbstract The use of zeolite was investigated to improve the environmental condition of common carp. The fingerlings of 13 grams were tested in 4 treatments. Each treatment contained 60 fish and 3 replications, in RBD experiment design. The treatment was performed 20, 40, 80 and 120 mg/l and one without zeolite as control. EC, T, O2 and salinity was equal but the amount of No2, NO3, NH4 and total hardness, was lower in zeolite treatment compared to the control group. Other parameters such as TDS, pH and sulfide were not different. The results showed that using zeolite can improve the water condition but the SGR, PER, FCR and total weight, in spite of pronounced difference between the dosage of 8 and 120 mg/l, the difference was not significant. In treatment of 80 mg/l, weight increased for 31%, GR for 29%, SGR for 29%, PER for 42%, more than the control group. FCR in the control group was 3.07 while in treatment with 80 mg/l zeolite, it was 2.34.The present study showed by using zeolite and by good management to improve the water condition, it is possible to improve the growth parameters of fish. Manuscript profile -
Open Access Article
7 - Effect of age on reproductive performance in male Kutum broods (Rutilus frisii kutum, Kamenskii 1901) in Tajan River
Abstract Kutum (Rutilus frisii kutum) is one of the economically important fish in the Caspian Sea. To reproduce, these fish migrate from the Caspian Sea to various rivers every year. One of these rivers, which the fish migrate to, is Tajan River. For this reason, mill MoreAbstract Kutum (Rutilus frisii kutum) is one of the economically important fish in the Caspian Sea. To reproduce, these fish migrate from the Caspian Sea to various rivers every year. One of these rivers, which the fish migrate to, is Tajan River. For this reason, millions of newly born kutum, larva cultivated through artificial propagation, are released in the rivers entering the Caspian Sea every year. From among those, male broods have a significant role in the propagation process. For this reason, it seemed necessary to investigate the effect of age on the reproductive performance of male broods in artificial propagation efficiency in Kutum in 2008. For the present study, 3 groups of male broods (3, 4 and 5 years old) were fertilized with female’s broods individually. The results showed that, maximum average spermatocrit percentage (53.67±18.03%) belonged to 3- year- old male broods and maximum average concentration of mail (31.38±12.16×109) belonged to 4-year-old male broods. The results obtained indicated significant differences (P£0.05) in mean fertilization rate and hatching rate. The present study showed that the produced eggs from fertilization of 4- year-old male's milt and female's ova had maximum average of rate in fertilization percentage (95%) and hatching percentage (98.43%). Based on the results of the present study, 4- year-old male broods are the best choice in artificial propagation. Manuscript profile -
Open Access Article
8 - Effects of various concentrations and times of salt bath on skin wound healing process in carp, Cyprinus carpio
Abstract This study investigated healing of experimentally wounded carp (length of wound:1cm, depth of wound: 0.5cm) with various concentrations and times of salt bath under laboratory conditions at temperature of 13-18ºC. This was in to improve the healing proces MoreAbstract This study investigated healing of experimentally wounded carp (length of wound:1cm, depth of wound: 0.5cm) with various concentrations and times of salt bath under laboratory conditions at temperature of 13-18ºC. This was in to improve the healing process in skin lesions. Fifteen treatment groups of fish (body weight 5.2±2.03g) were bathed with various concentrations: 1%, 2% and 3% and various times: 1, 2, 3, 4 and 5 and one group without any bath as control. After wounding, all of the wounded carp were put in salt bath and all treatment were divided to 3 groups. First group put in 1%, Second group put in 2% and group 3 put in 3% concentration of salt bath, any of these in divided to 5 groups and difference of these was in times of salt bath. Wounded tissues were sampled in 3, 7, 10, 14, 17, 21, and 30 days after making the incision. During the 28 day period of wound healing there were statistically significant changes in among treatments with 1%, 2% and 3% concentration of salt. Histological analysis revealed that incision in treatments with 2% and 3% concentration of salt healed better. Therefore, salt bath with 2% and 3% concentration improve wound healing in carp under the conditions of this study. Manuscript profile
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