2024-03-28T15:25:40+03:30 http://isfj.ir/browse.php?mag_id=51&slc_lang=fa&sid=1
51-2048 2024-03-28 10.1002
ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 The measurement and total factors productivity analysis of cold-water fish production in Kermanshah province farms A. Najafi affs341n@gmail.com S.Y. Zeraatkish Z. Mataei mojtaba_almasi@yahoo.com K. Gharra In order to do an economic study and measure the productivity of the factors of production of the coldwater fish in Kermanshah province, all of the active farms of this province in 2015 agricultural year have been chosen as the statistical population. A part of the required data for this study is taken from the published official statics, and another part is collected through interviews via questionnaires with fish farmers and the experts of the fishery department of Kermanshah. Then using Eviews software and with the ordinary least square (OLS) method, the production functions have been estimated; and through the priority model test, Cobb-Douglas production function was finally chosen. Results show that the variables of the geographic location, education, the number of the released juvenile fish, the number of juvenile fish losses and using the aeration devices have a significant effect on the amount of the production (p<0.05). The sum of the coefficients of independent variables in the estimated production function is around 0.08, which indicates decreasing (downward) returns to scale. The production elasticity of aeration devices and water-returning pumps is more than the other inputs, suggesting that this input should be used more appropriately for this economic activity. Also the coefficient of the number of juvenile fish is 0.69, which indicates that if the number of juvenile fish is increased one percent, the production of fish will increase by 0.69 percent; and the demand for more released fish shows the direction toward the optimal production.In this study, results have indicated that the experience of the farm manager has no significant impact on the production (p>0.05), but education has a significant and positive effect (p<0.05). Expressing that technological level in this activity is high. Since this industry is a new activity in this non-coastal province, Kermanshah, so it seems logical that the educational level of employers would have a significant effect on the production.The comparision of the production function and the lnTFP functions indicates that some of the factors of production, which had a significant effect on the production function, have no significant effect on the productivity, and vice versa. Hence, this leads us to the point that to achieve a greater profitability and an optimal utilization of the factors of production, the estimation of the production function is necessary, but not sufficient; rather for a more accurate assessment of using the factors of production, in addition to estimating the production function, calculating the productivity indexes and estimating TFP function is demanded, so that a more complete study is provided.   Productivity Kermanshah Aquaculture Cold water Production 2018 10 01 1 11 http://isfj.ir/article-1-2048-en.pdf 10.22092/ISFJ.2018.117454
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Changes of sea cucumber (Holothruia leucospilota) proximate composition during geographical- seasonal variation in the Persian Gulf and Oman sea waters M. Hafezieh jhafezieh@yahoo.com Sh. Jamili shahlajamili45@yahoo.com Sh. Dadgar shdadgar@yahoo.com In this study, proximate composition of Holothuria leucospilota from Sistan and Baluchistan, Hormozgan to some parts of Bushehr provinces which were caught by diving, during autumn and winter 2016 and spring and summer 2017, determined. For this purpose, one station was selected in each province, three specimens from each three replication of different seasons sampled. In nutrition laboratory, all specimens from replication of each season of separated province, minced and analyzed proximate compositions protein, lipid, ash and humidity based on standard methods. Results showed that the studied sea cucumber species compromised relative high protein level (p<0.05). The highest protein content was found in Hormozgan at summer season (15±3.69) and lowest not significantly in Bushehr at autumn season (10±1.73) and Sistan and Baluchistan province at spring season (10±1.8), caused by higher WT. and consequently higer chlorophyll a contents in Hormozgan water at summer season compare to samples from other studies provinces at the same seasons. Humidity percentage were the highest in the sea cucumber caught at winter both in Bushehr (86.1±8.43) and Sistan–Baluchistan (86.1±7.43) provinces not significantly (p>0.05), while the lowest (p<0.05) was obtained from Hormozgan samples at spring season (81.1±5.63).  Lipid contents with low levels in this species showed the highest in Sistan and Baluchistan province at winter season (0.29±0.08) and the lowest lipid content was obtained from sampled in Hormozgan province at Summer time (0.12±0.02) (p<0.05). Ash body content of H. leucospilota species was the highest in samples from Bushehr province at winter season (3.0±0.24) and the lowest ash was found in specimens from Hormozgan province at winter season (2.08±0.24) (p<0.05). Sea cucumber Proximate composition Different seasons Oman Sea Persian Gulf 2018 10 01 13 24 http://isfj.ir/article-1-2025-en.pdf 10.22092/ISFJ.2018.117453
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 The gastrointestinal histological changes in zebra fish (Danio rerio) fed with cumin (Cuminum cyminum) essential oils M. Shahriari Moghadam mohsen.mshahriari@gmail.com E. Ahmadifar ehsan.ahmadifar@gmail.com Present study was conducted to investigate the effects of cumin (Cuminum cyminum) essential oil on the intestine and liver tissues of zebra fish. Essential oil was added to the diet in two concentrations (500 and 1000 mg/kg) and at the end of the experiment (8 weeks) histological studies were performed. The results showed that villus height and width, absorption surface area of the intestinal mucous membrane surface, diameters of hepatocyte and their nucleus in the fish that fed with the essential oils were higher than control treatment, while the crypt depth decreased compared with the control. In fish grown with diet containing 1000 mg/kg, the number of goblet cells increased compared with control group, while in fish fed with the lower concentrations, the number of them was lower. Despite the observed changes in the measured parameters just the diameters of the hepatocytes in fish fed with diets containing 1000 mg/kg essential oils showed a significant difference and the size of these cells was larger than other treatments. In general, due to the increase in the absorption surface area and decrease in the number of goblet cells in fish fed with diet containing 500 mg/kg essential oil it seems that the use of low concentrations of essential oils can improve the histological characteristics of the digestive tract.   Cumin Goblet Cell Hepatocyte Intestine Zebra Fish 2018 10 01 25 35 http://isfj.ir/article-1-2050-en.pdf 10.22092/ISFJ.2018.117979
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Analysis of some metal elements (Al, V, Ni, Zn, Tl, and SN) and their relationship with gender and biometric indices in different tissues of the golden grey mullet (Liza aurata) M. Behruz mohammad_behrooz@ymail.com M. Norouzi nmehrnoosh@yahoo.com The present research was conducted to evaluate the concentration of some metal elements in aquatic animals, which is important for human health. The aims of this study were to examine the concentration of metal elements namely zinc (Zn), nickel (Ni), tin (Sn), aluminum (Al), vanadium (V), and thallium (Tl), and their relationship with gender and biometric indices on edible (muscles) and nonedible (liver and gill) tissues of the golden grey mullet (Liza aurata). Samples were obtained from mature golden grey mullet in different regions on the shoreline of the Caspian Sea in autumns and springs of 2014 and 2015. According to standard methods, metals were extracted of muscles, livers, and gills of the species using the digestion method and an acid mix. The concentration was determined using a graphite atomic absorption spectrometer with µg/g dry weight. Research results revealed that absorption of metal elements was higher in spring than autumn and it was in the Zn>Ni>Sn>Al>Tl>V order in the muscle tissues and the Zn>Ni>Al>Sn>V>Tl order in the liver and gill tissues. The order of concentration of metals in the three aforementioned tissues was as follows: liver>gill>muscle. Concentrations of aluminum, vanadium, zinc, nickel, tin, and thallium in the muscle tissues were 0.09, 0.04, 19.33, 0.09, 04.43, and 0.04 µg/g dry weight, in the liver tissues were 0.2, 0.13, 75.44, 0.82, 0.15, and 0.1 µg/g dry weight, and in the gill tissues were 0.14, 0.07, 51.47, 0.6, 0.09, and 0.07 µg/g dry weight, respectively. The highest concentration of metals was observed in the male species. Weight and length showed a significantly negative relationship with accumulation of aluminum, vanadium, and zinc in the three tissues (p<0.05). The comparison of concentrations of metal elements in muscle tissues to the standard WHO (1996) concentration showed that concentrations of all of the metals under study were lower than the standard levels. Metal Elements Golden Grey Mullet Tissues Iran Coasts Caspian Sea 2018 10 01 37 46 http://isfj.ir/article-1-1725-en.pdf 10.22092/ISFJ.2018.117684
51-1971 2024-03-28 10.1002
ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Enzymatic assisted extraction of gelatin from Beloga (Huso huso) fish skin in response surface method (RSM) Z. Eskandari shadieskandari0704@gmail.com A. Jafarpour a.jafarpour@sanru.ac.ir A. Motamedzadegan Fish gelatin, by benefiting the lower melting point, quicker mouth melting and presenting elastic characteristics is considered as the most proper substitute for mammalians gelatin and as a Halal food item. The aim of this study was to evaluate the effects of temperature at three levels of 30, 40 and 50 ºC, enzyme at 0.055%, 0.01% and 0.1% (w/w) levels and pH at 2, 3 and 4 levels on the quality of extracted gelatin from Huso huso fish skin. Accordingly, the gel strength in form of breaking force and distance, yield and color (L*a*b*) and whiteness of resultant gelatin were determined. According to the results, the highest gelatin yields as 21.65% was related to the enzymatic assisted method at 50 ºC, 0.01% enzyme at pH=2, whereas it was obtained as 10% at the chemical extraction method. Based on the results, despite from temperature, by increasing of pH and enzyme percentage, the firmness of gelatin was increased (p<0.05). The highest firmness was recorded at 30 ºC, 0.1% enzyme at pH=4. The color data revealed that lightness (L*), redness (a*) and whiteness of enzymatic extracted gelatin powder was higher that the chemical extracted one (p<0.05). The highest lightness was observed at 40 ºC, 0.055% enzyme at pH=3. In conclusion, by application of 30 ºC and 0.1% enzyme at pH=4 the highest gelatin with the highest firmness is achievable, while using 50 ºC and 0.01% enzyme at pH=2 could results the gelatin yield. Firmness Enzymatic Extraction Yield Color Gelatin Huso huso 2018 10 01 47 56 http://isfj.ir/article-1-1971-en.pdf 10.22092/ISFJ.2018.117817
51-1342 2024-03-28 10.1002
ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Introducing Coral carrier and comparing it with Carrier basket D. Ajdari danielajdari@yahoo.com   Corals belong to Anthozoa and Cnidaria class, consisting of densely populated polyps, each of them individually lives with algae called Zugansentla. Coral reefs are one of the most important and effective factors in marine ecosystems. For this reason, conservation and restoration of this aquatic environment, especially in sustainable development programs, is mentioned. In 2011, a group of coral reef located Shahid Beheshti pier in Chabahar was transferred to safe area under investment of the ports and seaside organization. This corals were endangered due to e development of Shahid Beheshti pier project. Since the corals are subtle, sensitive, fragile and vulnerable, their displacement should be done with maximum caution in order to minimize the chances of breaking and mortality. Coral Carrier was a vehicle which forty-five days used to move coral in the development project of Shahid Beheshti pier. Qua in this period, 18,000 corals were transferred to a proper location. The study showed that 34 and 76% corals safely relocated by coral basket and coral carriers respectively. The results of one year monitoring significantly showed  26 and 92% survival of corals performed with coral basket and coral carriers respectively at the level of P<0.05. Due to the efficiency of the coral carrier's innovative device and its reliance on coral transfer, this device can be a good alternative to the coral basket system. Corals Coral relocation Coral Basket Coral Carrier Oman Sea. 2018 10 01 57 66 http://isfj.ir/article-1-1342-en.pdf 10.22092/ISFJ.2018.117724
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea R. Tatar sgorgin@gmail.com R. Ghorbani rasulghorbani@gmail.com S. Gorgin sgorgin@gau.ac.ir Gh. Bandani gorgin_s@yahoo.com M. Yahyaei mohsenyahyaee@yahoo.com Caspian roach (Rutilus caspius), is one of the most important commercial species in the Caspian Sea with a high level of catch fluctuations over the past decades mainly due to overfishing. In this study, data from 246 specimens caught from beach seine cooperative companies in the southeast coast of the Caspian Sea during the October 2014- April 2015 were analyzed. Results showed that the fish age were ranged between 3 to 10 years with fork lengths and weights ranging 14.5-32.1 cm and 70.7-437 g, respectively. The growth parameters of the von Bertalanffy equation were found as Lt=41.8 [1-e–0.12(t+0.766)]. The length-weight relationships were estimated to be WT= 0.0208 FL2.9184 (R2 =0.901) for females and WT= 0.0138 FL3.0244 (R2 =0.921) for males. Weight increased isometrical with the fork length for females and males. Total mortality, natural and fishing coefficients (Z, M, F) and exploitation rate (E) were estimated to be 1.239, 0.324, 0.916 year-1 and 0.74, respectively. Fish biomass and maximum sustainable yield (MSY) were equal to 417 Kg and 215 Kg, while the ration of cooperative companies catch was 28 Kg. Therefore, it is suggested that the Caspian roach stocks are severely exposed to overfishing, and there is an urgent need to efficient management for stock conversation. Growth parameters Southeast of the Caspian Sea Biomass Rutilus caspius 2018 10 01 67 76 http://isfj.ir/article-1-2017-en.pdf 10.22092/ISFJ.2018.117721
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Effects of replacing dietary fish oil with canola oil on growth indices, survival rate and body chemical composition of rainbow trout (Oncorhynchus mykiss) fingerling S. Barzegar sbarzegar.1985@gmail.com K. Aliramaji kiomarsramaji.2017@gmail.com S. Najjar Lashgari se_lashgari@yahoo.com M. Adel miladadel85@yahoo.com M. Mohammad Alikhani m.mohammadalikhani1982@gmail.com This study was conducted to evaluate the effects of replacing dietary fish oil with canola oil on growth indices, survival rate and body chemical composition of rainbow trout (Oncorhynchus mykiss) fingerling. For this purpose, three experimental diets were prepared with the same protein level (40%) and fat levels of 100% )First diet with 10% fish oil, second diet with 100% canola oil and third diet with 50% fish oil and 50% canola oil with three replicates). Then 405 fingerling rainbow trout with an average weight of 11±1 g and a density of 45 in 9 ponds were fed in experimental diets for 8 weeks. Based on the results, the combination of 5% fish oil and 5% canola oil in the ration improved the growth indices including: final weight, Increase Body Weight (BWI), Special Growth Ratio (SGR) and Condition Factor (CF) and showed a significant difference with other treatments and the highest amount was observed in 10% fish oil treatment (p<0.05). However, there was no significant difference between treatments in terms of survival rate and protein, fat, ash and moisture content of fish carcasses (p>0.05). Based on the results of this study, replacing part of canola oil with fish oil (50% fish oil with 50% canola oil) in rainbow trout diet has a positive effect on growth indices and can reduce costs by reducing the length of breeding period.   Canola oil Growth Survival Carcass analysis Rainbow trout 2018 10 01 77 85 http://isfj.ir/article-1-1830-en.pdf 10.22092/ISFJ.2018.117722
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 The study on Zoonotic bacteria in Gold fish (Carassius auratus auratus) of Guilan province farms M. Faeed m_faeed@yahoo.com S. Omidvar sadeghomidvar362@yahoo.com M. Ghasemi mohades@yahoo.com M. Mehrabi drmehrabi@gmail.com F. Mirhasheminasab mirhashemi_v@yahoo.com J. Daghigh Rouhi javad_daghigh@yahoo.com Goldfish rearing is common in most countries of the world. In this study, 150 specimens of Goldfish were taken from four fish farms (12 pools) seasonally and selectively, and transferred alive in the bacteriological laboratory of Inland Waters Aquaculture Research Center. The bacteria were isolated from professional test and biochemical methods. The results showed that Goldfish and pool water bacteria isolations were included Enterobacteriaceae, Pseudomonas sp., Aeromonas sp., Sterptococcus sp., Vibrio sp., Mycobacterium sp. In different seasons of the year, the highest and lowest abundance of bacteria in Goldfish, respectively, belonged to the genus Pseudomonas spp. (33/6%) and Streptococcus spp. (7/3%). Iran Guilan Bacteria Goldfish Zoonosis 2018 10 01 87 96 http://isfj.ir/article-1-1889-en.pdf 10.22092/ISFJ.2018.117723
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Assessment of bio communities, water quality and aquaculture potential of Ardalan dam reservoir in East Azarbaijan province J. Daghigh Roohi javad_daghigh@yahoo.com A. Mirzajani armirzajani@gmail.com A. Abedini abediniali47@gmail.com M. Samadzade mm.samadzadeh@gmail.com J. Sabkara jsabkara@yahoo.com K. Abbasi keyvan_abbasi@yahoo.com S. Khatib sepidehkhatib@yahoo.com In this study the biotic and abiotic characteristics of Ardalan dam reservoir was studied from 2011 to 2012. Diatoms, Bacillariophyta, was the main phylum of phytoplankton in Ardalan dam reservoir that was dominant in the most seasons and green algae, Chlorophyta, was the second dominance groups. Survey of zooplanktons showed there were 25 genus from 6 phylum, and Rotatoria constitute 64% of the zooplanktons in. The average phytoplankton and zooplankton abundance during this study were about 19.15×106 and 1863 per liter of lake water respectively. Survey of benthic communities showed that Chironomidae and Tubificidae were the main benthic groups in Ardalan dam. Average of benthic biomass during this survey was 0.9 gr/m2 which is very poor. Sediments in Ardalan dam was mostly of silt and clay. Fish structure survey by gill nets in Ardalan dam showed that common carp and silver carp, by %53 and %45 respectively were the main economical species in the dam. Hydro chemical survey showed that total phosphorus and total nitrogen were 0.073 and 0.779 mg/L respectively. The amount of chlorophyll a was 6.03 mg/m3. The range `of dissolved oxygen was 6.4-10.5 mg/L. Average of EC was 576 µs/cm. Since the water temperature just in august month was more than 20ºC, the appropriate period for warm water fish culture in this reservoir is limited. Ardalan dam Aquaculture Eastern Azarbaijan 2018 10 01 97 105 http://isfj.ir/article-1-1896-en.pdf 10.22092/ISFJ.2018.117732
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Comparative study of the effect of anesthetizer Topped lavender essential oil (Lavandula angustifolia) with clove oil (Eugenia caryophyllata) on some hematological and serum biochemical parameters of common carp (Cyprinus carpio) juveniles N. Beheshti nargesbeheshti69@gmail.com S. Yeganeh skyeganeh@gmail.com M. Adel miladadel85@yahoo.com This study was conducted to compare the effect of two anesthetizers Topped lavender essential oil (Lavandula angustifolia) and clove oil on some hematological and serum biochemical parameters in common carp (Cyprinus carpio) juveniles. Common carp juveniles exposed to three treatments including optimum concentration of Topped lavender essential oil (170 mg l-1), clove oil (35 mg l-1) and control and hematological, serum biochemical and stress parameters were determined at different times including 0, 3 and 24 h after anesthetizing. The results showed the effect of treatment (anesthetizing agent) on all hematological parameters, the effect of time on WBC, Hb, MCH and MCHC, the interaction effect of treatment and time on Hct and RBC and the effect of treatment, time and the interaction effect of them on all serum biochemical parameters were significant (p<0.05). Over the studied period after anesthetizing, RBC didn’t show significant difference between Topped lavender and control (p>0.05), but in clove oil at the start of anesthetizing time (0) was significantly higher than other sampling times (p<0.05). WBC showed significant decrease compare to other treatments in all sampling times (p<0.05). Over the studied period after anesthetizing, Hb decreased in the control group and increased in Topped lavender and clove oil treatments (p<0.05), Hct also showed significant increase in the control group (p<0.05) and didn’t significant difference in other treatments (p>0.05). In all times, the lowest amount of glucose was observed in Topped lavender treatment; in Topped lavender and clove oil treatment, after increase in 3 h after anesthetizing, showed decrease in 24 h (p<0.05). The amount of Cortisol didn’t have significant difference between the control and Clove oil groups (p>0.05). In all the studied times, higher level of AST in the control, ALT in the control and clove oil, ALP in clove oil and the lower LDH in Topped lavender groups were observed (p<0.05). Overall, although the effect of Topped lavender essential oil on determined parameters showed some difference with clove oil, but Topped lavender essential oil can introduce as native anesthetizing replacement agent for aquaculture. Cyprinus carpio Clove oil and Topped Lavender essential oil Anaesthetic Hematological and serum biochemical parameters 2018 10 01 107 121 http://isfj.ir/article-1-2022-en.pdf 10.22092/ISFJ.2018.117733
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Comparative changes in peeled white shrimp (Metapenaeus affinis) during ice and refrigerator storage S. Salehi sorayasalehi@yahoo.com A. Khodanazary khodanazary@yahoo.com E. Zamani eshaghzamani@yahoo.com To improve shrimp quality, it is of importance to evaluate shrimp spoilage characteristics. Therefore, physicochemical, microbiological and sensory changes of white shrimp (Metapenaeus affinis) during storage at ice (0ºC) and refrigerator (4±1ºC) were assessed. Mesophilic, psychrophilic, Entrobacteriaceae, Staphylococcus sp., H2S producing bacteria (white colony) and H2S producing bacteria (black colony) counts of stored in ice at day 16 were 7.50, 7.83, 7.13, 6.42, 7.06 and 6.45 log10 CFU/g, respectively. Mesophilic, psychrophilic, Entrobacteriaceae, Staphylococcus sp., H2S producing bacteria (white colony) and H2S producing bacteria (black colony) counts of stored at refrigerator at day 16 were 8.76, 9.80, 8.13, 6.95, 8.28 and 7.20 log10 CFU/g, respectively. Mesophilic, psychrophilic, Entrobacteriaceae, Staphylococcus and H2S producing counts were higher in white shrimp stored at refrigerator compared to white shrimp that stored at ice. Thiobarbituric acid, free fatty acid, total volatile bases nitrogen and pH indexes were higher in white shrimp stored at refrigerator compared to white shrimp stored at ice (p<0.05). The lowered rate of increase in pH, total volatile basis nitrogen (TVBN) were obtained in shrimp stored at ice. H2S-producing bacteria were the dominant group of microorganisms at refrigerator whereas Enterobacteriaceae were dominant at ice. Total volatile basic nitrogen correlated well (r= 0.859) with the sensory scores in shrimps stored at ice and correlated well (r= 0.987) with the sensory scores in shrimps stored at refrigerator. Correlation coefficient of bacteria count and sensory evaluation in shrimp stored at ice and refrigerator was above 0.824. The results showed that using of ice could improve the microbiological count and delay the spoilage and extend the shelf life of white shrimp (M. affinis). Metapenaeus affinis Sensory evaluation Microbial count Physicochemical properties. 2018 10 01 123 136 http://isfj.ir/article-1-1978-en.pdf 10.22092/ISFJ.2018.117746
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 The effects of low protein and fishmeal diets on growth parameters and Nitrogen excretion in rainbow trout (Oncorhynchus mykiss) A.A. Esmaeili ali_esmaeeli@yahoo.com A. Keramat amirkola@yahoo.com A. Teymori astymori@yahoo.com H. Oraji h_ouraji@sanru.ac.ir The main goal of the current study was to investigate the effects of low protein diets along with fishmeal replacement by plant protein in rainbow trout diet. In the current study, three protein levels (32, 36 and 40%) and three fishmeal levels (20, 40 and 60%) were tested in rainbow trout. Amino acid content of the diets were balanced by addition of essential amino acids. This led to nine experimental diets and three replicates for each treatment. The results showed that growth parameters were influenced by protein level (p<0.05). However, fishmeal replacement only changed final weight and specific growth weight (p<0.05). The result also revealed that the interaction effect between protein level and fishmeal replacement was significant only for specific growth rate (p<0.05) and there were no interaction effect for other growth parameters (p>0.05). Maximum growth was observed in fish fed diet containing 36% protein and 40% fishmeal. Both protein level and fishmeal replacement affected TAN excretion in rainbow trout (p<0.05) and minimum ammonia nitrogen was observed in treatments 36p20f and 32p40f (p<0.05). In conclusion, the current result suggested that lowering dietary protein by 36% and also fishmeal replacement by plant protein up to 60% did not have a negative impact on growth parameters in rainbow trout when dietary essential amino acids were balanced. This condition also can lead to a lower ammonia release to water. Amino Acids Growth Feed Conversion Protein Level Fishmeal 2018 10 01 137 148 http://isfj.ir/article-1-2052-en.pdf 10.22092/ISFJ.2018.117747
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Changing olfactory preference by olfactory imprinting in Persian Sturgeon (Acipenser persicus) larvae M. Shakouri mehdishakouri@gmail.com H. Oraji hoseinoraji@yahoo.com A. Karamat Amirkolahi amirkola@yahoo.com H. Abdolhay hossein_abdolhay@yahoo.com Olfactory imprinting is one of the affordable approaches for improving neonatal feeding in husbandry. In order to evaluate the possibility of olfactory imprinting in the Persian sturgeon larvae and to evaluate its future application in the feeding of larvae, two groups of early fertilized eggs were exposed to the stimuli solution (phenyl ethyl alcohol (0.0001 mol/L) and the fish feed extract (0.01 g/L) until 29 days after hatching. The third group (control) exposed to neither stimuli solution nor the fish feed extract. Fish larvae behavior was examined in Y-maze at days 11 and 25 posthatch in order to evaluate the larvae preference/avoidance reactions to the stimuli solution and the fish feed extract. The results indicated that the exposed Persian sturgeon larvae did not show any preference/avoidance reaction at day 11 posthatch to the pertinent stimuli, whereas the exposed Persian sturgeon larvae preference was for the stimuli solution rather than the fish feed extract at day 25 posthatch (P<0.05). The preference of larvae of the control group was for the fish feed extract rather than the stimuli solution at day 25 posthatch, whereas the exposed Persian sturgeon larvae preference was for the stimuli solution rather than the fish feed extract at day 25 posthatch. The average time of the larvae presence (value for reaction) in the arm containing the pertinent stimuli was significantly higher than the average time of the larvae presence in the arm containing the fish feed extract (P<0.05). The result indicated that continues exposure of egg and larvae of the Persian sturgeon to the phenyl ethyl alcohol (0.0001 mol/L) and the fish feed extract (0.01 g/L) could change olfactory preference of the larvae at day 25 post hatch. Olfactory imprintin Persian Sturgeon feeding Y-maze Reaction value 2018 10 01 149 158 http://isfj.ir/article-1-1921-en.pdf 10.22092/ISFJ.2018.117751
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Identification of parasites of Aphanius vladykovi from Shalamzar and Salm Lakes, Chaharmahal va Bakhtiari Province, Iran M. Raissy mreissy@yahoo.com E. Pirali esmaeil_pirali@yahoo.com P. Mohseni mohseni123@yahoo.com Zagros tooth-carp (Aphanius vladykovi) which belongs to cyprinodontidae family is one of the most important native fish species of Iran. In this study which was conducted in summer 2015, a total of 50 individuals of A. vladykovi were caught from Shalamzar and Salm Lakes in Chaharmahal va Bakhtiari Province and were examined for parasites. The results of this study indicated that all the examined fish were infested by parasites. Different parasite species including Ichthyophthirius multifiliis, Ichthyobodo necator, Gyrodactylus sp., Allocreadium isoporum and metacercaria of Ornithodiplostomum sp. were found in the examined fish. Among them, the highest infestation rate belonged to Ornithodiplostomum sp. as 68 percent of the studied fish were infested by this parasite. The infestation rate of Ornithodiplostomum sp.in fishes from Shalamzar and Salm Lakes were 41.66 and 92.3 percent, respectively. The results of this study indicated that Zagros tooth-carp fish is highly infested with different parasite species affecting population of this fish. Zagros tooth-carp Aphanius vladykovi Fish parasites Ornithodiplostomum sp. 2018 10 01 159 163 http://isfj.ir/article-1-2028-en.pdf 10.22092/ISFJ.2018.117720
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ISFJ isfj 1026-1354 2322-5998 10.18869/acadpub.isfj 2018 27 4 Optimum feeding percentage in nursery phase of yellowfin seabream (Acanthopagrus latus M. Mozanzadeh Torfi mansour.torfi@gmail.com E. Pagheh esmaeilpaghe@gmail.com M. Zabayeh Najafabadi zabayeh2005@gmail.com J. Ghafleh Marammazi jmarammazi@yahoo.com S.J. Hosseini hosseinijavad@yahoo.com Sh. Mehrjooyan shapoorkahkesh@yahoo.com A.R. Osooli rahimoosooli@yahoo.com H. Saghavi saghavih@gmail.com J. Monem monemjavad@yahoo.com A 30-day research was conducted to evaluate the effects of different feeding rate (2, 4, 6, 8 and 10% of wet body weight/day) and also fresh food (20% of wet body weight/day) on growth performance and feed utilization of Acanthopagrus latus fry in nursery phase. Fish that fed with fresh food had the lowest survival rate and feed efficiency in comparison with other treatments. Growth performance including final weight and specific growth rate (SGR) significantly increased with increasing feeding rate (p< 0.05). The relationship between SGR (% per day) and ration level (% per day) was an asymptotic curve described as SGR=0.3196X+0.7319. There were not significant differences in hepatosomatic, viscerosomatic and condition factor indices among different treatments. Based on the above results, it may be concluded that a ration size of 8% of body weight per day is optimal for good growth and feed conversion efficiency of juvenile A. latus in nursery phase. Feeding rate Nursery Phase Fresh Food Dry Feed Acanthopagrus latus 2018 10 01 165 168 http://isfj.ir/article-1-1847-en.pdf 10.22092/ISFJ.2018.117753