Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Investigating the effects of photoperiod on growth performance and sextual maturation of Caspian trout (Salmo trutta caspius)Investigating the effects of photoperiod on growth performance and sextual maturation of Caspian trout (Salmo trutta caspius)11012353310.22092/isfj.2021.123533FAN. AghA. IraniJournal Article20210222Photoperiod is one of the very important environmental factors that extremely affect growth performance, feeding and reproduction of various fish species. Thus In this research effects of different photoperiod regimes on Caspian Salmon during the premature stage (18 months old at the beginning of experiment) were investigated. One thousand liter tank with 20 premature fishs were allocated for each treatment. Applied photoperiod regimes during 6 months experimental period were: (1) continues light (24L/0D), (2) 18L/6D during first three months and 6L/18D during second three months, (3) 6L/18D during first three months and 18L/6D during second three months and (4) continues dark (0L/24D). Results indicated that growth performance, feeding and reproduction were influenced by the photoperiod regimes. The highest values of SGR (0.44 % d<sup>-</sup>) and the lowest values of FCR (4/3) were observed in treatment 4 that showed significant differences as compared with treatment 1 (0.35 % d<sup>-</sup> and 4.4) treatment 2 (0.33 % d<sup>-</sup> and 4.7) and treatment 3 (0.34 % d<sup>-</sup> and 4.5). Maturation of females was not influenced by experimental photoperiod regimes but maturation of males was significantly influenced. As all males of treatment 2 reached sexual maturity at the end of experiment. In contrast, treatments 3 and 4 postponed gonad development and maturation of males. Therefore, to increase the growth of Caspian salmon, the 24-hour dark photoperiod and to stimulate its sexual maturation, the 18 and 6-hour light photpperiod is recomonded in the first and second trimesters of the six-month photpperiod regime, respectively.Photoperiod is one of the very important environmental factors that extremely affect growth performance, feeding and reproduction of various fish species. Thus In this research effects of different photoperiod regimes on Caspian Salmon during the premature stage (18 months old at the beginning of experiment) were investigated. One thousand liter tank with 20 premature fishs were allocated for each treatment. Applied photoperiod regimes during 6 months experimental period were: (1) continues light (24L/0D), (2) 18L/6D during first three months and 6L/18D during second three months, (3) 6L/18D during first three months and 18L/6D during second three months and (4) continues dark (0L/24D). Results indicated that growth performance, feeding and reproduction were influenced by the photoperiod regimes. The highest values of SGR (0.44 % d<sup>-</sup>) and the lowest values of FCR (4/3) were observed in treatment 4 that showed significant differences as compared with treatment 1 (0.35 % d<sup>-</sup> and 4.4) treatment 2 (0.33 % d<sup>-</sup> and 4.7) and treatment 3 (0.34 % d<sup>-</sup> and 4.5). Maturation of females was not influenced by experimental photoperiod regimes but maturation of males was significantly influenced. As all males of treatment 2 reached sexual maturity at the end of experiment. In contrast, treatments 3 and 4 postponed gonad development and maturation of males. Therefore, to increase the growth of Caspian salmon, the 24-hour dark photoperiod and to stimulate its sexual maturation, the 18 and 6-hour light photpperiod is recomonded in the first and second trimesters of the six-month photpperiod regime, respectively.Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Study on abiotic factors of water in the vicinity of marine cage culture in southern coast of the Caspian Sea, Abbas Abad area.Study on abiotic factors of water in the vicinity of marine cage culture in southern coast of the Caspian Sea, Abbas Abad area.112812353410.22092/isfj.2021.123534FAE. KarimianM. ZakeriS.M.V. FarabiM. HaqiP. KochanianJournal Article20210222This study was carried out to determine the effect of raibow trout cage culture on the abiotic factors of water in the Abbas Abad area, southern basin of the Caspian Sea. For this purpose, water samples were collected at distances of 5, 50, 100 and 1000 m from the cage culture during December 2014 to August 2015. Based on the results, it was shown that the mean value of water temperature for surface layer varied between 12.2 and 30.16 °C from December to August. The highest and lowest mean value of salinity obtained in August (11.26 g/l) and April (10.66 g/l) respectively. The range of pH value changes (8.36-8.83) was as small as the rate of electro conductivity variations (18.11-19.07 µs/cm). The highest concentration of dissolved oxygen was observed in December at 1000 m station (9.23 mg/l) and the lowest was seen in April at 5 m station (7.27 mg/l). Also the mean values of Total Dissolved Solids, Turbidity, Nitrite, Nitrate, ammonium, Total Nitrogen, Phosphate and Total Phosphorus was obtained 9.59 (g/l), 5.55 (NTU), 3.67, 133.45, 92.6, 929.72, 21.63, 37.73 (µg/l) respectively. The results of abiotic factors of water showed that most of the measured parameters had significant differences only among different sampling periods (p < 0.05) whilst, for some factors such as dissolved oxygen, ion ammonium and phosphate, there were significant differences between different stations (The effect of distance from the cage) at each sampling period as well as (p < 0.05). It seems that the cage culture of rainbow trout in the Abbas Abad area had only a minor impact on measured factors probably due to low stocking density, short-term of fish farm and high current velocity.This study was carried out to determine the effect of raibow trout cage culture on the abiotic factors of water in the Abbas Abad area, southern basin of the Caspian Sea. For this purpose, water samples were collected at distances of 5, 50, 100 and 1000 m from the cage culture during December 2014 to August 2015. Based on the results, it was shown that the mean value of water temperature for surface layer varied between 12.2 and 30.16 °C from December to August. The highest and lowest mean value of salinity obtained in August (11.26 g/l) and April (10.66 g/l) respectively. The range of pH value changes (8.36-8.83) was as small as the rate of electro conductivity variations (18.11-19.07 µs/cm). The highest concentration of dissolved oxygen was observed in December at 1000 m station (9.23 mg/l) and the lowest was seen in April at 5 m station (7.27 mg/l). Also the mean values of Total Dissolved Solids, Turbidity, Nitrite, Nitrate, ammonium, Total Nitrogen, Phosphate and Total Phosphorus was obtained 9.59 (g/l), 5.55 (NTU), 3.67, 133.45, 92.6, 929.72, 21.63, 37.73 (µg/l) respectively. The results of abiotic factors of water showed that most of the measured parameters had significant differences only among different sampling periods (p < 0.05) whilst, for some factors such as dissolved oxygen, ion ammonium and phosphate, there were significant differences between different stations (The effect of distance from the cage) at each sampling period as well as (p < 0.05). It seems that the cage culture of rainbow trout in the Abbas Abad area had only a minor impact on measured factors probably due to low stocking density, short-term of fish farm and high current velocity.Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Effect of hydrolysis time on the antioxidant activity of Common carp (Cyprinus carpio) head protein hydrolysateEffect of hydrolysis time on the antioxidant activity of Common carp (Cyprinus carpio) head protein hydrolysate422912353610.22092/isfj.2021.123536FAS. YeganehM. Esmaeili KharyekiH. AhamdiJournal Article20210222In the present study, the antioxidant activity of different concentrations of protein hydrolysate from Common carp (<em>Cyprinus carpio</em>) head at different hydrolysis time was investigated. For this purpose, 8 Common carp fish with average weight of 0.766±0.034 kg were prepared from market. Fish heads were hydrolyzed by Alcalase (1% v/w at 55˚C and pH 8) at different hydrolysis times (30, 60, 120 and 180 min). The result of proximate analysis showed that the protein content increased significantly (from 58.31±1.9 to 75.26±1.49%) as a result of hydrolysis, while the amount of fat and ash decreased significantly (from 16.46±0.87 to 2.37±0.97%; from 27.16±0.64 to 25.34±1.63%, respectively, p < 0.05). Also, as the duration of hydrolysis increased, the amount of soluble protein and the degree of hydrolysis increased significantly, so that the highest soluble protein 23.01±0.19 mg/ml and the highest degree of hydrolysis 49.67±0.86% were obtained at the time of 180 min. DPPH radical scavenging activity of protein hydrolysate showed significant increasing trend at different hydrolysis times and different concentrations (p < 0.05). The optimum time for DPPH radical scavenging activity (DPPH) was determined at 180 min and IC<sub>50</sub> value was obtained 2.08 mg/ml. In addition, with increasing concentration and duration of hydrolysis, the ferric ion reduction power and ABTS radical scavenging activity increased significantly (p < 0.05). In general, due to the proper activity of different concentrations of Common carp head protein hydrolysate on DPPH and ABTS radicals scavenging and reduction of ferric ion, it can be stated that this protein hydrolysate can be considered as a dietary supplement with desirable antioxidant function.In the present study, the antioxidant activity of different concentrations of protein hydrolysate from Common carp (<em>Cyprinus carpio</em>) head at different hydrolysis time was investigated. For this purpose, 8 Common carp fish with average weight of 0.766±0.034 kg were prepared from market. Fish heads were hydrolyzed by Alcalase (1% v/w at 55˚C and pH 8) at different hydrolysis times (30, 60, 120 and 180 min). The result of proximate analysis showed that the protein content increased significantly (from 58.31±1.9 to 75.26±1.49%) as a result of hydrolysis, while the amount of fat and ash decreased significantly (from 16.46±0.87 to 2.37±0.97%; from 27.16±0.64 to 25.34±1.63%, respectively, p < 0.05). Also, as the duration of hydrolysis increased, the amount of soluble protein and the degree of hydrolysis increased significantly, so that the highest soluble protein 23.01±0.19 mg/ml and the highest degree of hydrolysis 49.67±0.86% were obtained at the time of 180 min. DPPH radical scavenging activity of protein hydrolysate showed significant increasing trend at different hydrolysis times and different concentrations (p < 0.05). The optimum time for DPPH radical scavenging activity (DPPH) was determined at 180 min and IC<sub>50</sub> value was obtained 2.08 mg/ml. In addition, with increasing concentration and duration of hydrolysis, the ferric ion reduction power and ABTS radical scavenging activity increased significantly (p < 0.05). In general, due to the proper activity of different concentrations of Common carp head protein hydrolysate on DPPH and ABTS radicals scavenging and reduction of ferric ion, it can be stated that this protein hydrolysate can be considered as a dietary supplement with desirable antioxidant function.Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219The effects of different concentrations of selenium and zinc nanoparticles on growth performance, survival and chemical composition of Whiteleg shrimp (Litopenaeus vannamei)The effects of different concentrations of selenium and zinc nanoparticles on growth performance, survival and chemical composition of Whiteleg shrimp (Litopenaeus vannamei)435112353710.22092/isfj.2021.123537FAM. KaramzadehM. YahyaviA. SalarzadehD. Nokhbe ZareJournal Article20210222This study was conducted to evaluate the effect of differentconcentrations of selenium and zinc nanoparticles on growth performance, survival and chemical composition of Whiteleg shrimp (<em>Litopenaeus vannamei</em>). For this purpose, shrimp with an average weight of 5.1±0.2 g were distributed in 12 fiberglass tanks with 25 shrimp density and were fed for 56 days with differentconcentrations of selenium and zinc nanoparticles in four groups with three replicate including 0 (control), T<sub>1</sub> (0.3 mg/kg of selenium nanoparticl), T<sub>2</sub> (0.15 mg/kg of selenium nanoparticle+ 15 mg/kg of zinc nanoparticl) and T<sub>3</sub> ( 30 mg/kg of zinc nanoparticl). Based on these results, weight gain increasing, specific growth rate and feed conversion ratio in T<sub>2</sub> treatment compare to T<sub>1</sub>, T<sub>3</sub> and control treatments (p < 0.05). Also, there is significant differences in survival rate between T<sub>1</sub> and T<sub>2</sub> treatments compared to T<sub>3</sub> and control (p < 0.05). Statistical analysis showed that there was a significant difference in protein and lipid carcass percentage between shrimp-fed diets containing different levels of selenium and zinc nanoparticles compared to control treatment. In general, the effect of differentconcentrations of selenium and zinc nanoparticles, especially in the T<sub>2</sub> on growth performance, survival and chemical composition was positively and significantly evaluated. <br /><strong> </strong>This study was conducted to evaluate the effect of differentconcentrations of selenium and zinc nanoparticles on growth performance, survival and chemical composition of Whiteleg shrimp (<em>Litopenaeus vannamei</em>). For this purpose, shrimp with an average weight of 5.1±0.2 g were distributed in 12 fiberglass tanks with 25 shrimp density and were fed for 56 days with differentconcentrations of selenium and zinc nanoparticles in four groups with three replicate including 0 (control), T<sub>1</sub> (0.3 mg/kg of selenium nanoparticl), T<sub>2</sub> (0.15 mg/kg of selenium nanoparticle+ 15 mg/kg of zinc nanoparticl) and T<sub>3</sub> ( 30 mg/kg of zinc nanoparticl). Based on these results, weight gain increasing, specific growth rate and feed conversion ratio in T<sub>2</sub> treatment compare to T<sub>1</sub>, T<sub>3</sub> and control treatments (p < 0.05). Also, there is significant differences in survival rate between T<sub>1</sub> and T<sub>2</sub> treatments compared to T<sub>3</sub> and control (p < 0.05). Statistical analysis showed that there was a significant difference in protein and lipid carcass percentage between shrimp-fed diets containing different levels of selenium and zinc nanoparticles compared to control treatment. In general, the effect of differentconcentrations of selenium and zinc nanoparticles, especially in the T<sub>2</sub> on growth performance, survival and chemical composition was positively and significantly evaluated. <br /><strong> </strong>Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219The compression of antioxidant activity and β-carotene extracted from three species of native algae of Oman Sea (Ulva lactuca, Sargassum ilicifolium and Nizimuddinia zanardini)The compression of antioxidant activity and β-carotene extracted from three species of native algae of Oman Sea (Ulva lactuca, Sargassum ilicifolium and Nizimuddinia zanardini)536312353810.22092/isfj.2021.123538FAE. Sarani YaztapehM.R. Hosseini TabatabaeiA.M. AbkenarJournal Article20210222In this study, pharmacological properties of three native macro algae which collected from the shores of the Chabahar Gulf (the Omean Sea) including: <em>Ulva lactuca</em>, <em>Sargassum ilicifolium </em>and <em>Nizimuddinia zanardini</em> were evaluated. The methanol extracts of three species of green, brown and red algae were. The concentration of β-carotenoid, phenolic Compound and antioxidant activities (AOA) was analyzed by routine methods. Based on the results, different antioxidant properties were observed among algae. These results probably was associated with antioxidant compounds of algae. In the species of <em>U. lactuca, S. ilicifolium</em>and <em>N. zanardini</em> the amount of β-carotenoid was measured 0.56, 0.048 and 0.041 mg/100DW, total phenol was 0.206, 0.396 and 0.133 mg GA/g DW and inhibitory activity of free radicals (DPPH) was in the range of 45.7-60.4%, 51.6-61.8% and 9.6-28%, respectively (p < 0.05). Based on obtaining results, the highest level of β- carotenoid was observed in <em>the U. lactuca</em> extract and the highest level of total phenol and inhibitory activity of free radicals (DPPH) was observed in <em>S. ilicifolium</em> extract. Overall, the results of this study indicated that all three species of algae have usability as a primary substance in food and drug industry.In this study, pharmacological properties of three native macro algae which collected from the shores of the Chabahar Gulf (the Omean Sea) including: <em>Ulva lactuca</em>, <em>Sargassum ilicifolium </em>and <em>Nizimuddinia zanardini</em> were evaluated. The methanol extracts of three species of green, brown and red algae were. The concentration of β-carotenoid, phenolic Compound and antioxidant activities (AOA) was analyzed by routine methods. Based on the results, different antioxidant properties were observed among algae. These results probably was associated with antioxidant compounds of algae. In the species of <em>U. lactuca, S. ilicifolium</em>and <em>N. zanardini</em> the amount of β-carotenoid was measured 0.56, 0.048 and 0.041 mg/100DW, total phenol was 0.206, 0.396 and 0.133 mg GA/g DW and inhibitory activity of free radicals (DPPH) was in the range of 45.7-60.4%, 51.6-61.8% and 9.6-28%, respectively (p < 0.05). Based on obtaining results, the highest level of β- carotenoid was observed in <em>the U. lactuca</em> extract and the highest level of total phenol and inhibitory activity of free radicals (DPPH) was observed in <em>S. ilicifolium</em> extract. Overall, the results of this study indicated that all three species of algae have usability as a primary substance in food and drug industry.Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Evaluation of genetic variability of longspine scraper Capoeta trutta (Heckel, 1843) populations from Kurdistan province using IRAP markersEvaluation of genetic variability of longspine scraper Capoeta trutta (Heckel, 1843) populations from Kurdistan province using IRAP markers657612353910.22092/isfj.2021.123539FAZ. MehrabaniB. Bahrami KamangarE. GhaderiJournal Article20210222Genetic variability of longspine scraperpopulations from the Choman, Shui, Garmab (Baneh region), Gheshlagh, Sirvan, Gaveh-Rud (Sirvan region), Rowar (Marivan region) of Kurdistan province were examined using Inter-Retrotransposon Amplified Polymorphism markers (IRAP) method. IRAP molecular markers data analysis showed the highest and the lowest number of bands, polymorphic bands, percent of polymorphic bands, number of different bands, number of private bands, number of effective bands, Shannon's information index and expected heterozygosity in the Rowar and the Garmab populations, respectively. The highest and the lowest genetic distance was observed between the Rowar and the Shui populations and between the Choman and the Garmab populations, respectively. The molecular variance analysis results revealed that 9% of genetic variance was between geographic regions, 16% among and 75% within the populations. The highest and lowest gene flow rates (number of migrations per generation) were observed among the Choman, Garmab, Rowar and Shui populations, respectively. Phylogentic relationships of the populations were evaluated using the maximum parsimony methods. Phylogenetic analysis showed that the Marivan region is in a sister clade with the regions of Baneh and Sirvan. The results of this study showed that although the longspine scraper population of Marivan region was different from other populations, the existence of similarities prevents its complete separation. However, fish belonging to each population of the studied geographical areas can be distinguished by their private bands. The results of this research showed that the IRAP marker has high reproducibility and greater power in detecting genetic diversity and can be used effectively to study the genetic diversity of fish, including the longspine scraper species. <br /> Genetic variability of longspine scraperpopulations from the Choman, Shui, Garmab (Baneh region), Gheshlagh, Sirvan, Gaveh-Rud (Sirvan region), Rowar (Marivan region) of Kurdistan province were examined using Inter-Retrotransposon Amplified Polymorphism markers (IRAP) method. IRAP molecular markers data analysis showed the highest and the lowest number of bands, polymorphic bands, percent of polymorphic bands, number of different bands, number of private bands, number of effective bands, Shannon's information index and expected heterozygosity in the Rowar and the Garmab populations, respectively. The highest and the lowest genetic distance was observed between the Rowar and the Shui populations and between the Choman and the Garmab populations, respectively. The molecular variance analysis results revealed that 9% of genetic variance was between geographic regions, 16% among and 75% within the populations. The highest and lowest gene flow rates (number of migrations per generation) were observed among the Choman, Garmab, Rowar and Shui populations, respectively. Phylogentic relationships of the populations were evaluated using the maximum parsimony methods. Phylogenetic analysis showed that the Marivan region is in a sister clade with the regions of Baneh and Sirvan. The results of this study showed that although the longspine scraper population of Marivan region was different from other populations, the existence of similarities prevents its complete separation. However, fish belonging to each population of the studied geographical areas can be distinguished by their private bands. The results of this research showed that the IRAP marker has high reproducibility and greater power in detecting genetic diversity and can be used effectively to study the genetic diversity of fish, including the longspine scraper species. <br /> Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Pseudoparasites of some wild fish and cage culture rainbow trout (Oncorhynchus mykiss) in the southern coast of the Caspian SeaPseudoparasites of some wild fish and cage culture rainbow trout (Oncorhynchus mykiss) in the southern coast of the Caspian Sea778412358110.22092/isfj.2021.123581FAMabood Alizadeh NodehJamileh PazookiJournal Article20210302Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Temporal and spatial variations of macrobenthic invertebrate community and water quality of Pasikhan River, GuilanTemporal and spatial variations of macrobenthic invertebrate community and water quality of Pasikhan River, Guilan859712367010.22092/isfj.2021.123670FAF. ShariatiA. OmidiJournal Article20210313Water quality assessment using water quality indices and biotic indices is a group of suitable methods. This study was carried out to determine temporal and spatial variations of benthos in Pasikhan River, north of Iran. Therefore, 6 sampling stations were set up along the river mainstream and the macrobenthic invertebrate community samples were collected from these stations during 4 seasons (from autumn 2015 to summer 2016), seasonally. The benthos samples were collected by surber sampler (25×25 cm) in sixteen replicates, then were identified and counted. The results of the benthic communities of Pasikhan River showed the dominant taxa of the invertebrates collected belonged to aquatic insects group. In this study, 18 families of 9 orders of benthic macroinvertebrates were identified. BMWP index at sixth station, showed the lowest annual average score (5.50±2.38) with so bad quality and the second station, showed the highest average score (41.00±16.39) with medium quality. Also, according to the annual average ASPT, second station had the highest score (5.83±0.38), and showed suspected to water pollution. The sixth station with the lowest score (2.50±0.91) was classified in high pollution group. Among the seasons, the highest and the lowest amount of both BMWP and ASPT were observed in winter and autumn, respectively. <br />The results of Hilsenhoff index between stations showed that first station with average score (5.26±1.10) was categorized in medium class and fourth station with average score (4.58±0.56) was categorized in good class. This could be due to sand mining before first station (Bodab Bridge). Based on the results, biotic indices showed that water quality in Nokhale station (Station 6) that is located in downstream is the lowest that may be due to anthropogenic activities, discharge of domestic wastewater and agricultural runoff and sand mining. Water quality assessment using water quality indices and biotic indices is a group of suitable methods. This study was carried out to determine temporal and spatial variations of benthos in Pasikhan River, north of Iran. Therefore, 6 sampling stations were set up along the river mainstream and the macrobenthic invertebrate community samples were collected from these stations during 4 seasons (from autumn 2015 to summer 2016), seasonally. The benthos samples were collected by surber sampler (25×25 cm) in sixteen replicates, then were identified and counted. The results of the benthic communities of Pasikhan River showed the dominant taxa of the invertebrates collected belonged to aquatic insects group. In this study, 18 families of 9 orders of benthic macroinvertebrates were identified. BMWP index at sixth station, showed the lowest annual average score (5.50±2.38) with so bad quality and the second station, showed the highest average score (41.00±16.39) with medium quality. Also, according to the annual average ASPT, second station had the highest score (5.83±0.38), and showed suspected to water pollution. The sixth station with the lowest score (2.50±0.91) was classified in high pollution group. Among the seasons, the highest and the lowest amount of both BMWP and ASPT were observed in winter and autumn, respectively. <br />The results of Hilsenhoff index between stations showed that first station with average score (5.26±1.10) was categorized in medium class and fourth station with average score (4.58±0.56) was categorized in good class. This could be due to sand mining before first station (Bodab Bridge). Based on the results, biotic indices showed that water quality in Nokhale station (Station 6) that is located in downstream is the lowest that may be due to anthropogenic activities, discharge of domestic wastewater and agricultural runoff and sand mining. Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Growth rate and pigment contents of grown Dunaliella viridis microalgae in different levels of a fishmeal factory wastewaterGrowth rate and pigment contents of grown Dunaliella viridis microalgae in different levels of a fishmeal factory wastewater9910712367210.22092/isfj.2021.123672FAZ. HadizadehM. Shamsaei MehrganS.P. Hosseini ShekarabiJournal Article20210313The present study investigated the cultivation of <em>Dunaliella viridis</em> microalgae in the stickwater (SW) from the wastewater of fishmeal factories. For this purpose, Gillard culture medium (F/2) was used as a control treatment and five different levels of SW including 10, 25, 50, 75, and 100% were used. Then, these microalgae were cultured in 8-liter plastic containers for 14 days to evaluate the algal density and pigment contents (chlorophyll <em>a</em> and total carotenoids). The results of the present study showed that by increasing in the concentration of SW up to 75% the cell density was increased. In addition, the pigment contents were significantly affected by SW concentrations and the highest amount of chlorophyll <em>a</em> was observed at a concentration of 75% SW compared to other treatments (p < 0.05). Also, the highest amount of carotenoids was recorded simultaneously in 75% and 50% SW treatments compared to other treatments (p < 0.05). According to the obtained results, using SW at 75% is feasible to grow <em>D. viridis</em> microalgae.The present study investigated the cultivation of <em>Dunaliella viridis</em> microalgae in the stickwater (SW) from the wastewater of fishmeal factories. For this purpose, Gillard culture medium (F/2) was used as a control treatment and five different levels of SW including 10, 25, 50, 75, and 100% were used. Then, these microalgae were cultured in 8-liter plastic containers for 14 days to evaluate the algal density and pigment contents (chlorophyll <em>a</em> and total carotenoids). The results of the present study showed that by increasing in the concentration of SW up to 75% the cell density was increased. In addition, the pigment contents were significantly affected by SW concentrations and the highest amount of chlorophyll <em>a</em> was observed at a concentration of 75% SW compared to other treatments (p < 0.05). Also, the highest amount of carotenoids was recorded simultaneously in 75% and 50% SW treatments compared to other treatments (p < 0.05). According to the obtained results, using SW at 75% is feasible to grow <em>D. viridis</em> microalgae.Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Evaluation of flocculation induced by pH increase on harvest efficiency and fatty acids content of microalgae Dunaliella salina, isolated from Lipar lagoon- ChabaharEvaluation of flocculation induced by pH increase on harvest efficiency and fatty acids content of microalgae Dunaliella salina, isolated from Lipar lagoon- Chabahar10912012367610.22092/isfj.2021.123676FASamereh ArbabiPariya AkbariZahra Amini KhoiJournal Article20210314Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Determination of the appropriate mesh size of drift gillnet for Skipjack tuna (Katsuwonus pelamis (Linnaeus, 1758)) by indirect methodDetermination of the appropriate mesh size of drift gillnet for Skipjack tuna (Katsuwonus pelamis (Linnaeus, 1758)) by indirect method12113112371210.22092/isfj.2021.123712FASeid Yoosef PaighambariMohammad SaberiParviz ZarheSaid GorginManochehr BabanezhadJournal Article20210316Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Effect of sub-lethal toxicity of diazinon on steroid detoxification and quality of sexual production in male goldfish breeders (Carassius auratus)Effect of sub-lethal toxicity of diazinon on steroid detoxification and quality of sexual production in male goldfish breeders (Carassius auratus)13314212373410.22092/isfj.2021.123734FASeyed Rohollah JavadianHananeh SamadiMohammadreza ImanpoorJournal Article20210317Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Socio-Economic analysis of fresh Fish marketing in Golestan provinceSocio-Economic analysis of fresh Fish marketing in Golestan province14315412380410.22092/isfj.2021.123804FAAfshin AdeliMajid EstarmiHosseini Seid MehrdadJournal Article20210404Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Optimization of common carp pre-slaughter by using TBA index and Response Surface Methodology (RSM)Optimization of common carp pre-slaughter by using TBA index and Response Surface Methodology (RSM)15516612380510.22092/isfj.2021.123805FAMohsen Shahriyari MoghaddamGholamreza BakhtiyariEbrahim Alizadeh DooghikolaiMohsen SamimiJournal Article20210404Agricultural Research,Education and Extension OrganizationIranian Scientific Fisheries Journal1026-135429620210219Extraction, Antioxidant and Emulsifying Properties of Alginate from Brown Seaweed Sargassum ilicifoliumExtraction, Antioxidant and Emulsifying Properties of Alginate from Brown Seaweed Sargassum ilicifolium16717812386010.22092/isfj.2021.123860FAMasoud RezaeiSamira JediMahdi Al -BofetiliehJournal Article20210412