سعید گرگین

This study was conducted to study the catch composition of Largehead hairtail (Trichiurus lepturus) hand and line and some biological characters of T. lepturus in northern waters of Oman Sea (Remin fishing port).  Sampling was done by hand and line used in the region by four motor boats each of which included 4 fishermen from February to May 2022. 6955 fish were caught which include T. lepturus, Sphyraena jello, Carangoides chrysophrys, Terapon jarbua, Strongylura strongylura and Otolithes ruber. Among them T. lepturus with 97.66% had the highest percentage and O. ruber with 0.01% had the lowest percentage of catch. The maximum and minimum total length of T. lepturus caught were 128 cm and 42 cm, respectively. The optimal size of T. lepturus was 85.63 cm and the infinite length was estimated at 131.13 cm. Also, the length of sexual maturity was calculated as 66.57 cm. The results showed 84.36% of T. lepturus were mature and only 15.64% had a length less than the length of the first sexual maturity

The purpose of the study is to investigate the catch composition, the amount of by- catch, the length frequency and the catch per unit of effort of bottom gillnets for catching the Tigertooth croaker, using mesh size of 73, 85 and 90 mm in the waters of the Oman Sea in the period of winter 2018 to the late spring of 2019. 973 pieces of fish including 15 families were caught, and the highest catch rate was 63.81% for the Tigertooth croaker. The rate of by- catch was 8.76%. The amount of CPUE for the mentioned mesh size was estimated as 552.9, 808.9 and 456.9 grams per net day respectively. By examining the length frequency distribution in all the meshes, it was determined that the highest frequency is in the length of 32-36 cm with 43.67%. Also, an average length of 31.80±6.64 cm was recorded in the whole operation. According to the first maturity length of the Tigertooth croaker, it was determined that the bottom gillnets available in the Chabahar region fishing grounds had a catch below the standard size, and it seems the mesh size of the net should be reviewed and standardized.

Blacktip Sea Catfish (Plicofollis dussumieri) is one of the most abundant commercial species along the coast of the Oman Sea. In this study, with the aim of an investigation some biological parameters of Blacktip Sea Catfish using gillnet and purse seine in coastal waters of Sistan and Baluchistan province (Oman Sea). Sampling was conducted from January to March 2020 and 818 P. dussumieri were collected using gillnet and 300 P. dussumieri were collected using purse seine and the fork length range of P. dussumieri was 22.10-62.10 cm and 17.30-10.37 cm in gillnet and purse seine, respectively. The Asymptotic length (L∞) was estimated at 64.41 cm and the optimal catch length was 34.41 cm. The length maturity (Lm50) of P. dussumieri was calculated to be 32.5 cm. The results show 38.10% of the fish caught were immature and did not have a chance to spawn. Most of the P. dussumieri that were caught by purse seine were smaller than length at maturity (Lm50). Obtaining such parameters with studies and long-term planning of these stocks and the information related to the length frequency, Asymptotic length, optimum catchable length and length at maturity can have a great impact on the knowledge of the stocks and fishing pressure on aquatic stocks such as P. dussumieri in Sistan and Baluchistan province.

Black Pomfret (Parastromateus niger) is one of the most important commercial species along the coast of the Oman Sea. In this study, the length frequency, weight, length-girth relationship, infinite length (L_∞) and optimum length were investigated in the coastal waters of Sistan and Baluchistan. Sampling were carried out from November to December 2020. The length range of Black Pomfret was 18-45.40 cm and its optimum length was 29.6 cm. The minimum and maximum weight was 112-1900 g with a mean weight of 396.453 g in Black Pomfret. The length-weight relationship of Black Pomfret was calculated as W= 0.0094TL3.2016. The correlation coefficient (R2) was 0.9622. The results showed that the calculated value of b parameter (3.2016), which indicates the natural growth of this species in Oman Sea, is positive allometric. The total length-girth relationship of Black Pomfret was calculated as Gmax=1.0555Gg+1.7124. The correlation coefficient (R2) was 0.9247. The L_∞was estimated at 47.3 cm. The length maturity (Lm50) of Black Pomfret was calculated to be 26.6 cm, and 65% of the fish caught were immature and did not have a chance to spawn. With studies and long-term planning of these stocks and the information related to the length frequency, weight, length-weight relationships, length-girth relationships and optimum length can have a great impact on the knowledge of the stocks of these fish and reduce fishing pressure on aquatic resources such as black Pomfret in Sistan and Baluchistan province.

This study aims to analyze the fishing trend and predict the future catch of Persian sturgeon (Acipenser persicus) stocks by DB-SRA and dynamic models in the southern shores of the Caspian Sea. The results showed that, according to the size of the initial population in 2018, equal to 153 spicemens(mean weigth 30kg); assuming a constant rate of catch from the population equivalentto 0.2 per year (half of the current catch); until the next 30 years (2050), the amount of catching of Persian sturgeon will increase until the stocks of this species have the ability to fully restore themselves. While assuming the current catch rate, there has been a sharp decrease in the catch of fish in the southern shores of the Caspian Sea; it is estimated that the stocks of this type of sturgeon fish will be extinct by 2050

In the research, the demographics of recreational fishermen of some fishing clubs in Tehran province were investigated. The research was done in a period of one year, with monthly face-to-face interviews with the recreational fishermen present in the clubs from March 2022 to March 2023 by a researcher-made questionnaire. Demographic factors including: gender, age, marital status, education, occupation and monthly income were investigated through questionnaires. The data obtained from the questionnaire was analyzed using SPSS software. The results showed that men participate in recreational fishing much more than women. In addition, the age distribution was different, adults (31 to 40 years old) participated the most. While people under 10 years of age did not participate in this field. Among them, people with higher education (bachelor's degree) had the highest participation compared to people with low education. This study provides more insight into the fishing culture in Iran. In addition, this partnership model can be used for future recreational fishing partnerships.

The process of catching fishing gear that goes out of control is called ghost fishing. Abandoned, lost or discarded fishing gears (ALDFG) can cause adverse economic and environmental effects. Passive fishing gears, such as cages, produce more severe effects after being released into the water. Gargoors are one of the types of cages, which every year a large number of them are left in the sea in the Persian Gulf and the Oman Sea, for various reasons. In recent years, a new generation of gargoors with a rebar body covered with net are used in the waters of Bushehr. In this study, which was conducted from November to July 1400 in the waters of Bushehr, totally, in 310 cruises in 30 coordinates, by 9 vessels, 90 gargoors made of rebar were surveyed. All of them were baited with wolf herring and catfish. 24 species from 12 families were identified. The most observed species was Orange-spotted grouper (Epinephelus coioides). The results showed that all the gargoors made of rebar, if they are not lost, return to the land after the end of fishing. The main reasons for getting lost were theft, trawling, and bottom gillnets, respectively. Also, to confirm the sampling results, 40 questionnaires were distributed among the fishermen. According to the results, rebar gargoors are preferred over wire gargoors in terms of life, strength, economic efficiency and lower amount of ALDFG. It is recommended that researchers combine their knowledge with the experiences of fishermen to design gargoors with fewer disadvantages while maintaining the merits of different gargoor models, especially from the economic and environmental point of view.

The research study the effect of changing light color on the length and weight composition of common sprat (C. caspia) catch in conical lift net with a mesh size of 8 mm (knot to knot). For this purpose, in January 2018 the sprat fish caught by three fishing vessels during 30 times of fishing operations at 50-40 m depth in Amirabad fishing port. The results showed that from total number of 2874 caught, C. caspia with 79% was the most catch and C. engrauliformis and C. grimmi with 14% and 7% of the catch, respectively. Fish caught in blue light had a larger length range and more weight. While the fish caught in red light had the lowest length range and the lowest weight. In blue and red light, the highest and lowest average length and weight of C. caspia was 11.59 cm, 11.00 cm, 11.47 grams, and 11.00 grams, respectively. The length and weight of C. caspia caught in white light was intermediate.  The average length and weight of C. caspia caught using blue and red color, and white and red color had a significant difference (p<0.05).

Extensive lack of data and information gaps for recreational fishing necessitate knowledge of the species caught to establish aquatic reserve management. Therefore, in the present study in 2021, by collecting lenght and weight information of major recreational fishes in the main recreational fishing area was done with hooks. The results showed that between the length and weight of common carp in Golestan, Mazandaran and Golestan provinces, the equations were 0.444004x4004 and 0.4652/168x2/4652 with a correlation of 90%, 95% and 94%, respectively. Between the length and weight of grass carp in Golestan, Mazandaran and Golestan provinces, the equations 0.2398x2 / 2398 and 0.6333x2 / 1313 and 30.3x1 / 7769, respectively, with a correlation rate of 96%, 94% and 90% were established and between the length-weight of yellow fish in Golestan, Mazandaran and Golestan provinces were equations of 0.494x3 / 113, 1101x1 / 4615 and 982x1 / 1381, respectively, with a correlation of 89%, 90% and 97%. The results showed allometric growth of all three species in all studied provinces. The allometric growth rate of common and yellow carp was positive in Golestan province and negative in Guilan and Mazandaran provinces. Allometric growth rate of herbivorous carp was negative in all studied provinces .

Longtail tuna (Thunnus tonggol) is an important commercial species. This species is often caught in the Oman Sea by gill net. This study was conducted to study the selectivity of longtail tuna gill net based on the length-body girth relationship from January to July 2019 monthly in Bryce, Ramin, and Konarak sampling areas. For this purpose, the caught fish were collected and the data of Longtail tuna was measured from the eye, pre-operculum, operculum, and maximum body height at each stage of sampling. Then, the net selection curve and the optimal length of the longtail tuna were calculated by the gill net selectivity model based on the net mesh size. From the results, the maximum fish length was estimated at 40, 50, 56, 65, 68, and 80 cm for the net mesh sizes of 10.1, 11.4, 13.2, 14.6, 15.2 and 17.8 cm, respectively. According to Lm50 of longtail tuna at 73.3 cm fork length, the fish caught with mesh size of 17.8 cm has a fork length greater than the average sexual maturity length of the fish. Therefore, taking into account the catch of the target species, T. tonggol, the results showed that mesh size of 10.1, 11.4, 13.2, 14.6, 15.2 cm are not suitable for catching T. tonggol in the Oman Sea. The use of 17.8 cm mesh size with the purpose of catching adult T. tonggol would be suggested for sustainable and responsible fishing for this species.

Effluents from fish farms have high levels of nitrate and phosphate. In the present study, the removal of nitrate and phosphate from aquatic farm effluent was investigated by nanosilica adsorbent modified with mineral pumice. For this purpose, the desired adsorbent was added to 250 ml of effluent (with 50% and 100% concentration) in laboratory conditions (adsorbent doses of 0.01, 0.05, 0.1, 0.5 and 1 g/l). Nitrate and phosphate concentrations in the effluent were measured before the experiment. According to the results, the highest amount of nitrate and phosphate removal at a dose of 0.5 g/l was selected as the optimal dose, so the nitrate and phosphate removal efficiency was decreased at concentrations higher than this amount, because the available active ingredient was reduced at doses higher than 0.5 g. In this experiment, the optimum contact time of the adsorbent with the contaminant was 45 minutes. It seems that modified nanosilica with mineral pumice has a high ability (86% efficiency) to remove nitrate and phosphate from aquaculture effluents and can be used to purify effluents from aquaculture farms before reuse in the return system or before entering to the environment.

Using social network as infrastructure to reduce the cost of IoT projects has its challenges as well as the benefits of this new design. This research provides a method for event detection / prediction system based on the proposed model, which has taken a closer look at this system than the previous research and has examined the conditions of using this system in various scenarios more carefully. Conditions such as network size, the time between two sampling of conditions and sending it to the data storage server, and the limitation of receiving data by common social networks’ APIs are some of the conditions that this research has addressed and the conditions for using social networks as storage and retrieval of generated data by the IoT projects. Obviously, the use of this infrastructure will have undesirable side effects. This study examines these effects and compromising between cost reduction and undesirable side effects. The results show that by using methods such as increasing multiple accounts and reducing the number of samples sent per second, the existing social network infrastructure can be used as the infrastructure of large IoT projects.

Gillnets are sometimes abandoned or lost at sea due to sea storms, tearing by a hard object, or the failure of fishermen to find the fishing area. In this study, the data related to the frequency of illegal abandoned fishing nets in Golestan province were collected through field patrols and questionnaire information from spring to winter 2016. 88,465 abandoned fishing nets were collected in the coastal waters of Golestan Province. The results showed that 78.2% of the discovered nets belonged to Caspian kutum, carp, and common roach, 10.4% of them belonged to sturgeon nets, and 11.4% belonged to beach seines and other fishing nets. Among the interviewed fishermen, 49.2% believed that 10-20% of the nets were lost at the sea, and about 6% believed that more than 40% of the nets were lost. In investigating the causes of losing fishing nets in seawater, 52% of the people believed that the nets were stolen. In other words, human factors are one of the main reasons for the loss of the nets. 25.2% of the people consider strong waves and 15.3% of the fishermen, tearing by boat fins, 6.3% of not being able to find the location of the net, and 1.2% of other factors such as rot of nets are considered to be the cause of the gill nets loss.

The study was performed on the shape and morphology of otolith Grammoplites suppositus (Troschel, 1840) in Bushehr and Hormozgan waters of the Persian Gulf. 157 specimens (86 from Hormozgan and 72 from Bushehr) were collected as trawl bycatch. All the specimens are killed and fixed in 70% alcohol. After obtaining otolith, its shape indices include: form factor, roundness, circularity, rectangularity, ellipticity, otolith size index, otolith longitude index were examined by Image Measurement software. Then all the measuring indexes were analyses by Univariate and Multivariate analysis. In the analysis of otolith shape of the two regions, a significant difference was observed in most of the studied parameters. Also, differential population analysis such as MANOVA / CVA showed the existence of two separate populations in the study areas.

As the complexity of the real-world problems increases, many of them can’t be modeled using current approaches. Therefore, to overcome the current challenges and deficits, new computational models should be constantly presented for solving mentioned problems. Many real-world problems are graph-like in nature, for which irregular cellular automaton (ICA) is a desirable tool. However, ICA is not able to represent the fuzzy concepts. To this end, in this paper, a new computational model called irregular fuzzy cellular automaton is proposed. To this end, the present paper introduces a new computational model, namely fuzzy irregular cellular automata. The proposed model is a combination of fuzzy cellular automata and irregular fuzzy cellular automata, with the aim to combine the advantages of the both models and to alleviate their disadvantages. The proposed model is then used for solving the real-world road safety ranking problem. The computer simulations are conducted to show the effectiveness of the proposed mode for rating different sections of roads. Experimental results showed that the proposed method could estimate the road safety problem with 75% accuracy.

The present study was conducted to evaluate the effects of nanosilver coating on the reduction of fouling fish cages of rainbow trout in the Ayush dam of Khorramabad from winter 2016 to autumn 2016. The nets were applied for antibacterial properties according to the exhaustion method The samples were collected from net panels (0.0625 m2) that were attached to the PVC frame, located at a depth of one meter from the side of the fish culture cages, and wet weight was measured, then it was identified with valid authentication keys. In this study, three genera of green algae and diatom were identified. The analyses showed that Do, temperature, and pH were positively and significantly correlated with Tetrasporaceae, wet weight and algae cover percentage. The Seasonal nanosilver panels treatment was free of fouling. Nanosilver coating can provide at least three months of effective protection against biofouling conditions. Nanosilver occupies the interstices of the polyamide polymer chain and interacts strongly with single pair electrons of nitrogen hence a coordinated complex is formed.

The non-standard size of the trawl fountain, especially in the bag section, increases the amount of incidental catch and non-target species caught. With the aim of standardizing the trawl springs in small floating vessels, trawl tours with 36, 40, and 44 mm fountains were used in Bushehr waters in 1396. The sampling site and sampling operations were carried out under similar conditions. And was carried out in three depth classes less than 10 meters, 10-20 meters, and 20-30 meters. At the end of the 9 trapping sequences, the species of whitefish (Metapenaeus affinis), green shrimp (Penaeus semisulcatus), shrimp (Parapenaeopsis stylifera), shrimp, or violin (Metapenaeopsis stridulans) and trachypenaeus granulosus Combined shrimp fishing. The tiger shrimp was the highest shrimp catch with 92.74%. The results also showed that depth and mean length of shrimp are significant. Also, in studying three sizes of fountains, the highest frequency of tiger shrimp was 7-10 cm. In the survey of catches, the highest catch of tiger shrimp in the 36mm fountain was found, with the highest amount of coding done on the tour. In the 36 mm range, the L50 was 5.92523 cm in the 36 mm trowel, the L50 was 6.58057 cm long and the length of 44 mm was LM50 7.233867 cm.

With regard to roads and traffic routes to different levels of risk, it can be determined which of these sections of these roads and paths are more likely to crash and based on this risk, the maximum speed and the various authorized routes As low as possible. In this study, using a fuzzy graph as a math model of the urban chip network, we present a method for determining the different areas of traffic in terms of the level of risk. Based on the probability of accidents, traffic areas fall into three low risk areas (green), in the danger zone (yellow) and high risk (red). In this study, a graph coloring method is presented that includes two automatic solitary and fuzzy logic segments. In this method, we perform the coloring of the existing graph using a fuzzy automaton system. In this study, the amount of α indicates the quality sensitivity of that road and it has been shown that increasing the amount of α will increase the number of most dangerous routes and increase the sensitivity to driving quality.

HER2-enriched subtype of breast cancer has a worse prognosis than luminal subtypes. Recently, the discovery of targeted therapies in other groups of breast cancer has increased patient survival. The aim of this study was to identify genes that affect the overall survival of this group of patients based on a systems biology approach.

Gene expression data and clinical information on 58 patients with HER2-enriched cancer were downloaded from The Cancer Genome Atlas (TCGA). Co-expression modules were identified using the weighted gene co-expression network analysis (WGCNA). The Cox regression was used to determine the modules that had a significant relationship with the overall survival (OS) endpoint. Single-gene survival analysis was performed within the selected module. Finally, functional annotation to explore the significance of genes was performed using the Database for Annotation, Visualization, and Integrated Discovery (DAVID).

Of the six identified co-expression modules, two had significantly poor prognoses. Single-gene survival analysis showed that 39% of genes in the selected modules were identified as significant. The genes were mainly related to the biological pathways such as Ubiquitin-mediated proteolysis and RNA degradation. CHAMP1, PPP1R26, PRRC2B, KANSL3, and ANAPC2 were identified as the 5 most important genes associated with reduced OS, in order of significance.

The systems biology approach can provide appropriate results relate to patient survival analysis. In this study, some genes were identified to be used as prognostic biomarkers in experimental studies related to the OS in the HER2-enriched subgroup. These genes can be considered potential candidates for therapeutic targets in this group of patients.

The diameter of the ring connected to the balustrade Conical Lift Net was initially 1.5 m. But gradually the diameter of the attached ring increased Today it is about 4 meters. The seems to increase the diameter of the ring This increased the number of non-target fish in this method. The purpose of this study was length frequency and species composition of non-target fish caught in Conical Lift NetMay 1997 in two fishing ports of Babolsar and Amirabad by four fishing vessels during 33 torrents at a depth of 40-50 m. After identifying the species caught, the total length and weight of the specimens were measured. From a the total of 193 fish caught, the highest and lowest percentage of total relative frequency fish species Alosa caspia were (37.8%)and Gasterosteus aculeatu (4.7%). Relative frequency of other species caught in Babolsar and Amirabad ports Syngnathus abaster were 38.8% and 28%, Gasterosteus aculeatu 50% and 0%, Mugilidae 11.11 and 18.2%, Alosa caspia 0% and 41.7%, respectively. Rutilus frisii kutum was 0% and 12%. The results also show that the frequency of fish caught in Amirabad fishing port is higher than Babolsar fishing port and strongly dependent on area (p < 0.01). The results indicate the high pressure resulting from the production of Bycatch fishing on non-commercial species in Amirabad fishing port. Most frequency in Babolsar and Amirabad fishery ports were respectively in the length class of 4.5-5.5 cm Gasterosteus aculeatu and length class of 15.5-5.5 cm Syngnathus abaster in fish.

One of the methods of standardization of gill nets is to determine the appropriate mesh size for each species. The purpose of this study was to determine. This study was aimed to determine the suitable mesh size of drift gillnets for catching skipjack (Katsuwonus pelamis).The sampling operation was carried out by the lange boat in the spring of 1397. The fishing tool consisted of drift gillnet for Skipjack tuna with a stretched mesh size of 160 mm. Fork length and body length were measured in two areas of skipjack tuna body. The total numbers of 394 specimens were measured, the fork length range was 38 to 77 cm with mean and standard deviation of 55.02 55 ± 5.90 cm. The highest frequency of Skipjack was in the range of 48-58 cm with 77%. The equations of linear relations between fork length and gill circumference: Gop = 0.577 FL + 1.866 with coefficient of determination 0.926 and linear relation for fork length and body circumference Gmax = 0.922 FL – 9.750 with a Coefficient of Determination 0.963 were gained. The elongation rate was 17% for gill circumference and 21% for the body circumference. In general, based on the present study, a drift gillnet with a mesh size of 136 mm can be used to capture Skipjack, which is slightly smaller than the minimum mesh size used by fishermen.

This study aimed to investigate the lenght frequency and species composition of fish caught in conical lift-netin May 2018 in two fishing ports of Babolsar and Amirabad by four fishing vessels during 33 torrents at a depth of 50-40 m. After identification, the total length and weight of the specimens were measured. Of the 27967 fish samples examined, the highest relative abundance belonged to Clupeonella caspia (98.98%) and the lowest one Gasterosteus aculeatu (0.032%). Number of fish caught in the Babolsar and Amirabad ports were 27610 and 357, respectively. Out of 193 fishes, the highest and lowest percentage of relative frequency fish specieswere for Alosa caspia (37.8%) for G. aculeatu (4.7%). The relative abundance of other species in the ports of Babolsar and Amirabad are Syngnathus caspius was 38.8 and 28%, G. aculeatu 50 and 0%, Mulets 11.11 and 18.2%, A. caspia 0 and 41.7%, Rutilus kutum 0% and 12%, respectively. The results show that the maximum and minimum frequencies in Babolsar port was 99.86% for Clupeonella caspia and 0.03% for C.engrauliformis and in Amirabad were 65.38% and 6.04%, respectively, for C. caspia and C.grimmi. Among the Kilka fish caught in the two zones, the abundance of C. caspia and C.engrauliformis were highly dependent on the fishing region (p < /em><0.01). The results show that maximum lenght abundance of conical lift net in Babolsar and Amirabad fishing ports are 11.5-12.5 cm.

The bony fish of the Caspian Sea are among the most important and most valuable fish in this sea, which unfortunately their reserves have been declining for many reasons in recent years. In this research, environmental factors were investigated on catching important bones such as white rutilus kutum (Kamensky, 1901), golden multitude of Chelon auratus (Risso, 1810) and Alosa saposchnikowii (Grimm, 1887). The catches were carried out by blade cooperatives on the Miankale Peninsula in Golestan Province during 73 times during the 1965-93 fishing season. In this research, 8914 whitefish, 4067 golden babies and 2335 piglets were biometric and weighed. The results showed that for goldfish with relevant data in model 5, it can be 50% for whitefish with the relevant data in model 3 can be 47% and for fish only one model with The very low coefficient of determination with a meaningful parameter yields quantities of catch per unit of effort. The results also showed that the effect of environmental parameters and spring on the average fish frequency per unit of effort was observed that the temperature factor, especially the increase of maximum temperature, was the most effect on the frequency of whitefish in the Caspian Sea, while increasing the humidity and precipitation on fish catch; Reducing the winds of the year will have the highest impact on the catching of wild boar and word. The highest catch per unit of effort was observed at 31 and 33 mm fountain.

Caspian sturgeon is one of the most important and economically valuable fish that unfortunately have witnessed a sharp decline in their natural stocks in recent decades, as they are on the endangered species list. Therefore, given the importance of sturgeon, identifying the factors that reduce their stockpiling is essential. The present study was applied in terms of purpose type and descriptive-analytical and survey method. The sample size was estimated based on Cochran formula of 270 fishermen by available and voluntary sampling method and the required information was collected by distributing questionnaires based on Likert spectrum and in-person interviews among fishermen in Golestan, Mazandaran and Guilan provinces. Questionnaire data analysis was performed using structural equations and PLS software and the findings indicated that factors such as overfishing, low release rate, illegal fishing, ؛ Inadequate fishing management ؛ Non-standard fishing gears and equipment had a significant and positive impact on the Reduction of sturgeon stocks , with the largest impact being illegal fishing. However, the effect of contaminant inflow and water pollution had a positive effect on the downward trend of sturgeon stocks, but was not significant. The findings of the present study can be of great help to fisheries decision makers in planning and Their implementing measures to restore sturgeon stocks their reserves and prevent their rapid decline and lead to improved sturgeon restoration efforts.

Yellowfin Tuna (Thunnus albacares) is one of the most important commercial and neritic fish species which has known because of ecological importance and wide distribution around the world. The aim of this study was to determine relative index of abundance for Yellowfin Tuna from 2007 to 2016, also we evaluated effect of some explanatory variables (year, month, vessel tonnage and net height) of catch per unit effort data in traditional gillnet fishery standardized by general linear model (GLM) in the Oman Sea. Standardized catch per unit effort is an important entrance in stock assessment as an annual abundance index. The results of this study have shown that all explanatory variables influence CPUE significantly in GLM model with lognormal error distribution; CPUE of Yellowfin Tuna increased 0.007 and0.0016 by raising one ton of vesselchr('39') tonnage and one meter of net height, respectively. Relative index of abundance of Yellowfin Tuna has the lowest quantity in 2011, remain stable till 2013 then increase to highest level in 2016, which is shown the catch rate can increase by raising catch effort. There is a seasonal trend in standard CPUE of Yellowfin Tuna with the highest catch rate in cold season. Monthly relative index of abundance has shown highest catch rate occurred in February and March.