Showing 9 results for Safaie
Mohsen Safaie, Mohammad Momeni,
Volume 5, Issue 1 (ُSummer 2015)
Abstract
This study was conducted to determine the virtual population analysis, recruitment pattern and cohort analysis of blue swimming crab (Portunus segnis) in coastal waters of the Persian Gulf and the Oman Sea (Hormozgan province). Sampling was carried out monthly by bottom trawl from May 2010 to October 2011. Results of Thompson and Bell prediction analysis showed that the maximum sustainable yield (MSY) was 302.2 tons, total survival biomass was 131.6 and maximum economic yield (MEY) was $625.3. A 10 % decrease in the level of fishing effort is recommended to ensure sustainability of the blue swimming crab stock.Maximum of recruitment pattern was in October (age of recruit 0.5 Y-1) with average carapace width of 91 and 110 mm for female and male respectively. Three cohorts were distinguished based on Bhattacharya's method for both sex of blue swimming crab.
Mohsen Safaie, Mozhgan Shariat,
Volume 6, Issue 2 (Autumn 2016)
Abstract
Feeding habits of the blue swimming crab, Portunus segnis were studied in the coastal waters of Chabahar (Oman Sea) during the period from January 2015 to June 2015. The stomach contents of 623 crabs (included 138 males and 125 females) were analyzed. Their contents appeared to consist of mainly large quantities fish (48.2 %), crustaceans (19 %) and molluscs (15.7 %), also small quantities of seagrass (3.3 %), mixed matter (8.8 %), unidentifiable matter (5 %) and debris. The C.V. index was 44.8 %, also the crabs in the warm season most voracious (CV=38.9 %) than in cold season (CV=51.1 %). The crabs without barnacle comparatively voracious with barnacle-carrying crabs (p<0.05). There was no difference observed in the quantity of the food consumed in both sexes and also significant differences observed in the preference for food items in the different size groups. Based on the major food items were observed in different size groups, the crustaceans, fish, and molluscs were the most dominant in juvenile crabs and the fish items were the most dominant (with 62 %) in adult and larger size groups crabs.
Peimaneh Kadkhodafatehabadi, Mohsen Safaie, Mohammad Sharif Ranjbar,
Volume 7, Issue 1 (Summer 2017)
Abstract
This study was conducted to identify the intertidal crab species and their temporal distribution caught by set net in northwest of the Qeshm Island. A total of 120 crabs were collected monthly from February 2015 to January 2016. The specimens were collected by hand and then fixed in formaldehyde 10%, transported to the laboratory and then identified based on their morphological characteristics using identification keys. The results showed that the specimens belong to 3 families including Portunidae, Macrophthalmidae and Pilumnidae. Portunus segnis and Venitus dentipes were dominant species in set net in northwest of the Qeshm Island whereas, Eurycarcinus orientalis was observed in some months in the study period. Temporal distribution and frequency of species was different in overall year, so that the frequency of crabs in warm seasons (spring and summer) was higher than than in cold season (winter).
Maryam Bahremand, Mohsen Safaie, Mohammad Momeni,
Volume 7, Issue 4 (Spring 2018)
Abstract
This study was conducted to determine some aspects of reproductive biology of the Indo-Pacific swimming crab, Charybdis hellerii (A. Milne-Edwards, 1867) in coastal waters of the Persian Gulf (Hormozgan province) from June 2015 to May 2016. The results showed that the annual sex ratio is F: M=1:1.3, with 57.4 % males. All the five stages of ovarian development of C. hellerii were observed throughout the year. This crab can spawn all year round with a spawning peak in spring season (From February to July). The fecundity of ovigerous crabs with a carapace width of 41-65 mm ranged from 107040 to 2560065 eggs, with average of 779325 eggs. The minimum carapace width (CW) of female crabs in sexual maturity age was 38 mm and the CW of female in a length of 50% of all ovigerous females (LM 50) was 54.55 mm.
Seyed Hassan Hashemi, Mohsen Safaie, Ehsan Kamrani, Ali Salarpouri,
Volume 9, Issue 1 (Summer 2019)
Abstract
Population parameters of Silver sillago (
Sillago sihama) were studied in Hara Biosphere Reserve in Hormozgan province in the south of Iran from September 2016 to August 2017. All specimens were sampled by boat trawl, beach seine, and trapping barriers. Growth parameters were determined using the monthly length-frequency data. The range of total length was between 5.2 to 22.4 cm, and the mean total length was calculated 13.5±0.10 cm for Common silver-biddy. Using length-frequency data analysis, the value of L∞ and K were calculated 30 cm and 0.43 yr
-1, respectively. The growth function ø' was calculated as 2.59. Based on growth parameters and monthly length-frequency analysis, four cohorts were distinguished for Common silver-biddy. The rate of natural mortality (M), total mortality (Z), and exploitation rate (E) were estimated at 1.03 yr
-1, 2.74 yr
-1, and 0.63, respectively. The length-weight relationship was determined as W= 0.0076 L
2.975 (R
2=0.9065), indicating algometric growth for Silver sillago. The results showed that the majority of studied fish were juvenile fish. This demonstrates the supporting role of creeks for Sillaginidae as a nursery ground.
Faezeh Izadifar, Mohsen Safaie, , , , ,
Volume 10, Issue 1 (Summer 2020)
Abstract
The population parameters of G. suppositus were studied for a period of 18 months from November 2016 to April 2018 in the coastal waters of the Persian Gulf (Hormozgan province). A total of 635 fish were selected as bycatch from shrimp bottom trawler and measured biometric data. The correlation between total length and weight for males and females showed high values (R2 were estimated at 0.83 and 0.86 for males and females, respectively. The b-value for the length-weight relationship was 3.35 and 3.21 for males and females, respectively, indicating positive allometric growth patterns in this species (P <0.05). The TL∞ was estimated at 35 cm for males and 40 cm for females as well as the growth coefficient (K) for males and females was estimated at 0.74 and 0.65 Y-1, respectively. Also, t0 for males and females were estimated at -0.20 and -0.22 Y-1, respectively. The recorded results of this study showed that the natural mortality rate (M) in males was 1.38 Y-1and for females were 1.22 Y-1and the fishing mortality rate (F) was 2.95 in males and 3.05 Y-1 in females, respectively. The total mortality (Z) for males and females was estimated at 4.33 and 4.27 Y-1, respectively. Also, the exploitation coefficient (E) for this species was 0.68 and 0.71 in males and females, respectively.
Asieh Soleimanirad, Dr Mohammad Reza Taherizadeh, Dr Mohsen Safaie, Dr Narges Amrollahi Biuki,
Volume 11, Issue 4 (ُُSpring 2022)
Abstract
Sediment samples were collected from 8 sites in the northern areas of Qeshm Island, Iran to determine the total and partial concentrations of heavy metals including copper (Cu), lead (Pb), nickel (Ni), cadmium (Cd), and Iron (Fe), in February 2016. A combination of nitric acid and perchloric acid was used to determine the total concentrations and sequential extraction method was used to analyze the partial concentrations of different geochemical parts of the sediment. Metal concentrations were measured by flame atomic absorption spectrometry. Contamination factor (CF), pollution load indices (PLI), enrichment factor (EF), geoaccumulation index (Igeo), risk assessment code (RAC) and potential ecological risk (PER) were calculated to determine the ecological risk. The results showed that the concentrations of heavy metals were Fe>Ni>Pb>Cu>Cd, respectively. The results of sequential extraction showed that Cd (25.98%) and Cu (21.40%) had the highest bioavailability among the other heavy metals. Most of each element was in the part of reducible (Fe-Mn oxide bound) (F3) and residual (F5). According to the RAC, only Cu and Cd were identified as high-risk at Station 5, and for other stations and other metals, the results showed low, medium or no risk. Evaluation of enrichment factor showed significant contamination for most of the metals tested, including Cd, Ni and Pb, which confirms the results from other indices. Finally, it can be said that the results of various indices that have been measured in relation to the mentioned heavy metals, showed that these elements have low to moderate pollution in the study area.
Mohsen Safaie, , , , ,
Volume 12, Issue 2 (Summer 2022)
Abstract
In this study, some reproductive characteristics of the yellow gooseberry, Upeneus doriae were investigated in Bandar Abbas coastal waters for a period of 8 months from July 2018 to February 2019. 300 fish specimens were selected from the bycatch fish of shrimp trawl. The samples were then transferred to the laboratory and the biometric data and some aspects of the biology of the fish were recorded. The results showed that male fish were more prevalent (53.3%) than females in trawl catch during the study period. The male: female sex ratio was significantly different in each month and in the whole period of study. According to the results of this study, it is expected that the spawning of this species begins in January. The fork length in which 50% of females reach sexual maturity is 10.6 cm.
Razieh Faghirdoost, Mohsen Safaie, Adnan Shahdadi,
Volume 14, Issue 4 (winter 2025)
Abstract
This study examined the species composition of true crabs caught in stake nets (moshta) located in the intertidal area of Bandar Abbas over the course of one year, from January 2023 to January 2024. Monthly sampling was conducted at three moshta locations: Soro, Khaja Ata, and Nakhal Nakhoda along the Bandar Abbas coast. Crabs were identified based on their external morphological features, and biometric data, including the carapace length and width and the weight of the specimens, were recorded. During the study period, four crab species from two families, Portunidae and Matutidae, were identified. The Portunidae family included Portunus segnis, P. sanguinolentus, and Charybdis annulata, while the Matutidae family contained only Matuta planipes. The catch composition revealed that P. segnis was the most dominant species, accounting for 79.4% of the total catch, followed by P. sanguinolentus (19.4%), C. annulata (0.7%), and M. planipes (0.4%). Analysis of monthly and seasonal catch data showed that P. segnis exhibited significant abundance throughout the year at all three sampling locations. P. sanguinolentus was most abundant in the Nakhal Nakhoda region, particularly during the second half of the year (October to March), and was observed occasionally in the Khaja Ata region during spring, autumn, and between April to June and October. It was not observed in the Soro region. Other species, including C. annulata and M. planipes, were found sporadically in some months of the year, exclusively in the Nakhal Nakhoda area. The carapace width of male and female P. segnis crabs differed during the study, with male crabs ranging from 21 to 149 mm (average 81.33 ± 2.29 mm) and female crabs ranging from 23 to 124 mm (average 88.45 ± 2.47 mm).
