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Showing 3 results for Population Dynamics
The Population dynamics of mud crab (Scylla serrata) in coast of Bandar Khamir (Hormozgan Province)
Alireza Salarzadeh, Fatemeh Rezvani,
Volume 6, Issue 2 (10-2016)
Abstract
The Sampling one-year period from October 92 to October 93 on a monthly basis was conducted using gillnets and baited traps. 70% of gillnet catches during flood tide consisted of adults. Sub-adults and juveniles were 28 % and 4.5%, respectively. Similarly, during ebb tide consisted of 51.7%, 24.2%, and 24.1%, respectively. It suggests that gillnets are not sized selective gear. In contrast, baited traps only caught adults and sub-adults with the percentage of 90.5% and 9.5%, respectively. The CW∞  and K of males were slightly higher than females namely 21.147 and 1.38 for males and 21.023 and 0.83 for females. The mortality estimates are as follows: natural mortality (M) male = 2.48 and fishing mortality (F) male =1.2, while M female =1.78 and F female = 0.75. The results show that S. serrata population is still less than underexploited.
Growth parameters and mortality of Sillago sihama, Forsskål, 1775 (Common silver-biddy) in the Hara Biospher Reserve, Iran
Seyed Hassan Hashemi, Mohsen Safaie, Ehsan Kamrani, Ali Salarpouri,
Volume 9, Issue 1 (6-2019)
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 (R2=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.


Spatio-temporal Variability of Some Population Dynamics Parameters of the Caspian kutum, Rutilus frisii (Nordmann, 1840) in the Coastal Waters of Golestan Province (Southeast Caspian Sea)
Amin Danaei, Rahman Patimar, Hadi Raeisi, Zia Kordjazi, Abdolazim Fazel,
Volume 14, Issue 4 (2-2025)
Abstract
This study aimed to investigate inter-population variation in the population dynamics of the Caspian kutum (Rutilus frisii) based on catch data from the coastal waters of Golestan Province (southeast Caspian Sea) over 26 years (1991-2016). The biometric data of 20,438 kutum samples were analyzed, with sizes ranging from 18 to 70 cm. The average values of L∞ and k were 59.83 cm and 0.44 per year, respectively. The weight infinity (W∞) ranged from 1,738.97 to 6,380.03 grams, with an average of 2,867.96 grams. Cohort analysis revealed five distinct cohorts in the exploited population. The natural mortality rates varied between 0.60 and 0.84, with an average total mortality (Z) of 1.35. The exploitation rate (E) ranged from 0.13 to 0.73, exceeding 0.5 in 8 years. The results indicate significant temporal variability in the kutum population over the study period.

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