Investigation of trends in catch and growth patterns of Acipenser persicus Borodin, 1897 during three decades in the southern Caspian Sea | ||
| شیلات | ||
| Volume 76, Issue 4, December 2023, Pages 593-609 PDF (1.66 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22059/jfisheries.2023.356565.1373 | ||
| Authors | ||
| Shaghayegh Asgardoun1; Rahman Patimar* 2; Mohammad Gholizadeh2; Hadi Raeisi3; Seyyed Mostafa Aghilinezhad4; Amir Ali Moradinasab5 | ||
| 1PhD Student, Department of Fisheries, Faculty of Agriculture and Natural Resources, Gonbad Kavos University, Gonbad Kavos, Iran | ||
| 2Associate Professor, College of Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran | ||
| 3Assistant Professor, College of Natural Resources, Gonbad Kavous University, Gonbad Kavous, Iran | ||
| 4Ph. D in Fisheries, Management of Sturgeon Fishes Affairs, Holding of Agricultural Services, Gorgan, Iran | ||
| 5Ph. D in Fisheries, Hormozgan Fisheries Organization, Bandar Abbas, Iran | ||
| Abstract | ||
| The present study aimed to investigate variability in growth pattern and evaluate abundance of A. persicus based on catch data in the southern Caspian Sea water in a period of 27 years (1991-2018). The data of 72704 specimens were analyzed separately by sex (male, female and population), time (years) and region (coastal waters of Gilan, Mazandaran and Golestan provinces). The highest catch of this species was recorded in 1991 (6038 pieces of the fish) and the lowest catch was recorded in 2018 (292 pieces). During the period, the Golestan province had the highest number of catches (30851 pieces) and Gilan province had the lowest ones (11129 pieces). The maximum recorded fork length of this species was 240 cm in 2006. The results showed that the highest annual average fork length was 151 cm in 2007 and 2010 and the highest annual average total weight in 1993, 1994, 1996, 1997 and 2007, which was 26000 grams. The lowest annual average fork length was 139 cm in 2018 and the lowest annual average total weight was 600 grams in 2010 and 2012. The highest length frequency corresponded for the ranges of 136-148 and 148-160 cm in males and females, respectively. The females showed the highest catches in 1991, and the lowest in 2018, while the males had the highest in 1991, and the lowest in 2014. The females dominated the population in the period of 1991- 2013, and after that this ratio was reversed. The allometric coefficient of growth (b) varied between 1.03 and 3.49 in the study period. The growth pattern was mostly positive allometric in first decade of study (1991-2001), isometric or negative allometric in the second decade of study period (2001-2011), and negative in third decade (2011-2018). During the study period, the condition factor of the fish varied between 0.61 and 0.80, and the average of the factor for the whole period of study was 0.72. Generally, the catch of A. persicus in the southern Caspian waters decreased more than 95% from 1991 to 2018 (a period of 27 catch-years). | ||
| Keywords | ||
| Persian Sturgeon; Acipenser persicus; Catch; Growth pattern; Southern Caspian Sea basin | ||
| References | ||
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