Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea
The present study aimed to investigate the changes of bigeye kilka Clupeonella grimmi population caused by human and natural factors in southern waters of the Caspian Sea. This study was conducted in 2009 and 2010 during which Length, weight and age were studied. The annual survival rate, natural an...
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| Format: | Article |
| Language: | English |
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Universidad Estatal a Distancia (UNED)
2017-03-01
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| Series: | Cuadernos de investigación UNED |
| Subjects: | |
| Online Access: | https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1696 |
| _version_ | 1819155396012539904 |
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| author | Mehrdad Aliasghari |
| author_facet | Mehrdad Aliasghari |
| author_sort | Mehrdad Aliasghari |
| collection | DOAJ |
| description | The present study aimed to investigate the changes of bigeye kilka Clupeonella grimmi population caused by human and natural factors in southern waters of the Caspian Sea. This study was conducted in 2009 and 2010 during which Length, weight and age were studied. The annual survival rate, natural and fishing mortality in 2009 were estimated 0.305 yr-1, 0.448 yr-1 and 0.736 yr-1, and in 2010 were 0.309 yr-1, 0.419 yr-1 and 0.775 yr-1, respectively. Accordingly, total mortality in 2009 and 2010 was 1.184 yr-1 and 1.174 yr-1 and the exploitation rate was calculated 0.621 and 0.660, respectively. Bigeye kilka appropriated 4.5% and 4.2% of total kilka catch in Mazandaran Province in 2009 and 2010, respectively. Results showed that bigeye kilka catch amount has decreased and its population is under over-fishing and natural pressure. |
| first_indexed | 2024-12-22T15:36:18Z |
| format | Article |
| id | doaj.art-f42d8df16ba54399b6543847df425550 |
| institution | Directory Open Access Journal |
| issn | 1659-4266 1659-441X |
| language | English |
| last_indexed | 2024-12-22T15:36:18Z |
| publishDate | 2017-03-01 |
| publisher | Universidad Estatal a Distancia (UNED) |
| record_format | Article |
| series | Cuadernos de investigación UNED |
| spelling | doaj.art-f42d8df16ba54399b6543847df4255502022-12-21T18:21:15ZengUniversidad Estatal a Distancia (UNED)Cuadernos de investigación UNED1659-42661659-441X2017-03-019110.22458/urj.v9i1.1696Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian SeaMehrdad AliasghariThe present study aimed to investigate the changes of bigeye kilka Clupeonella grimmi population caused by human and natural factors in southern waters of the Caspian Sea. This study was conducted in 2009 and 2010 during which Length, weight and age were studied. The annual survival rate, natural and fishing mortality in 2009 were estimated 0.305 yr-1, 0.448 yr-1 and 0.736 yr-1, and in 2010 were 0.309 yr-1, 0.419 yr-1 and 0.775 yr-1, respectively. Accordingly, total mortality in 2009 and 2010 was 1.184 yr-1 and 1.174 yr-1 and the exploitation rate was calculated 0.621 and 0.660, respectively. Bigeye kilka appropriated 4.5% and 4.2% of total kilka catch in Mazandaran Province in 2009 and 2010, respectively. Results showed that bigeye kilka catch amount has decreased and its population is under over-fishing and natural pressure.https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1696Clupeonella grimmimortalitysurvival rateexploitation rate |
| spellingShingle | Mehrdad Aliasghari Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea Cuadernos de investigación UNED Clupeonella grimmi mortality survival rate exploitation rate |
| title | Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea |
| title_full | Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea |
| title_fullStr | Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea |
| title_full_unstemmed | Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea |
| title_short | Effects of fishing and natural parameters on big eye kilka Clupeonella grimmi (Clupeiformes: Clupeidae) population in southern waters of the Caspian Sea |
| title_sort | effects of fishing and natural parameters on big eye kilka clupeonella grimmi clupeiformes clupeidae population in southern waters of the caspian sea |
| topic | Clupeonella grimmi mortality survival rate exploitation rate |
| url | https://revistas.uned.ac.cr/index.php/cuadernos/article/view/1696 |
| work_keys_str_mv | AT mehrdadaliasghari effectsoffishingandnaturalparametersonbigeyekilkaclupeonellagrimmiclupeiformesclupeidaepopulationinsouthernwatersofthecaspiansea |