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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidad Estatal a Distancia
2017
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=515653587025 https://www.redalyc.org/journal/5156/515653587025/ https://www.redalyc.org/journal/5156/515653587025/html/ https://www.redalyc.org/journal/5156/515653587025/515653587025.epub https://www.redalyc.org/journal/5156/515653587025/movil |
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Sommario:
- Effects of fishing and natural factors on the population of the fish Clupeonella grimmi (Clupeiformes: Clupeidae) in southern waters of the Caspian Sea Mehrdad Aliasghari Hossein AnvariFar Javaid Iqbal Mir Multidisciplinaria (Ciencias Naturales y Exactas) mortality survival rate exploitation rate Clupeonella grimmi 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. 2017 artículo científico 1659-4266 https://www.redalyc.org/articulo.oa?id=515653587025 https://www.redalyc.org/journal/5156/515653587025/ https://www.redalyc.org/journal/5156/515653587025/html/ https://www.redalyc.org/journal/5156/515653587025/515653587025.epub https://www.redalyc.org/journal/5156/515653587025/movil en http://www.redalyc.org/revista.oa?id=5156 UNED Research Journal / Cuadernos de Investigación UNED application/pdf Universidad Estatal a Distancia UNED Research Journal / Cuadernos de Investigación UNED (Costa Rica) Num.1 Vol.9