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:: Volume 1, Issue 3 (12-2013) ::
JAIR 2013, 1(3): 63-74 Back to browse issues page
The feeding strategy of the Caspian Seakutum (Rutilus frisii kutum Kamensky, 1901)
Mehdi Naderi Jolodar *, Gholamreza Salarvand, Asghar Abdoli, Hasan Fazli, Maesomeh Eshaqi Nimvaryy
Abstract:   (3563 Views)

This study aimed to identify the food items of Rutilus frisii kutum and the feeding intensity for this species was performed in the southern coast of the Caspian Sea.Sampling was carried out at 6 times from late March 2012 until late May 2013 in the distribution areas of kutum (less than 60 meter depths in the southern coast of the Caspian Sea) and 193 fish were studied for the contents of the digestive tract. The average total length and total weight of samples which were 36.9 ± 8.5 cm and 562.9±353.2 g, respectively. The results of this study showed that kutum are generally fed from Cerastorderma sp. and Balanus sp. as the presence frequency of Balanus sp. was more than Cerastorderma sp., but the amount of its consumption was less than Cerastorderma sp. In order of importance after the Bivalvia, Gastropoda, Crabs, Fish eggs, Filamentous algae were present in kutum GI. The feedingintensity and food strategy of this species are exposed to alter in term of gender, sampling periods and longitudinal length groups. Thus, the feedingintensity in males was more than females and the length groups in smaller than 30 cm was more than in higher length groups of 30 cm (P<0.05). Also the feeding intensity was shown in the different sampling periods as the reproductionperiods was drastically decreased with reducing temperature and in late winter. (P<0.05). At the recent survey, the results are indicated that the influence of adaptation and behavioral mechanisms, physiological and ecological, such as Bivalvia has a pivotal role for feeding of kutum, but the diversity amount on food consumption and feeding from Bivalvia were less than last years. If this species was surveyed in the southern coast of the Caspian Sea, it was appeared that this species was mostly fed on Cerastorderma sp., while it is recently demon strated the above prey was general food for kutum. It seems that releasing of fingerling kutum was mostly carried out by artificial propagation and its stock increasing was caused to decreasing frequency this food.

Keywords: Feeding strategy, Caspian Sea kutum, feeding intensity.
Full-Text [PDF 969 kb]   (1243 Downloads)    
Type of Study: Research | Subject: Special
Received: 2015/07/13 | Accepted: 2015/07/13 | Published: 2015/07/13
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Naderi Jolodar M, Salarvand G, Abdoli A, Fazli H, Eshaqi Nimvaryy M. The feeding strategy of the Caspian Seakutum (Rutilus frisii kutum Kamensky, 1901). JAIR. 2013; 1 (3) :63-74
URL: http://jair.gonbad.ac.ir/article-1-158-en.html

Volume 1, Issue 3 (12-2013) Back to browse issues page
نشریه علمی پژوهشی پژوهشهای ماهی شناسی کاربردی Journal of Applied Ichthyological Research
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