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Nutritional behavior of Common Carp Cyprinus carpio Linnaeus, 1758 in Iranian waters of Caspian Sea
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Gholamali Bandani   , Mohammad Larijani , Keyvan Abbasi , Farhad Keymaram , Ahmad Reza Jabaleh * |
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Abstract: (4775 Views) |
| Common carp (C. carpio) is remarkable commercially in the southern Caspian Sea, especially in the southeastern coast. Its biology in natural environments has been less studied despite the commercial importance and value of this species. In this study, a total of 328 specimens were sampled and analyzed during the sampling period. The minimum and maximum length for females and males were 63 mm and 99 mm, 656 mm and 563 mm, respectively. The species included 11 age groups on the basis of biometric data and the autopsy. Analysis of fish feeding strategies and percentage of empty digestive tract in different seasons was conducted using the Costello (1990) graphical method. Out of the 328 fish which were examined, 235 empty stomachs and 66 stomachs containing food were observed. The Stomach emptiness percentage was variable between 69.72 to 75 % in which the maximum and minimum was reported for winter and spring, respectively. Feeding indexes including: probability percentage (Fi), frequency percentage (Ai) and dominance index (Ip) were examined in the digestive tract during different seasons. In all seasons, the highest digestive content was related to molluscs. The annelids presented the second highest content in the fish stomach in spring and plants indicated the highest content in fall and winter. The most reason for changing in the priorities of the food items during the period of study is the abundance of available food sources. In fact, C. carpio is an opportunistic and flexible feeder based on abundance and accessibility of foods. |
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| Keywords: C. carpio, Feeding behaviourr, Caspian Sea |
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Full-Text [PDF 459 kb]
(3076 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2015/12/21 | Accepted: 2016/02/28 | Published: 2017/12/21
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