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IJFS 2018, 17 Back to browse issues page
Trophic level, food preference and feeding ecology of Rachycentron canadum (Linnaeus, 1766), in Hormuzgan Province waters (northern Persian Gulf and Oman Sea)
S. Behzadi , E. Kamrani * , F. Kaymaram , M.Sh. Ranjbar
, ezas47@gmail.com
Abstract:   (540 Views)
This study examined the ecological factors associated with feeding in Rachycentron canadum (cobia) in the waters of Persian Gulf and Oman Sea. Seasonally variation of stomach condition of cobia male, females, pooled and size wise were analyzed. In general, 577 cobia were collected (340 males, 237 females) (20–161 cm Total length) from Sept. 2014 to Sept. 2015 by the Ferdows-1 survey ship and from the landing areas in Bandar Abbas harbor seasonally. Our results provide the first estimates of trophic level (Tr.L) (4.32±0.76, mean±Se), consumption per biomass (Q/B) (6.13), and aspect ratio of the caudal fin (ARc.f) (3.1) for R. canadum in the Hormuzgan Province. We also found that bony fish made up more than 80 percent of the relative importance of particular prey (IRI %), indicating R. canadum primarily preys on these species. The immature group (20–40 cm,T.L), tended to feed on Penaeidae family, small crabs, and mollusks. Hierarchical clustering revealed that the frequencies of different types of prey could be applied to categorize the length classes into three levels. The result of this study revealed that the immature group and the 20-40 cm length class tended to feed on Penaeidae family, crabs, and mollusks. Also, we found that males generally fed more than females in all seasons and that R. canadum had an average dietary intake. The findings of this study can be used to prepare a food formulation for cobia that resembles the native diet.
Keywords: Rachycentron canadum, Feeding Ecology, Trophic level, Consumption per biomass Persian Gulf and Oman Sea
Full-Text [PDF 683 kb]   (193 Downloads)    
Type of Study: Orginal research papers |
Received: 2018/01/23 | Accepted: 2018/01/23 | Published: 2018/01/23
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Behzadi S, Kamrani E, Kaymaram F, Ranjbar M. Trophic level, food preference and feeding ecology of Rachycentron canadum (Linnaeus, 1766), in Hormuzgan Province waters (northern Persian Gulf and Oman Sea). IJFS. 2018; 17 (1) :179-193
URL: http://jifro.ir/article-1-3277-en.html


Volume 17, Issue 1 (1-2018) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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