Evaluation of the Diet of Juveniles Roach (Rutilus caspicus) in Earthen Ponds of Syjwal Bony Fish Breeding Center

Subject Areas : Journal of Animal Biology

Ahmadreza Jebeleh ¹ (1- Department of Aquatic Production and Exploitation, Faculty of Fisheries and Environment, University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran)
Rasoul Ghorbani ² (1- Department of Aquatic Production and Exploitation, Faculty of Fisheries and Environment, University of Agricultural Sciences and Natural Resources, Gorgan, Golestan, Iran)
Gholam Ali Bandani ³ (2- Inland Water Research Center, Agricultural Research Education and Extension Organization (AREEO), Iranian Fisheries Sciences Research Institute. Gorgan, Iran)
Sajjad Pourmozaffar ⁴ (3- Persian Gulf Mollusks Research Station, Agricultural Research Education and Extension Organization (AREEO), Persian Gulf and Oman Sea Ecological Research Institute, Bandar Lengeh, Iran)
Amir Eghbal Khajeh Rahimi ⁵ (4- Department of Fisheries, Islamic Azad University, North Tehran Branch. Tehran. Iran)
Saeid Tamadoni Jahromi ⁶ (5- Persian Gulf and Oman Sea Ecological Research Center, Agricultural Research Education and Extension Organization (AREEO), Iranian Fisheries Sciences Research Institute, Bandar Abbas, Iran.)
Mohsen Gozari ⁷ (5- Persian Gulf and Oman Sea Ecological Research Center, Agricultural Research Education and Extension Organization (AREEO), Iranian Fisheries Sciences Research Institute, Bandar Abbas, Iran.)

Received: 2019-11-11 Accepted : 2020-04-02 Published : 2020-06-20

Keywords: Diet, Gastropod, Rutilus caspicus, Earthen ponds, Syjwal,

Abstract :

This research was conducted to evaluate the diet of juvenile roach (Rutilus caspicus) stocked in earthen ponds and improve the pond conditions to increase the dominant organisms species. Four earthen ponds with the same hydrobiological properties were studied in the Syjwal bony fish farm. Sampling of the food organisms, measuring the weight and length of the juvenile roaches, and gut examination were carried out over a four-month period from March to June. The results indicated that the highest and the lowest condition factors (K) were 1.196 and 0.633, respectively; while the highest dominance index (Ip) was reported as 42.14 for Gastropoda and the lowest dominance index was reported as 2.4 for aquatic insects. The results of (Fp) analysis showed that the gastropoda and crayfish were mainly considered as the major preys, and organisms such as aquatic insects and bivalves were found as the minor foods in the Syjwal earthen ponds. Evaluation of the food preference (Fp)and the gut content of juvenile roaches in different stages indicate that the gastropoda show a higher food preference and feeding intensity than the other Foods.

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