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Feeding indices of Planiliza abu (Heckel, 1843) in Karun River, Southwestern Iran | ||
| Caspian Journal of Environmental Sciences | ||
| دوره 20، شماره 4، دی 2022، صفحه 693-700 اصل مقاله (1.03 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22124/cjes.2022.5721 | ||
| نویسندگان | ||
| Miaad Jorfipour1؛ Yazdan Keivany* 1؛ Fatemeh Paykan-Heyrati1؛ Zaniar Ghafoori2 | ||
| 1Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran | ||
| 2Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj Campus, Iran | ||
| چکیده | ||
| The feeding characteristics of Planiliza abu in Karun River, Khuzestan Province, southwestern Iran were studied by collecting 460 specimens from November 2016 to September 2017. The specimens were anesthetized in 1% clove oil, fixed in 10% buffered formalin and transferred to the laboratory. The average length and weight of all specimens were 13.18 ± 1.35 cm and 31.05 ± 9.22 g, respectively. The average condition factor for both males and female was 1.34, exhibiting no significant differences in different months in both sexes (p > 0.05). The mean relative length of gut in all fish was 2.27 ± 0.36 during the year. The highest gastrosomatic index (GSI) value was in September (12.07), while the lowest in February and March displaying significant differences in different months (p < 0.05). A total of 214 empty stomachs were found amongst the 460 fish samples and there were no significant differences in the ratio of empty stomachs in different months (p > 0.05). Therefore, based on the visual observations, RLG and GSI, it could be concluded that this species is an omnivorous fish (mainly aquatic insects and plants, algae, diatoms, and detritus) with a modest feeding throughout the year. | ||
| کلیدواژه‌ها | ||
| Condition factor؛ Gastrosomatic index؛ Relative length of gut؛ Vacuity index | ||
| مراجع | ||
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