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Study of seasonal feeding habit in kutum (Rutilus frisii Nordmann, 1840) fingerling in seawaters of Guilan Province
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Alinaghi Sarpanah *    1, Keivan Abbasi1 , Sepideh Khatib1 , Siamak Bagheri1 , Yaghobali Zahmatkesh1 , Jalil Sabkara1 , Mehdi Moradi1 , Fariba Madadi1 |
| 1- Iranian Fisheries Sciences Research Institute, Agricultural Research, Education and Extension Organization |
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Abstract: (603 Views) |
About 30 species of commercial fish have been caught in the seawater of Guilan province annually and the most important species is Kutum (Rutilus frisii). The aim of this study was to determine the feeding indices, food spectrum, and dominant food items of fingerlings kutum under the investigation of feeding habits of kutum and grey mullets on the coasts of Guilan province. The fish were captured with a seine net with 6 mm mesh size from winter 2020 to autumn 2021 in the coastal areas of Talesh, Anzali, Kiashahr, and Chaboksar. The results on R. frisii with body weight 0.31-14.5 (3.64±2.8)g, total length 34.3-120 (68.3±19.0) mm and ages 0+ and 1+ years showed that the relative length of intestine is 0.59-1.16 (0.78±0.10). Vacuity index was calculated at 0, 0, 5, 0 and 1% in spring, summer, autumn, and winter seasons and the total of the year, respectively, and the mean fullness intensity was 372±267, 360±151, 230±173, 581±689 and 365±302 in spring until winter and total of the year, respectively, which showed significant differences (F=9.10, p<0.05). Detritus, filamentous algae, 26 genera of phytoplankton, 2 types of zooplankton and 13 types of benthic animals and as well as eggs and larvae of fish were observed in the gastrointestinal tract of kutum fingerlings with a frequency of presence 10, 73, 62, 5, 86 and 2 percent of all studied specimens, respectively. The phytoplanktonic genera of Cyclotella, Navicula and Nitzschia were observed in 60%, 52%, and 47% respectively, and gammaridae among the benthic animals had the most frequency in 68% of the fish. In general, according to the feeding indices, feed diversity, and dominance of feed items, kutum fingerlings are a benthic feeders and euryphagous with a good fullness intensity on Guilan coasts.
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| Keywords: Caspian Sea, Feeding intensity, Food spectrum, Feed dominance, Kutum |
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Full-Text [PDF 697 kb]
(806 Downloads)
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Type of Study: Research |
Subject:
بيولوژي آبزيان
Received: 2022/02/14 | Accepted: 2022/12/31 | Published: 2022/12/31
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Sarpanah A, Abbasi K, Khatib S, Bagheri S, Zahmatkesh Y, Sabkara J, et al . Study of seasonal feeding habit in kutum (Rutilus frisii Nordmann, 1840) fingerling in seawaters of Guilan Province. isfj 2022; 31 (5) :39-52 URL: http://isfj.ir/article-1-2581-en.html
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