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Study on population condition, gonadosomatic and hepatosomatic indices in three species of Alosa in the Southwestern coast of the Caspian Sea (Gilan provice)
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Hassan Taghavi *   , Maryam Mohammadpour , Mohammadrza Rahimibashar |
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Abstract: (2564 Views) |
In this study, hepatosomatic, gonadosomatic and condition of Alosa species were studied. A sampling were done from 5 stations (Rossdar, Clachay , Chaboksar, Chamkhala and Kiyoshahr) was arried out on the eastern coast of Gilan in 2016. A total of 693 sampling fish were collected. Samples were transferred to the laboratory in 10% formalin formaldehyde. Three species of Alosa namely Alosa.braschnikowi, A.caspia and A.Kessleri were identified, which were 354 samples (51.08%), 78 samples (25.3% 11%) and 261 individuals respectivetly (37.67%) were calculated.Fish were divide into 7 age classes (1 up to 7 years old), the highest percentage of A.braschnikowi population at age 3 (39.83%), A.caspia at age 4 (37.18%), and A.Kessleri species at age 4 (23 .40%). The highest mean (± standard error) in weight and length was observed in the A.braschnikowi species, which was 32.75 ± 05.027 grams and 38.39 ± 27.27 mm respectively. The lowest mean (± standard error) in weight and length was observed in A.caspia, which was 83.52 ± 53.13 and 11.32 ± 66.27 mm, respectively.In the three studied species of A.braschnikowi, A.caspia and A.Kessleri, the status index, gonadosomatic and hepatosomatic index (0.18 0.01, 0.12 ± 0.01 and 0.12, 0.01), (9.0 ± 0.04) 0.0 ± 0.06 and 0.77 ± 0/0) and (1.12 ± 0.0, 1.08 ± 0.04 and 1.2 ± 0.0), has no significant differences (p> 0.05). The sex ratio of the A.braschnikowi and A.Kessleri was 1: 1 (male: female), but in the A.caspia it was 1.33: 1.
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Article number: 2 |
| Keywords: Alosa braschnikowi, A.caspi, A.kessleri, Hepatosomatic, Gonadosomatic, Condition |
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Full-Text [PDF 981 kb]
(689 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2018/04/22 | Accepted: 2019/11/15 | Published: 2020/05/27
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