Study of some biological parameters of Tenualosa ilisha and gonad histological characteristics on spawning and post spawning
This research was conducted for studying of biological parameters of Tenualosa ilisha on spawning and post spawning time. For this reason, 60 fish were captured through three months, on September- fresh water (Karoon river in Khorramshahr) (1st station), September marine water (Hendijan coasts) (2nd station), October-marine water (3rd station) and November-marine water (4th station). Biological parameters, GSI and gonad histological study was performed. The results showed the highest total length, total weight and gonad weight were seen in fish were captured from 1st station which has a significant different with other fishes (p<0.05). Microscopic examination showed that 7 fishes were male and 53 were female. Samples of the 1st station were on stage 5 of gonad development and the main oocytes were post ovulated. Samples from other three stations were mainly on preliminary gonadal stages. In these ovaries, primary stages of yolk formation and nucleoli margination and development of yolk vesicles are obvious. Based on these results, Tenualosa ilisha is ready for spawning on September and this period is preferable for artificial propagation of this species.
| Main Authors: | , , , , |
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| Format: | article biblioteca |
| Language: | Persian |
| Published: |
2017
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| Subjects: | Biology, Iran, Khorramshahr, Karoon river, Species, Biological parameters, Gonad, Tenualosa ilisha, Spawning, Histological, Fresh waters, Marine water, Fish, |
| Online Access: | http://hdl.handle.net/1834/39429 |
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| Summary: | This research was conducted for studying of biological parameters of Tenualosa ilisha on spawning and post spawning time. For this reason, 60 fish were captured through three months, on September- fresh water (Karoon river in Khorramshahr) (1st station), September marine water (Hendijan coasts) (2nd station), October-marine water (3rd station) and November-marine water (4th station). Biological parameters, GSI and gonad histological study was performed. The results showed the highest total length, total weight and gonad weight were seen in fish were captured from 1st station which has a significant different with other fishes (p<0.05). Microscopic examination showed that 7 fishes were male and 53 were female. Samples of the 1st station were on stage 5 of gonad development and the main oocytes were post ovulated. Samples from other three stations were mainly on preliminary gonadal stages. In these ovaries, primary stages of yolk formation and nucleoli margination and development of yolk vesicles are obvious. Based on these results, Tenualosa ilisha is ready for spawning on September and this period is preferable for artificial propagation of this species. |
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