Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters
Sampling of longtail tuna (Thunnus longgol) wa conduced during each delivery of tuna catch to the tuna. canning Factory in Bandar-Abbas, Length frequency data was collected on a monthly basis. All individuals in the samples were examined for sex identification. The maturity stages for females were determined according to a 5 point scale.For the purpose the gonad index based on the weight of the fish was applied, most longtail tuna captured off the alost coast Iran principally from the Gulf of Oman arc considerably larger ranging from 75 to 80 Cm fork length. Fish below 55 Cm length were not represented in the samples. This results provide no modal progession for the monthly lenght frequency. Thy possible sourocs creating bias in the length distribution data such as migratory nature of longtail tuna and gear selectivity has been discussed. Thc study on the maturity magos reveals. that the spawning season for longtail tuna captured in Iran from the sea of Oman extraids from August through October. The possible multiple spawning season for this species has also been discussed.
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Format: | Journal Contribution biblioteca |
Language: | Persian |
Published: |
1993
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Subjects: | Thunnus longgol, Tuna, Longtail tuna, Delivery, Frequency, Spawning, Identification, Sex, Gonad, Length, |
Online Access: | http://hdl.handle.net/1834/12397 |
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dig-aquadocs-1834-123972021-05-19T06:44:36Z Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters Nikouyan, A. Firozi, A. Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length Sampling of longtail tuna (Thunnus longgol) wa conduced during each delivery of tuna catch to the tuna. canning Factory in Bandar-Abbas, Length frequency data was collected on a monthly basis. All individuals in the samples were examined for sex identification. The maturity stages for females were determined according to a 5 point scale.For the purpose the gonad index based on the weight of the fish was applied, most longtail tuna captured off the alost coast Iran principally from the Gulf of Oman arc considerably larger ranging from 75 to 80 Cm fork length. Fish below 55 Cm length were not represented in the samples. This results provide no modal progession for the monthly lenght frequency. Thy possible sourocs creating bias in the length distribution data such as migratory nature of longtail tuna and gear selectivity has been discussed. Thc study on the maturity magos reveals. that the spawning season for longtail tuna captured in Iran from the sea of Oman extraids from August through October. The possible multiple spawning season for this species has also been discussed. Published 2018-03-12T13:13:20Z 2018-03-12T13:13:20Z 1993 Journal Contribution Refereed 1026-1354 http://hdl.handle.net/1834/12397 fa http://isfj.areo.ir/ pp.69-82 Iran Oman Sea Bandar Abbas Gulf of Oman |
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Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length |
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Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length Nikouyan, A. Firozi, A. Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
description |
Sampling of longtail tuna (Thunnus longgol) wa conduced during each delivery of tuna catch to the tuna. canning Factory in Bandar-Abbas, Length frequency data was collected on a monthly basis. All individuals in the samples were examined for sex identification. The maturity stages for females were determined according to a 5 point scale.For the purpose the gonad index based on the weight of the fish was applied,
most longtail tuna captured off the alost coast Iran principally from the Gulf of Oman arc considerably larger ranging from 75 to 80 Cm fork length. Fish below 55 Cm length were not represented in the samples. This results provide no modal progession for the monthly lenght frequency. Thy possible sourocs creating bias in the length distribution data such as migratory nature of longtail tuna and gear selectivity has been discussed. Thc study on the maturity magos reveals. that the spawning season for longtail tuna captured in Iran from the sea of Oman extraids from August through October. The possible multiple spawning season for this species has also been discussed. |
format |
Journal Contribution |
topic_facet |
Thunnus longgol Tuna Longtail tuna Delivery Frequency Spawning Identification Sex Gonad Length |
author |
Nikouyan, A. Firozi, A. |
author_facet |
Nikouyan, A. Firozi, A. |
author_sort |
Nikouyan, A. |
title |
Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
title_short |
Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
title_full |
Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
title_fullStr |
Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
title_full_unstemmed |
Some observation on the length frequency distribution and gonad development of longtail Tuna in Iranian Waters |
title_sort |
some observation on the length frequency distribution and gonad development of longtail tuna in iranian waters |
publishDate |
1993 |
url |
http://hdl.handle.net/1834/12397 |
work_keys_str_mv |
AT nikouyana someobservationonthelengthfrequencydistributionandgonaddevelopmentoflongtailtunainiranianwaters AT firozia someobservationonthelengthfrequencydistributionandgonaddevelopmentoflongtailtunainiranianwaters |
_version_ |
1756076262522093568 |