Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf)
The biological aspects of Sepia pharaonis was studied during years 2006-07. The studied area restricted to the Bahrekan in Khouzestan province covering the depths of 2 up to 25m. The sampling methods were gillnet and bottom trawl. A total of 310 specimens collected, of which there wasn’t found any cuttlefish in the study area from July to October (5 months). The collected samples were transferred to the laboratory ashore for further biological measurements consist of: Mantle length, Body weight, sex determination. Gonado-Somatic Index, and determination of Spermatophoric Index, Spawning season, Food preference, Maturity stages and chemical analysis for food value determination. The results showed that the overall sex ratio is about M:F= 2:1 with percentage of 67.41% for males and 32.50% for females. Males are significantly bigger than females with average mantle length (ML) of 233.3 and 269.3 mm for female and male, respectively; with body weight of 1102.3 and 1450.6 g. The mantle length body weight relationship was found W=0.001 ML 2.540 (R2= 0.92) Female as: W= 0.0015 ML 4797 (R2= 0.93) male From point of feeding, the food preferences results indicated that fish is considered as main food, crabs as minor food and other marine organisms such as bivalvia and gastropods as random food. The highest vacuity Index (CV) and empty stomachs was determined for March-April and the lowest value was is December. Also, the maximum GSI was estimated for March-April months in which showing coherrances with the lowest food preference. The maximum spermatophoricfilaments were 856 and 45 for male pharaoh cuttlefish with mantle length of 300 and 185 mm, and on the other hand this values for fecundity were estimated 1589 and 53 for female specimens with 254 and 198 mm mantle length. The spawning season occurs in April- March in which accompany with migration of pharaoh cuttlefish towards shallow waters. The fishing season would be in this period in w.
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Format: | monograph biblioteca |
Language: | Persian |
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Iranian Fisheries Science Research Institute
2009
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Subjects: | Biology, Iran, Khouzestan province, Bahrekan, Sepia pharaonis, Gillnet, Sampling, Specimens, Weight, Sex, Gonado-somatic index, Spawning, Maturity, Female, Male, Bivalvia, Gastropods, |
Online Access: | http://hdl.handle.net/1834/39578 |
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dig-aquadocs-1834-395782021-07-16T02:17:48Z Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) Valinassab, Tooraj Kashi, M. Skandari, Gh. Mayahi, Y. Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods The biological aspects of Sepia pharaonis was studied during years 2006-07. The studied area restricted to the Bahrekan in Khouzestan province covering the depths of 2 up to 25m. The sampling methods were gillnet and bottom trawl. A total of 310 specimens collected, of which there wasn’t found any cuttlefish in the study area from July to October (5 months). The collected samples were transferred to the laboratory ashore for further biological measurements consist of: Mantle length, Body weight, sex determination. Gonado-Somatic Index, and determination of Spermatophoric Index, Spawning season, Food preference, Maturity stages and chemical analysis for food value determination. The results showed that the overall sex ratio is about M:F= 2:1 with percentage of 67.41% for males and 32.50% for females. Males are significantly bigger than females with average mantle length (ML) of 233.3 and 269.3 mm for female and male, respectively; with body weight of 1102.3 and 1450.6 g. The mantle length body weight relationship was found W=0.001 ML 2.540 (R2= 0.92) Female as: W= 0.0015 ML 4797 (R2= 0.93) male From point of feeding, the food preferences results indicated that fish is considered as main food, crabs as minor food and other marine organisms such as bivalvia and gastropods as random food. The highest vacuity Index (CV) and empty stomachs was determined for March-April and the lowest value was is December. Also, the maximum GSI was estimated for March-April months in which showing coherrances with the lowest food preference. The maximum spermatophoricfilaments were 856 and 45 for male pharaoh cuttlefish with mantle length of 300 and 185 mm, and on the other hand this values for fecundity were estimated 1589 and 53 for female specimens with 254 and 198 mm mantle length. The spawning season occurs in April- March in which accompany with migration of pharaoh cuttlefish towards shallow waters. The fishing season would be in this period in w. 2021-06-24T18:22:32Z 2021-06-24T18:22:32Z 2009 monograph 88.849 http://hdl.handle.net/1834/39578 fa http://www.ifro.ir/ application/pdf application/pdf 85 Iranian Fisheries Science Research Institute Tehran, Iran http://aquaticcommons.org/id/eprint/25182 18721 2018-09-03 17:06:03 25182 Iranian Fisheries Science Research Institute |
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Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods |
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Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods Valinassab, Tooraj Kashi, M. Skandari, Gh. Mayahi, Y. Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
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The biological aspects of Sepia pharaonis was studied during years 2006-07. The studied area restricted to the Bahrekan in Khouzestan province covering the depths of 2 up to 25m. The sampling methods were gillnet and bottom trawl. A total of 310 specimens collected, of which there wasn’t found any cuttlefish in the study area from July to October (5 months). The collected samples were transferred to the laboratory ashore for further biological measurements consist of: Mantle length, Body weight, sex determination. Gonado-Somatic Index, and determination of Spermatophoric Index, Spawning season, Food preference, Maturity stages and chemical analysis for food value determination. The results showed that the overall sex ratio is about M:F= 2:1 with percentage of 67.41% for males and 32.50% for females. Males are significantly bigger than females with average mantle length (ML) of 233.3 and 269.3 mm for female and male, respectively; with body weight of 1102.3 and 1450.6 g. The mantle length body weight relationship was found W=0.001 ML 2.540 (R2= 0.92) Female as: W= 0.0015 ML 4797 (R2= 0.93) male From point of feeding, the food preferences results indicated that fish is considered as main food, crabs as minor food and other marine organisms such as bivalvia and gastropods as random food. The highest vacuity Index (CV) and empty stomachs was determined for March-April and the lowest value was is December. Also, the maximum GSI was estimated for March-April months in which showing coherrances with the lowest food preference. The maximum spermatophoricfilaments were 856 and 45 for male pharaoh cuttlefish with mantle length of 300 and 185 mm, and on the other hand this values for fecundity were estimated 1589 and 53 for female specimens with 254 and 198 mm mantle length. The spawning season occurs in April- March in which accompany with migration of pharaoh cuttlefish towards shallow waters. The fishing season would be in this period in w. |
format |
monograph |
topic_facet |
Biology Iran Khouzestan province Bahrekan Sepia pharaonis Gillnet Sampling Specimens Weight Sex Gonado-somatic index Spawning Maturity Female Male Bivalvia Gastropods |
author |
Valinassab, Tooraj Kashi, M. Skandari, Gh. Mayahi, Y. |
author_facet |
Valinassab, Tooraj Kashi, M. Skandari, Gh. Mayahi, Y. |
author_sort |
Valinassab, Tooraj |
title |
Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
title_short |
Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
title_full |
Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
title_fullStr |
Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
title_full_unstemmed |
Biological aspects of Sepia pharaonis in the Bahrekan waters (NW Persian Gulf) |
title_sort |
biological aspects of sepia pharaonis in the bahrekan waters (nw persian gulf) |
publisher |
Iranian Fisheries Science Research Institute |
publishDate |
2009 |
url |
http://hdl.handle.net/1834/39578 |
work_keys_str_mv |
AT valinassabtooraj biologicalaspectsofsepiapharaonisinthebahrekanwatersnwpersiangulf AT kashim biologicalaspectsofsepiapharaonisinthebahrekanwatersnwpersiangulf AT skandarigh biologicalaspectsofsepiapharaonisinthebahrekanwatersnwpersiangulf AT mayahiy biologicalaspectsofsepiapharaonisinthebahrekanwatersnwpersiangulf |
_version_ |
1756079911495270400 |