A Study on Stock condition of cutlassfishes in Hormuzgan waters
Catlassfishes are one of valuable stocks in the Oman Sea and Persian Gulf that need enough knowledge of biological and environmental characteristics of provinces. Thus this project was performed. In this study, the stock condition of Catlassfishes was considered from March 2000 to September 2001 in the Sirik and Hengarn area. Sampling carried out seasonally with bottom trawl. Dominant species was Trichiurus lepturus. Anal length compared in the both Sirik and Hengam areas. The results showed a significant difference (P<0.05) between areas. Biomass and maximum CPUA were respectively estimated as 2856 tons and 3198 Kg/nm2 for Sirik area and 31 78 tons and 5204 kg/nm2 for Hengam area. IÄ and K were obtained i 15cm and 0.93, respectively. The instantaneous natural mortality co-efficient (M), Total mortality coefficient (Z) and exploitation ratio (E) was estimated as 3.65, It 15 and 0.65, respectively. Anal length per weight relationship obtained as 1 497X2*2849 2.2964 in Sirik and y=o.14649x in Hengam. This species seems to spawn throughout the year but two spawning peaks were determined in spring and Autumn. I-M50 was 27.5 cm. Female to male sex ratio was estimated 1.59 and showed a significant difference sexes. Minimum and maximum Fecundity were 2835 and 186000, respectively. Main food item was obtained sardine MSY values were estimated as 1642 and 1827 Ton for Sirik and Hengam respectively. Therefore, it is suggested that fishing should be done with care out of fishing season.
| Main Authors: | , , , , , |
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| Format: | Report biblioteca |
| Language: | Persian |
| Published: |
Iranian Fisheries Science Research Institute
2003
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| Subjects: | Trichiurus lepturus, CPUA, CPUE, Biomass, Growth parameters, Reproduction, Fecundity, Feeding, |
| Online Access: | http://hdl.handle.net/1834/14239 |
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| Summary: | Catlassfishes are one of valuable stocks in the Oman Sea and Persian Gulf that need enough knowledge of biological and environmental characteristics of provinces. Thus this project was performed. In this study, the stock condition of Catlassfishes was considered from March 2000 to September 2001 in the Sirik and Hengarn area. Sampling carried out seasonally with bottom trawl. Dominant species was Trichiurus lepturus. Anal length compared in the both Sirik and Hengam areas. The results showed a significant difference (P<0.05) between areas. Biomass and maximum CPUA were respectively estimated as 2856 tons and 3198 Kg/nm2 for Sirik area and 31 78 tons and 5204 kg/nm2 for Hengam area. IÄ and K were obtained i 15cm and 0.93, respectively. The instantaneous natural mortality co-efficient (M), Total mortality coefficient (Z) and exploitation ratio (E) was estimated as 3.65, It 15 and 0.65, respectively. Anal length per weight relationship obtained as 1 497X2*2849 2.2964 in Sirik and y=o.14649x in Hengam. This species seems to spawn throughout the year but two spawning peaks were determined in spring and Autumn. I-M50 was 27.5 cm. Female to male sex ratio was estimated 1.59 and showed a significant difference sexes. Minimum and maximum Fecundity were 2835 and 186000, respectively. Main food item was obtained sardine MSY values were estimated as 1642 and 1827 Ton for Sirik and Hengam respectively. Therefore, it is suggested that fishing should be done with care out of fishing season. |
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