Survey on status of tunas in the Oman Sea (Sistan and Baluchestan Province)
This project was conducted in order to survey on status of stocks of tuna and determine some biometric parameters from industrial and artisanal fisheries in Oman Sea (Sistan and Baluchestan province) during April 1997 to March 2000. It was determined the spawning peaks of yellowfin and skipjack tuna on May- June and on May-June, Jan-Feb respectively, using the data collected from artisanal fisheries during these years. The first length at sexual maturity of females (Lm50%) come for yellowfin, skipjack and longtail tuna when they are 76cm,61cm and 72cm long respectively. Analysis of stomach contents showed that squid was the major components of diet for yellowfin and fish for skipjack, longtail tuna. A comparison of mean length from the same fisheries by two- way analysis of variance based on year and landing showed significant differences by year for yellowfin and skipjack tuna during April 1996 to March 2000. There are available the information on length-weight relationships of three species mentioned the above, as well as growth and mortality parameters of yellowfin and skipjack tuna. It was also determined the distribution of these species by spring, autumn and winter, using the data collected from artisanal fisheries during April. 1999 to March 2000. A comparison of the current distribution was very different with the previous studies in the year 1994-1995. In refer to an increased trend of CPUE of the sampled artisanal vessels (high capacity) in 1999 in comparison with the year 1997, it predicts greater use of the high capacity vessels to harvest more quantities of the resources, especially skipjack tuna. Based on a decreased trend of CPUE of purse seiners in local waters during the years 1996 to 2000, it recommends less activities of the vessels.
| Main Authors: | , , , |
|---|---|
| Format: | Report biblioteca |
| Language: | Persian |
| Published: |
Iranian Fisheries Science Research Institute
2002
|
| Subjects: | Survey, Tuna, Biometric parameters, Maturity, Longtail tuna, Skipjack tuna, CPUE, |
| Online Access: | http://hdl.handle.net/1834/14238 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This project was conducted in order to survey on status of stocks of tuna and determine some biometric parameters from industrial and artisanal fisheries in Oman Sea (Sistan and Baluchestan province) during April 1997 to March 2000. It was determined the spawning peaks of yellowfin and skipjack tuna on May- June and on May-June, Jan-Feb respectively, using the data collected from artisanal fisheries during these years. The first length at sexual maturity of females (Lm50%) come for yellowfin, skipjack and longtail tuna when they are 76cm,61cm and 72cm long respectively. Analysis of stomach contents showed that squid was the major components of diet for yellowfin and fish for skipjack, longtail tuna. A comparison of mean length from the same fisheries by two- way analysis of variance based on year and landing showed significant differences by year for yellowfin and skipjack tuna during April 1996 to March 2000. There are available the information on length-weight relationships of three species mentioned the above, as well as growth and mortality parameters of yellowfin and skipjack tuna. It was also determined the distribution of these species by spring, autumn and winter, using the data collected from artisanal fisheries during April. 1999 to March 2000. A comparison of the current distribution was very different with the previous studies in the year 1994-1995. In refer to an increased trend of CPUE of the sampled artisanal vessels (high capacity) in 1999 in comparison with the year 1997, it predicts greater use of the high capacity vessels to harvest more quantities of the resources, especially skipjack tuna. Based on a decreased trend of CPUE of purse seiners in local waters during the years 1996 to 2000, it recommends less activities of the vessels. |
|---|