Social structure of shortspine spurdog (Squalus mitsukurii Jordan and Snyder, 1903): Case study from catch of bottom vertical longline operation along continental shelf of the Andaman Sea | โครงสร้างสังคมของปลาฉลามหลังหนาม (Squalus mitsukurii Jordan and Snyder, 1903): กรณีศึกษาจากผลจับโดยเบ็ดราวหน้าดินแนวตั้งบริเวณไหล่ทวีปอันดามัน
2008
Thanitha Thapanand-Chaidee(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Fisheries. Department of Fishery Biology) E-mail:[email protected] | Reangchai Sujittosakul(Department of Fisheries, Bangkok (Thailand). Marine Fisheries Research and Development Bureau. Deep Sea Fishery Technology Research and Development Institute) | Pirote Naimee(Department of Fisheries, Bangkok (Thailand). Marine Fisheries Research and Development Bureau. Deep Sea Fishery Technology Research and Development Institute) | Phithak Chaidee(Department of Fisheries, Bangkok (Thailand). Marine Fisheries Research and Development Bureau. Deep Sea Fishery Technology Research and Development Institute)
Study was conducted by MV. SEAFDEC 2 cruise no. 24-2/2004 during 15 to 31 March 2007 along Exclusive Economic Zone of the Andaman continental shelf in Thai Waters. The specimens were sampled by bottom vertical longline, using J and circle shape hooks randomly, in 20 surveyed stations. The catch composition of shortspine spurdog (Squalus mitsukurii Jordan and Snyder, 1903) was 33.09 percent by weight of total catch whereas its CPUE was 2.35 kg/100 hooks. The variation of catch was not correlated with water depth (100 to 200 m) and bottom temperature. However, shortspine spurdog could not be caught at the depth less than 90 m. Social structure of shortspine spurdog composed of females which significantly greater than the males.
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