Determination of Short Mackerel Rastrelliger brachysoma (Bleeker, 1851) Stocks in the Gulf of Thailand Using Otolith Microchemistry
ผู้เขียน :
SONTAYA KOOLKALYA
เผยแพร่วันที่ :
2 ก.ย. 2563
ประเภท :
บทความวิจัยที่ตีพิมพ์ในวารสารวิชาการระดับนานาชาติ
วารสารวิชาการ :
เล่มที่ :
33
ฉบับที่ :
1
หน้า :
249-257
ผู้เผยแพร่ :
Asian Fisheries society
รายละเอียด :
Abstract
The short mackerel Rastrelliger brachysoma (Bleeker, 1851) is a commercially important fish in the Gulf of Thailand
(GoT). The management strategy for this species in the entire GoT is based on the single-stock approach, which may
not be efficient or effective. This study aims to identify the stock structure of short mackerel in the GoT. A total of 55
samples of short mackerel were collected throughout the GoT, sexed, weighed and measured. The pair of sagittal
otoliths were removed from individual fish. The left sagittae were used for stock identification via microchemistry
elements. The microchemical composition of the otoliths from four locations (Eastern, Upper, Central and Lower GoT)
was different (MANOVA, P < 0.01) for both sexes. The linear discriminant function analysis (LDFA) using eight
microchemical elements in the edge zone showed high classification accuracy of short mackerel with regard to their
sampling location (89 % for males and 79 % for females). The LDFA results also showed high classification accuracy in
both sexes (more than 85 %) and indicated that there were four short mackerel stocks in the GoT. The right sagittae,
meanwhile, were used for fish ageing. Results showed that the adults had resided in the stock more than 50 % of their
life before being captured.
ลิงค์ :