Determination of short mackerel Rastrelliger brachysoma (Bleeker 1851) stocks in the Gulf of Thailand using otolith microchemistry

Koolkalya Sontaya, . and Trueman Clive, . and Sawusdee Amonsak, . and Jutagate Tuantong, . Determination of short mackerel Rastrelliger brachysoma (Bleeker 1851) stocks in the Gulf of Thailand using otolith microchemistry. pp. 249-257. ISSN 0116-6514

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.

Full text available from: Official URL: http://www.asianfisheriessociety.org/publication/d...

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.

[error in script]

Item Type:	Article
AGROVOC Term:	Rastrelliger brachysoma
AGROVOC Term:	Scombridae
AGROVOC Term:	Identification
AGROVOC Term:	Sampling
AGROVOC Term:	Age
AGROVOC Term:	Aging
AGROVOC Term:	Classification
AGROVOC Term:	Mass spectrometry
AGROVOC Term:	Multivariate analysis
AGROVOC Term:	Analysis of variance
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9280

Actions (login required)

View Item