Determination of short mackerel Rastrelliger brachysoma (Bleeker, 1851) stocks in the Gulf of Thailand using otolith microchemistry
Determination of short mackerel Rastrelliger brachysoma (Bleeker, 1851) stocks in the Gulf of Thailand using otolith microchemistry
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.
Linear discriminant function analysis, Microchemistry elements, Otolith
249-257
Koolkalya, Sontaya
4227c425-1b4f-4954-924a-5e55c988aeb3
Trueman, Clive
d00d3bd6-a47b-4d47-89ae-841c3d506205
Sawusdee, Amonsak
e6991a68-610c-4e2f-ae1d-ed3c62f20d49
Jutagate, Tuantong
64c5a276-7682-4bb5-ba5d-4a7e63c2c5b4
30 September 2020
Koolkalya, Sontaya
4227c425-1b4f-4954-924a-5e55c988aeb3
Trueman, Clive
d00d3bd6-a47b-4d47-89ae-841c3d506205
Sawusdee, Amonsak
e6991a68-610c-4e2f-ae1d-ed3c62f20d49
Jutagate, Tuantong
64c5a276-7682-4bb5-ba5d-4a7e63c2c5b4
Koolkalya, Sontaya, Trueman, Clive, Sawusdee, Amonsak and Jutagate, Tuantong
(2020)
Determination of short mackerel Rastrelliger brachysoma (Bleeker, 1851) stocks in the Gulf of Thailand using otolith microchemistry.
Asian Fisheries Science, 33 (3), .
(doi:10.33997/j.afs.2020.33.3.006).
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.
Text
Determination of Short Mackerel Rastrelliger brachysoma (Bleeker, 1851) Stocks in the Gulf of Thailand Using Otolith Microchemistry
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More information
Accepted/In Press date: 2 September 2020
Published date: 30 September 2020
Additional Information:
Funding Information:
The authors would like to thank the Royal Golden Jubilee Ph.D. Program of the Thailand Research Fund (PHD/0172/2554) for funding the first author’s Ph.D. study. We are also grateful to Dr. Andy J. Milton and Dr. Matthew Cooper, at the National Oceanography Centre, UK, for their kind assistance.
Publisher Copyright:
© Asian Fisheries Society.
Keywords:
Linear discriminant function analysis, Microchemistry elements, Otolith
Identifiers
Local EPrints ID: 445238
URI: http://eprints.soton.ac.uk/id/eprint/445238
ISSN: 0116-6514
PURE UUID: caa970eb-f356-40ee-bbd1-bcc3f8598107
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Date deposited: 26 Nov 2020 17:30
Last modified: 17 Mar 2024 02:58
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Author:
Sontaya Koolkalya
Author:
Amonsak Sawusdee
Author:
Tuantong Jutagate
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