Selectivity Studies On Malaysian Trawls
A covered cod-end experiment was conducted employing 70 hauls of fish and shrimp trawls in the South China Sea and the Malacca Straits to determine the selectivity pattern of Malaysian trawls . This study was conducted in order to alleviate the intensive fishing effort on the fishery stocks esp...
| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1987
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| Online Access: | http://psasir.upm.edu.my/id/eprint/11749/ http://psasir.upm.edu.my/id/eprint/11749/1/FPSS_1987_2.pdf |
| _version_ | 1848841667713433600 |
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| author | Haji Mohamed, Mohd Ibrahim |
| author_facet | Haji Mohamed, Mohd Ibrahim |
| author_sort | Haji Mohamed, Mohd Ibrahim |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A covered cod-end experiment was conducted employing 70
hauls of fish and shrimp trawls in the South China Sea and the
Malacca Straits to determine the selectivity pattern of
Malaysian trawls . This study was conducted in order to
alleviate the intensive fishing effort on the fishery stocks
especially towards the juveniles of commercially important
species .
A mathematical model was developed to predict the
selection curve based on the standard length and maximum body
depth of fish and shrimp species retained by the net .collection in a selectivity experiment is now simplified to
obtaining the two parameters from fish or shrimp sampled from
any catch .
Results of the study revealed that the 25 mm cod-end fish
trawl retained 98 . 2 percent as compared to the 51 mm cod-end
which retained 56 . 1 percent of the catch . With the shrimp
trawl , the 25 mm cod-end retained 9 2 . 6 percent while the 38 mm
cod-end retained 5 1 . 35 percent of the catch . |
| first_indexed | 2025-11-15T07:46:53Z |
| format | Thesis |
| id | upm-11749 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:46:53Z |
| publishDate | 1987 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-117492024-06-26T00:33:00Z http://psasir.upm.edu.my/id/eprint/11749/ Selectivity Studies On Malaysian Trawls Haji Mohamed, Mohd Ibrahim A covered cod-end experiment was conducted employing 70 hauls of fish and shrimp trawls in the South China Sea and the Malacca Straits to determine the selectivity pattern of Malaysian trawls . This study was conducted in order to alleviate the intensive fishing effort on the fishery stocks especially towards the juveniles of commercially important species . A mathematical model was developed to predict the selection curve based on the standard length and maximum body depth of fish and shrimp species retained by the net .collection in a selectivity experiment is now simplified to obtaining the two parameters from fish or shrimp sampled from any catch . Results of the study revealed that the 25 mm cod-end fish trawl retained 98 . 2 percent as compared to the 51 mm cod-end which retained 56 . 1 percent of the catch . With the shrimp trawl , the 25 mm cod-end retained 9 2 . 6 percent while the 38 mm cod-end retained 5 1 . 35 percent of the catch . 1987-06 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/11749/1/FPSS_1987_2.pdf Haji Mohamed, Mohd Ibrahim (1987) Selectivity Studies On Malaysian Trawls. Doctoral thesis, Universiti Pertanian Malaysia. Trawls and trawling - Malaysia English |
| spellingShingle | Trawls and trawling - Malaysia Haji Mohamed, Mohd Ibrahim Selectivity Studies On Malaysian Trawls |
| title | Selectivity Studies On Malaysian Trawls |
| title_full | Selectivity Studies On Malaysian Trawls |
| title_fullStr | Selectivity Studies On Malaysian Trawls |
| title_full_unstemmed | Selectivity Studies On Malaysian Trawls |
| title_short | Selectivity Studies On Malaysian Trawls |
| title_sort | selectivity studies on malaysian trawls |
| topic | Trawls and trawling - Malaysia |
| url | http://psasir.upm.edu.my/id/eprint/11749/ http://psasir.upm.edu.my/id/eprint/11749/1/FPSS_1987_2.pdf |