Haji Mohamed, Mohd Ibrahim (1987) Selectivity Studies On Malaysian Trawls. PhD thesis, Universiti Putra Malaysia.
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 .
|Item Type:||Thesis (PhD)|
|Subject:||Trawls and trawling - Malaysia|
|Chairman Supervisor:||Associate Professor Dr. Gunzo Kawamura|
|Call Number:||FPSS 1987 2|
|Faculty or Institute:||Faculty of Fisheries and Marine Science|
|Deposited By:||Mohd Nezeri Mohamad|
|Deposited On:||21 Jul 2011 10:50|
|Last Modified:||08 Sep 2011 16:51|
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