Citation
Haji Mohamed, Mohd Ibrahim
(1987)
Selectivity Studies On Malaysian Trawls.
Doctoral thesis, Universiti Pertanian Malaysia.
Abstract
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 .
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