000			nam a22 7a 4500
999			_c9478 _d9478
003			OSt
005			20181227092333.0
008			181214b xxu||||| |||| 00| 0 eng d
040			_cNARA
100			_917659 _aDayaratne P.
245			_aGill-net Selectivity for Amblygaster (= Sardinella) Sirm
260			_c1988, _aPhilippines, _bAsian Fishery Society,
300			_a71-82p.
440			_917700 _aAsian Fisheries Science _n; Vol.2
520			_aGill-net selectivity for Amblygaster (= Sardinella) sirm was studied using material collected from commercial fishing operations on the west coast of Sri Lanka during the period January-October 1985. Selectivity estimates were made by comparing fish caught by nets of different mesh sizes ranging from 2.5 cm to 3.8 cm and by using the- -fish length/girth relationship. The means of the selectivity factors estimated by the two methods were 5.53 and 5.48. These values are comparable with those obtained elsewhere for similar species. The optimal lengths and the selection factors estimated for different mesh sizes tended to increase with the mesh size. Also the large mesh size caught a greater size range of fish than the small meshes. The gill- net fisheiy effectively caught fish within the range 12.9-23.3 cm. The selection by all mesh sizes in general is towards the lower end of the selection range.
942			_cRP _2ddc