000			nam a22 7a 4500
999			_c9698 _d9698
003			OSt
005			20190127085854.0
008			181214b xxu||||| |||| 00| 0 eng d
040			_cNARA
100			_917955 _aJayamanne, S.C.
245			_aSize at Maturity and Apawning Periodicity of the Mud Crab scylla serrata (Forskal) in the Negombo Estuary
260			_c1993
300			_a141-152p.
440			_917956 _aJournal of National Science Council _nVol.21.No.1
505			_aSome aspects of reproductive biology of the mud crab; Scylla scrrntn in the Negombo estuary were studied by screening bi-weekly samples over a period of one year. The study revealed that the size of the female crab at first maturity was 12 cm and the estimated pre-spawning and post-spawning fecundities were around 3 and 1.5 million respectively. The ova mature at the size of about 300 /<m and are found in three batches indicating a partial spawning behaviour. Spawning occurs in two seasons, April and August. The sex ratio was uneven in most size groups and in most months of the year. About 85% of the commercial catches comprise immature females.
942			_cRP _2ddc