000			02870nab a22003014ib4500
003			PH-QcNFR
005			20240621145619.0
008			240201c||||||||ph fr j o||||f0 a|eng|d
040			_aPH-QcNFR _beng _cPH-QcNFR
100	1		_aMarquez, Josefina R.S. _92837
245	1	0	_aAge and size at sexual maturity of white goby (Glossogobius Giurus), a common species of fish of Laguna de Bay with notes on its food habits / _cJosefina R.S. Marquez
264		1	_aQuezon City, Philippines : _bBureau of Fisheries and Aquatic Resources , _c1960
336			_atxt _btxt
337			_ac _bc
338			_acr _bcr
347			_atext file _bPDF
504			_aIncludes bibliographical references
520	3		_aThe pronounced depletion of the goby fishery of Laguna de Bay after 1950, probably resulting from the use of a non-selective fishing gear, the geket, initiated this study of the biyang puti (Glossogobius giurus). The analysis of the length frequencies of 3,768 specimens, the examination of the ovaries of 1,019 female specimens and the measurement of the diameters of 3,233 ova formed the bases for the determination of the age and size at first sexual maturity of this species, collected from the Cardona and Taguig areas of Laguna de Bay, from August 1958 to August 1959. The fish, on the average, matures at the end of its first year of life at size range 105-114.9 millimeters. The expanded or multiple spawning habit is characteristic of the species. However, maximum spawning activity takes place from June to August. Mature eggs measure from 0.55 to 0.83 mm. in diameter. Although the detailed study of the sexual maturity stages of the male biyang puti was not done, yet a close correlation with the maturity stages of corresponding female size groups was observed. It was found from the 161 stomachs examined that although biyang puti is predominantly a vegetarian, yet it also utilizes zooplankton foi'ms and other miscellaneous food items. Furthermore, it is at the same time a piscivore, feeding on its own kind. There is no significant variation in the kind of food items taken in by the different size groups. The presence of an unidentified fluke in the majority of the size ranges of fish examined suggests a case of parasitism which might be worthy of future study.
546			_aeng _beng
650		0	_aGobiidae _2LCSH _92997
650		0	_aGobiidae _zPhilippines _2LCSH _92996
650		0	_aFishing gear _2AGROVOC _93725
650		0	_aSpawning _2LCSH _93017
650		0	_aFishes _xSpawning _2LCSH _93505
773	0		_078 _9139 _aPhilippines. _oIRC00012 _tThe Philippine Journal of Fisheries _x2672-2836 (Online) _gVolume 8, Issue no. 1 ( 1960), page 71-100
856	7		_2https _uhttps://www.nfrdi.da.gov.ph/tpjf/vol8/AGE%20AND%20SIZE%20AT%20SEXUAL%20MATURITY%20OF%20WHITE%20GOBY%20(GLOSSOGOBIUS%20GIURUS).pdf _yOpen access
942			_2lcc _n0 _cJA _iIMC000059
999			_c795 _d795