000			03224nas|a2200397 i 4500
005			20260817163252.0
008			290500s1999 th uzm rtt 00| a1eng d
035			_a.b11790246
099		9	_aAIT Thesis no. AS-99-13
100	1		_aYadav, Choudhary Nagendra Roy
245	1	0	_aArtificial and semi-artificial propagation of Asian catfish,Heteropneustes fossilis (Bloch)
260			_aBangkok : _bAsian Institute of Technology, _c1999
300			_a68 leaves
490	1		_aThesis ; _vno. AS-99-13
500			_aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development
502			_aThesis (M.Sc.) - Asian Institute of Technology, 1999
520			_aAsian catfish, Singhi, Heteropneustes fossilis (Bloch) was spawned using artificial and semi-artificial breeding methods. Atiificial method involved hormonal inducement, stripping of eggs from females and fertilizing them with milt from sacrificed males. Semi-artificial method involved hormonal inducement only. Carp pituitary extract (CPE), HCG and GnRHa · implants were used in a single dose. Hormonal inducement was given only to females . Two trials resulted in no spawns. Hatching did not take place due to immature eggs. The artificial and semi-artificial propagation was successful in hatchery conditions for the first time in Nepal. Semi-artificial breeding method resulted in the highest number of fry (mean 250.53) (P<0.01). CPE resulted in the highest number of fry (mean 671) (P<0.01) in semi-artificial breeding method among all the three hormone treatments. This was followed by GnRHa implant producing fry with the mean value 419. These fish seem to be seasonal breeders. The latency period was 14 hours at 27-29°C in CPE and HCG treated females, and 21 hours in GnRHa treated females. The incubation period was 26 hours (27-29°C) in eggs from CPE and HCG treated females, and 20-24 hours in those from GnRHa treated females. Semi-artificial inducement using CPE or GnRHa is expected to be successful in hatchery propagation and commercial production of seed for individual fish farmers in the Nepalese context.
650	1	0	_aCatfishes
650	1	0	_aFish-culture
700	1		_aBart, Amrit N., _eChairperson
700	1		_aLin, C. K., _eExamination committee
700	1		_aMair, G.C., _eExamination Committee
710	2		_aHer Majesty Queen Sirikit Environmental Scholarships Program 1995-99 (Provided by Royal Thai Government), _eScholarship donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. AS-99-13
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B12655
907			_a.b11790246 _bmnait _cu
902			_a240330
998			_b0 _c000529 _dm _ea _fu _g0
945			_lmnait
945			_lmnarc
942			_c22
942			_c40
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