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| 008 | 970205s1996 th uu m rtt 000 a1eng d | ||
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| 099 | 9 | _aAIT Thesis no.AE-96-27 | |
| 100 | 1 | _aWang, Weimin | |
| 245 | 1 | 0 | _aReproductive biology and artificial insemination of icefish (Neosalanx pseudotaihuensis) in the Xujiahe reservoir, Hubei, China |
| 260 |
_aBangkok : _bAsian Institute of Technology, _c1996 |
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| 300 | _a109 leaves | ||
| 490 | 1 |
_aThesis ; _vno. AE-96-27 |
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| 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, 1997 | ||
| 520 | _aSamples collected monthly from Xujiahe Reservoir from May 1995 to April 1996 have been used to elucidate various aspects of the reproductive biology of Neosalanx pseudotaihuensis in this reservoir. The gonads of N pseudotaihuensis started to develop rapidly in the early spring. Spawning was initiated in March, peaked in the mid-April and ended in May, and as the new generation enters the population, the old generation disappears. Fecundity ranged from 418 to 1370 with a mean of 950. The mature eggs are small, transparent and spherical and have a mean diameter of 0.59 mm. The larvae are characterized by an elongate, colorless and transparent body. The success of N pseudotaihuensis in Xujiahe Reservoir can be attributed in part to its production of very large numbers of eggs at a time when condi~ions in the reservoir are relatively stable. Comparisons between the reproductive biology of N pseudotaihuensis and that of other indigenous teleosts that spawn in Xujiahe Reservoir show that this species exhibits a wide range of reproductive strategies. A series of experiments to study the effect of post-death duration of broodfish of N pseudotaihuensis on fertility was carried out from December 1995 to May 1996 in Xujiahe Reservoir. Effects on fertility included: the post-death duration of female broodfish at insemination, the post-death duration of male broodfish, the post-death duration of both female and male broodfish and comparisons on viability of inseminated eggs and sperm kept between in natural conditions and in the ice vacuum jar. The fertility was completely lost after 240 minutes of the death of broodfish at the temperature of 10 0 c. The post-death duration of males effected more greatly than the post-death duration of females in fertility and there was a significant interaction between them. Sperm and eggs could be prolonged the viability and were able to fe1tilize after short-term conservation at low temperature ( 0 °q. Artificial insemination of N pseudotaihuensis should be conducted within 105 minutes after the death of broodfish. The egg and larval development was observed and described. The duration of egg 0 0 development was about 10 days at 10 ± 0.5 C and 7 days at 13 ± 0.5 C. N pseudotaihuensis hatched at mean body length of 2.7 mm, grew to 3.9 mm in a week and 5 .3 mm at two weeks. | ||
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_aFishes _xArtificial spawning _zChina _zHubei |
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| 700 | 1 |
_aYakupityage, Amararatne, _eChairperson |
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| 700 | 1 |
_aLittle, D. C. _eCo-Chairperson |
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| 700 | 1 |
_aLin, C. K., _eExamination committee |
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| 810 | 2 |
_aAsian Institute of Technology. _tThesis ; _vno. AE-96-27 |
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_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B14859 |
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