| 000 | 03412cab a2200301Ia 45 0 | ||
|---|---|---|---|
| 001 | u187469 | ||
| 003 | SIRSI | ||
| 008 | 101202s2006 ua ss b eng d | ||
| 040 | _aEAL | ||
| 041 |
_aeng _bara |
||
| 090 | _aART MUJAS V31 NO5 17 | ||
| 100 | 1 | _aEI-Gamal, A. A. | |
| 240 | 1 | 0 |
_aMansoura University journal of agricultural sciences, 2006 v. 31 (5) _h[electronic resource]. |
| 245 | 1 | 0 |
_aInduced breeding of silver carp hypophthalmichthys molitrix (valenciennes) under the egyptian environmental conditions _h[electronic resource]. |
| 246 | 1 | 5 | _aاستحداث التبويض فى أسماك الكارب الفضى ( hypophthalmichthys molitrix ) تحت ظروف البيئة المصرية. |
| 300 | _ap.2787-2804. | ||
| 504 | _aIncludes references. | ||
| 520 | _aThe reproductive performance of 181 female silver carps Hypopthalmichthys molitrix (Valenciennes) was followed up during 8 months (March-October) in two successive years, 2004 and 2005 under the Egyptian environmental conditions. To study their reproductive performance, ovulation was stimulated in females with two doses of a carp pituitary powder (Argent, Philippines, Manila): a preparatory dose (0.3 mg/kg) followed by a resolving dose of 4.0 mg/kg body weight after 9 h, whilst males were stimulated with one single dose of 3 mg /kg. Females were stripped approximately 7-8 h after the second injection and eggs were immediately fertilized 'dry method'. Fertilized eggs were incubated in conical shaped fiberglass tanks supplied with aerated fresh flow-through water. An attempt was also carried out to outline the age at maturity in 214 females during 2005. The monthly trend of spawning traits in terms of percentage of ovulated females, egg weight in grams and as a percentage of female's body weight, number of seeds per kg/fish, percentage of fertilized eggs, larval survival rate and percentage of deformed larvae were estimated. Highest female response to induced breeding and better larval quality were obtainable from April to June. Females of silver carp attained sexual maturity at a body weight of less than 2 kg and an age of two years old or less. The lowest percentage of spawned fish was recorded in March (66.7and 50.0% in 2004 and 2005, respectively). During other experimental months percentage of ovulated females was in the range of 83.3 to 100%. The latency time was approximately 7.5 h at a temperature of 25.5ºC. Stripped eggs as a percentage of female body weight (ESI) ranged from 6.87 to 15.75%. Relative fecundity of females was in the range of 61,070 and 156.440 eggs/kg. Hatching occurred after approximately 20 hours at 25.5 ºC water temperature. Fertilization and survival rates ranged from 85.91 to 97.86% and 72.72 to 80.72%, respectively. The lowest percentages of deformed larvae (1112%) were observed during April-May compared with either that obtained during the early season (March: 15-20%) or at the late spawning season (July-October: 16-18%). | ||
| 546 | _aSummary in Arabic. | ||
| 650 | 0 |
_aSilver carp _xBreeding. |
|
| 650 | 0 |
_aSilver carp _xLarvae. |
|
| 650 | 0 |
_aFish ponds _xEnvironmental aspects. |
|
| 650 | 0 | _asexual maturity. | |
| 700 | 1 | _aAmer, M. Abdel-Baky | |
| 773 | 0 |
_tMansoura University Journal of Agricultural Sciences. _g2006.v.31(5) _x1110-0346 _7nnas _wu182197 |
|
| 856 | 4 | 0 |
_uhttp://nile.enal.sci.eg/EALE/2006/MUJAS/3106/5/2787.pdf _zFull text Article |
| 596 | _a1 | ||
| 942 |
_cAR _2lcc |
||
| 999 |
_c42436 _d42436 |
||