Gonadal recrudescence and induced spawning inBarbus altianalis

2013 ◽  
Vol 46 (3) ◽  
pp. 669-678 ◽  
Author(s):  
Justus Rutaisire ◽  
Berta Levavi-Sivan ◽  
Cassius Aruho ◽  
Constantine Chobet Ondhoro
Keyword(s):  
Induced Spawning ◽  
Gonadal Recrudescence

Induced spawning in the swamp eel (Monopterus albus) using human chorionic gonadotropine and artificial rain stimulation

2009 ◽  
Vol 153 (2) ◽  
pp. S143-S144
Author(s):  
Do Thi Thanh Huong ◽  
Nguyen A. Tuan ◽  
Nguyen K. Ha ◽  
Tobias Wang ◽  
Mark Bayley ◽  
...  
Keyword(s):  
Monopterus Albus ◽  
Induced Spawning ◽  
Artificial Rain ◽  
Swamp Eel

Steroid profiles during maturation and induced spawning of the striped mullet, Mugil cephalus L.

Aquaculture ◽  
1991 ◽  
Vol 95 (1-2) ◽  
pp. 149-168 ◽  
Author(s):  
Clyde S. Tamaru ◽  
Christopher D. Kelley ◽  
Cheng-Sheng Lee ◽  
Katsumi Aida ◽  
Isao Hanyu ◽  
...  
Keyword(s):  
Mugil Cephalus ◽  
Striped Mullet ◽  
Induced Spawning ◽  
Steroid Profiles

scholarly journals Seasonally sympatric but allochronic: differential expression of hypothalamic genes in a songbird during gonadal development

2018 ◽  
Vol 285 (1889) ◽  
pp. 20181735 ◽  
Author(s):  
Carolyn M. Bauer ◽  
Adam M. Fudickar ◽  
Skylar Anderson-Buckingham ◽  
Mikus Abolins-Abols ◽  
Jonathan W. Atwell ◽  
...  
Keyword(s):  
Gene Expression ◽  
Mrna Expression ◽  
Hormone Receptor ◽  
Gonadal Development ◽  
Luteinizing Hormone Receptor ◽  
Hpg Axis ◽  
Oestrogen Receptor Alpha ◽  
The Difference ◽  
Gonadal Recrudescence ◽  
Gonadotropin Inhibitory Hormone

Allochrony, the mismatch of reproductive schedules, is one mechanism that can mediate sympatric speciation and diversification. In songbirds, the transition into breeding condition and gonadal growth is regulated by the hypothalamic–pituitary–gonadal (HPG) axis at multiple levels. We investigated whether the difference in reproductive timing between two seasonally sympatric subspecies of dark-eyed juncos ( Junco hyemalis ) was related to gene expression along the HPG axis. During the sympatric pre-breeding stage, we measured hypothalamic and testicular mRNA expression of candidate genes via qPCR in captive male juncos. For hypothalamic mRNA, we found our earlier breeding subspecies had increased expression of gonadotropin-releasing hormone ( GnRH ) and decreased expression of androgen receptor, oestrogen receptor alpha and mineralocorticoid receptor ( MR ). Subspecies did not differ in expression of hypothalamic gonadotropin-inhibitory hormone ( GnIH ) and glucocorticoid receptor ( GR ). While our earlier breeding subspecies had higher mRNA expression of testicular GR , subspecies did not differ in testicular luteinizing hormone receptor, follicle-stimulating hormone receptor or MR mRNA expression levels. Our findings indicate increased GnRH production and decreased hypothalamic sensitivity to sex steroid negative feedback as factors promoting differences in the timing of gonadal recrudescence between recently diverged populations. Differential gene expression along the HPG axis may facilitate species diversification under seasonal sympatry.

Induced Spawning in the Indian Catfish

Science ◽  
1956 ◽  
Vol 123 (3207) ◽  
pp. 1080-1080 ◽  
Author(s):  
L. S. RAMASWAMI ◽  
B. I. SUNDARARAJ
Keyword(s):  
Induced Spawning ◽  
Indian Catfish
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