Ovarian development and changes in the expression of pituitary gonadotropin subunits during the reproductive cycle of female Malaysian river catfish, Hemibagrus nemurus (Valenciennes, 1840), in captivity

2017 ◽  
Vol 33 (3) ◽  
pp. 429-436
Author(s):  
Z. Zulperi ◽  
A. Christianus ◽  
F. M. Yusoff ◽  
S. A. Harmin ◽  
M. Y. Ina-Salwany
Keyword(s):  
Reproductive Cycle ◽  
Ovarian Development ◽  
Pituitary Gonadotropin ◽  
In Captivity

Reproductive cycle and ovarian development of the marine ornamental shrimp Stenopus hispidus in captivity

Aquaculture ◽  
2010 ◽  
Vol 306 (1-4) ◽  
pp. 185-190 ◽  
Author(s):  
Rafael A. Gregati ◽  
Vivian Fransozo ◽  
Laura S. López-Greco ◽  
Maria Lucia Negreiros-Fransozo
Keyword(s):  
Reproductive Cycle ◽  
Ovarian Development ◽  
In Captivity

scholarly journals Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)

2013 ◽  
Vol 11 (4) ◽  
pp. 821-830 ◽  
Author(s):  
Thiago Scremin Boscolo Pereira ◽  
Renata Guimarães Moreira ◽  
Sergio Ricardo Batlouni
Keyword(s):  
Reproductive Cycle ◽  
Ovarian Development ◽  
Gonadosomatic Index ◽  
Ovarian Maturation ◽  
Invasive Fish ◽  
Multiple Spawning ◽  
Adult Females ◽  
The Mean ◽  
Ovulatory Follicles ◽  
Morphometric Evaluation

In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36) were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI) was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs) were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.

Changes in the expression of pituitary gonadotropin subunits during reproductive cycle of multiple spawning female chub mackerel Scomber japonicus

2011 ◽  
Vol 38 (3) ◽  
pp. 883-897 ◽  
Author(s):  
Mitsuo Nyuji ◽  
Sethu Selvaraj ◽  
Hajime Kitano ◽  
Hirofumi Ohga ◽  
Michio Yoneda ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Scomber Japonicus ◽  
Chub Mackerel ◽  
Multiple Spawning ◽  
Pituitary Gonadotropin

Seasonal reproductive cycle of the Galápagos tortoise (Geochelone nigra) in captivity

Zoo Biology ◽  
1998 ◽  
Vol 17 (6) ◽  
pp. 505-517 ◽  
Author(s):  
David C. Rostal ◽  
Todd R. Robeck ◽  
Janice S. Grumbles ◽  
Patrick M. Burchfield ◽  
David Wm. Owens
Keyword(s):  
Reproductive Cycle ◽  
In Captivity

Pituitary gonadotropin contents and ultrastructure of the gonadotrops in the African catfish Clarias gariepinus during the annual cycle in a natural habitat

1986 ◽  
Vol 64 (8) ◽  
pp. 1718-1726 ◽  
Author(s):  
J. Peute ◽  
M. A. Zandbergen ◽  
H. J. Th. Goos ◽  
R. de Leeuw ◽  
R. Pinkas ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Secretory Granules ◽  
Natural Habitat ◽  
Clarias Gariepinus ◽  
Early Spring ◽  
Late Winter ◽  
Breeding Period ◽  
African Catfish ◽  
Pituitary Gonadotropin ◽  
Gonadal Recrudescence

Over a period of 1 year, male and female specimens of a natural population of African catfish, Clarias gariepinus, were collected monthly at locations in northern Israel. Both the ultrastructural appearance of the gonadotrops and the pituitary gonadotropin content in males and females showed cyclical changes, which paralleled alterations in the reproductive cycle. In summer, during the breeding period, the gonadotrops were large and fully granulated, and pituitary gonadotropin reached maximum levels. After spawning, the resting period begins, with an increasing number of fusion products of secretory granules and globules in the gonadotrops, probably indicating a breakdown of hormone storage. This was followed by the appearance of residual bodies, cell shrinkage, and a considerable drop in pituitary gonadotropin content. In late winter and early spring, during gonadal recrudescence, the gonadotrops redeveloped, i.e., they increased in size and granulation, and at the same time the pituitary gonadotropin content augmented. This reproductive cycle will permit induced spawning and artificial propagation of African catfish from March till September. However, keeping the catfish at favourable feeding and temperature conditions may also permit the gonadotrops to produce gonadotropin continuously, thus providing the possibility of complete gametogenesis and of obtaining viable eggs and healthy larvae throughout the year.

scholarly journals Mobilization of energetic substrates in the endangered catfish Steindachneridion parahybae (Siluriformes: Pimelodidae): changes in annual reproductive cycle in captivity

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Carlos E. Tolussi ◽  
Aline D. Gomes ◽  
Cristiéle da S. Ribeiro ◽  
Danilo Caneppele ◽  
Renata G. Moreira ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Negative Correlation ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Annual Reproductive Cycle ◽  
Plasma Triglycerides ◽  
Glucose Levels ◽  
Adult Females ◽  
In Captivity ◽  
Continuous Feeding

ABSTRACT This study aimed at analyzing the energetic substrate (ES) in the main storage tissues of Steindachneridion parahybae, throughout the reproductive cycle in captivity. Differently from wild, in captivity, feeding is not interrupted during the reproductive period, the females do not spawn spontaneously, and they are sedentary. Adult females were sampled monthly and based on their histology and gonadosomatic index (GSI), ovaries were classified into: previtellogenic (PRV), vitellogenic (VTG), and regression (REG) stages. Ovaries at the VTG stage showed higher protein and lipids levels than at the PRV stage with a positive correlation between these substrates and the GSI. Muscle was the main source of proteins transferred to the ovaries, according to the negative correlation between these organs. Lipids remained unchanged in the liver, which is an important supplier in vitellogenesis, a pattern that probably occurs due to the continuous feeding. Muscular glycogen levels were higher at the VTG and REG than at the PRV stages. Plasma triglycerides were also higher during REG, while glucose levels were more elevated during the VTG stage. These results suggest that with constant food supply, the pattern of deposition of ES in S. parahybae is different from that described for other wild potamodromous species.

Reproduction of hatchery-produced meagre Argyrosomus regius in captivity I. Description of the annual reproductive cycle

Aquaculture ◽  
2013 ◽  
Vol 414-415 ◽  
pp. 309-317 ◽  
Author(s):  
Constantinos C. Mylonas ◽  
Nikolaos Mitrizakis ◽  
Maria Papadaki ◽  
Irini Sigelaki
Keyword(s):  
Reproductive Cycle ◽  
Annual Reproductive Cycle ◽  
Argyrosomus Regius ◽  
In Captivity
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