Hormone Profiles of Captive Striped Bass <i>Morone saxatilis</i> During Spermiation, and Long‐Term Enhancement of Milt Production

Mylonas, Constantinos C.; Zohar, Yonathan; Woods, L. Curry; Thomas, Peter; Schulz, Rüdiger

doi:10.1111/j.1749-7345.1998.tb00662.x

Cited by 34 publications

(13 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, we found that P increased progressively as maturation progresses in female and was found to be the maximum during ripe stage, which is indicated in histological slide of ripe ovary as shifting of nucleus towards animal pole similarly. The synthesis of male hormones occurs in Leydig cell and the major androgens produced by testicular tissue are T, 11-Ketotestosterone (11-KT) and androstenedione (Mylonas et al 1998). The T has an effect on spermatogenesis such as spermatogonial multiplication and spermatocyte formation (Billard et al 1982).…”

Section: Discussionmentioning

confidence: 99%

Gonadal development and steroid hormone profile of wild caught grey mullet (Mugil cephalus)

Kumar

Arasu

Kailasam

et al. 2015

Biological Rhythm Research

View full text Add to dashboard Cite

The grey mullet Mugil cephalus is one of the popular and fast growing fishes being cultured in tropical and subtropical regions. In the present study, histological observation of gonadal development and corresponding changes in sex steroid levels from different maturity stages of wild caught male and female were studied. In female, testosterone and 17β-estradiol increased with the advancement of maturation and reached peak (17β-estradiol, 323 ± 13 pg/ml; testosterone, 938 ± 7.87 pg/ml) in mature stage, whereas the level of progesterone was maximum (488 ± 4.9 pg/ml) during ripe stage. Vitellogenin level in serum showed a similar trend as 17β-estradiol. In case of male, the testosterone level in serum increased gradually with advancement of maturation and was maximum (1820 ± 40.25 pg/ml) during ripe stage, whereas significant decrease in 17β-estradiol and progesterone was noticed with advancement of maturation. The fundamental information from this investigation would be useful for developing protocol for accelerating maturation and spawning under captive condition.

show abstract

Section: Discussionmentioning

confidence: 99%

Gonadal development and steroid hormone profile of wild caught grey mullet (Mugil cephalus)

Kumar

Arasu

Kailasam

et al. 2015

Biological Rhythm Research

View full text Add to dashboard Cite

show abstract

“…In the following figures it can be observed that these treatments can cause multiple spawning in females ( Figure 2) and extend the reproductive season in males, without affecting sperm quality (Figures 3, 4, and 5). In fact, GnRH probably stimulates also the release of other pituitary hormones involved in the reproductive cycle, like Growth Hormone (GH), Thyroid Stimulating Hormone (TSH) and Somatolactine (Mylonas et al, 1998). The action of GnRHa takes place at a higher level of the animal endocrine pathway, stimulating the reproductive events in a more balanced and integrated way, with the other physiological functions correlated to the reproduction cycle .…”

Section: Hormonal Treatments Of Broodstockmentioning

confidence: 99%

The control of reproduction in finfish species through GnRH treatments

Rainis

Ballestrazzi

2005

Italian Journal of Animal Science

View full text Add to dashboard Cite

Fish in captivity can show some dysfunctions, at different levels, in the physiological processes of reproduction, due to

the lack of synthesis or release of gonadotropins (GtHs) by hypophysis. As a consequence, a worsening of quality and

quantity of spawned gametes, or a lack of egg and sperm spawning, can be observed. The farmers can act on fish repro-

ductive cycle manipulating the environmental parameters of rearing, the diet, the genetics or using GnRH treatments.

Nowadays, they are used mainly GnRH, synthesized in laboratory as analogues. These releasing factors, naturally pro-

duced by hypothalamus, let to overcome the technological and biological limits of the “traditional” hormonal treatments

with hCG, being more effective, cheaper and easily available on market. This article makes a historical survey of the con-

ditioning treatments for fish reproduction and also considers the future perspectives of these treatments, examining the

topics that research will have to focus, in order to make these treatments common worldwide, in any hatchery and for

each farmed species of finfish.

show abstract

“…Treatment with exogenous hormones can stimulate the release of ¢sh endogenous LH and accelerate gonadal development and maturation (Khan, Hawkins & Thomas 1999;Komatsu, Bhandari, Kobayashi, Nakamura & Nakamura 2006). Further studies showed that GnRHa multiple injection or the use of sustained-release GnRHa delivery systems can maintain a long-term stimulation of LH secretion, which mediated the testicular development and ¢nal maturation through elevated steroid levels (Mylonas, Gissis, Magnus & Zohar 1997;Mylonas, Zohar,Woods, Thomas & Schulz 1998;Mylonas & Zohar 2001;Mylonas et al 2010). Further studies showed that GnRHa multiple injection or the use of sustained-release GnRHa delivery systems can maintain a long-term stimulation of LH secretion, which mediated the testicular development and ¢nal maturation through elevated steroid levels (Mylonas, Gissis, Magnus & Zohar 1997;Mylonas, Zohar,Woods, Thomas & Schulz 1998;Mylonas & Zohar 2001;Mylonas et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Gonadotropin-releasing hormone analogue (GnRHa), previously named as LHRHa, has been used as an exogenous hormone to synchronize the gonadal development and accelerate the ¢nal gonadal maturation in several ¢sh species, such as in sockeye salmon (Oncorhynchus nerka) (Slater, Schreck & Amend 1995), male white sturgeon (Acipenser transmontanus) (Faulkner & Moberg 1997), European sea bass (Dicentrarchus labrax) (Rainis, Mylonas, Kyriakou & Divanach 2003) and golden rabbit¢sh (Siganus guttatus) (Komatsu et al 2006). Further studies showed that GnRHa multiple injection or the use of sustained-release GnRHa delivery systems can maintain a long-term stimulation of LH secretion, which mediated the testicular development and ¢nal maturation through elevated steroid levels (Mylonas, Gissis, Magnus & Zohar 1997;Mylonas, Zohar,Woods, Thomas & Schulz 1998;Mylonas & Zohar 2001;Mylonas et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Gonadotropin-releasing hormone analogue multiple injection potentially accelerated testicular maturation of male yellow catfish (Pelteobagrus fluvidraco, Richardson) in captivity

Zhuo

Zhang

Huang

et al. 2011

Aquaculture Research

View full text Add to dashboard Cite

The potential for accelerating testicular development and ¢nal maturation of adult male yellow cat¢sh (Pelteobagrus £uvidraco, Richardson) in captivity was evaluated by using gonadotropin-releasing hormone analogue (GnRHa) multiple injection, and its possible regulatory mechanism was explored by measurements of luteinizing hormone (LH) and steroid levels. The results showed that GnRHa multiple injection increased gonad-somatic index (GSI), the sperm count and the milt-testis index (MTI) and promoted the larvae production by elevated rates of fertilization and hatching, and lowered the rate of deformed larvae. Meanwhile GnRHa treatment decreased the percentages of spermatogonia and spermatocytes, increased the relative sperm density (RSD) and percentages of spermatids and spermatozoa (STZ), suggesting GnRHa treatment could accelerate meiotic division and enhance the formation of spermatids andSTZ. Moreover, pituitary and serum LH, as well as serum T levels were increased after GnRHa multiple injection. Taken together, the present study demonstrated GnRHa multiple injection successfully accelerated the testicular development and maturation of male yellow cat¢sh, which was mediated by the increase in serum LH and T levels that further mediated biological and histological changes of testis. Therefore, GnRHa multiple injection could be a valuable method to induce precocious testicular maturation of adult yellow cat¢sh with gonadal developmental arrest in captivity.

show abstract

Hormone Profiles of Captive Striped Bass Morone saxatilis During Spermiation, and Long‐Term Enhancement of Milt Production

Cited by 34 publications

References 52 publications

Gonadal development and steroid hormone profile of wild caught grey mullet (Mugil cephalus)

Gonadal development and steroid hormone profile of wild caught grey mullet (Mugil cephalus)

The control of reproduction in finfish species through GnRH treatments

Gonadotropin-releasing hormone analogue multiple injection potentially accelerated testicular maturation of male yellow catfish (Pelteobagrus fluvidraco, Richardson) in captivity

Contact Info

Product

Resources

About