Immunocytochemical studies of the gonadotropic cells in the pituitary gland of male mullet, Mugil cephalus, during the annual reproductive cycle in both natural habitat and captivity

Mousa, Mostafa A.; Mousa, SA

doi:10.1046/j.1439-0426.2000.00226.x

Cited by 9 publications

(11 citation statements)

References 16 publications

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“…Somatolactin function in teleost fish is not yet fully established, since mode of action depends on the species considered (Kaneko, ). Some studies suggested that SL is involved in sexual maturity and smoltification in salmonid species (Rand‐Weaver et al, ; Bhandari et al, ; Onuma et al, ); and in adaptation to background and photoperiod changes (Zhu and Thomas, ; Ayson and Takemura, ); metabolism and acid‐base balance (Kakizawa et al, ; Zhu and Thomas, ), stress response (Rand‐Weaver et al, ), and reproductive physiology in non‐salmonid species (Mousa and Mousa, ; Honji et al, ). Furthermore, environmental variations, such as photoperiod and temperature changes, can influence the SL profile (Vargas‐Chacoff et al, ; Fiszbein et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Mousa and Mousa () observed morphometrical variations in SL cells of Oreochromis niloticus and Mugil cephalus during the reproductive period, with higher synthetic and secretory activity during sexual maturation and spawning, suggesting that SL is involved in some reproductive processes. Furthermore, the larger nuclear area and higher OD observed in vitellogenic S. hilarii females (Honji et al, ) also suggests higher cellular activity during the reproductive period in this species.…”

Section: Discussionmentioning

confidence: 99%

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Gonadotropins and Growth Hormone Family Characterization in an Endangered Siluriform Species, Steindachneridion parahybae (Pimelodidae): Relationship With Annual Reproductive Cycle and Induced Spawning in Captivity

Honji

Caneppele

Pandolfi

et al. 2015

The Anatomical Record

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The aim of this study was to identify and characterize pituitary cells of Steindachneridion parahybae females in captivity, highlighting the possible relationship with reproductive disorders at this level, since this species shows oocyte final maturation, ovulation and spawning dysfunction in captivity. The localization and distribution of growth hormone (GH), prolactin (PRL), somatolactin (SL), b-luteinizing hormone (b-LH), and b-follicle stimulating hormone (b-FSH) immunoreactive (-ir) cells in the adenohypophysis was studied by immunohistochemical and Western blot methods. In addition, cellular morphometric analyses and semi-quantification of ir-cells optical density (OD) during the annual reproductive cycle and after artificial induced spawning (AIS) were performed. Results showed that the distribution and general localization of pituitary cell types were similar to that of other teleost species. However, the morphometrical study of adenohypophysial cells showed differences along the reproductive cycle and following AIS. In general, females at the vitellogenic stage presented greater OD values for GH, PRL and SL than at other maturation stages (previtellogenic and regression stages), probably indicating an increased cellular activity during this stage. Conversely, b-LH OD did not vary during the annual reproductive cycle. After AIS, b-LH, SL and GH ir-cells showed an increase in OD values suggesting a possible involvement on oocyte final maturation, ovulation and spawning or a feedback control on the brain-pituitary-gonads axis. Reproductive dysfunction in S. parahybae females in captivity may be due to alteration of the synthesis pathways of b-LH. In addition, GH family of hormones could modulate associated mechanisms that influence the reproductive status in this species. Anat

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Gonadotropins and Growth Hormone Family Characterization in an Endangered Siluriform Species, Steindachneridion parahybae (Pimelodidae): Relationship With Annual Reproductive Cycle and Induced Spawning in Captivity

Honji

Caneppele

Pandolfi

et al. 2015

The Anatomical Record

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“…Its production is still remaining restricted until the induced spawning techniques are developed. This allows these valuable aquaculture species to become available worldwide.Like females of many commercially important fishes, mullets fail to complete ovarian development and do not undergo final oocyte maturation (FOM), ovulation or spawning when reared in captivity (Mousa, 1994;Mousa and Mousa, 1997;El-Gamal, 1999 andMousa, 2010). To facilitate a steady supply of seeds, oocyte maturation and ovulation need to be induced.…”

Section: Introductionmentioning

confidence: 99%

The impact of live food enrichment on the growth performance and survival rate of thin-lipped mullet, Liza ramada larvae

Khalil¹,

Khalaf-Allah²,

Kora³

et al. 2018

Egypt. J. of Aquatic Biolo. and Fish.

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Keywords:Liza ramada growth performance Brachionus plicatilis Nannochloropsis oculata Live foodThe feeding success of Liza ramada larvae at early developmental stages depends on the provision of suitable food and rearing environment and on the visibility and adequate density of the prey. In the present study, the suitability of the marine enriched rotifers, Brachionus plicatilis as a starter food followed by enriched Artemia nauplii and their effects on the growth performanceand survival ratewere investigated for rearing of Liza ramada larvae.Induced spawning of mature Liza ramada breeders was done to produce the larvae. After hatching, the larvae were stocked at a density of 20 larvae/l in 50-l glass aquaria, under different feeding conditions for three periods; green water conditions; with Nannochloropsis oculata (2.5×10 5 cells/ml) for 7 days, rotifers (8-10 individuals/ml) for 28 days and Artemia salinanuplii (4-6 individuals/ml) for 28 days. Four groups were applied for both rotifers and Artemia; green water conditions with rotifers or Artemia enriched with N. oculataor yeast and clear water conditions with rotifers or Artemia enriched with N. oculata or yeast.The results showed improvement in growth and survival rates of Liza ramada larvae fed on green water with Brachionus plicatilis or Artemia salina enriched with N. oculata at the end of 7 th day, 35 th day and 63 rd day post-hatching, respectively. This indicates that the algae N. oculata is essential not only for feeding requirement of larvae at first feeding but also for water quality improvement. Larval wet weight varied significantly between the treatments. However, the final length of the larvae did not vary significantly between the treatments.In conclusion, the presence of green algae Nannochloropsis oculataduring Liza ramada larval rearing, in water or as enrichment media for live food, is essential not only for growth performance but also for raising survival rate.

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“…Similar to females of many commercially important fishes, mullet do not undergo final oocyte maturation (FOM), ovulation or spawning in captivity [1][2][3] . Consistently, the ova will not advance to final maturation and ovulation without exogenous hormone stimulation, but will undergo atresia and degenerate.…”

Section: Introductionmentioning

confidence: 99%

Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

Mousa

Khalil

Hashem

et al. 2017

Egyptian Journal of Histology

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Introduction: Gonadotropin releasing hormone (GnRH) is a crucial regulator of gonadal development and reproduction in fish. In addition, it is a possible secretagogue of somatolactin (SL) in teleosts. Little is known about the possible association of GnRH and SL during reproduction of Liza ramada. Aim of the work: The present study was designed to investigate the GnRH and SL immunoreactivities during inducing the final stages of maturation, ovulation and spawning of Liza ramada; to assess the possible actions of these hormones on sexual maturation and spawning of teleosts. Materials and Methods: Histological and immunohistochemical techniques were generally performed to describe the immunoreactivity of both GnRH and SL during ovarian maturation and spawning of Liza ramada. Results: The mammalian GnRH (mGnRH) cell bodies were observed in the medulla oblongata. However, SL-immunoreactive (-IR) cells were detected in the pars intermedia (PI) of the pituitary gland. The GnRH-IR nerve terminals are in close contact with SL-IR pituitary cells. Importantly, the activity of both mGnRH-IR neurons and SL-IR pituitary cells were increased as reflected with the increased cell number and size during sexual maturation and spawning. The activity of these cells was more pronounced as indicated by the increased cells number and size with more immunoreactivity in pre-spawning female. During final maturation and spawning, mGnRH-IR neurons and SL cells showed an increase in the secretory activity as reflected by their small sizes, vacuolated appearance and weak immunoreactivity. Conclusions: Taken together, these findings suggest that the close contact of mGnRH-IR terminals with SL-IR cells in the pituitary, together with the concomitant changes of GnRH and SL immunoreactivity in response to progress in the reproductive events suggest that GnRH may regulate SL release and the regulation of reproductive activity in L. ramada.

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Immunocytochemical studies of the gonadotropic cells in the pituitary gland of male mullet, Mugil cephalus, during the annual reproductive cycle in both natural habitat and captivity

Cited by 9 publications

References 16 publications

Gonadotropins and Growth Hormone Family Characterization in an Endangered Siluriform Species, Steindachneridion parahybae (Pimelodidae): Relationship With Annual Reproductive Cycle and Induced Spawning in Captivity

Gonadotropins and Growth Hormone Family Characterization in an Endangered Siluriform Species, Steindachneridion parahybae (Pimelodidae): Relationship With Annual Reproductive Cycle and Induced Spawning in Captivity

The impact of live food enrichment on the growth performance and survival rate of thin-lipped mullet, Liza ramada larvae

Immunohistochemical study of gonadotropin-releasing hormone and somatolactin during induced spawning of Liza ramada

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