Abstract：
:The manner in which behavior influences the gonadotropin-releasing hormone (GnRH) axis in hermaphroditic fishes is not understood. The Gilthead seabream, Sparus aurata, is a protandrous hermaphrodite with a complex gonadal cycle consisting of a quiescent, pre-spawning, spawning, and post-spawning stage. On two separate experiments, I used real-time quantitative PCR to measure the mRNA expression of three GnRH isoforms in homogenized seabream whole-brain extracts. In the first experiment, I measured the levels of GnRH-1, GnRH-2, and GnRH-3 mRNA throughout the gonad cycle. All three GnRH mRNAs increase around the peak of the spawning season (December). GnRH-3 mRNA expression is also elevated in August, which coincides with the beginning of gonad differentiation. All three GnRH mRNAs have the lowest expression levels in the month of September. There was no difference between males and females in the expression levels of any of the three GnRH mRNA. In the second experiment, I measured individual dominance ranks in six groups of fish, three during quiescence and three during spawning. GnRH-1 mRNA expression was positively correlated with dominance rank only during the quiescent period. The more dominant fish tended to have higher GnRH-1 mRNA expression. The existence of a quiescent-only correlation between GnRH-1 mRNA and dominance rank suggests a mechanism by which activation of gonad maturation could occur first in the most dominant ambisexual fish.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Reyes-Tomassini J,Wong TT,Zohar Ydoi
10.1007/s10695-012-9757-3subject
Has Abstractpub_date
2013-08-01 00:00:00pages
993-1005issue
4eissn
0920-1742issn
1573-5168journal_volume
39pub_type
杂志文章abstract：:Spotted wolffish Anarhichas minor reproduction in captivity is dependent on in vitro fertilization. However, it is often challenging to acquire sufficient fresh sperm to fertilize the eggs that are obtained. In this study, we evaluate the possibility to store spotted wolffish sperm by refrigeration. Spotted wolffish s...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-020-00820-w
更新日期：2020-06-02 00:00:00
abstract：:The main indication of cimetidine is being H₂-receptor antagonist, but studies suggest that cimetidine may also act as a non-specific stimulant of cell-mediated immunity and immunomodulator. In order to determine the immunomodulatory effect of dietary intake of cimetidine in the common carp (100 ± 10 g), subjects were...
journal_title：Fish physiology and biochemistry
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更新日期：2013-12-01 00:00:00
abstract：:Germinal vesicle migration (GVM) and/or dissolution (GVD) were measured in goldfish oocytes, treated with 17α, 20β dihydroxyprogesterone (DHP) and other compounds considered to effect the cytoskeleton and oxidative phosphorylation,in vitro. Administration of DHP reinitiated meiotic maturation, increasing GVM and GVD i...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02311136
更新日期：1986-09-01 00:00:00
abstract：:Scrutiny of the zebrafish (Danio rerio) genomic database confirmed eight functional vitellogenin (vtg) genes, each with one or two transcript variants, and the encoded Vtg polypeptides were structurally and functionally characterized in detail by in silico and experimental analyses. There were five type I (vtgs1, 4, 5...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-018-0524-y
更新日期：2018-12-01 00:00:00
abstract：:Feeding experiments and laboratory analyses were conducted to establish the essential fatty acid (EFA) requirement of red drum (Sciaenops ocellatus). Juvenile red drum were maintained in aquaria containing brackish water (5 ± 2‰ total dissolved solids) for two 6-week experiments. Semipurified diets contained a total o...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004370
更新日期：1993-10-01 00:00:00
abstract：:Due to rapid depletion of wild stocks, the necessity to cultivate fish is eminent. Current fish farming practices seek to improve flesh quality. The notion that white muscles are the main target of the fishing industry is emphasized. A novel approach is suggested based on the development of white muscles in wild fish ...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-011-9501-4
更新日期：2011-06-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0110-5
更新日期：2015-12-01 00:00:00
abstract：:A study on the effect of three different anabolic-androgenic steroids on the growth, food conversion efficiency and nucleic acid contents of liver, kidney, brain and muscle of carp,Cyprinus carpio was undertaken. The three steroids, methyltestosterone (MT), ethylestrenol (EE) and oxandrolone (ON), were fed in differen...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF01874771
更新日期：1989-05-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-018-0564-3
更新日期：2018-12-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00003377
更新日期：1995-10-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004376
更新日期：1993-08-01 00:00:00
abstract：:Post mortem storage is a necessary process for removal of pin bones without destruction of fillets, thereby avoiding volume and economic loss. However, the enzymes involved in loosening pin bones during storage have not been studied to a great extent. In this study, the activities and localization of MMPs in the conne...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-016-0264-9
更新日期：2017-02-01 00:00:00
abstract：:Ubiquitin-conjugating enzymes (E2s) play an important role in the mechanism of ubiquitin transfer. Although in most species many of these enzymes share high sequence and structural conservation, their existence and functions in the lamprey remain unknown. In this study, we identified and characterized a ubiquitin-conj...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-015-0139-5
更新日期：2016-02-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-010-9380-0
更新日期：2010-12-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004715
更新日期：1989-06-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-011-9521-0
更新日期：2012-04-01 00:00:00
abstract：:Prolactin (PRL) is one of the most versatile hormones found in the pituitary of vertebrates and exerts its actions through binding to a specific PRL receptor (PRLR). Here we describe the cloning and characterization of a second prolactin receptor (ntPRLR2), isolated from the ovary of Nile tilapia (Oreochromis niloticu...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-009-9355-1
更新日期：2010-06-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00004649
更新日期：1992-05-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF00003410
更新日期：1990-11-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
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更新日期：1994-12-01 00:00:00
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journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-019-00737-z
更新日期：2020-02-01 00:00:00
abstract：:In vertebrate species, the biopotential embryonic gonad differentiation is affected by many key genes and key steroidogenic enzymes. Insulin-like growth factor-1 receptor (Igf1r) has been considered as an important sex-differentiation gene in mammals and could mediate the biological action of Igf1, an important regula...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
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更新日期：2014-08-01 00:00:00
abstract：:The aims of the present study were to characterize sperm quality and to quantify seasonal changes in sexual hormone (testosterone [T], 11-ketotestosterone [11-KT] and 17,20β-dihydroxypregn-4-en-3-one [17,20β-P]) levels in male brill (Scophthalmus rhombus) plasma, as well as to test a more intensive sampling strategy t...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-012-9692-3
更新日期：2013-04-01 00:00:00
abstract：:Dietary fatty acids, particularly arachidonic acid (ARA), affect cortisol and may influence the expression of genes involved in stress response in fish. The involvement of ARA on stress, lipid, and eicosanoid metabolism genes, in Senegalese sole, was tested. Post-larvae were fed Artemia presenting graded ARA levels (0...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-013-9778-6
更新日期：2013-10-01 00:00:00
abstract：:Transferrin mRNA in liver was quantified in farmed Atlantic salmon (Salmo salar) fed three different levels (310-, 65-, and 40 ppm) of dietary iron for 26 weeks. At the time of sampling, the fish fed 40 ppm iron showed symptoms of iron deficiency. Mean values of liver storage iron was reduced from 84 to 12 mg kg(-1) a...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/BF02112358
更新日期：1996-08-01 00:00:00
abstract：:The present study investigates the nephrotoxic effects of two acute doses of silver nanoparticles (AgNPs) and silver nitrate (AgNO3) on the African catfish, Clarias gariepinus, using biochemical, histochemical, and histopathological changes as biomarkers. AgNP-induced impacts were recorded in some of these characteris...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-019-00686-7
更新日期：2019-12-01 00:00:00
abstract：:The extensive use of pharmaceuticals in human and veterinary medicine may enter the aquatic environment and pose a serious threat to non-target aquatic organisms like fish. In this study, Indian major carp Cirrhinus mrigala was exposed to different concentrations (1, 10 and 100 μg L⁻¹) of most commonly used pharmaceut...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-013-9797-3
更新日期：2013-12-01 00:00:00
abstract：:A completely randomized experimental design carried out to investigate the effects of different levels of Pediococcus acidilactici (PA) including 0 (basal diet as a control diet), 1 × 106, 2 × 106, 4 × 106, and 8 × 106 colony-forming unit (CFU) per gram of the diet for 60 days on the mucosal immunity responses, growth...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-020-00903-8
更新日期：2020-11-26 00:00:00
abstract：:Bacillus circulans PB7, isolated from the intestine of Catla catla, was evaluated for use as a probiotic supplement in the feeds for the fingerlings of Catla catla. The effect of supplement on the growth performance, feed utilization efficiency, and immune response was evaluated. Catla fingerlings (ave. wt. 6.48 +/- 0...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-008-9272-8
更新日期：2009-08-01 00:00:00
abstract：:Environmental stressors caused by inadequate aquaculture management strategies suppress the immune response of fish and make them more susceptible to diseases. Therefore, efforts have been made to relieve stress in fish by using various functional feed additives in the diet, including probiotics. The present work eval...
journal_title：Fish physiology and biochemistry
pub_type： 杂志文章
doi：10.1007/s10695-016-0277-4
更新日期：2017-02-01 00:00:00
