Morphology of ovarian changes during the reproductive cycle of the fish, &lt;i&gt;Mystus tengara&lt;/i&gt; (Ham.)

Guraya, Sardul S.; Kaur, Rajinder; Saxena, P.K.

doi:10.1159/000144387

Cited by 42 publications

(37 citation statements)

References 23 publications

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“…The process of ovarian and follicular atresia in freshwater fish is a common phenomenon happening both in wildfish and confined fish (Guraya et al, 1975;Shanbhag and Saidapur, 1996); Romagosa et al, 2001). The according these authors, the process of degeneration can happen in fish at different stages of ovarian development (pre-spawning, spawning and postspawning).…”

Section: Discussionmentioning

confidence: 99%

Occurrence and significance of ovarian and follicular regression in cachara Pseudoplatystoma fasciatum (Linnaeus, 1766): a histology approach

Leonardo

Romagosa²,

Batlouni

et al. 2006

Arq. Bras. Med. Vet. Zootec.

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Occurrence and significance of ovarian and follicular regression in cacharaPseudoplatystoma fasciatum (Linnaeus, 1766): a histology approach ABSTRACTThe processes of ovarian regression and follicular atresia which reproduction was not induced by hormone in confined cachara, Pseudoplatystoma fasciatum, were investigated. The macro and microscopic characteristics (oocytes diameter and histology) of the ovaries were described every 20 days, in four stages: initial regression (Rg I = first 20 days), intermediate regression (Rg II = from 21st to 40th day), final regression (Rg III = from 41st to 80th day) and the recovering stage, called resting II (R II = from 81st to 150th day). The experiment was conducted from late January (summer -longer days) to May (autumn -shorter days). In the beginning, A0 samples showed oocyte diameters ranging from 437.5 to 1,187.5µm, suggesting that oocytes were in perinucleolar, at final maturation and atretic phases. After 150 days, the diameters reached the lowest values and a ruptured zona radiata, as well as the nearly complete reabsorption of the yolk could be visualized. At the same time, a sharp decrease in the mean values of the gonadosomatic index (GSI), water temperature, photophase and rainfall was observed. The gradual involution of this long process was dynamic and complex, affecting the spawning success (fertilization, eclosion and larvae survival rates) and, consequently, the whole productive system. Keywords: cachara, Pseudoplatystoma fasciatum, ovarian regression, atretic follicle, histology RESUMO Estudaram-se os processos de regressão ovariana e atresia folicular em cachara, Pseudoplatystoma fasciatum, mantida em cativeiro, na reprodução não induzida por hormônios. As características macro e microscópicas (diâmetro dos ovócitos e histologia) dos ovários foram descritas a cada 20 dias, em quatro estádios: na regressão inicial (Rg I -os primeiros 20 dias), na regressão intermediária (Rg II -do 21º ao 40º dia), na regressão final (Rg III -do 41º ao 80º dia) e na fase de recuperação ou de repouso II (R II -do 81º ao 150º dia). O experimento foi realizado do final de janeiro (verão-dias longos) a maio (outono-dias curtos

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Section: Discussionmentioning

confidence: 99%

Occurrence and significance of ovarian and follicular regression in cachara Pseudoplatystoma fasciatum (Linnaeus, 1766): a histology approach

Leonardo

Romagosa²,

Batlouni

et al. 2006

Arq. Bras. Med. Vet. Zootec.

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“…For each female, 30 random oocytes with clear nucleus were considered, and both their vertical and horizontal diameters were measured. The stage of maturation for oocytes and spermatogonia was evaluated following Yamamoto and Yamauchi (1974), Guraya et al (1975) and Miura et al (1991). Each oocyte was categorised into one of the following stages): stage I, oogonium; stage II, previtellogenic oocyte (very few or no oil droplets); stage III, presence of cortical alveolus (many oil droplets); stage IV, early vitellogenic oocyte (peripheral yolk granules); stage V, midvitellogenic oocyte (peripheral yolk granules as well as central yolk platelets).…”

Section: Final Measurementsmentioning

confidence: 99%

Effect of hormone injection frequency on the lipid content and fatty acid compositions in gonad, muscle and liver of Anguilla japonica during artificial maturation

Rupia

Shen

et al. 2013

Aquacult Int

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Two groups of Anguilla japonica were treated with hormone, one on a weekly basis, the other on a biweekly basis. Intramuscular injection was applied at a dose of 0.75 mg/kg BW carp pituitary extract (CPE) plus 150 IU/kg BW human chorionic gonadotropin (hCG) for female fish, while males received half of this dose. The average total lipid content of the gonads from the weekly treated group, i.e. 20.6 ± 1.2 % for females and 18.0 ± 2.3 % for males, was significantly higher than the biweekly treated group, 16.8 ± 0.7 and 15.5 ± 1.3 %, respectively (p \ 0.05). For both muscle and liver, the readings were not significantly different. The gonads from the weekly treated fish had more fatty acids, particularly saturated fatty acids, polyunsaturated fatty acids, highly unsaturated fatty acids, eicosapentaenoic acid (20:5n-3, EPA), docosahexaenoic acid (22:6n-3, DHA) and arachidonic acid (20:4n-6, ARA). Histological examination showed that the ovaries of both the weekly and the biweekly treated fish were mainly at stage IV. However, the weekly treated females had bigger oocyte diameter (722.0 ± 60.9 lm) than the biweekly females (611.6 ± 22.6 lm). These results suggest that CPE and hCG promoted the maturation process for both scheduled induction and that the frequency of hormone injection influenced the biochemical composition of gonads, especially their lipids. Our study describes for the first time the effect of hormone injection frequency on the lipid content and fatty acid composition in the gonads of A. japonica during artificial maturation.

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“…Sections for oocyte staging were stained with either hematoxylin and eosin or Mallory trichrome. Oocytes whose nuclei were visible in the section were staged as previously described ( 20,23,24 ). The most developmentally advanced oocytes within the ovary determined the oocyte stage assigned to individual fi sh.…”

Section: Histological Analysismentioning

confidence: 99%

Effects of reproductive stage and 11-ketotestosterone on LPL mRNA levels in the ovary of the shortfinned eel

Divers

McQuillan

Matsubara

et al. 2010

Journal of Lipid Research

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This article is available online at http://www.jlr. org Lipoproteins, particles that transport lipids through the blood stream, are distinguished by density and size: from large, low density macromolecules, such as chylomicrons and very low density lipoproteins (VLDL) (high lipid and low protein content), to smaller, high density macromolecules, such as high density lipoproteins and vitellogenin (low lipid and high protein content) ( 7 ). The main lipoprotein component of eel plasma is VLDL ( ‫ف‬ 44% of total plasma lipoproteins), and TAG is its major lipid class (57-66% of VLDL composition ( 8 )). Associated with the lipoproteins is apolipoprotein CII (apoCII), a peptide that has the ability to specifi cally activate the enzyme lipoprotein lipase (LPL) ( 9 ). LPL is attached to the luminal endothelium and located in close proximity to the adipocytes, where it hydrolyses bound TAGs to free fatty acids (FFA). These FFAs, in turn, are sequestered by the surrounding tissue and re-esterifi ed for storage as TAG (e.g., adipose tissue) or oxidized for energy (e.g., muscle tissue ( 10 )). As the catabolism of FFA provides the main source of energy for many species ( 11 ), LPL is considered a key enzyme in whole body lipid metabolism and balance, and the extrahepatic rate-limiting enzyme in the hydrolysis of circulating TAG (12)(13)(14).Aside from their importance in generating energy, the lipid composition of eggs is a key determinant of egg quality in marine fi sh (reviewed in Ref. 15 ); however, there is almost no information about when and how neutral lipids are incorporated into the oocyte or the role that LPL plays in this event. Likewise, the fate and, in particular, the movement of neutral lipid from storage depots to the ovary throughout oogenesis is largely unknown, despite the obvious relevance of these issues for aquaculture operations. Freshwater eels are highly suitable experimental models for the study of lipid movement and uptake as they Abstract To understand the dynamics of lipid uptake into the ovary and the potential role that lipoprotein lipase plays in this event, changes in LPL transcript abundance during oogenesis were measured in both wild-caught and pituitary homogenate-induced artifi cially maturing eels. Also, the effects of 11-ketotestosterone (11-KT) on LPL mRNA levels were investigated in vivo and in vitro. Normalized ovarian LPL transcript abundance increased as oogenesis advanced, and it rose particularly rapidly during midvitellogenesis, corresponding to pronounced increases in ovarian lipid deposits and LPL activity. Furthermore, LPL mRNA levels were dramatically increased following 11-KT treatment in vivo, fi ndings that were reinforced as trends in ovarian tissue incubated in vitro. Ovarian LPL appears to be directly involved in the uptake of lipids into the eel ovary, an involvement that appears to be controlled, at least in part, by the androgen 11-KT. It is well established in teleosts that lipids form the major component of the body nutrient pool in terms of energy storage ( 1...

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Morphology of ovarian changes during the reproductive cycle of the fish, <i>Mystus tengara</i> (Ham.)

Cited by 42 publications

References 23 publications

Occurrence and significance of ovarian and follicular regression in cachara Pseudoplatystoma fasciatum (Linnaeus, 1766): a histology approach

Occurrence and significance of ovarian and follicular regression in cachara Pseudoplatystoma fasciatum (Linnaeus, 1766): a histology approach

Effect of hormone injection frequency on the lipid content and fatty acid compositions in gonad, muscle and liver of Anguilla japonica during artificial maturation

Effects of reproductive stage and 11-ketotestosterone on LPL mRNA levels in the ovary of the shortfinned eel

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