Seasonal variation of the glycogen enzyme activity in diploid and triploid Pacific oyster gonad during sexual maturation

Kong, Lingfeng; Wang, Zhaoping; Yu, Ruihai; Li, Qi; Wang, Rucai

doi:10.1007/s11802-007-0383-0

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…; Kong et al . ). The here‐obtained results stress that differences in sensitive parameters, such as enzymatic activities, can occur if one uses diploid and triploid organisms.…”

Section: Resultsmentioning

confidence: 97%

Modulation of neuronal activity and hepatic metabolism by ploidy andl-carnitine supplement in rainbow trout (Oncorhynchus mykiss)

et al. 2013

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L-carnitine, a multiphysiological, bioactive and pollutionfree additive, is known to act as a growth-enhancer and appears to act as an antioxidant compound. However, high dosages may cause detrimental physiological effects to fish. Considering such, a feeding trial was carried out to evaluate the effects of dietary L-carnitine content on neuronal activity (acetylcholinesterasic activity), hepatic metabolism (catalase activity) and liver histological markers in both diploid and triploid trout (Oncorhynchus mykiss) juveniles. Fish were hand-fed for 56 days on three nutritionally identical diets, varying in L-carnitine content; unsupplemented diet (15 mg kg À1 ) and supplemented (200 or 530 mg kg À1 ) diets. Moderate to severe glycogen/lipid depletion was the major liver histopathological disorder observed in all dietary groups. This cause-effect relationship appeared to be dose and time-dependent, suggesting an important role of L-carnitine in the liver metabolism. Moreover, the hepatocite size and nuclear diameter appeared to be larger in L-carnitine supplemented groups than in control group. L-carnitine caused significant induction of catalase activity and inhibition of AChE. Diploid and triploid trouts showed marked differences in enzymatic activities, reflected by consistently higher values of AChE activities for triploid animals.

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“…; Kong et al . ). The here‐obtained results stress that differences in sensitive parameters, such as enzymatic activities, can occur if one uses diploid and triploid organisms.…”

Section: Resultsmentioning

confidence: 97%

Modulation of neuronal activity and hepatic metabolism by ploidy andl-carnitine supplement in rainbow trout (Oncorhynchus mykiss)

et al. 2013

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“…Glycogen reserves are mobilized in bivalves during periods of food depletion and high energy demand (Bayne 1976;Barber and Blake 1981;Berthelin et al 2000). These reserves are usually regulated by a metabolic flux towards reproductive output, as demonstrated by Kong et al( 2007) in C. gigas triploids. Laboratory experiments showed that glycogen storage in C. gigas is related to the availability of food, and thus, reproductive effort is correlated with glycogen concentration in oysters (Delaporte et al 2006).…”

Section: Effect Of Sexmentioning

confidence: 99%

Physiological responses of female and male black-lip pearl oysters(Pinctada margaritifera)to different temperatures and concentrations of food

Chávez‐Villalba

Soyez

Aurentz

et al. 2013

Aquat. Living Resour.

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-This study was designed to measure responses of four-year-old black-lip pearl oysters (Pinctada margaritifera) to different temperatures and food concentrations and to identify the energy requirements of each sex. Oysters were fed a monospecific microalgal diet of Isochrysis affinis galbana (T-iso). Measurements of oxygen consumption and ingestion rates were carried out at 24• C and 27• C and at two algal (T-iso) concentrations: 5000 and 30 000 cell ml −1 . Glycogen content in adductor muscle, absorption efficiency and scope for growth were also estimated. Females and males responded differently to environmental factors, with food level being the most influential parameter. Oxygen consumption and absorption efficiency were significantly higher in females than in males, but males had significantly higher glycogen content than females. At high food concentration, glycogen content, ingestion rate, oxygen consumption, and scope for growth were significantly higher than at the low food concentration. Only absorption efficiency was significantly higher at the low food concentration. Oxygen consumption was significantly higher at 27• C than at 24 • C. These results indicate that females and males have different bioenergetic functioning and that energy demands for reproduction are higher in females.

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Heterogeneous growth of the triploid Pacific oysters Crassostrea gigas created by chemical inhibition of polar body release

Jo¹,

Han²,

Hur³

et al. 2014

The Korean Journal of Malacology

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Triploids have several potential advantages over diploids in aquaculture, drawing an elevated commercial reaction into the realistic application of the techniques despite we are still in the early stage of triploid industry for the Pacific oysters Crassostrea gigas. We traced the growth performance of the triploid C. gigas for over a year from hatchery spats, which was created by manipulations of chemicals (Cytochalasin B, CB or 6-Dimethylaminopurine, 6-DMAP). The growth was clearly marked by an initial longer dormancy and following a great magnitude of heterogeneity. The dormancy was almost 9 to 10-month long or even longer and was considered as a downside of the creation. The heterogeneity was magnified by appearance of extraordinarily growing oysters in part during summer season, which could be a representative upside of the triploids. Overall, however, the results were not as positive as were expected. The longer dormancy and following heterogeneity observed in our practice could be marked as an additional negative sign of the chemical use. The present study, thus, might be highly indicative in the introduction of biological cross between tetraploid and diploid to produce natural triploid embryos.

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Seasonal variation of the glycogen enzyme activity in diploid and triploid Pacific oyster gonad during sexual maturation

Cited by 3 publications

References 18 publications

Modulation of neuronal activity and hepatic metabolism by ploidy andl-carnitine supplement in rainbow trout (Oncorhynchus mykiss)

Modulation of neuronal activity and hepatic metabolism by ploidy andl-carnitine supplement in rainbow trout (Oncorhynchus mykiss)

Physiological responses of female and male black-lip pearl oysters(Pinctada margaritifera)to different temperatures and concentrations of food

Heterogeneous growth of the triploid Pacific oysters Crassostrea gigas created by chemical inhibition of polar body release

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