Endocrine profiles during silvering of the European eel (Anguilla anguilla L.) living in saltwater

Ginneken, Vincent van; Durif, Caroline; Dufour, Sylvie; Sbaihi, Miskal; Boot, R.; Noorlander, Kees; Doornbos, Johannes; Murk, Albertinka J.; Thillart, G. van den

doi:10.1163/157075607782232143

Cited by 20 publications

(3 citation statements)

References 27 publications

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“…Those results show that although other environmental factors may play a role in the field, exercise alone can act as a main trigger for early maturation defined by the fat vesicle stage (Adachi et al 2003; Wallace and Selman 1981; Tyler and Sumpter 1996). Silver eels have been reported to have a higher activity than yellow eels (van Ginneken et al 2005) as well as higher cortisol levels (van Ginneken et al 2007b). Cortisol may be responsible for lipid mobilisation to fuel swimming exercise but may also play a role in lifting the dopaminergic inhibition of sexual maturation in female eels (Dufour et al 2003; Palstra et al 2008, 2010c), perhaps by binding to glucocorticoid receptor—expressing neurons (Teitsma et al 1999).…”

Section: Discussionmentioning

confidence: 99%

“…Postponement of reproductive migration to increase the amount of stored fat may well be a strategy to optimise reproductive output. The monthly variation of metabolic and sexual maturation parameters in a downstream brackish estuary has been intensively studied (Van Ginneken et al 2007b, c). However, the temporal variation of migration and maturation status at upstream regions over the months of the freshwater spawning run remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Temporal progression in migratory status and sexual maturation in European silver eels during downstream migration

Palstra

Guerrero

Laak

et al. 2011

Fish Physiol Biochem

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The onset of downstream migration of European eels is accompanied by a cessation of feeding and the start of sexual maturation which stresses the link between metabolism and sexual maturation, also suggesting an important role for exercise. Exercise has been tested with eels in swim tunnels and was found to stimulate the onset of sexual maturation. In this study, we have investigated the interplay between migration and maturation in the field during the downstream migration of female silver eels. Temporal changes in migratory status and sexual maturation among silver eels of the upstream Rhine River system over 3 months of the migration season (August, September and October) were determined in biometrical parameters, plasma 17β-estradiol and calcium levels, oocyte histology and gonadal fat levels. Furthermore, the ecological relevant parameters age as determined by otolithometry and health aspects indicated by haematocrit, haemoglobin and swim-bladder parasite load were measured. Silver eels were estimated to be 14 years old. A strong temporal progression in migratory stage was shown over the months of downstream migration. Catches probably represented a mix of reproductive migrants and feeding migrants of which the ratio increased over time. Furthermore, this study confirmed our hypothesis linking the migratory stage to early maturation as indicated by enlargement of the eyes, oocyte growth and fat deposition in the oocytes, exactly the same changes as found induced by exercise but not ruling out environmental influences. Migrants show extensive fat uptake by the oocytes, probably stimulated by the swimming exercise. In addition, at least 83% of the silver eels in this spawning run may have suffered from negative effects of swim-bladder parasites on their swimming performance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temporal progression in migratory status and sexual maturation in European silver eels during downstream migration

Palstra

Guerrero

Laak

et al. 2011

Fish Physiol Biochem

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“…Penelitian ini menemukan bahwa sidat perlakuan hTA tumbuh hingga mencapai panjang 61±7 cm dan bobot 490±77 g tergolong besar bila dibandingkan dengan yang ditemukan oleh Van Ginneken et al (2007) pada A. japonica dengan bobot 450-550 g dengan nilai GSI 3,55%. Nilai GSI ini kontras dengan perlakuan E 2 dengan nilai GSI 1,64% (Wang & Lou, 2007).…”

Section: Perkembangan Gsi Dan Hsi Ikan Sidatunclassified

The gonad growth of Anguilla bicolor bicolor induced by hormone combination of HCG, MT, E2, and antidopamine

Zahri¹,

Sudrajat²,

Zairin³

2015

Jurnal Akuakultur Indonesia

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ABSTRACT The aim of the study was to stimulate eel gonad growth by intramuscularly injection with a hormonal combination of human chorionic gonadotropin (hCG), methyltestosterone (T), estradiol (E2) and antidopamine (A) meanwhile 0.9% NaCl solution was used as control. Estradiol concentration in the blood serum were measured by enzyme-linked immunosorbent assay (ELISA). Stimulation with hCG 20 IU/kg in combination with MT 3 mg/kg and 10 μg/kg antidopamine (hTA treatment) very effective for increased the growth of gonads with indicators gonadosomatic index (GSI) of 4.80%, hepatosomatic index 1.01% and concentration of E2 2.49±0.67 ng/mL were significantly different (P<0.05) than others treatment after ten weeks of application. Key words: hormone, gonad growth, maturation, Indonesian short finned eel ABSTRAK Penelitian ini bertujuan untuk mengetahui pertumbuhan gonad yang distimulasi oleh kombinasi human chorionic gonadotropin (hCG), metiltestosteron (MT), estradiol (E2) dan antidopamin (A). Ikan sidat disuntik dengan hormon dan 0,9% NaCl sebagai kontrol secara intramuskular. Pengukuran konsentrasi hormon E2 dalam serum darah dengan enzyme-linked immunosorbent assay (ELISA). Stimulasi dengan hCG 20 IU/kg dikombinasi dengan MT 3 mg/kg dan antidopamin 10 μg/kg (perlakuan hTA) sangat efektif untuk feminisasi dan meningkatkan pertumbuhan gonad dengan indikator indeks gonadosomatik (GSI) 4,80%, indeks hepatosomatik 1,01% dan konsentrasi E2 2,49±0,67 ng/mL, secara signifikan berbeda pada taraf P<0,05 dibandingkan perlakuan lain setelah sepuluh minggu aplikasi. Kata kunci: hormon, pertumbuhan gonad, maturasi, sidat

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American Eel Fecundity and Ovary Maturation in Relation to Body Size and Geographic Distribution

Jessop

2018

Mar Coast Fish

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Fecundity, in relation to body length and weight, of migrating, sexually maturing female American Eels Anguilla rostrata differed significantly among sites between the upper St. Lawrence River (USLR) and south to Chesapeake Bay along the Atlantic coast of North America. Fecundity-size relations from two of four American Eel studies may be underestimated, affecting the interpretation of fecundity relations with size and distance from the spawning area and between Atlantic anguillid species. Body condition and ovary condition varied widely within and among sites. Condition at continental departure may have no geographic trend. The declines in condition during downstream migration within the St. Lawrence River and with increasing distance from the spawning area along the Atlantic coast may be statistical artifacts. Ovary condition increased for eels migrating downstream between the USLR and its middle estuary but showed no geographic trend at estuarine and coastal departure. Decreased relative fecundity with increasing size implies that the loss of large, fecund females from areas such as the USLR may have less of an effect on population fecundity than previously hypothesized but may be important for genetic and other reasons. Increased size and tissue lipid levels and decreased relative fecundity may be traits that aid American Eels migrating longer distances to spawn successfully. American Eels depart freshwaters with a higher fecundity and gonad development and lower tissue lipid levels and ova diameters than do similarly sized European Eels A. anguilla. Standardized methods and adequate sample sizes are needed to enhance the comparability and interpretation of fecundity studies. A better understanding of the relations among geographic differences in eel size, reproductive traits, and abundance is essential to effectively manage the American Eel population.

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Endocrine profiles during silvering of the European eel (Anguilla anguilla L.) living in saltwater

Cited by 20 publications

References 27 publications

Temporal progression in migratory status and sexual maturation in European silver eels during downstream migration

Temporal progression in migratory status and sexual maturation in European silver eels during downstream migration

The gonad growth of Anguilla bicolor bicolor induced by hormone combination of HCG, MT, E2, and antidopamine

American Eel Fecundity and Ovary Maturation in Relation to Body Size and Geographic Distribution

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