Swim Bladder Volume Maintenance Related to Initial Oceanic Migratory Depth in Silver-Phase
            <i>Anguilla rostrata</i>

Kleckner, Robert C.

doi:10.1126/science.7384792

Cited by 57 publications

(52 citation statements)

References 2 publications

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“…Artificially matured Anguilla anguilla released in the Sargasso Sea did not descend beyond 300 m (Fricke & Kaese 1995), while partially matured A. japonica swam at mean depths ranging from 81 to 172 m (Aoyama et al 1999b). Experimental evidence from maintenance of swimbladder volume (Kleckner 1980) and temperatures required for gonad maturation (Boetius & Boetius 1967) are also consistent with migration and spawning within 200 m of the surface. Although depth was not recorded during the present study, the fact that light levels could be recorded on most days indicated that eels remained within the euphotic zone, at least during daylight hours.…”

Section: Swimming Depthmentioning

confidence: 73%

First use of archival transmitters to track migrating freshwater eels Anguilla dieffenbachii at sea

Jellyman¹,

Tsukamoto²

2002

Mar. Ecol. Prog. Ser.

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The spawning grounds of the New Zealand longfinned eel Anguilla dieffenbachii are unknown, but thought to be in the tropical region of the south Pacific Ocean. To determine whether pop-up tags could be used to provide information on the swimming speed and direction of migrating eels at sea, 4 female eels (7 600 to 11 400 g) were equipped with archival pop-up tags that were preprogrammed to surface after either 2 or 3 mo. All 4 tags ascended successfully at straight-line distances ranging from 368 to 1000 km offshore of the east coast of South Island, New Zealand. These estimated migration pathways showed that the eels moved substantial distances along inshore areas before moving offshore and eastward. There was no evidence of the expected northeast movement to tropical waters. Average swimming speed of all eels ranged from 15.1 to 31.3 km d

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Section: Swimming Depthmentioning

confidence: 73%

First use of archival transmitters to track migrating freshwater eels Anguilla dieffenbachii at sea

Jellyman¹,

Tsukamoto²

2002

Mar. Ecol. Prog. Ser.

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“…Ce stade est non seulement caractérisé par un changement de couleur de la peau mais aussi par des modifications au niveau de la musculature (PANKHURST, 1982b), du tractus digestif (SORENSEN et PANKHURST, 1988), des branchies (FONTAINE et al, 1995), de la vessie natatoire (KLECKNER, 1980 ;KLECKNER et KRUEGER, 1981), des organes sensoriels (PANKHURST, 1982a ;PANKHURST et LYTHGOE, 1983) et des gonades (FONTAINE, 1989 ;FONTAINE et DUFOUR, 1991 ;DUFOUR, 1994). Cette métamorphose qu'est l'argenture se mettrait en place pour des tailles corporelles moyennes supérieures à 35 cm chez les mâles et à 45 cm chez les femelles (pour revue : LECOMTE-FINIGER, 1990).…”

Section: Key-wordsunclassified

Étude des variations de paramètres anatomiques et endocriniens chez l'anguille européenne (Anguilla anguilla) femelle, sédentaire et d'avalaison : application à la caractérisation du stade argenté

Marchelidon

Belle

Hardy

et al. 1999

Bull. Fr. Pêche Piscic.

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-350 -Parmi les paramètres endocriniens étudiés, seule la teneur hypophysaire en GtH permet de caractériser l'argenture. La teneur en GtH s'élève progressivement au cours du stade jaune, de façon corrélée avec le RGS, puis s'accroît fortement à l'argenture (x 25), une valeur seuil > 15 ng/hypophyse permettant de caractériser le stade argenté. La teneur hypophysaire en G H augmente au cours du stade jaune de façon corrélée avec la longueur du corps. La teneur en GH baisse à l'argenture (x 0,5), mais le recoupement des valeurs individuelles ne permet pas d'utiliser ce critère. Le taux circulant d'hormone thyroïdienne T 4 augmente à l'argenture (x 1,38) mais avec un large recoupement des valeurs individuelles. Le taux de T 3 ne varie pas à l'argenture.En conclusion, l'argenture inclut des transformations multiples, caractéristiques aussi bien de la métamorphose (augmentation de T 4 ), de l'initiation de la puberté (augmentations du RGS et de GtH), du jeûne (diminution du RTDS) et de l'arrêt de croissance (diminution de GH). Certains paramètres anatomiques (IO, RGS, RTDS), et endocriniens (GtH), qui présentent très peu de recoupement dans les valeurs individuelles entre les stades jaune et argenté, sont utilisables comme critères de l'argenture.Mots-clés : anguille européenne, Anguilla anguilla, argenture, index oculaire, ovaires, tractus digestif, hormone gonadotrope, GtH, hormone de croissance, GH, hormones thyroïdiennes, T 3 , T 4 . STUDY OF VARIATIONS OF ANATOMICAL AND ENDOCRINE PARAMETERS IN SEDENTARY AND DOWNSTREAM MIGRATING FEMALE EUROPEAN EELS (ANGUILLA ANGUILLA) : APPLICATION TO THE CHARACTERIZATION OF THE SILVER STAGE. ABSTRACTSilvering process in eels is a complex transformation from the sedentary phase of juvenile growth (yellow stage) to the downstream migratory phase (silver stage), which is the initial step of the reproductive oceanic migration. The present comparative study was performed on batches of sedentary or migratory female eels, body length > 45 cm, caught in natural environment. We looked for criteria of silver stage by combining, for the first time, endocrine parameters to anatomical ones. Anatomical parameters included external characteristics (body weight, body length, ocular index, Ol) and internal ones (gonadosomatic index, GSI, digestive tract-somatic index, DTSI). Endocrine parameters included hormones implicated in metamorphosis (thyroid hormones, T 3 and T 4 ), growth (growth hormone, GH) and reproduction (gonadotropic hormone, GtH).Sedentary eels show a progressive development of ovaries, correlated to body growth. GSI further increases in downstream migratory eels (x 2.85), a threshold value > 1,4 % characterizing the silver stage. The enlargement of the eyes also is a progressive phenomenon, initiated at the yellow stage in correlation to the GSI. As well as for GSI, Ot further increases in migratory eels (x 2), a threshold value > 8 being proposed as an external criterion of silvering. Regression of the digestive tract is not initiated at the yellow stage and occurs at silvering...

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“…These changes are thought to be adaptations for their oceanic spawning migration (Kleckner, 1980;Pankhurst and Lythgoe, 1982;Pankhurst and Lythgoe, 1983;Tsukamoto, 2009). However, not all eels that migrate downstream show the obvious external characteristics of silver eels (Vøllestad et al, 1986;Haro, 2003;Winter et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Inhibitory Effects of Testosterone on Downstream Migratory Behavior in Masu Salmon, Oncorhynchus masou

Munakata¹,

Amano

Ikuta

et al. 2000

Zoological Science

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Swim Bladder Volume Maintenance Related to Initial Oceanic Migratory Depth in Silver-Phase Anguilla rostrata

Cited by 57 publications

References 2 publications

First use of archival transmitters to track migrating freshwater eels Anguilla dieffenbachii at sea

First use of archival transmitters to track migrating freshwater eels Anguilla dieffenbachii at sea

Étude des variations de paramètres anatomiques et endocriniens chez l'anguille européenne (Anguilla anguilla) femelle, sédentaire et d'avalaison : application à la caractérisation du stade argenté

Inhibitory Effects of Testosterone on Downstream Migratory Behavior in Masu Salmon, Oncorhynchus masou

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