Determination of moult stage in the South African West Coast rock lobster
            <i>Jasus lalandii</i>
            (h. Milne Edwards) (Crustacea: Decapoda)

Isaacs, G.; Cockcroft, A. C.; Gibbons, M. J.; Villiers, C.J. de

doi:10.2989/025776100784125799

Cited by 6 publications

(8 citation statements)

References 11 publications

(37 reference statements)

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“…This situation of "irreconcilable" datasets from the same crustacean species (see table II) is interesting and unexpected, and may be explained by inherent differences between juveniles that ecdyse several times a year and adults that ecdyse only once a year. Thus far, moult stage-specific changes have not been reported on for both developmental stages in other decapod species to substantiate or refute the observed differences encountered in the current study and that of Isaacs et al (2000). On the other hand, the differences set out in table II may simply be the result of different interpretations by the authors of setogenic events.…”

Section: Discussioncontrasting

confidence: 79%

“…1. These observations are in direct agreement with those of Lyle & MacDonald (1983) who looked at setogenesis in the warm water palinurid Panulirus marginatus (Quoy & Gaimard, 1825) and disagree with the observations/information put forward by Isaacs et al (2000) on juvenile /. lalandii specimens (carapace length 20-45 mm).…”

Section: Discussionsupporting

confidence: 77%

“…Drach (1939) divided the moult cycle of decapod crustaceans into four phases, viz., metecdysis (postmoult), anecdysis (intermoult), proecdysis (premoult) and ecdysis (moulting), and devised a method for distinguishing these different phases based on microscopic changes in the integument. The original scheme has since been adapted and modified for several different decapods to accommodate species-and infraorder-specific morphological differences during the moult cycle, for example (and by no means an exhaustive list): crab (Moriyasu & Mallet, 1986), American lobster (Aiken, 1973), spiny lobster (Lyle & McDonald, 1983;Isaacs et al, 2000), crayfish (Mills & Lake, 1975;Stevenson et al, 1979), prawn (Penaeidae: Longmuir, 1983;Chan et al, 1988;Promwikom et al, 2007) and shrimp (Palaemonidae: Ereeman & Bartell, 1975;Peebles, 1977).…”

Section: Introductionmentioning

confidence: 99%

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The moult cycle of Jasus lalandii (H. Milne Edwards, 1837) (Decapoda, Palinuridae), a cold water spiny lobster species: changes in ecdysteroid titre and setogenesis

Marco

2012

Crustac

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The moult cycle of the South African spiny lobster Jasus lalandii (H, Milne Edwards, 1837) was investigated with respect to ecdysteroid concentration in the haemolymph and morphological changes evident in pleopods of individual adult specimens. The morphological changes (observed by hght microscopy) in pleopods from the adult specimens are clearly different to those previously published for juvenile J. lalandii, and thereby, alters the interpretation of moult stages. The repeated simultaneous sampling of haemolymph (for measuring 20-hydroxyecdysone via an enzymeimmunoassay) and a pleopod from captive specimens, allow for determining the underlying endocrine activity at each moult stage and a conservative estimate of the duration of some of the moult stages. The resulting pattern suggests that adult /, lalandii may spend more time in premoult than in intermoult, thus hinting that these cold water spiny lobsters may not have a terminal moult. Finally, not all hormonal changes are reflected by morphological changes. ZUSAMMENFASSUNGDer Häutungszyklus der südafrikanischen Languste, Jasus lalandii (H, Milne Edwards, 1837), wurde in erwachsenen Individuen in Hinsicht auf die Konzentration von Ecdysteroiden in der Hâ-molymphe und ebenfalls in Hinsicht auf morphologische Veränderungen der Pleopoden untersucht. Die morphologischen Veränderungen der Pleopoden erwachsener Individuen, die mittels Lichtmikroskopie beobachtet wurden, unterscheiden sich deutlich von solchen, die früher für juvenile Tieren von / lalandii publiziert wurden. Daher sind die Interpretationen der einzelnen Häutungssta-dien auch unterschiedlich definiert in jungen und erwachsenen Tieren, Die wiederholte und gleichzeitige Entnahme von Hämolymphe (um den Gehalt an 20-Hydroxyecdyson mittels Enzymimmuntest zu messen) und Untersuchung des Pleopoden eines Individuums erlaubt sowohl die Bestimmung der zugrundeliegenden Hormonaktivität jedes Häutungsstadiums als auch eine konservative Schätzung der Dauer des einiger Häutungsstadien, Als Ergebnis scheint sich abzuzeichnen, dass erwachsene J. lalandii Individuen längere Zeit im Vorhäutungsstadium verbringen als im Zwischenhäutungsstadium, Dieses Ergebnis lässt vermuten, dass diese Kaltwasserlanguste keine letzte Häu-tung hat, sondern sich immer wieder häutet, Ausserdem geht aus dieser Studie hervor, dass sich nicht alle hormonellen Veränderungen in morphologischen Veränderungen widerspiegeln. 1)

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Section: Discussioncontrasting

confidence: 79%

Section: Discussionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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The moult cycle of Jasus lalandii (H. Milne Edwards, 1837) (Decapoda, Palinuridae), a cold water spiny lobster species: changes in ecdysteroid titre and setogenesis

Marco

2012

Crustac

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“…For each of these experiments, three collections were made at sea: during August 2002-2003 to obtain late intermoult or premoult lobsters (defined as premoults for the purposes of this study), and during November 2003 to obtain early intermoult lobsters (defined as intermoults). Moult stages of lobster were confirmed by pleopod analysis according to the methods described for this species by Isaacs et al (2000). For the in situ experiment, 6000 lobsters caught with traps from a research ship were tagged and released, 3000 at Knol and 3000 at Olifantsbos in August andSeptember 2002, andagain in 2003. Aquaria consisted of eight rectangular fibreglass tanks (2 m × 2.5 m × 1.5 m), with a continuous flowthrough system supplied by seawater pumped from an inlet offshore from the aquarium facility.…”

Section: Collection Of Samples and Experimental Treatmentmentioning

confidence: 99%

Effects of tag-related injuries and timing of tagging on growth of rock lobster, Jasus lalandii

Dubula¹,

Groeneveld²,

Santos

et al. 2005

Fisheries Research

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“…Each had substages. This general scheme has been widely adopted and applied to a variety of crustaceans, including cray sh (Stevenson et al, 1968;Mills & Lake, 1975;Peebles, 1977;Van Herp & Bellon-Humbert, 1978), lobsters (Aiken, 1973;Dall & Barclay, 1977;Lyle & MacDonald, 1983;Turnbull, 1989;Isaacs et al, 2000), and prawns (Smith & Dall, 1985).…”

mentioning

confidence: 99%

Development of a Pleopod Index to Assess the Moulting Season of Rock Lobster, Palinurus Gilchristi (Decapoda, Palinuridae) Off South Africa

Groeneveld¹

2001

Crustac

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The setagenic development of the pleopods of rock lobster Palinurus gilchristi was investigated as a method to identify moult stages and de ne a moulting season. Seven discrete moulting stages and substages were found in captive lobsters. A premoult D 0 stage was followed by a D 1 0 stage 30-46 days prior to moulting, progressing to stages D 1 000 (23-24 days before moulting) and D 2 (covering a 2-week period prior to moulting). The post-moult stages A (2 days) and B (»1 week) were short, and an early intermoult C stage was observed after 11 days. Analyses of monthly eld samples using the above pleopod stages indicated that the proportions of premoult lobsters in catches peaked in September (25%), October (35%) and November (22%). This con rms results from tagging, which show an increase in the proportions of small (<70 mm CL) postmoult lobsters in catches in October (43%), November (60%), and December (98%), and in large (>70 mm CL) postmoult lobsters in December (61%). Shell-condition re ected low proportions of recently-moulted soft-shelled lobsters in samples throughout the study, the only exception being males in December (22%). This study presents the rst application of pleopod setagenesis to rock lobsters of the genus Palinurus. RÉSUMÉLe développement sétogène des pléopodes de la langouste Palinurus gilchristi a été étudié comme méthode pour identi er les stades de mue et dé nir une saison de mue. Sept stades et sous-stades discrets de mues ont été trouvés chez les langoustes en captivité. Un stade de prémue D 0 est suivi d'un stade D 1 0 de 30-46 jours avant la mue, jusqu'aux stades D 1 000 (23-24 jours avant la mue) et D 2 (sur une période de 2 semaines avant la mue). Les stades post-mues A (2 jours) et B (»1 semaine) sont courts, et un stade C d'intermue a été observé après 11 jours. Les analyses d'échantillons de terrain mensuels utilisant les stades pléopodes ci-dessus ont indiqué que les proportions de langoustes en prémue atteignaient un pic en septembre (25%), octobre (35%) et novembre (22%). Ceci con rme les résultats du marquage, qui montrent une augmentation dans les proportions de petites (<70 mm CL) langoustes en postmue dans les prises d'octobre (43%), novembre (60%) et 3 /

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Determination of moult stage in the South African West Coast rock lobster Jasus lalandii (h. Milne Edwards) (Crustacea: Decapoda)

Cited by 6 publications

References 11 publications

The moult cycle of Jasus lalandii (H. Milne Edwards, 1837) (Decapoda, Palinuridae), a cold water spiny lobster species: changes in ecdysteroid titre and setogenesis

The moult cycle of Jasus lalandii (H. Milne Edwards, 1837) (Decapoda, Palinuridae), a cold water spiny lobster species: changes in ecdysteroid titre and setogenesis

Effects of tag-related injuries and timing of tagging on growth of rock lobster, Jasus lalandii

Development of a Pleopod Index to Assess the Moulting Season of Rock Lobster, Palinurus Gilchristi (Decapoda, Palinuridae) Off South Africa

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