On Selected Morphomechanical Characteristics of Signal Crayfish (Pacifastacus Leniusculus Dana) Eggs During Incubation

Winnicki, Aleksander; Pawlos, Dorota; Formicki, Krzysztof; Śmietana, Przemysław

doi:10.1051/kmae:2004016

Cited by 7 publications

(9 citation statements)

References 4 publications

(4 reference statements)

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“…This is much lower than for the noble crayfish, where the estimated requirement for hatching in nature is approximately 240 days (1,500 CTU), (CUKERZIS, 1973;TAUGBØL and SKURDAL, 1990). MASSON (1977), HOFMANN (1980), WINNICKI et al (2004), andCELADA et al (2005a,b) stated that 906-1,380 CTU are needed for embryonic development in the signal crayfish, which is still higher than values recorded in our experiment for the spiny-cheek crayfish. The requirement of higher CTU for egg development in European crayfish in comparison with the spiny-cheek crayfish is evident even if we take into account the artificially shortened incubation times under laboratory conditions (HESSEN et al, 1987;PÉREZ et al, 1998;CARRAL et al, 2004;POLICAR et al, 2004).…”

Section: Discussioncontrasting

confidence: 58%

The Fecundity, Time of Egg Development and Juvenile Production in Spiny-Cheek Crayfish (Orconectes Limosus) Under Controlled Conditions

Kozák

Buřič

Policar

2006

Bull. Fr. Pêche Piscic.

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We comprehensively describe the fecundity and time of embryonic development of the spiny-cheek crayfish (Orconectes limosus). Linear relationships between female size and ovarian fecundity, pleopodal fecundity, and production of juveniles at the 3 rd stage, were confirmed. The ovarian fecundity was evaluated for the smallest as well as largest females in the sampled population (43-93 mm of body length); the number of oocytes (eggs) ranged widely, between 46 and 505. No significant difference was found between the ovarian and pleopodal fecundity observed just after egg laying. The value of the female gonadosomatic index just before laying was 4.2 ± 1.8% (0.8-7.7%). The mean diameter of eggs on female pleopods was 1.8 ± 0.2 mm (1.45-2.15 mm). A statistically significant difference was found between the numbers of eggs carried on individual pairs of pleopods. Mean time from laying to hatching was 46 ± 3.8 days (37-56 days), i.e. 647 ± 39.9 CTU (Celsius Temperature Units = degrees Celsius × days). Mean production of juveniles at the 3 rd stage was found to be 135.7 ± 67.24 (15-243) juveniles. The early sexual maturation and also high number of juveniles at the 3 rd stage per female gives this species a good predisposition for quick establishment in new localities. Key-words:Crayfish, Orconectes limosus, lifecycle, Czech Republic, juveniles, egg development. LA FÉCONDITÉ, LA DURÉE DU DÉVELOPPEMENT EMBRYONNAIRE ET LA PRODUCTION DE JUVÉNILES CHEZ L´ÉCREVISSE AMÉRICAINE (ORCONECTES LIMOSUS) DANS UN ENVIRONNEMENT CONTRÔLÉ RÉSUMÉCette étude décrit en détail la fécondité et la durée de développement embryonnaire de l´écrevisse américaine (Orconectes limosus) et confirme le rapport direct entre la taille de la femelle, la fécondité ovarienne, pléopodale et la production de juvéniles au stade 3. La fécondité ovarienne a été évaluée pour les femelles les plus petites aussi bien que pour les plus grandes femelles de la population échantillonnée (longueur corporelle de 43 à 93 mm). Bull. Fr. Pêche Piscic. (2006) 380-381 : 1171-1182 -1172 -significative entre la fécondité ovarienne et la fécondité pléopodale, observées juste après la ponte. La valeur de l´indice gonadosomatique (I.G.S.) trouvée juste avant la ponte est de 4,2 ± 1,8 % (0,8-7,7 %) pour les femelles et de 0,3 ± 0,05 % (0,2-0,4 %) pour les mâles. Le diamètre moyen des oeufs sur les pléopodes des femelles était de 1,8 ± 0,2 mm (1,45-2,15 mm). Le nombre d'oeufs sur les paires individuelles de pléopodes était très variable (95 à 492). La durée moyenne entre la ponte et l'éclosion était de 46 ± 3,8 jours (37 à 56 jours), i.e. 647 ± 39,9° Celsius × jour (543 à 730). La production moyenne de juvéniles au stade 3 fut de 135,7 ± 67,24 (15 à 243) juvéniles. La maturité sexuelle plus précoce et le grand nombre de juvéniles de stade 3 produits par femelles donnent à cette espèce une prédisposition à occuper plus rapidement de nouveaux sites.

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Section: Discussioncontrasting

confidence: 58%

The Fecundity, Time of Egg Development and Juvenile Production in Spiny-Cheek Crayfish (Orconectes Limosus) Under Controlled Conditions

Kozák

Buřič

Policar

2006

Bull. Fr. Pêche Piscic.

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“…Egg case strength was measured, to 0.1 g, with a specially designed device with in-built software that recorded the maximum pressure the case was able to withstand. Methods of egg volume and strength measurements were described in detail by Winnicki et al (2004).…”

Section: Methodsmentioning

confidence: 99%

“…Morphomechanical properties of Pacifastacus leniusculus (Dana, 1852) eggs during embryogenesis were studied by Winnicki et al (2004), who found a constant increase of egg size (volume and surface) throughout embryonic development, the increase resulting from the uptake of water from the surrounding medium. The size increase was accompanied by a reduction in the strength of the egg cases.…”

Section: Introductionmentioning

confidence: 99%

Hatching Process in the Signal Crayfish, Pacifastacus Leniusculus (Dana, 1852) (Decapoda, Astacidae)

Pawlos¹,

Korzelecka-Orkisz

Formicki

et al. 2010

Crustac

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The need to elucidate the hatching process in the signal crayfish, Pacifastacus leniusculus, emerged as a result of the paucity of information on hatching mechanisms, perivitelline space, and egg hydration during embryonic development.To elucidate morphomechanical changes in the eggs during embryonic development of the signal crayfish, egg diameter and egg case strength were measured. Embryogenesis itself and hatching mechanisms were observed on live eggs in a special apparatus (a microscope coupled with a digital camera, a computer, and a video-recorder). Changes in egg case structure during embryogenesis and during hatching were analysed using light and scanning electron microscopy.During the period of observation, the eggs were found to continuously increase in volume, from an initial value of 8.87 ± 0.376 to 12.25 ± 0.371 mm 3 at hatching. The egg case strength was initially considerable and exceeded 107.7 ± 11.43 g. It was, however, observed to decrease with time to 38.6 ± 15.34 g of hatching.In addition, the structure of the egg case was observed, just before hatching, to loose its integrity mainly by local absence of the inner layer. On hatching, the case would break down along the embryo's cephalothorax, where it was most conspicuously stretched. RÉSUMÉLa nécessité d'étudier le processus d'incubation chez l'écrevisse « signal », Pacifastacus leniusculus, est apparue du fait du manque d'information sur le mécanisme de l'éclosion et le processus de formation de l'espace péri vitellin et des relations hydriques au cours de développement embryonnaire.Pour élucider les changements morpho-mécaniques des oeufs de l'écrevisse signal pendant son développement embryonnaire, le diamètre des oeufs et la résistance de l'enveloppe de l'oeuf ont été mesurés. L'embryogénèse et le mécanisme de l'éclosion ont été observés sur des oeufs vivants à l'aide

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“…Its capability, high fertility, fast growth, unisexuality and isogenic progeny (Scholtz et al, 2003;Martin et al, 2007) have made this species useful for physiological, ecological, evolutionary and genetic studies. Crayfish eggs, as those of decapod crustaceans in general, are encased by an inner vitelline membrane and a chorion (Winnicki et al, 2004) although the exact sequence and number of layers and their origin is debated (Cheung, 1966) termined according to the system developed by Alwes and Scholtz (2006).…”

Section: Sample Materialsmentioning

confidence: 99%

Experimental mineralization of crustacean eggs: new implications for the fossilization of Precambrian–Cambrian embryos

Hippler

Steiner

et al. 2012

Biogeosciences

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Abstract. Phosphatized globular microfossils from the Ediacaran and lower Cambrian of South China represent an impressive record of early animal evolution and development. However, their phylogenetic affinity is strongly debated. Understanding key processes and conditions that cause exceptional egg and embryo preservation and fossilization are crucial for a reliable interpretation of their phylogenetic position. We conducted phosphatization experiments on eggs of the marbled crayfish Procambarus that indicate a close link between early mineralization and rapid anaerobic decay of the endochorional envelope. Our experiments replicated the different preservational stages of degradation observed in the fossil record. Stabilization of the spherical morphology was achieved by pre-heating of the eggs. Complete surface mineralization occurred under reduced conditions within one to two weeks, with fine-grained brushite (CaHPO 4 · 2H 2 O) and calcite. The mechanisms of decay, preservation of surface structures, and mineral replacement in the experiment were likely similar during fossilization of Cambrian embryos.

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On Selected Morphomechanical Characteristics of Signal Crayfish (Pacifastacus Leniusculus Dana) Eggs During Incubation

Cited by 7 publications

References 4 publications

The Fecundity, Time of Egg Development and Juvenile Production in Spiny-Cheek Crayfish (Orconectes Limosus) Under Controlled Conditions

The Fecundity, Time of Egg Development and Juvenile Production in Spiny-Cheek Crayfish (Orconectes Limosus) Under Controlled Conditions

Hatching Process in the Signal Crayfish, Pacifastacus Leniusculus (Dana, 1852) (Decapoda, Astacidae)

Experimental mineralization of crustacean eggs: new implications for the fossilization of Precambrian–Cambrian embryos

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