Reproductive efficiency of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) at different densities under both culture and laboratory conditions

Celada, J.D.; Antolín, J.I.; Carral, J.M.; Pérez, José Ramón Rodríguez; Sáez‐Royuela, M.

doi:10.1016/j.aquaculture.2005.06.049

Cited by 4 publications

(7 citation statements)

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“…In the latter case, 77.4% of the females initially introduced in the ponds had eggs close to hatching in April, with an estimated mean of 225 eggs per female. These results are similar to 74% of berried females with a mean of 228 eggs recorded in a previous experiment also carried out in earthen ponds (Celada et al 2005b). …”

Section: Discussionsupporting

confidence: 90%

“…In A. leptodactylus, Kö ksal (1988) reported that egg-bearing females collected from a wild population and from earthen ponds yielded in hatching tanks 76.9 and 104.8 stage 2 juveniles per female respectively. In P. leniusculus, from the broodstock maintained in earthen ponds and transferred to the hatchery in April, Celada et al (2005b) estimated a production of 190 stage 2 juveniles per female. In the present experiment with the same species, juvenile production by the females kept in ponds can be estimated by applying the percentage of losses recorded from the eggs close to hatching (XIII-XIV) to the juvenile stage 2 (16.6%) by Celada et al (2005b).…”

Section: Discussionmentioning

confidence: 99%

“…The experiment covered the period from maturation until the eggs reached phases XIII-XIV (embryo with strongly developed eye pigment to embryo with strongly developed posterior liver lobes), close to hatching, when egg-bearing females were transferred to the hatchery. At this moment, in accordance with Taugbøl and Skurdal (1990b), Mackeviciené et al (1999) and Celada et al (2005b), females were divided into four groups, on the basis of the estimated total number of pleopodal eggs: Group I-250 ± 50 eggs, Group II-150 ± 50, Group III-under 100 (mean around 75) and Group IV-no eggs. Embryonic stages were identified in accordance with the techniques developed by Celada et al (1985Celada et al ( , 1987.…”

Section: Methodsmentioning

confidence: 98%

“…A suitable sex ratio (around 1 male to 2.8 females) and density (around 4.7 animals/m 2 ) were established according to Celada et al (2005aCelada et al ( , 2005b. The mating and spawning periods were estimated by daily observation of the ponds.…”

Section: Methodsmentioning

confidence: 99%

“…Crayfish farming is also strongly dependent on adults from natural habitats every reproductive cycle. Up to now, several reproductive studies have been carried out on different astacid species in captivity: Astacus astacus L. (Cukerzis et al 1979;Pursiainen et al 1983;Taugbøl and Skurdal 1989, 1990a, 1990bMackeviciené et al 1997Mackeviciené et al , 1999Policar et al 2004), Pacifastacus leniusculus Dana (Mason 1974(Mason , 1977Celada et al 1988Celada et al , 2005aCelada et al , 2005bPursiainen et al 1989;Savolainen et al 1997), Austropotamobius pallipes Lereboullet (De Luise and Sabbadini 1988;Pé rez et al 1999;Carral et al 1994Carral et al , 2000Celada et al 2001) and Astacus leptodactylus Eschscholtz (Kö ksal 1988). Only Savolainen et al (1997) mention that one of the eight populations studied consisted of a mixture of females trapped from natural lakes and females born under culture conditions, and the only information given is the number of ovarian eggs in a sample of females, without separating the two different origins.…”

Section: Introductionmentioning

confidence: 97%

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Effects of breeder reuse on the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) in culture

et al. 2006

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The aim of this work was to evaluate the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana) in the second cycle under culture conditions. The experiment was carried out using 5,653 animals placed in six earthen ponds in August. Three treatments were performed, each in two ponds: breeder reuse (males and females used in the former reproductive cycle), female reuse (new males from the wild and females used in the former reproductive cycle) and new breeders (males and females from the wild). In April, close to hatching, egg-bearing females were transferred to the hatchery. Mortality of the reused breeders (around 30% of females and 41.4% of males) was significantly higher than that of the new breeders (11.4% of females and around 19.5% of males). The proportion of berried females close to hatching was significantly higher for the new ones (77.4% of the initial number), and the percentage of new females with a large quantity of eggs (63.6%) was higher than that of the reused females (25.6 and 20.9%). Differences among the percentages of females without eggs in the new breeders (11.2%) and the rest of the treatments (30.7 and 39.6%) were significant. The reproductive capacity of reused females was not improved by providing new males. Considering the number of females initially stocked into ponds, mean yield per new female was greater than that of the reused females, mainly due to the higher mortality recorded in the reused broodstock. Although the yield that can be obtained using the same breeders in two reproductive cycles drops in the second one, the production was not negligible.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Effects of breeder reuse on the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) in culture

et al. 2006

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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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Logit models for evaluating spawning performance of channel catfish, Ictalurus punctatus (Rafinesque)

2007

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Broodstock evaluations are often measured by variables such as spawning success, fecundity, fertilization and hatching rates, usually expressed as percentage values. Outcomes are generally analysed as continuous random variables, assuming that they follow a normal distribution. Ordinary linear regression models (e.g. analysis of variance) as well as w 2 analysis are typically applied. However, these models may not be the most appropriate as a number of test criteria may not be met. For example, spawning success outcomes are inherently discrete and non-negative data and hence their distribution is not likely to be normal. As these models may not be the most appropriate, a case study using logit analysis as an alternative method for the evaluation of this type of data is presented by considering the response as binary data (spawned versus did not spawn). An exact version of logit analysis was performed due to the sparseness of the data. The results demonstrate that appropriate statistical models provide better insight into the cause^e¡ect relationships that exist between control variables and the dependent variable (likelihood of spawning in this case). As would be expected, each strain of ¢sh responded somewhat di¡erently to the test variables. Changing the protein level of the diet from 32% to 42% or increasing the feeding frequency from three to six times per week either did not in£uence spawning or negatively a¡ected spawning respectively. Additionally, older ¢sh performed better than younger ¢sh and the early spawning period was better than the later spawning period, regardless of strain. These responses, however, were only detected using logit analysis, which is a more sensitive test and would thus be recommended for this type of data.

show abstract

Reproductive efficiency of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) at different densities under both culture and laboratory conditions

Cited by 4 publications

References 14 publications

Effects of breeder reuse on the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) in culture

Effects of breeder reuse on the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana. Astacidae) in culture

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

Logit models for evaluating spawning performance of channel catfish, Ictalurus punctatus (Rafinesque)

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