Live feed as supplement from the onset of external feeding of juvenile signal crayfish (Pacifastacus leniusculus Dana. Astacidae) under controlled conditions

Sáez‐Royuela, M.; Carral, J.M.; Celada, J.D.; Pérez, José Ramón Rodríguez; González, Á.

doi:10.1016/j.aquaculture.2007.04.053

Cited by 22 publications

(36 citation statements)

References 13 publications

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“…However, when the same feeding conditions have been tested in juveniles from the start of independent life (stage 2), survival and growth rates drastically decreased (see review by González et al, 2008). This fact has been mainly attributed to a nutritional deficiency related to unknown essential factors that can be provided by live Artemia nauplii or Daphnia (Sáez-Royuela et al, 2007) or decapsulated Artemia cysts (González et al, 2009). The present results show that need for these factors could be satisfied once juveniles have received decapsulated Artemia cysts for an initial period of 20 days, since longer supplies did not improve the survival.…”

Section: Discussionmentioning

confidence: 99%

“…Among them, several trials have shown that the supply of dry diets as the sole food from the onset of exogenous feeding yields poor survival or growth rates (e.g. Ackefors et al, 1989;Taugbøl and Skurdal, 1992;Celada et al, 1993;Ulikowski et al, 2006;Sáez-Royuela et al, 2007). Recently, acceptable survival and growth rates were recorded by means of the additional supply of live Artemia nauplii to a commercial dry diet for salmonids (Sáez-Royuela et al, 2007;González et al, 2008), thus allowing for the first time reliable possibilities of intensification.…”

Section: Introductionmentioning

confidence: 99%

“…Ackefors et al, 1989;Taugbøl and Skurdal, 1992;Celada et al, 1993;Ulikowski et al, 2006;Sáez-Royuela et al, 2007). Recently, acceptable survival and growth rates were recorded by means of the additional supply of live Artemia nauplii to a commercial dry diet for salmonids (Sáez-Royuela et al, 2007;González et al, 2008), thus allowing for the first time reliable possibilities of intensification. Later, González et al (2009) advised the use of decapsulated Artemia cysts instead of nauplii, as they can support a faster crayfish growth and their production offers important advantages.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the scarcity of information on the nutritional requirements of juvenile astacids in their first stages, available dry diets are ineffective as the sole food. Thus, the additional supply of live feeds such as Artemia, which would constitute the source of unknown factors (Sáez-Royuela et al, 2007), still remains indispensable under controlled conditions. At this point, it should be considered that both cost and work could be reduced by means of restricting the supply periods of Artemia cysts.…”

Section: Introductionmentioning

confidence: 99%

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Additional supply of decapsulatedArtemiacysts for various periods in intensive rearing of juvenile crayfish (Pacifastacus leniusculus, Astacidae)

González

Celada

Carral

et al. 2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words: astacid crayfish, juvenile, feeding, stocking densityThe additional supply of live feeds such as Artemia remains indispensable in juvenile astacid rearing from the start of independent life. Considering that cost and work could be reduced by restricting this supply, a 100-day experiment was carried out with stage 2 Pacifastacus leniusculus to evaluate the effects of different administration periods of decapsulted Artemia cysts as supplement to a dry diet at two stocking densities. Using a bifactorial design, six treatments differing in the time at which the cysts were withdrawn (after 20, 30 or 50 days of experiment) and the stocking density (100 or 200 crayfish·m −2 ) were conducted. Survival rates did not show significant differences among groups, with final figures averaging 81%. Crayfish receiving cysts up to day 50 showed faster growth (around 13.8 mm carapace length and 610 mg weight at the end of the experiment) than the rest, significant differences being recorded from day 60 of experiment onwards. The 20-day and 30-day supplies resulted in similar growth values. There were no significant differences in survival or growth between 100 and 200 crayfish·m −2 . This study shows that decapsulated Artemia cysts can be withdrawn at day 20 (allowing to feed a dry diet as the sole food thereafter) and that faster growth can be obtained if cysts are supplied up to day 50. Furthermore, a stocking density of 200 crayfish·m −2 can be advised under the mentioned feeding conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Additional supply of decapsulatedArtemiacysts for various periods in intensive rearing of juvenile crayfish (Pacifastacus leniusculus, Astacidae)

González

Celada

Carral

et al. 2011

Knowl. Managt. Aquatic Ecosyst.

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“…A wide variety of natural foods (mainly fresh or frozen animals and vegetables) and feedstuffs formulated for other aquatic species either alone or supplemented with natural foods (see review by González R. et al, 2009a) have been tested to improve survival and growth rates of astacid juveniles from the onset of exogenous feeding. However, acceptable results have been only obtained by supplying live feed such as Daphnia or Artemia nauplii (Sáez-Royuela et al, 2007;González À. et al, 2008González À. et al, , 2011González R. et al, 2009a). Recently, González R. et al (2009b) proved that decapsulated Artemia cysts can be better supplement than live nauplii, since cysts improve the performance of juvenile crayfish, allowing a reduction of labour and costs.…”

Section: Introductionmentioning

confidence: 99%

Proposal of a practical diet for juvenile astacid crayfish studies from the onset of exogenous feeding under controlled conditions

Carral

González

Celada

et al. 2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words: astacid, juvenile, feeding, practical dietConsidering the knowledge on freshwater crayfish feeding requirements and other cultured crustaceans, a practical extruded diet was formulated with the aim to be used for juvenile astacid studies from the onset of exogenous feeding. According to a bifactorial design, the practical diet was compared with the diet which has allowed repeated good survival and growth results (control: feedstuff for trout combined with Artemia cysts) in groups and individually isolated crayfish in an 80-day experiment. Diets tested did not affect final survival rates and growth neither in grouped nor in isolated crayfish, being the highest survival rate (average: 93%) and growth values (average: 13.2 mm carapace length: CL, 578.1 mg weight: W, 3.52%·d −1 specific growth rate: SGR, 1896.6% weight gain: WG) reached with the practical diet. Survival rates did not show significant differences neither among crayfish maintained in groups (86% for the practical diet and 81.7% for the control diet) nor among isolated crayfish (100% survival). Isolated crayfish had significantly higher growth (14.3 mm CL, 760 mg W) than the grouped crayfish (11.5 mm CL, 354 mg W). Results show the feasibility of the proposed practical diet as basis for further studies on astacid crayfish. RÉSUMÉProposition d'une nourriture pratique pour les études de juvéniles d'écrevisses dès la prise de nourriture exogène sous conditions contrôlées Mots-clés :astacidé, juvénile, alimentation, nourriture pratique Étant donné les connaissances sur les besoins alimentaires des écrevisses d'eau douce et d'autres crustacés élevés, une nourriture extrudée pratique a été formulée dans le but d'être utilisée pour les études sur les juvé-niles d'astacidés dès la prise de nourriture exogène. Selon un dispositif bifactoriel, la nourriture a été comparée à une alimentation qui a permis de bonnes survie et croissance (contrôle : nourriture pour truite avec des cystes d'Artemia) dans des expérimentations de 80 jours sur individus isolés ou en groupe. Les alimentations testées n'affectent pas les taux de survie finaux et la croissance que ce soit sur des écrevisses en groupe ou isolées, les taux de survie (moyenne : 93 %) et valeurs de croissance (moyenne : 13,2 mm de longueur de carapace : CL ; 578,1 mg en poids : W ; 3,52 %·jour −1 , croissance spécifique : SGR ; 1896,6 %, en gain de poids : WG) sont les meilleurs avec l'alimentation pratique. Les taux de survie ne présentent pas de différences significatives que les écrevisses soient en groupes (86 % avec la nourriture pratique et 81,7 % avec le témoin) ou isolées (100 % de survie). Les écrevisses isolées ont une croissance significativement meilleure (14,3 mm CL, 760 mg W) que celles en groupe (11,5 mm CL, 354 mg W). Ces résultats montrent la faisabilité de cette nourriture pour des études ultérieures sur les écrevisses.

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Stocking density for the intensive rearing of juvenile crayfish, Pacifastacus leniusculus (Astacidae), using Artemia nauplii to supplement a dry diet from the onset of exogenous feeding

et al. 2009

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Recent advances in intensive rearing of astacid juvenile crayfish have greatly improved the results. This challenges the current application possibilities of the studies performed previously, and new research on density is required. A 100-day experiment was carried out under controlled conditions to evaluate density effects on survival and growth rates of juvenile crayfish in optimal conditions of feeding. Juvenile stage 2 Pacifastacus leniusculus were stocked in fibreglass tanks (1 m 2 , 200 l water) at 20 ± 1°C and fed a dry diet for salmonids supplemented with restricted amounts of Artemia nauplii. Stocking densities were 100, 300, 600 and 1,000 crayfish m -2 . Mean survival rate was reduced significantly with increased stocking density, ranging from 86.33% (100 m -2 ) to 39.13% (1,000 m -2 ). All checks showed that at the lowest initial density (100 m -2 ) animals grew significantly faster those at higher densities, recording a final carapace length of 15.28 mm and weight of 1.08 g. Among the treatments of 300, 600 and 1,000 m -2 no differences were found either in carapace length or in weight throughout the experimental period, with a final mean growth of 14 mm carapace length and 0.72 g weight. The final proportion of animals with chelae autotomy rose significantly with increasing stocking density, ranging from 14.44% (100 m -2 ) to 41.45% (1,000 m -2 ). This study shows that diet is a decisive factor for stocking successfully high densities under controlled conditions and provides useful information to set adequate densities in accordance with the production objectives.

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Live feed as supplement from the onset of external feeding of juvenile signal crayfish (Pacifastacus leniusculus Dana. Astacidae) under controlled conditions

Cited by 22 publications

References 13 publications

Additional supply of decapsulatedArtemiacysts for various periods in intensive rearing of juvenile crayfish (Pacifastacus leniusculus, Astacidae)

Additional supply of decapsulatedArtemiacysts for various periods in intensive rearing of juvenile crayfish (Pacifastacus leniusculus, Astacidae)

Proposal of a practical diet for juvenile astacid crayfish studies from the onset of exogenous feeding under controlled conditions

Stocking density for the intensive rearing of juvenile crayfish, Pacifastacus leniusculus (Astacidae), using Artemia nauplii to supplement a dry diet from the onset of exogenous feeding

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