Influence de la densité initiale de larves de brochet (Esox lucius L., 1758) en élevage intensif sur la survie, la croissance et la consommation journalière de nourriture (zooplancton, Chaoboridés)

Gres, Pierre; Lim, P.; Belaud, A.

doi:10.1051/kmae:1996013

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…Because water condition in the study tanks was not controlled (e.g., cf. with conditions detailed in Górny 1992, Wang and Eckmann 1992, Gres et al 1996, nor did they mimic natural conditions (e.g., cf. with conditions detailed in Mejza et al 1996, Desvilettes et al 1997, Morrow et al 1997, we considered our grow-out operation to represent uncontrolled field conditions.…”

Section: Methodsmentioning

confidence: 99%

Grow-out of northern pike (Esox lucius L.) larvae under uncontrolled conditions

Wolska-Neja

Neja²

2006

Acta Ichthyol. Piscat.

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Background. This study aimed to determine survival rate, extent of cannibalism, and growth rate of northern pike (Esox lucius L.) larvae fed live zooplankton during a grow-out period, i.e., the time prior to when fish become valuable as stocking material. An attempt was also made to assess the food conversion ratio (FCR) with respect to the natural food applied. Materials and Methods. Grow-out operations began with 1-day-old pike larvae and involved experimental in-ground tanks with no artificial aeration, forced water flow, artificial circadian lighting, or temperature control. Differently structured habitats (black polyethylene foil, vascular plants, or plastic netting) were placed in all the tanks to separate larvae and provide cover. Feeding live zooplankton to the larvae began on day 3 and food was administered such that larvae were always surrounded by a zooplankton "cloud." Results. The survival rate during the first-(days 1-7) and second (days 8-27) stage of culture was 92.3% and 95.7%, respectively. Highest survival rates were associated with tanks with polyethylene foil habitats, while lowest survival rates were associated with tanks containing plastic netting. No cannibalism was observed in any tank. During the growout period, the total length of larvae increased by an average of 20.88 mm. Although the length increase observed in the three experimental treatments was similar; the significantly highest (P < 0.01) mean length (32.66 mm) was associated with larvae raised in tanks containing polyethylene foil. Until day 13, the mean weight of the larvae did not differ between the three treatments (P = 0.21). At and beyond day 20, fish kept in tanks equipped with polyethylene foil exhibited higher weight increments and on termination of the experiment the mean individual weight of larvae was significantly higher (P < 0.05) than those of larvae in tanks with vascular plants and plastic netting. The food conversion ratio, calculated for the entire culture period was 4.9. Conclusion. High survival rate of the cultured pike larvae demonstrated the success of pike larvae grow-out under uncontrolled conditions.

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Section: Methodsmentioning

confidence: 99%

Grow-out of northern pike (Esox lucius L.) larvae under uncontrolled conditions

Wolska-Neja

Neja²

2006

Acta Ichthyol. Piscat.

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“…Le rythme alimentaire La courbe obtenue pour le stade planctonophage correspond tout à fait aux observations de Lejolivet (1988) et Grès (1994) qui précisent que dans le milieu naturel, on observe souvent deux pics de repletion, un diurne et un crépusculaire. Néanmoins, des dissimilitudes apparaissent: Lejolivet remarquait que des alevins élevés avec une très forte ration n'avaient pas de rythme de prise alimentaire marqué ce qui n'a pas été le cas dans notre cage où le plancton était pourtant en très grande densité.…”

Section: Vidange Gastriqueunclassified

Rythme alimentaire et vidange stomacale chez le brochet (Esox luciusL.) au cours des changements de régime de la première année de croissance

Filleul¹,

Louarn²

1998

Ann. Limnol. - Int. J. Lim.

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Mots clés : brochet, Esox lucius, alevin, vidange gastrique, rythme alimentaire.La vidange stomacale et les rythmes de prise alimentaire ont été étudiés chez des brochets d'âge 0+ en suivant l'évolution de leur régime alimentaire (planctonophage, entomophage, ichtyophage). La vidange stomacale a été suivie en présentant les proies majoritairement consommées dans le milieu naturel aux stades alimentaires concernés. En général les équations linéaires et logarithmiques décrivent le mieux la vidange gastrique. Les effets sur la vidange de la température, de la nature des proies et de leur taille sont discutés. Les brochets digèrent mal la chitine : l'évolution de la digestion des proies chitineuses est présentée. A tous les stades alimentaires, les brochets montrent une activité prédatrice diurne. Le rythme alimentaire est de plus nettement biphasique au stade planctonophage. Feeding rhythm and gastric emptying in the pike (Esox lucius L.) during the feeding changes below one year of ageKeywords : pike, Esox lucius, fingerling, gastric emptying, feeding rhythm.The gastric emptying and the feeding rhythm have been studied with young pike below one year of age according to the natural progressive changes in their feeding process (planktivorous, entomophagous, ichthyophagous). The gastric emptying has been followed along with prey that are to be encountered by pike in their natural environment. In general, linear and logarithmic equations best describe the gastric emptying. The effects of the temperature and of the size and the nature of the prey upon the gastric emptying are dicussed. Pike do not digest chitin well. The evolution of the digestion of chitinous prey is given. At every feeding stage, pike display a day-time hunting activity. Moreover, the feeding rhythm is clearly bi-phasic at the planktivorous stage.

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Larval Rearing of Common Carp Cyprinus carpio: A Comparision Between Natural and Artificial Diets Under Three Stocking Densities

Sharma

Chakrabarti

1999

J World Aquaculture Soc

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Ahstrucr.-Common carp Cyprinus curpio larvae were cultured under two feeding conditions: live food or an artificial diet for 40 d in recirculating systems. Three stocking densities of 25 (low), 50 (medium), and 100 (high) larvae/l5-L aquarium were maintained for each feeding treatment. Significantly higher survival (9 1 %) and growth (40 1.08 2 2.6 1 mg) were observed in the low density, live food system. Average weight of larvae in the live food system was 3to 5-fold higher than larvae at the same stocking density for the artificial diet. Proteolytic activity showed a direct relationship with the length of the digestive tract ( r = 0.95). The highest enzyme activity was observed in the low density, live food system. Survival and growth of common carp larvae are influenced by both the stocking density and the type of food. 0

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Influence de la densité initiale de larves de brochet (Esox lucius L., 1758) en élevage intensif sur la survie, la croissance et la consommation journalière de nourriture (zooplancton, Chaoboridés)

Cited by 6 publications

References 11 publications

Grow-out of northern pike (Esox lucius L.) larvae under uncontrolled conditions

Grow-out of northern pike (Esox lucius L.) larvae under uncontrolled conditions

Rythme alimentaire et vidange stomacale chez le brochet (Esox luciusL.) au cours des changements de régime de la première année de croissance

Larval Rearing of Common Carp Cyprinus carpio: A Comparision Between Natural and Artificial Diets Under Three Stocking Densities

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