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EFFECTS OF FOOD SUPPLY ON THE GROWTH AND SURVIVAL OF THE COMMON SHRIMP, CRANGON CRANGON (LINNAEUS, 1758) (DECAPODA, CARIDEA)

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[The common shrimp, Crangon crangon (Linnaeus, 1758) was reared in the laboratory under controlled conditions (15°C; 34; 12/12 LD), using natural food: frozen muscle of Nephrops and prawns. The effects of food supply (fed each day and every fifth day) on growth were investigated for females and males. Each shrimp was maintained individually, the instar size was determined from exuviae, and the intermoult period was recorded. Survival was higher in both sexes when fed daily than when fed less frequently. In both sexes a food reduction both lengthened the duration of the intermoult period and reduced the moult increment. Consequently, this led to a lower growth rate with reduced feeding. The effects were greater on increment in both sexes, and female growth was more affected in both components. The relative importance of extended intermoults and reduced increments in limiting the growth of crustaceans is discussed.

La crevette grise, Crangon crangon (Linnaeus, 1758) a ete elevee au laboratoire en conditions controlees (15°C; 34; 12/12 LD), et en utilisant de la nourriture naturelle: du muscle congele de Nephrops et des crevettes. Les effets de la nourriture fournie (chaque jour et tous les cinq jours) sur la croissance ont ete etudies chez les femelles et les males. Chaque crevette etait elevee individuellement, la taille du stade etait determine a partir des exuvies et la periode d'intermue mesuree. La survie etait plus elevee dans les deux sexes lorsqu'ils etaient nourris chaque jour que lorsqu'ils etaient nourris moins frequemment. Dans les deux sexes, une reduction de nourriture allongeait a la fois la duree de l'intermue et reduisait la prise de poids. Par consequent, ceci conduisait a un taux de croissance inferieur avec une alimentation reduite. Les effets etaient plus importants sur la prise de poids dans les deux sexes et la croissance de la femelle etait plus affectee pour les deux facteurs. L'importance relative des intermues prolongees et des prises de poids reduites dans la limitation de la croissance des crustaces est discutee., The common shrimp, Crangon crangon (Linnaeus, 1758) was reared in the laboratory under controlled conditions (15°C; 34; 12/12 LD), using natural food: frozen muscle of Nephrops and prawns. The effects of food supply (fed each day and every fifth day) on growth were investigated for females and males. Each shrimp was maintained individually, the instar size was determined from exuviae, and the intermoult period was recorded. Survival was higher in both sexes when fed daily than when fed less frequently. In both sexes a food reduction both lengthened the duration of the intermoult period and reduced the moult increment. Consequently, this led to a lower growth rate with reduced feeding. The effects were greater on increment in both sexes, and female growth was more affected in both components. The relative importance of extended intermoults and reduced increments in limiting the growth of crustaceans is discussed.

La crevette grise, Crangon crangon (Linnaeus, 1758) a ete elevee au laboratoire en conditions controlees (15°C; 34; 12/12 LD), et en utilisant de la nourriture naturelle: du muscle congele de Nephrops et des crevettes. Les effets de la nourriture fournie (chaque jour et tous les cinq jours) sur la croissance ont ete etudies chez les femelles et les males. Chaque crevette etait elevee individuellement, la taille du stade etait determine a partir des exuvies et la periode d'intermue mesuree. La survie etait plus elevee dans les deux sexes lorsqu'ils etaient nourris chaque jour que lorsqu'ils etaient nourris moins frequemment. Dans les deux sexes, une reduction de nourriture allongeait a la fois la duree de l'intermue et reduisait la prise de poids. Par consequent, ceci conduisait a un taux de croissance inferieur avec une alimentation reduite. Les effets etaient plus importants sur la prise de poids dans les deux sexes et la croissance de la femelle etait plus affectee pour les deux facteurs. L'importance relative des intermues prolongees et des prises de poids reduites dans la limitation de la croissance des crustaces est discutee.]

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/content/journals/10.1163/156854000504138
2000-01-01
2015-05-28

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