Influence of dietary protein and energy on growth, food consumption and food conversion efficiency in Penaeus merguiensis de Man

Sedgwick, R. W.

doi:10.1016/0044-8486(79)90168-6

Cited by 91 publications

(42 citation statements)

References 27 publications

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“…Significantly lower growth with artificial diets over the first substages of postlarval development was also observed for P. aztecus ( Venkataramiah et al . 1975 ), Penaeus merguiensis ( Sedgwick 1979) and P. monodon ( Bages & Sloane 1981; Kurmaly 1989; Amjad 1990). In experiments feeding P. monodon postlarvae with artificial diet, slower growth also resulted compared with natural diets, although survival was similar ( Forster 1972).…”

Section: Discussionmentioning

confidence: 99%

Growth and ontogenetic change in activities of digestive enzymes in Fennero Penaeus indicus postlarvae

Ribeiro

Jones

2000

Aquaculture Nutrition

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The growth and enzyme response of Fennero Penaeus indicus postlarvae (PL) was assessed with natural and artificial diets for the first 2 weeks of PL development to PL14 (14 days after metamorphosis to PL1). At PL14, postlarvae reared under similar conditions were separated into two size groups based on slow growth (9.57 ± 0.46 mm) and fast growth (13.90 ± 0.28 mm), and reared for a further 63 days. Growth among postlarvae PL1 and the smaller size group at PL14 fed on artificial diet was significantly slower than that of PLs fed on Artemia nauplii or fresh mussel. In contrast, the larger size group at PL14 did not show a significant difference in growth when fed artificial diet or fresh mussel. Trypsin and amylase response was significantly related to postlarval total length (P < 0.001); thus, digestive enzyme response increased with size and stage of development, but did not change significantly with diet fed. The amylase–protease ratio increased from PL1 and amylase activity became higher than the activity of trypsin for 2–3 weeks after metamorphosis. It appears that during the early stages of development postlarvae are unable to digest artificial diets efficiently because of low digestive capacity. Hence, poorly digestible feed delayed development and increased size variability. For smaller PL14, poor performance on artificial diets is possibly linked to a genetically regulated constraint, but not to digestive capacity since enzyme levels were similar to those found in larger PL14. During postlarval stages digestive enzyme production seems to be developmentally cued so that for postlarvae it appears that more digestible high‐energy diets are required to reduce size variability during the nursery phase.

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Section: Discussionmentioning

confidence: 99%

Growth and ontogenetic change in activities of digestive enzymes in Fennero Penaeus indicus postlarvae

Ribeiro

Jones

2000

Aquaculture Nutrition

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“…The effect of digestible protein content on individual weight gain and the effect of digestible protein intake on individual protein deposition were analysed for the summit/diluent series of diets using intersecting linear‐regression analysis (Sedgewick 1979; Allan, Maguire & Hopkins 1990). In each case, the first regression included means for the summit diet and all treatments which did not differ significantly from the summit diet.…”

Section: Methodsmentioning

confidence: 99%

Estimating digestible protein requirements of silver perch, Bidyanus bidyanus Mitchell

Allan¹,

Johnson

Booth³

et al. 2001

Aquaculture Research

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In this study, we estimated requirements for digestible protein, using intact protein sources, at one digestible energy content. Using digestibility data for silver perch (Bidyanus bidyanus Mitchell) for a large number of ingredients, we formulated a ‘summit’ diet to contain between 1.4 and 1.8 times the ‘expected requirements’ for digestible essential amino acids (based on requirements for channel catfish, Ictalurus punctatus Rafinesque). A ‘diluent’ diet was formulated to contain 0.4–0.5 times the expected requirements of digestible essential amino acids. Both ‘summit’ and ‘diluent’ diets contained similar digestible energy (14.7 MJ digestible energy kg−1 for the summit and 13.4 MJ digestible energy kg−1 for the diluent). Six diets were prepared with the following amounts of summit–diluent diets: 100:0, 80:20, 60:40, 40:60, 20:80 and 0:100. A practical diet widely used by commercial farmers was also included as a control. Ten juvenile fish (2.1–2.6 g) were stocked into each experimental 70‐L acrylic aquarium, and each dietary treatment was randomly assigned to five replicate aquaria. Fish were fed twice daily to apparent satiation for 54 days. Final individual fish weight ranged from 4–15.5 g. Results were analysed using intersecting linear regression analysis. The optimum digestible dietary protein for diets with 13.4–14.7 MJ digestible energy kg−1, after which protein deposition did not increase significantly, was 28%. Although this study did not determine requirements for individual amino acids, for diets with the digestible energy content used here, requirements for individual amino acids obviously did not exceed the content in the 28% protein diet. These contents are useful as an estimate of ‘recommended levels’ for silver perch diets with 13.4–14.7 MJ digestible energy kg−1. The proximate composition of fish was affected by diet. Whole body protein and moisture increased, whereas lipid content decreased with increasing dietary protein content (and increasing protein–energy ratio and decreasing lipid). Fish size was also affected by diet; however, the changes in whole carcass proximate composition also occurred for fish fed diets 60:40, 80:20 and the summit diet which were a similar final weight.

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“…Sedgwick (1979) showed that excessive energy in the diet decreases feed intake and consequently limits the consumption of protein and other essential nutrients. P. monodonjuveniles (about 1 g) grew best when fed 38% protein diets having energy values (physiologie al fuel values for mammalians) of 3.2 to 3.6 kcallg of diet (Lim and Pascual 1979).…”

Section: Energymentioning

confidence: 99%

Nutrition and Feeding of Fish

Lovell

1989

658

257

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Influence of dietary protein and energy on growth, food consumption and food conversion efficiency in Penaeus merguiensis de Man

Cited by 91 publications

References 27 publications

Growth and ontogenetic change in activities of digestive enzymes in Fennero Penaeus indicus postlarvae

Growth and ontogenetic change in activities of digestive enzymes in Fennero Penaeus indicus postlarvae

Estimating digestible protein requirements of silver perch, Bidyanus bidyanus Mitchell

Nutrition and Feeding of Fish

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