Influences of food particle size on growth, size heterogeneity, food intake and gastric evacuation in juvenile Nile tilapia, Oreochromis niloticus, L., 1758

Azaza, Mohamed Salah; Dhraief, Mohamed Naceur; Kraïem, M. M.; Baras, Étienne

doi:10.1016/j.aquaculture.2010.09.026

Cited by 37 publications

(43 citation statements)

References 43 publications

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“…In contrast to radiography studies used effectively on fish to determine gut transit times or GIE times (Jobling, 1987;Jobling et al, 1977;Tablot and Higgins, 1983) and feed intake (Azaza et al, 2010;Hossain et al, 1998;Palson et al, 1992), the use of radiography as a method to determine both GIE time and feed intake in greenlip abalone in this study was not effective. The reason radiography was not effective in greenlip abalone was most likely due to differential rate of movement of Ballotini balls in comparison to feed through the gastrointestinal tract.…”

Section: Discussioncontrasting

confidence: 49%

Gastrointestinal evacuation time, but not nutrient digestibility, of greenlip abalone, Haliotis laevigata Donovan, is affected by water temperature and age

Currie

Lange

Herbert³

et al. 2015

Aquaculture

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Section: Discussioncontrasting

confidence: 49%

Gastrointestinal evacuation time, but not nutrient digestibility, of greenlip abalone, Haliotis laevigata Donovan, is affected by water temperature and age

Currie

Lange

Herbert³

et al. 2015

Aquaculture

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“…4), implying that the growth penalty for consuming prey n% smaller than DM opt was more severe than for prey n% larger than DM opt . Similar asymmetric dome-shaped patterns have been documented in studies on the effect of pellet diameter on fish growth (e.g., Tabachek 1988;Hossain et al 2000;Azaza et al 2010). This asymmetric shape can be accounted for by the allometric scaling of food particle volumes, surfaces and diameters, which intimately govern their energy content, digestibility and detectability (or escape capacities for a live prey), respectively.…”

Section: Size-dependent Variations Of Optimal Prey Size (Dm Topt )mentioning

confidence: 50%

“…A similar interest has been raised in aquacultural studies aiming to understand the relative benefits of using a small or large food particle size (for fishes: Wankowski and Thorpe 1979;Goldan et al 1997;Hasan and Macintosh 2008;Azaza et al 2010). Small prey are more difficult to detect at long distance (Folkvord 1997), but easier to capture and handle (Knights 1983;Mittelbach and Persson 1998), and unless their gut residence time is excessively brief (Hossain et al 2000) they can be digested more completely (Persson 1986;Jobling 1987).…”

Section: Introductionmentioning

confidence: 99%

Do cannibalistic fish forage optimally? An experimental study of prey size preference, bioenergetics of cannibalism and their ontogenetic variations in the African catfishHeterobranchus longifilis

Baras¹,

Dugué²,

Legendre³

2014

Aquat. Living Resour.

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-This study relied on the day-by-day analysis of bioenergetics and prey size preference in isolated cannibals of the African catfish Heterobranchus longifilis (13-57 mm standard length, 3-500 mg dry body mass, n = 153) that were offered ad libitum conspecific prey of adequate sizes in small-sized (2-L) environments under controlled conditions (12L:12D, 30• C). In these conditions, cannibals of increasing body size selected preferentially prey of decreasing size relative to their own, and increasingly closer to the optimal prey size (producing the highest gross conversion efficiency). The role of experience in cannibalism was found of secondary importance relative to body size, both as regards food intake and prey size selectivity. These results indicate that in environments that minimize the escape capacities of their potential victims, as applies to most aquacultural contexts, fish exercising cannibalism tend to forage optimally, which has rarely been evidenced for piscivorous behaviour. The present study further highlights that H. longifilis possesses a very high capacity for growth, which originates from the combination of high food intake and very high conversion efficiency, and makes this species of utmost interest for aquaculturists wherever fast growth is desirable, but also extremely prone to cannibalism wherever feeding schedules are inadequate.

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“…In aquaculture, as in any type of animal husbandry, it is preferable to reduce animal size variations to produce a homogeneous animal size as that would facilitate feeding (Azaza et al, 2010a), harvesting, marketing and processing. As the majority of farmed fish, Nile tilapia Oreochromis niloticus L. reared in groups, exhibit a strong inter-individual growth rate, leading the farmers to grade their fish several times during the production cycle.…”

Section: Introductionmentioning

confidence: 99%

The effects of rearing density on growth, size heterogeneity and inter-individual variation of feed intake in monosex male Nile tilapia Oreochromis niloticus L.

Azaza

Assad

Maghrbi

et al. 2013

Animal

Self Cite

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The growth dispersion of farmed fish is a subject of increasing interest and one of the most important factors in stocking density. On a duration of 60 days, the effect of stocking density on the growth, coefficient of variation and inter-individual variation of feed intake (CVFI) of juvenile Nile tilapia Oreochromis niloticus L. (14.9 ± 1.2 g) were studied in an experimental tank-based flow-through system. Groups of fish were stocked at four stocking densities: 200, 400, 600 and 800 fish/m3, corresponding to a density of ∼3, 6, 9 and 12 kg/m3 and referred to as D1, D2, D3 and D4, respectively. Each treatment was applied to triplicate groups in a completely randomized design. No treatment-related mortality was observed. The fish densities increased throughout the experiment from 3 to 23.5, 6 to 43.6, 9 to 56.6 and 12 to 69 kg/m3. Results show that mass gain and specific growth rate (SGR, %M/day) were negatively correlated with increased stocking density. Groups of the D1 treatment reached a mean final body mass (FBM) of 119.3 g v. 88.9 g for the D4 groups. Feed conversion ratios (FCRs) were 1.38, 1.54, 1.62 and 1.91 at D1, D2, D3 and D4 treatments, respectively. Growth heterogeneity, expressed by the inter-individual variations of fish mass (CVM), was significantly affected by time (P < 0.001), stocking density (P < 0.001) and their interaction (P < 0.05). The difference in CVM was particularly conspicuous towards the end of the experiment and was positively correlated with stocking density. Similarly, radiographic study shows that CVFI was also found to be significantly greater for groups reared at high stocking densities (D3 and D4) than the other treatments (D1 and D2). These differences in both CVM and CVFI related to the stocking density need to be taken into account by husbandry practices to assure the production of more homogeneous fish size. A simple economic analysis indicates a parabolic relationship between profit and density with optimal final density at the peak of the curve. Given reasonable assumptions about production costs, the optimal final density (D opt) is 73.7 kg/m3. A sensitivity analysis shows that changes in the fixed cost have no effects on the optimal final density. However, small change in variable costs, such as feed and juvenile costs, may have substantial effect on the optimal density.

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Influences of food particle size on growth, size heterogeneity, food intake and gastric evacuation in juvenile Nile tilapia, Oreochromis niloticus, L., 1758

Cited by 37 publications

References 43 publications

Gastrointestinal evacuation time, but not nutrient digestibility, of greenlip abalone, Haliotis laevigata Donovan, is affected by water temperature and age

Gastrointestinal evacuation time, but not nutrient digestibility, of greenlip abalone, Haliotis laevigata Donovan, is affected by water temperature and age

Do cannibalistic fish forage optimally? An experimental study of prey size preference, bioenergetics of cannibalism and their ontogenetic variations in the African catfishHeterobranchus longifilis

The effects of rearing density on growth, size heterogeneity and inter-individual variation of feed intake in monosex male Nile tilapia Oreochromis niloticus L.

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