Growth, Survival and Feed Conversion Rates of Sea Bream (Sparus aurata) Cultured in Earthen Brackish Water Ponds Fed Different Feed Types

Sadek, S.; Osman, M.; Mansour, Merveet

doi:10.1023/b:aqui.0000042131.29346.93

Cited by 20 publications

(12 citation statements)

References 8 publications

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“…The growth trial that was carried out in order to investigate possible anti-nutritional effects did not reveal any negative effect on fish growth and the physiological parameters. The production parameters and somatic indexes considered in our study are comparable with those reported in other studies on gilthead sea bream under experimental conditions (Sanchez-Muros et al 2003;Sadek et al 2004). The absence of differences in the production traits between experimental treatments suggests the possibility of utilising VW in sea bream feed.…”

Section: Discussionsupporting

confidence: 88%

Olive oil by-product as a natural antioxidant in gilthead sea bream (Sparus aurata) nutrition

Sicuro

Daprà

Gai³

et al. 2009

Aquacult Int

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The aim of the study reported here was to evaluate the efficiency of a natural antioxidant substance in gilthead sea bream (Sparus aurata) feeds. An olive oil by-product, olive mill vegetation water (VW), contains polyphenols, which have a strong antioxidant activity. A 147-day growth trial was conducted (monofactorial balanced, 4 9 3) with diet as the experimental factor. Two diets [isonitrogenous (crude protein 40%) and isoenergetic (gross energy = 18MJ kg -1 on a dry weight basis] were formulated with 1 and 5% of VW (VW1, VW5); the control diet did not contain VW. A total of 600 juvenile gilthead sea breams (mean body weight 114.1 ± 5.7 g) were utilised. Production parameters and somatic indexes were calculated at the end of the growth trial. Antioxidant activity in fish fillets was investigated using TBARS and DPPH assays. A number of haematological parameters and digestive enzyme patterns were measured in fish in the middle and at the end of the experiment. The TBARS values showed slight delays in the development of oxidation in the fillet of fish fed with VW. There was no statistical difference between fish fed with the experimental diet and the control group, except for maltase activity, which increased with increasing VW in the feed. We found that the use of VW in a gilthead sea bream diet did not have any detrimental effects on gilthead sea bream production and physiological parameters and slightly improved the conservation of the fish fillets.

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Section: Discussionsupporting

confidence: 88%

Olive oil by-product as a natural antioxidant in gilthead sea bream (Sparus aurata) nutrition

Sicuro

Daprà

Gai³

et al. 2009

Aquacult Int

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“…This value was very close to that obtained for the species of 100-200 g (1.81% of biomass) grown at 23°C (Lupatsch et al 2003), but relatively lower than the corresponding value (2.26% body weight) for smaller juvenile fish (IW, 10 g) fed a mixture of vegetable oils as a partial substitute of fish oil at 20-24°C (Izquierdo et al 2003). For commercial semi-intensive gilthead seabream culture, a similar daily feed consumption of about 2% of biomass was previously recorded in earthen ponds in Egypt (Sadek et al 2004). These slight variations of feed intake rate are mainly related to initial fish size, prevailing temperature, and other environmental conditions.…”

Section: Discussionsupporting

confidence: 49%

“…Its production level is rapidly growing after the development and improvement of technologies used. In Egypt, these fishes have traditionally also been considered as a high value fishery product (Sadek et al 2004). Their high marketability, locally and for export, has led to the directing of more efforts towards the expansion of their culture countrywide.…”

Section: Introductionmentioning

confidence: 99%

Vegetable oil blend as alternative lipid resources in diets for gilthead seabream, Sparus aurata

2008

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The recent decreasing worldwide supplies of marine oils have forced the aquaculture industry to investigate alternative lipid sources for use in marine fish feeds. The aim of this study was to determine the impact of dietary replacement of fish oil by vegetable oils on gilthead seabream (Sparus aurata) growth performance, nutritive utilization, body composition, and fatty acid profile as well as feed cost. Two dietary vegetable oil (VO) mix blends (VO1 and VO2) in which: sunflower (SO), cottonseed (CO) and linseed (LO) for VO1 or soybean oil (SBO) for VO2, were tested as 60% fish oil (FO) substitutes versus the 100% FO control or reference diet (FO). Three iso-proteic (46% CP) and iso-lipidic (18%) experimental diets were hand fed, twice a day, 6 days a week to apparent visual satiety to triplicate groups of seabream growers (average initial weight, 130.9 ± 3.44 g), until fish reached market size (300-400 g/fish) after 20 weeks at mean ambient temperature 27.0 ± 1.8°C. All experimental diets were well accepted by seabream growers regardless of the different lipid sources used, as overall mean feed intake (FI) and daily intake (DFI) were not significantly different (P [ 0.05) among dietary treatments. In terms of growth performance, fish fed VO1 diet (with LO) exhibited a relatively lower, but significant (P \ 0.05), total weight gain (WG) than fish fed all FO diet (FO). However, mean value of WG of fish fed either vegetable oil-tested diet was nonsignificantly different. Feeding seabream growers vegetable oil (VO) diets (VO1 or VO2) had no significant effect on specific growth rate (SGR), daily weight index (DWI), or feed conversion ratio (FCR) among dietary treatments. Consumption of VO for 20 weeks did not significantly alter the major nutrient composition of fish, but the muscle fatty acid (FA) profile was significantly altered compared to the reference FO diet. Comparatively reduced levels of eicosapentaenoic acid (EPA) and docosahexaenoic acids (DHA), as well as elevated levels of linoleic and linolenic acids (LA and LNA) compared with fish fed the FO were noticed. In terms of economics, 17 or 20% reduction in Kg feed cost was obtained for diets VO1 or VO2, respectively. In terms of growth performance and cost, VO2 diet showed slight relative superiority over VO1 diet. However, in terms of liver structure morphology, VO1 diet (with LO) has resulted in less fat-infiltration and altered hepatic cells than VO2 (with SBO). As these traits do not affect yield or the price paid for the fish, VO2 diet has therefore been considered better than VO1 as complementary lipid sources for gilthead seabream grower diets.

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“…The feeds employed within aquaculture in Lake Manzala range from commercially produced fish food to locally available poultry waste products. N retention in fish relative to N load to a pond or aquaculture cage may range from 5% to 30% depending on the production and quality of the feed (Little & Satapornvanit, 1995;Essa et al, 2005;Sadek et al, 2004).…”

Section: Fish Feeds and N Retention In Fishmentioning

confidence: 99%

Hydrodynamic-ecological model analyses of the water quality of Lake Manzala (Nile Delta, Northern Egypt)

et al. 2009

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Lake Manzala remains the largest of the Nile Delta lakes and has undergone substantial recent changes particularly over the last 30 years due to regulation of freshwater inflows, land reclamation and increasing loads of BOD and nutrients. The latter are particularly associated with polluted drains flowing into the lake. An increasing fraction of the N load may also come from the expanding fish farming industry within and around the lake. Over the past 20-25 years, the N load from the drains has increased three times whilst the P load has remained approximately constant. This is despite a 40% reduction in freshwater inflows due to diversion of water towards the Sinai for land development. As a result of these changes, the concentration of total N in the drains has increased 4.5 times while the total P concentration has increased by 50% over the same period. Increases in nutrient concentrations can be attributed to increase in the use of fertilizer combined with an expanding population served by sewers, improved living standards and increased industrial production. Nutrient enrichment has resulted in declining water quality and eutrophication, especially in the southern parts of Lake Manzala. A combined hydrodynamicecological model has been set up for the lake and is used to analyse the development of water quality as a function of the load of organic material and nutrients. Model results show that 86% of the N load and 59% of the P load are retained within the lake. Despite the efficient treatment of wastewater by the lake ecosystem, approximately 6,000 tonnes of N and 1,300 tonnes of P are exported to the Mediterranean through the two main lake-sea connections. This nutrient export has important implications for coastal fisheries production. The present investigation suggests that the current anthropogenic nutrient load to the coastal zone exceeds that of pre-Aswan High Dam conditions despite large reductions in the annual pulse of water and nutrients brought about by the dam. A series of model simulations with reduced nutrient load are investigated in order to identify the conditions required to enable the propagation of vegetation throughout the lake. Submerged rooted vegetation is used as an indicator for water quality as it needs light for growth and in polluted, eutrophicated waters turbidity increases hampering vegetation growth. Simulation results indicate that the nutrient load has to be reduced to approximately 25% of the present loads if submerged rooted vegetation is to become re-established in the more polluted south eastern parts of the lake.

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Growth, Survival and Feed Conversion Rates of Sea Bream (Sparus aurata) Cultured in Earthen Brackish Water Ponds Fed Different Feed Types

Cited by 20 publications

References 8 publications

Olive oil by-product as a natural antioxidant in gilthead sea bream (Sparus aurata) nutrition

Olive oil by-product as a natural antioxidant in gilthead sea bream (Sparus aurata) nutrition

Vegetable oil blend as alternative lipid resources in diets for gilthead seabream, Sparus aurata

Hydrodynamic-ecological model analyses of the water quality of Lake Manzala (Nile Delta, Northern Egypt)

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