Environmental requirements

El‐Sayed, Abdel‐Fattah M.

doi:10.1016/b978-0-12-816509-6.00004-5

Cited by 8 publications

(18 citation statements)

References 99 publications

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“…These levels are in line with recent recommendations 36 and it is therefore unlikely that protein deposition was limited by oxygen availability in these cases. The same applies to the water temperature ranges applied to these eight cases (27.5-28 C), which were close to the 28-30 C recommended for Nile tilapia.…”

Section: Protein Deposition In Nile Tilapia: Maximal Capacitysupporting

confidence: 91%

“…The selected studies covered a large range of body size classes, dietary crude protein and gross energy content and dietary P:E (Table 2). Most experiments were conducted at temperatures close to the 28–30°C known optimum, 36 except for three early studies, 28,29,37 which were conducted at sub‐optimal water temperatures (21–24°C). Most studies were conducted on all‐male selected populations of Nile tilapia, with the genetically improved farmed tilapia (GIFT) strain being used in many cases.…”

Section: Methodsmentioning

confidence: 99%

“…The same applies to the water temperature ranges applied to these eight cases (27.5-28 C), which were close to the 28-30 C recommended for Nile tilapia. 36 The same oxygen and temperature ranges also applied to the 20 observations where protein gain levelled-off at high crude protein intake. Thus, at the highest end of the daily protein and energy intake ranges, protein gain was neither limited by protein (20 cases), energy intake (8 cases), dissolved oxygen availability or water temperature.…”

Section: Protein Deposition In Nile Tilapia: Maximal Capacitymentioning

confidence: 99%

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Balancing protein and energy in Nile tilapia feeds: A meta‐analysis

Konnert

Gerrits

Gussekloo

et al. 2022

Reviews in Aquaculture

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Farmed fish are increasingly grown in intensive and semi-intensive systems where most nutrients are provided by formulated feeds. These are formulated to minimise costs and optimise growth, notably the rate of muscle protein synthesis (i.e., fillet). Protein synthesis depends on the availability of amino acids (i.e., protein) and energy. Thus, fish feeds are often formulated to provide a balanced ratio of protein to energy (P:E). Above and below the optimal dietary P:E, absorbed protein and energy are expected to be underutilised for body protein synthesis, respectively. Estimates of the optimal dietary P:E vary largely for Nile tilapia (Oreochromis niloticus (L., 1758)). Published values range from 13 to 26 g of dietary protein per MJ of energy. Here, we challenge the idea that growth, protein utilisation efficiency and body composition can all be simultaneously optimised, when Nile tilapia are fed an optimal dietary P:E. Through linear and non-linear regression meta-analyses, we quantitatively describe the effects of protein and energy intake on nutrient partitioning, feed efficiency and growth. We find linear relationships between the dietary P:E and protein retention efficiency. The lack of an inflection contradicts the existence of an optimal P:E. Our regressions of protein and energy intake versus protein gain, indicate that protein gain is often simultaneously limited by both protein and energy intake, and may be limited by other factors than protein and energy intake, such as a maximal protein deposition capacity (PD max ). We conclude that there is no physiological basis for an optimal P:E in Nile tilapia feeds.

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Section: Protein Deposition In Nile Tilapia: Maximal Capacitysupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Protein Deposition In Nile Tilapia: Maximal Capacitymentioning

confidence: 99%

See 1 more Smart Citation

Balancing protein and energy in Nile tilapia feeds: A meta‐analysis

Konnert

Gerrits

Gussekloo

et al. 2022

Reviews in Aquaculture

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“…Poor or low mean water transparency (27.8 cm) was noted during this rearing period. This, among other factors (abiotic or biotic, to include interaction with the Nile tilapia in the cages) could have affected red tilapia growth and survival [30,31] especially during the first few weeks of culture. Meanwhile, the prawns even when stocked at a higher density showed higher survival (65-69.3).…”

Section: Tilapia-prawn Co-culture In Lake Cagesmentioning

confidence: 99%

Assessment of Tilapia–Freshwater Prawn Co-Culture Schemes in Tanks and Lake-Based Cages for Increased Farm Production

et al. 2021

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The technical viability of tilapia (I-ExCEL strain Nile or red) and giant freshwater prawn (GFP) co-culture in cages-within-tanks was evaluated while appropriate feeding protocols for tilapia-GFP co-culture in cages in a eutrophic lake were determined. Specifically, production parameters in all test species grown for five months in tank co-culture (where only tilapias were fed) were compared, while the best feeding protocol from among the following treatments: (a) Tfed—fed tilapias; (b) GFPfed—fed prawns and (c) T-GFPfed—both species fed, were defined. I-ExCEL Nile tilapias grew faster in tank co-culture whether reared singly or otherwise. However, red tilapia-GFP tank co-culture gave the best results considering key production traits in all test species (red tilapia —2.52%/day specific growth rate or SGR, 83.3% survival; GFP—1.17%/day SGR, 72.85% survival). Lake-based co-culture was technically feasible at stocking densities of 12.5/m2 for tilapia and 2.4 to 4/m2 for prawns even when only tilapias were fed; prawns grew to desired marketable sizes by thriving mainly on detritus and natural food organisms in the lake. However, further refinements can still be made to optimise the co-culture schemes to make them more sustainable and provide artisanal fish farmers options in increasing farm yields through multi-species aquaculture.

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“…Blooms of B. braunii in Egypt also caused mortality of the same fish species (Labib et al 2012). This fish species is known to tolerate a wide variety of environmental conditions, growing at water salinities ranging from 0 to 19 (freshwater to brackish), from low DO levels of 0.1-0.5 mg/L to 400% oxygen supersaturation, and pH of 3.5-12.0 (El-Sayed 2006, 2020. Also, the fish can tolerate ammonia concentrations up to 2.4 mg/L (without acclimatization) and 3.4 mg/L (with acclimatization to the sublethal level of ammonia) (Redner and Stickney 1979, El-Shafey 1998, El-sayed 2006.…”

Section: Potential Fish Kill Mechanism By B Brauniimentioning

confidence: 99%

Bloom of a freshwater green alga <i>Botryococcus braunii</i> (Botryococcaceae, Trebouxiophyceae) and the associated mass fish mortality in a man-made lake, Sarawak, Malaysia

Teng

Law

Hanifah

et al. 2021

Plankton Benthos Res

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Mass mortality of fish (∼8,500 fishes), mainly Oreochromis placidus, was noted in a man-made lake located at Kuching, Sarawak (Malaysia). A field investigation was conducted to collect water samples and fishes. Patches of discoloration in brick red were observed in the lake and clear oil layer was found on the surface of the water. Microscopic observation and enumeration of the water samples showed that the plankton composition was dominated by a green algal species Botryococcus sp., with the colony densities ranging 1.2×10 3 -7.4×10 6 colonies L −1 . Detailed morphological assessment by light microscopy revealed the dominant species as Botryococcus braunii Kützing. Molecular characterization using an rDNA marker further supported the species identity as B. braunii in the L race. Fish gill observation showed that cells of B. braunii and the oily substances were found in the dead fish gills. The race-L B. braunii bloom was reported, for the first time, to be associated with a fish kill event in a freshwater lake in Malaysia and confirmed the species as one of the algal types causing harmful effects to the environment.

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Environmental requirements

Cited by 8 publications

References 99 publications

Balancing protein and energy in Nile tilapia feeds: A meta‐analysis

Balancing protein and energy in Nile tilapia feeds: A meta‐analysis

Assessment of Tilapia–Freshwater Prawn Co-Culture Schemes in Tanks and Lake-Based Cages for Increased Farm Production

Bloom of a freshwater green alga <i>Botryococcus braunii</i> (Botryococcaceae, Trebouxiophyceae) and the associated mass fish mortality in a man-made lake, Sarawak, Malaysia

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