Comparison trials between Oreochromis andersonii (Kafue Bream) and O. niloticus (imported species) under farm conditions in Zambia.

Mapping Intimacies ◽

10.1079/ac.109983.20203483773 ◽

2020 ◽

Author(s):

Emmanuéle Cayron-Thomas

Keyword(s):

Oreochromis Niloticus ◽

Selective Breeding ◽

River Systems ◽

Small Grant ◽

The Gift ◽

Genetically Improved ◽

On Farm ◽

Selective Breeding Programme ◽

Made In ◽

Agricultural Organization

Abstract There has been much discussion for many years over the most suitable tilapia species to use in aquaculture. It has been thought for many years that Nile tilapia (Oreochromis niloticus) was the most productive, especially after it had been developed using the genetically improved farmed tilapia (GIFT) protocols, but no trials have taken place under standard farming conditions nor was there ever any consideration taken of the possible ecological side effects of the introduction of alien species into river systems. With the help of a small grant from the Food and Agricultural Organization of United Nations, Kalimba Farm, Zambia, undertook to carry out a direct comparison between the suitability of both O. niloticus and O. andersonii for fish culture under normal farm conditions. These trials took place over three years from 2004 to 2007. The overall results concluded that there were definite advantages for both species in different areas, but considering a genetically improved species was being compared with stock that had been genetically isolated for 25 years, the overall results were encouraging for the indigenous O. andersonii. In addition, taking into account the assumed damage to fragile river systems from the introduction of invasive O. niloticus it was felt that efforts should be made in future to encourage the use of O. andersonii as the preferred fish for aquaculture in areas of Zambia that are not already polluted with O. niloticus and, furthermore, an effort should be made to improve O. andersonii through an on-farm selective breeding programme using the GIFT protocols.

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A Comparative Study on the Growth, Feed Conversion and Production of Fry of Improved and Non-improved Strains of the Nile Tilapia Oreochromis niloticus

Asian Fisheries Science ◽

10.33997/j.afs.2006.19.4.001 ◽

2007 ◽

Vol 19 (4) ◽

Author(s):

M.T. RIDHA

Keyword(s):

Oreochromis Niloticus ◽

Nile Tilapia ◽

Survival Rates ◽

Feed Conversion ◽

Daily Growth ◽

Nile Tilapia Oreochromis Niloticus ◽

Fish Weight ◽

The Gift ◽

Genetically Improved ◽

The Mean

Two experiments were conducted consecutively to evaluate and compare the mean weight (MWT), daily growth rate (DGR), feed conversion ratio (FCR), survival and production rate (PR) in the non-improved strain (NS) of the Nile tilapia, Oreochromis niloticus (Cichlidae) with those in the Genetically Improved Farmed Tilapia (GIFT) strain and the FaST selected tilapia (FaST), from the swim-up fry stage to fish weight of 1.0 g (Experiment 1) and from fish weight of 1.0 to 20 g (Experiment 2). In both experiments, results showed the GIFT and FaST strains to have significantly higher MWT, faster DGR, lower FCR and higher PR than those of the NS. Unlike in Experiment 1, survival rates did not differ significantly among the three strains. In Experiment 1, the improvements in the FaST for the MWT, DGR and PR over those for the NS were 77.9, 72.9 and 33.6%, respectively. In Experiment 2, the improvements for the same parameters were 58.7, 57.8 and 54.5%, respectively. These results indicate the advantage and potential of culturing the FaST or the GIFT strain in Kuwait for improving the production of fresh tilapia, reducing the production cost and increasing the profitability of tilapia farms.

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The Effects of Feed Restriction and Isolated or Group Rearing on the Measurement of Individual Feed Intake and Estimation of Feed Conversion Ratio in Juvenile Nile Tilapia (Oreochromis niloticus) for Selective Breeding Purposes

Frontiers in Genetics ◽

10.3389/fgene.2020.596521 ◽

2021 ◽

Vol 11 ◽

Author(s):

Charles Rodde ◽

Marc Vandeputte ◽

Trong Quoc Trinh ◽

Vincent Douchet ◽

Marc Canonne ◽

...

Keyword(s):

Feed Intake ◽

Oreochromis Niloticus ◽

Feed Efficiency ◽

Nile Tilapia ◽

Selective Breeding ◽

Conversion Ratio ◽

Feed Conversion Ratio ◽

Feed Conversion ◽

Breeding Programs ◽

The Gift

Accurately measuring the phenotype at the individual level is critical to the success of selective breeding programs. Feed efficiency is a key sustainability trait and is typically approached through feed conversion ratio (FCR). This requires measurements of body weight gain (BWG) and feed intake (FI), the latter being technically challenging in fish. We assessed two of the principal methods for measuring feed intake in fish over consecutive days: (1) group rearing 10 fish per group and video recording the meals and (2) rearing fish individually on a restricted ration. Juvenile Nile tilapia (Oreochromis niloticus) from the Genetically Improved Farmed Tilapia (GIFT) strain and the Cirad strain were entered into the study (128 GIFT and 109 Cirad). The GIFT strain were reared over three consecutive periods of 7 days each under different feeding, recording, and rearing scenarios (i) in groups fed an optimal ration (g100) or (ii) fed a 50% restricted ration (g50) both with video records of all meals and (iii) reared in isolation and fed a 50% restrictive ration. The Cirad strain were tested similarly but only for scenarios (i) and (iii). All fish were fed twice daily with a calculated ration. Correlations showed the same trends for the GIFT and the Cirad strains. For the GIFT strain, correlations were positive and significant for BWG and FI measured in scenarios (i) and (ii), 0.49 and 0.63, respectively, and FI measured in scenarios (i) and (iii) (0.50) but not for BWG measured in scenarios (i) and (iii) (0.29, NS). The phenotypic correlation estimated for FCR between scenarios (i) and (ii) with fish fed an optimal or a 50% restricted ration was low and not significant (0.22). Feed Conversion Ratio for GIFT fish reared in groups or in isolation and fed with a restricted ration [scenarios (ii) and (iii)] were not significantly correlated either. Social interactions between fish, potentially impacting their efficiency, may explain the results. Therefore, selective breeding programs seeking to improve feed efficiency will need to carefully plan the feeding rate and the rearing system used to estimate FCR in order to optimize selection for the targeted production system.

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Impact of a divergent selective breeding programme on individual feed conversion ratio in Nile tilapia Oreochromis niloticus measured in groups by video-recording

Aquaculture ◽

10.1016/j.aquaculture.2021.737572 ◽

2021 ◽

pp. 737572

Author(s):

Hugues de Verdal ◽

Pierrick Haffray ◽

Vincent Douchet ◽

Marc Vandeputte

Keyword(s):

Oreochromis Niloticus ◽

Nile Tilapia ◽

Selective Breeding ◽

Video Recording ◽

Conversion Ratio ◽

Feed Conversion Ratio ◽

Breeding Programme ◽

Feed Conversion ◽

Nile Tilapia Oreochromis Niloticus ◽

Selective Breeding Programme

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Comparison of the growth performance and long-chain PUFA biosynthetic ability of the genetically improved farmed tilapia (Oreochromis niloticus) reared in different salinities

British Journal Of Nutrition ◽

10.1017/s0007114518003471 ◽

2019 ◽

Vol 121 (4) ◽

pp. 374-383 ◽

Cited By ~ 1

Author(s):

Cuihong You ◽

Fangbin Lu ◽

Shuqi Wang ◽

Cuiying Chen ◽

Yuanyou Li

Keyword(s):

Fatty Acids ◽

Growth Performance ◽

Brackish Water ◽

Oreochromis Niloticus ◽

Feeding Trial ◽

Chain Pufa ◽

Lipid Source ◽

The Gift ◽

Genetically Improved ◽

Long Chain

AbstractTo compare the growth and biosynthetic ability of long-chain PUFA (LC-PUFA) of the genetically improved farmed tilapia (GIFT) (Oreochromis niloticus) in different water salinities, an 8-week feeding trial was conducted on the GIFT juveniles at 0, 12 and 24 ‰ (parts per thousand; ppt), respectively, with three isonitrogenous (32 %) and isolipidic (8 %) diets (D1–D3). Diet D1 with fish oils (rich in LC-PUFA) as lipid source was used as the control, while D2 and D3 with vegetable oil (free LC-PUFA) blends as lipid source contained different ratios of linoleic acid (LA, 18 : 2n-6) and α-linolenic acid (ALA, 18 : 3n-3) at 4·04 (D2) and 0·54 (D3), respectively. At the end of feeding trial, the growth performance of D2 and D3 groups under all salinity treatments was as good as that of D1 group, which indicates that the GIFT juveniles may convert dietary LA and ALA into LC-PUFA to meet the requirement of essential fatty acids for normal growth and physiology. When fed the same diets, GIFT at 12 ppt had a better growth performance coupled with a higher liver and muscle arachidonic acid content than those in freshwater. Furthermore, brackish water (24 ppt) significantly promoted the mRNA levels of elongase 5 of very long-chain fatty acids (elovl5) and peroxisome proliferator-activated receptor α (pparα) in liver, when compared with freshwater. These results suggest that the GIFT may display better growth performance together with a relatively higher endogenous LC-PUFA biosynthetic ability under brackish water (12 and 24 ppt), probably through improving the expression of elovl5 and pparα in liver.

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