Effects of oxygen concentration and body weight on maximum feed intake, growth and hematological parameters of Nile tilapia, Oreochromis niloticus

Tran‐Duy, An; Schrama, J.W.; Dam, A. A. van; Verreth, J.A.J.

doi:10.1016/j.aquaculture.2007.12.024

Cited by 135 publications

(109 citation statements)

References 44 publications

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“…The higher growth rates of treated groups, in the present study, compared to untreated (i.e. more female ratios) might be due to increased energy being channeled towards metabolic maintenance and somatic growth in males while the females use considerable energy for spawning (Tran-Duy et al, 2008 andChakraborty, 2010). The significant highest daily weight gain and specific growth rate recorded in T 3 group treated with the lowest dose of MT (Table 4) are in agreement with Chakraborty (2010).…”

Section: -Percentage Of Sex Reversed Fishsupporting

confidence: 60%

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Comparative study for the production of the male Nile tilapia between inter-specific hybridization and hormonal sex reversal

Al-Hakim

Hessen

Rizkalla³

et al. 2013

Egypt. J. of Aquatic Biolo. and Fish.

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ABSRRACTTilapia fry were produced by hybridization of males of blue tilapia (Oreochromis aureus) with females of Nile tilapia (O. niloticus) and by sex reversal using oral administration of 3 doses (60, 80 and 100 mg/kg diet) of the androgen 17 α-methyltestosterone (MT) for 28 days. Fry were fattening in earthen ponds for 210 days.All treatment groups that received androgen MT (T 3 , T 4 and T 5 ) showed sex reversal with a significantly higher males proportion than females as compared to the control (T 2 ) and hybrid (T 1 ) groups. The treatment group that received 60 mg MT (T 3 ) exhibited the best growth performance parameters (average weight gain, average daily gain and specific growth rate) and feed utilization parameters (feed conversion ratio, protein efficiency ratio, protein production value and energy utilization). The highest percentage of body crude protein; ether extract and ash were detected in T 3 group. With regard to human food safety, tilapias that treated with MT (T 3 , T 4 and T 5 ) rapidly excrete ingested hormone and MT levels falling to lower concentrations than that in both hybrid (T 1 ) and control (T 2 ) groups.

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Section: -Percentage Of Sex Reversed Fishsupporting

confidence: 60%

“…This explains the higher crude protein content of the treated fish than the corresponding control and hybrids in the present study. Changes in body composition, particularly in body fat content, might influence feed intake in fish (Tran-Duy et al, 2008).…”

Section: Body Proximate Compositionmentioning

confidence: 99%

Comparative study for the production of the male Nile tilapia between inter-specific hybridization and hormonal sex reversal

Al-Hakim

Hessen

Rizkalla³

et al. 2013

Egypt. J. of Aquatic Biolo. and Fish.

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“…12 In a research conducted on Nile tilapia Oreochromis niloticus, there was an effect of fish size on all the parameters except for MCV. 13 In a study on Mugil platanus, it was verified that the mean values for Hct, Hb, MCV, MCH and MCHC showed a slight tendency to increase as the fish continued to grow larger. 14 In addition, larger individuals present higher mean values for MCV, MCH and MCHC for Dolphin fish Salminus maxillosus.…”

Section: Discussionmentioning

confidence: 95%

Influence of Body Size on Blood Hemogram in Rainbow Trout Oncorhynchus Mykiss (Walbaum, 1792)

Fazio¹,

Saoca²,

Vazzana³

et al. 2017

Vet Med Open J

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“…This report is similar to the work of Little et al (2003), Dan and Little (2000), Mair et al (1995) and Abella et al (1990). Tran-Duy et al (2008), Dan and Little (2000) had earlier reported that better growth of all male tilapia is related to the lower energy expenditure on courtship and spawning. However, since no spawning was observed in the mixed-sex fish during this study (as evident in the number obtained as survival and fairly uniform size of the experimental fish) other factor may have been responsible for observed performance.…”

Section: Discussionmentioning

confidence: 98%

Growth Performance and Nutrient Utilization of Hormonal Sex-reversed Male and Mixed Sex <i>Oreochromis niloticus</i> under Outdoor Rearing Condition

Olufeagba¹,

Okomoda

Adoga³

2017

ija

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This study investigates the performance of all male and mixed sex tilapia (Oreochromis niloticus) raised in outdoor rearing conditions. All male tilapia were obtained by hormonal administration of 17 α-methyltestosterone (30 µg) into the diet of hatchlings of O. niloticus and fed them for 28 days. Both sex-reversed male and mixed sex O. niloticus were fed with coppens ® commercial diet and replicated thrice at 45% crude protein for 24 weeks Biological evaluation such as Mean Weight Gain (MWG), Specific Growth Rate (SGR) and Feed Conversion Ratio (FCR) were determined. Temperature, pH, conductivity and total dissolved solids were measured using standard methods. Data were analyzed using descriptive statistics and ANOVA at P=0.05. Result revealed that all male tilapia had significant weight gain (p<0.05) (5.93 ± 0.13 g) compared to the mixed sexes (2.19 ± 0.09 g). However, breeding activity was not noticed within the mixed sex tilapia population after a culture period of six months. Hence, poor performance could not be directly linked to spawning activity. The value of temperature, pH, conductivity and total dissolved solids were closely related and were within recommended range for the culture of tropical fishes. It was therefore hypothesized that 17 α-methyltestosterone besides achieving masculation, may have growth promoting characteristic. The detail mechanism responsible for this better performance could be the focus of future research.

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Effects of oxygen concentration and body weight on maximum feed intake, growth and hematological parameters of Nile tilapia, Oreochromis niloticus

Cited by 135 publications

References 44 publications

Comparative study for the production of the male Nile tilapia between inter-specific hybridization and hormonal sex reversal

Comparative study for the production of the male Nile tilapia between inter-specific hybridization and hormonal sex reversal

Influence of Body Size on Blood Hemogram in Rainbow Trout Oncorhynchus Mykiss (Walbaum, 1792)

Growth Performance and Nutrient Utilization of Hormonal Sex-reversed Male and Mixed Sex <i>Oreochromis niloticus</i> under Outdoor Rearing Condition

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