Effect of 17α-methyltestosterone on the growth of the euryhaline tilapia, Oreochromis mossambicus, in fresh water and in sea water

Kuwaye, Todd T.; Okimoto, Darren K.; Shimoda, S; Howerton, Robert D.; Lin, Hsin-Fu; Pang, Peter K.T.; Grau, E. Gordon

doi:10.1016/0044-8486(93)90347-2

Cited by 80 publications

(33 citation statements)

References 20 publications

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“…Dagne et al (2013) highlighted that lack of energy expenditure in egg production and mouth brooding by females and lower energy expenditure on courtship are some of the reasons behind faster growth rate in male monosex tilapia. In addition, the higher growth rate of male monosex tilapia may have been due to the influence of 17--methyltestosterone hormone used for sex-reversal, which has been shown to be a growth promoter in Oreochromis mossambicus (Kuwaye et al, 1993). Findings by Shepherd et al (1997) (Mugo-Bundi, 2013).…”

Section: Resultsmentioning

confidence: 99%

COMPARATIVE GROWTH PERFORMANCE OF MALE MONOSEX AND MIXED SEX NILE TILAPIA (Oreochromis niloticus L.) REARED IN EARTHEN PONDS

Githukia

Ogello

Kembenya

et al. 2015

CJF

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Comparative growth performance of male monosex and mixed sex Nile tilapia (Oreochromis niloticus) was conducted in six earthen ponds each measuring 150 m 2 at the Kenya Marine & Fisheries Research Institute (KM-FRI), Kegati Aquaculture Research Station. Male monosex and mixed sex of O. niloticus juveniles at an average weight of 12.2 ± 0.02 g and average length of 7.6 ± 0.02 cm were collected from nursery production ponds. The male monosex juveniles were obtained by feeding newly hatched juveniles with feed dosed with 17--methyltestosterone hormone for a period of one month. Stocking was at 3 juvenile m -2 and feeding was carried out using 28% crude protein diet twice daily for six months at 4% body weight. Selected water quality parameters (dissolved oxygen, temperature, pH, electrical conductivity and total ammonia nitrogen) were measured weekly in situ, while sampling for weight and length measurements was conducted on a monthly basis for a period of six months. Specific Growth Rate (SGR), Feed Conversion Ratio (FCR), Condition Factor (CF) and survival rate (%) were measured at the end of six months. Data were subjected to one-way analysis of variance (ANOVA). At the end of six months, the average weight of male monosex and mixed sex fishes was 200.8 ± 0.81 g (mean ± SE) and 123.4 ± 0.76 g, respectively, while the average length of male monosex and mixed sex was 22.4 ± 0.21 cm and 18.6 ± 0.23 cm, respectively. The male monosex O. niloticus achieved significantly increased final weight and length, SGR, FCR and CF than the mixed sex O. niloticus (p < 0.05). However, both male monosex and mixed sex fish recorded similar survival rates (p > 0.05). There were no significant differences in mean water quality parameters in male monosex and mixed sex ponds (p > 0.05). The male monosex fish performed better because most energy was spent on muscle and tissue development while the mixed sex fish spent most energy on reproduction activities at the expense of muscle and tissue development. Further studies should be done in other culture systems such as liner ponds, tanks, cages and raceways. How to Cite

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Section: Resultsmentioning

confidence: 99%

COMPARATIVE GROWTH PERFORMANCE OF MALE MONOSEX AND MIXED SEX NILE TILAPIA (Oreochromis niloticus L.) REARED IN EARTHEN PONDS

Githukia

Ogello

Kembenya

et al. 2015

CJF

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“…During sexing of fish at harvest, many females from all the culture systems were found to possess ovaries filled with eggs and further lengthening of culture duration might have resulted in subsequent spawning. Growth increase in androgen treated fish was also reported in Oreochromis mossambicus (Kuwaye et al, 1993), Oncorhynchus kisutch and Cyprinus carpio (Pandian and Sheela, 1995). Shepherd et al (1997) suggested that the growth-promoting actions of 17αMT in tilapia were linked to elevations in growth hormone (GH) metabolism and consequently to insulin-like growth factors (IGFs).…”

Section: Discussionmentioning

confidence: 99%

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Chakraborty¹,

Mazumdar²,

Chatterji³

et al. 2011

Turk. J. Fish. Aquat. Sci.

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Growth of 17α-methyltestosterone treated monosex Nile tilapia, Oreochromis niloticus was compared with hormone untreated mixed-sex fish in four different culture systems. The experiment had 2 X 4 factorial design: the first factor was presence or absence of hormone treatment (monosex and mixed-sex fish), the second factor was related to culture system (cistern, flow-through, pen and pond). Fish were cultured under similar feeding regime and stocking density for six months and different growth parameters such as body weight, length, daily weight gain (DWG), specific growth rate (SGR), proximate body composition and survival rate were analyzed. Monosex tilapia showed significantly higher (P-value <0.05) weight, length, DWG, SGR and protein content than mixed-sex fish. Fish in Pond culture showed significantly higher (Pvalue <0.05) weight, DWG and protein content than fish in other 3 culture systems. Survival was not significantly different (P>0.05) among mixed-sex and monosex fish and between different culture systems. Monosex tilapia in pond culture system showed the highest weight, DWG and protein content while mixed-sex tilapia in cistern culture system showed the lowest weight, DWG and protein content. Considering the results of this study, culture of monosex tilapia in earthen ponds might be considered the ideal method for tilapia culture in India.Keywords: Oreochromis niloticus, monosex culture, growth in different culture systems. Monoseks ve Karma Nil Tilapiyasının Farklı Kültür Sistemlerinde Büyümesi ÖzetDört farklı kültür sisteminde 17 α -metiltestosteron uygulaması yapılan tek cinsiyetli Nil Tilapiyasının, Oreochromis niloticus büyümesi ile hormon uygulanması yapılmayan karma cinsiyetli balıklar karşılaştırılmıştır. Deney, 2 X 4 etmensel tasarımdan oluşmaktadır: birinci etmen hormon uygulaması (tek cinsiyet ve karma cinsiyetli balık), ikinci etmen ise kültür sistemidir (rezervuar, tek kullanım sistemi, kafes ve havuz sistemi). Altı ay boyunca balıklar beslenme ve stoklama yoğunluğunun benzer olduğu koşullarda kültüre alınmış; vücut ağırlığı, boy, günlük ağırlık artışı (DWG), spesifik büyüme oranı (SGR), yaklaşık vücut kompozisyonu ve yaşama oranı gibi farklı büyüme parametreleri analiz edilmiştir. Tek cinsiyetli tilapyanın, karma cinsiyetli balıklarla karşılaştırıldığında istatistiksel olarak daha yüksek (P<0,05 ) ağırlık, boy, DWG, SGR ve protein içeriğine sahip olduğu gösterilmiştir. Havuzda kültüre alının balıklar ise diğer 3 kültür sistemindeki balıklarla karşılaştırıldığında istatistiksel olarak daha yüksek (P<0,05) ağırlık, DWG ve protein içeriğine sahip olduğu gösterilmiştir.Karma cinsiyetli ve tek cinsiyetli balıklar içerisinde ve farklı kültür sistemleri arasında yaşama oranında istatistiksel olarak anlamlı fark bulunmamıştır (P>0,05). Havuz kültür sistemlerindeki tek cinsiyetli tilapiyanın en yüksek ağırlığa, DWG ve protein içeriğine sahip olurken, rezervuar kültür sistemindeki karma cinsiyetli tilapiyanın en düşük ağırlığa, DWG ve protein içeriğine sahip olduğu gösterilmiştir. Bu çalı...

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“…The higher growth of mono-sex tilapia may have been due to the influence of methyl testosterone hormone used for sex-reversal. This hormone has been shown to be a growth promoter in O. mossambicus (Kuwaye et al, 1993).…”

Section: Resultsmentioning

confidence: 99%

OVER-WINTERING GROWTH PERFORMANCE OF MIXED-SEX AND MONO-SEX NILE TILAPIA Oreochromis niloticus IN THE NORTHEASTERN BANGLADESH

Siddik¹,

Nahar²,

Ahsan³

et al. 2014

CJF

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The study was conducted to assess the over-wintering growth performance of mixed-sex and mono-sex male tilapia, Oreochromis niloticus. The experiment was carried out with two treatments each with three replicates for a period of 6 months from October 2012 to March 2013 in the Field Laboratory Complex, Bangladesh Agricultural University. In the first treatment (T 1 ), mixed-sex tilapia was stocked in 3 ponds with a mean initial weight of 4.80±0.18 g. In the second treatment (T 2 ), mono-sex male tilapia was stocked in another 3 ponds with a mean initial weight of 4.81±0.20 g. Fish were fed at the rate of 6% of fish body weight at the beginning of the experiments, then the feeding rates were gradually reduced to 2% for the third month and finally increased to 3% for the rest of the period. Water parameters in terms of temperature, dissolved oxygen, pH, transparency, alkalinity, ammonia and nitrite were within the range of fish farming. After 6 months of culture period, mono-sex male tilapia attained a significantly (P<0.05) higher mean final weight and specific growth rate, compared to that of mixed-sex tilapia. However, there was no significant (P>0.05) difference of food conversion ratio and survival rate (%) values between the treatments. The benefit-cost ratio was calculated as 1.17 and 1.43 for mixed-sex and mono-sex male tilapia, respectively. The results suggested that it is possible to successfully culture tilapia during the winter period in Bangladesh, and the culture of mono-sex tilapia is more profitable due to its higher growth rate.

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Effect of 17α-methyltestosterone on the growth of the euryhaline tilapia, Oreochromis mossambicus, in fresh water and in sea water

Cited by 80 publications

References 20 publications

COMPARATIVE GROWTH PERFORMANCE OF MALE MONOSEX AND MIXED SEX NILE TILAPIA (Oreochromis niloticus L.) REARED IN EARTHEN PONDS

COMPARATIVE GROWTH PERFORMANCE OF MALE MONOSEX AND MIXED SEX NILE TILAPIA (Oreochromis niloticus L.) REARED IN EARTHEN PONDS

Untitled

OVER-WINTERING GROWTH PERFORMANCE OF MIXED-SEX AND MONO-SEX NILE TILAPIA Oreochromis niloticus IN THE NORTHEASTERN BANGLADESH

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