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• W2112038186 abstract "Tilapia are one of the most important species in commercial aquaculture world wide. On the one hand this is due to their ability to utilize a broad variety of food sources. On the other hand tilapia show a high resistance towards poor water conditions and handling stress. The white filets have a very good texture and a delicious taste. Hence, the demand for tilapia is steadily increasing especially in the USA and Europe.As mixed-sex tilapia stocks are mainly farmed in extensive systems their high fecundity and reproduction rate results in overcrowding in the ponds. Therefore all-male stocks are highly desirable. Previous investigations in this species showed a strong influence of temperature on sex determination with an underlying genetic basis. Thus, losses in productivity due to stunting of mixed sex Nile Tilapia stocks could be alleviated by production of temperature sensitive lines to sustainably increase the proportion of males by temperature treatment. A two generation selection experiment was conducted starting with 36 families of Oreochromis niloticus from Lake Manzala (Egypt) as base population. The families were screened for their thermal sensitivity in the following way. After a 9 day incubation period at 28°C, fry were subdivided into a control (28°C) and a treatment group, each containing 110 fish. The treatment group was kept at a temperature of 36°C for 10 days. Thereafter treated fry were gradually adapted to 28°C again. Each treatment and corresponding control group was raised separately till sexing. The percentage of males in treatment groups was the selection criteria and the families showing the greatest surplus in their sex ratios compared to their corresponding control groups were selected. Starting with a basepopulation of 36 Manzala strain fullsib families temperature sensitive and non-sensitive lines were developed. The results clearly indicated selection for temperature dependent sex determination is possible. After on generation of upwards selection a male percentage of 83.7% was obtained. After second selection it further augmented to 90.2% males. In contrast downwards selection showed a weak response to selection after first selection. Showing a decrease in the male percentage to 65.2%. Second selection lead to a high response to selection showing a reduction in male percentage of 11.2% to 54%. Due to the fact that no correlated response to selection was observed in the control groups, it is argued that temperature sex determination and genetic sex determination can be described as two distinct traits not being genetically correlated.The results obtained showed that selecting for temperature dependent sex ratios is a feasible approach to redundantise hormone feeding to sexually undifferentiated fry. A high response to selection and a realised heritability of 0.69, clearly demonstrated that temperature sex determination has a highly heritable genetic background. Regarding the high response to selection and realized heritability the action of few major genes causing the bulk of additive variation and minor genes causing the remaining additive variance seem to be responsible for expression of temperature sex determination in Nile Tilapia. Thus, the results obtained showed that it is realistic to obtain a male proportion exceeding 95%, which is necessary to effectively avoid stunting, by means of selection for temperature dependent sex determination.In contrast, prolongation of temperature treatment to 30 days was not able to induce temperature sex reversal in crosses and meiotic gynogenetic offspring of genetic female homozygous isogenic lines. The present study revealed contradictory results regarding sex ratios obtained from such genotypes in earlier investigations. Therefore, his area of research requires further investigations to eliminate contradictory results." @default.
• W2112038186 created "2016-06-24" @default.
• W2112038186 creator A5060567601 @default.
• W2112038186 date "2022-02-20" @default.
• W2112038186 modified "2023-10-01" @default.
• W2112038186 title "Selektionsexperimente zur Erhöhung des Männchenanteils bei Nilbuntbarschen (Oreochromis niloticus) mittels Temperaturbehandlung" @default.
• W2112038186 cites W105159726 @default.
• W2112038186 cites W1481088207 @default.
• W2112038186 cites W1496088369 @default.
• W2112038186 cites W1515105420 @default.
• W2112038186 cites W1603004708 @default.
• W2112038186 cites W1635425035 @default.
• W2112038186 cites W188093647 @default.
• W2112038186 cites W1932619410 @default.
• W2112038186 cites W1953796906 @default.
• W2112038186 cites W195552976 @default.
• W2112038186 cites W1968103382 @default.
• W2112038186 cites W1974562844 @default.
• W2112038186 cites W1974572893 @default.
• W2112038186 cites W1975177346 @default.
• W2112038186 cites W1976004162 @default.
• W2112038186 cites W1978974810 @default.
• W2112038186 cites W1982527090 @default.
• W2112038186 cites W1990215354 @default.
• W2112038186 cites W1990215474 @default.
• W2112038186 cites W1991227264 @default.
• W2112038186 cites W1991820545 @default.
• W2112038186 cites W1993303576 @default.
• W2112038186 cites W1994967993 @default.
• W2112038186 cites W1996689072 @default.
• W2112038186 cites W1997015547 @default.
• W2112038186 cites W2000580623 @default.
• W2112038186 cites W2000819390 @default.
• W2112038186 cites W2001916222 @default.
• W2112038186 cites W2002432052 @default.
• W2112038186 cites W2005061756 @default.
• W2112038186 cites W2006240558 @default.
• W2112038186 cites W2008771657 @default.
• W2112038186 cites W2011617862 @default.
• W2112038186 cites W2012266374 @default.
• W2112038186 cites W2013082510 @default.
• W2112038186 cites W2013246689 @default.
• W2112038186 cites W2013355786 @default.
• W2112038186 cites W2013772510 @default.
• W2112038186 cites W2017347893 @default.
• W2112038186 cites W2019962508 @default.
• W2112038186 cites W2021271246 @default.
• W2112038186 cites W2022544088 @default.
• W2112038186 cites W2026633779 @default.
• W2112038186 cites W2026707427 @default.
• W2112038186 cites W2027504689 @default.
• W2112038186 cites W2033860103 @default.
• W2112038186 cites W2037638681 @default.
• W2112038186 cites W2039459110 @default.
• W2112038186 cites W2042509802 @default.
• W2112038186 cites W2043895544 @default.
• W2112038186 cites W2045817494 @default.
• W2112038186 cites W2050945942 @default.
• W2112038186 cites W2053633225 @default.
• W2112038186 cites W2053812675 @default.
• W2112038186 cites W205783439 @default.
• W2112038186 cites W2059361677 @default.
• W2112038186 cites W2060450697 @default.
• W2112038186 cites W2061047427 @default.
• W2112038186 cites W2064756910 @default.
• W2112038186 cites W2066491171 @default.
• W2112038186 cites W2067493796 @default.
• W2112038186 cites W2069565590 @default.
• W2112038186 cites W2071756471 @default.
• W2112038186 cites W2073124870 @default.
• W2112038186 cites W2073701242 @default.
• W2112038186 cites W2084840774 @default.
• W2112038186 cites W2085346925 @default.
• W2112038186 cites W2085422902 @default.
• W2112038186 cites W2085770487 @default.
• W2112038186 cites W2087490640 @default.
• W2112038186 cites W2087868680 @default.
• W2112038186 cites W2088005432 @default.
• W2112038186 cites W2089932540 @default.
• W2112038186 cites W2092328669 @default.
• W2112038186 cites W2092903905 @default.
• W2112038186 cites W2094941213 @default.
• W2112038186 cites W2095914577 @default.
• W2112038186 cites W2096358462 @default.
• W2112038186 cites W2098452577 @default.
• W2112038186 cites W2102190537 @default.
• W2112038186 cites W2102904966 @default.
• W2112038186 cites W2105750787 @default.
• W2112038186 cites W2112146544 @default.
• W2112038186 cites W2115263123 @default.
• W2112038186 cites W2119330634 @default.
• W2112038186 cites W2140388218 @default.
• W2112038186 cites W2141088880 @default.
• W2112038186 cites W2141994005 @default.
• W2112038186 cites W2149689733 @default.
• W2112038186 cites W2151879519 @default.
• W2112038186 cites W2152624584 @default.
• W2112038186 cites W2158436622 @default.
• W2112038186 cites W2162460501 @default.
• W2112038186 cites W2164460703 @default.

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