Empirical and predictive effectiveness of stages in controlled reproduction of African catfish Clarias gariepinus burchell 1822 – the effect of female body weight

• Autorzy: Brzuska E.

Warianty tytułu

PL

Empiryczne i predykcyjne efekty etapów kontrolowanego rozrodu suma afrykańskiego Clarias gariepinus burchell 1822 – wpływ masy ciała samic

• Języki publikacji: EN

Abstrakty

EN

The results of stages in controlled reproduction of African catfish C. gariepinus were investigated in females in six classes of body weight (I: >0 ≤1.5 kg; II: >1.5 kg ≤2.5 kg; III: >2.5 kg ≤3.5 kg; IV: >3.5 kg ≤4.5 kg; V: >4.5 kg ≤6.5 kg; VI: >6.5 kg), their ovulation being stimulated with Ovopel (1 pellet kg–1). The accepted classification significantly (P≤0.01) differentiated the weight of obtained eggs expressed both in grams and in percentage of female body weight. The highest weight of eggs was obtained from the heaviest fish (class VI) and the lowest from these of the lowest weight (class I) (1191.8 g and 218.7 g respectively) while in these two classes the obtained highest weight of eggs was expressed as the percentage of female body weight (14.21% and 20.19% respectively). The class of body weight significantly (P≤0.01) determined also the two investigated traits which described the quality of eggs. The lowest value of the least squares means for the percentage of fertilization and of live embryos was noted for the heaviest fish (class VI) (64.75% and 54.63% respectively) and the highest for the fish of the lowest weight, i.e., classes I and II (91.67% and 88.17%, 92.47% and 86.33%). In general the highest effectiveness of reproduction characterized the class of females whose body weight exceeded 4.5 kg but did not rise above 6.5 kg. In order to predict the weight of eggs [g], percentage of fertilization [12 h] and percentage of live embryos [24 h] within the investigated classes the regression equation was introduced using the weight of females as an independent variable. For each class regression equations were also derived in which the weight of females and weight of eggs were accepted as independent variables while the percentages of fertilization and of live embryos were used as dependent variables. The value of empirical data concerning the weight of eggs [g], fertilization percentage [12 h] and percentage of live embryos [24 h] were the basis for deriving a square function which permitted spatial prediction of the distribution of points of these variables on a plane – for each class of female body weight separately.

PL

Badano wyniki etapów kontrolowanego rozrodu samic suma afrykańskiego Clarias gariepinus należących do sześciu klas masy ciała (I: >0 ≤1,5 kg; II: >1,5 kg ≤2,5 kg; III: >2,5 kg ≤3,5 kg; IV: >3,5 kg ≤4,5 kg; V: >4,5 kg ≤6,5 kg; VI: >6,5 kg), u których stymulowano owulację Ovopelem (1 pellet kg–1). Przyjęta klasyfikacja różnicowała istotnie (P≤0,01) masę ikry wyrażoną tak w gramach, jak i w procencie masy ciała ryb. Najwyższą masę jaj pozyskano od ryb najcięższych – klasa VI, a najniższą od najlżejszych – klasa I (odpowiednio 1191,8 g i 218,7 g), przy czym w tych dwóch klasach uzyskano najwyższą masę jaj wyrażoną jako procent masy ciała samic (odpowiednio 14,21% i 20,19%). Klasa masy ciała determinowała istotnie (P≤0,01) również dwie badane cechy określające jakość pozyskanej ikry. Najniższą wartość średniej najmniejszych kwadratów dla procentu zapłodnienia i żywych zarodków odnotowano dla ryb najcięższych (klasa VI) – odpowiednio 64,75% i 54,63%, a najwyższą dla ryb najlżejszych (klasa I i II) – odpowiednio 91,67% i 88,17% oraz 92,47% i 86,33%. Najwyższą efektywnością rozrodu charakteryzowała się klasa samic, których masa ciała przekraczała 4,5 kg, ale nie była wyższa niż 6,5 kg. W celu predykcji masy ikry [g], procentu zapłodnienia (12 godz.) oraz procentu żywych zarodków [24 godz.] w obrębie badanych klas wyprowadzono równania regresji, wykorzystując masę samic jako zmienną niezależną. Dla każdej klasy wyprowadzono również równania regresji, w których jako zmienne niezależne przyjęto masę samicy i masę ikry, a jako zmienne zależne – procent zapłodnienia i żywych zarodków. Wartości danych empirycznych odnośnie do masy jaj [g], procentu zapłodnienia (12 godz.) oraz procentu żywych zarodków [24 godz.] stanowiły podstawę do wyprowadzenia funkcji kwadratowej pozwalającej na przestrzenną predykcję rozkładu punktów tych zmiennych na płaszczyźnie – oddzielnie dla każdej klasy masy ciała samic.

• Wydawca: -
• Czasopismo: Polish Journal of Natural Sciences
• Rocznik: 2012
• Tom: 27
• Numer: 4
• Opis fizyczny: p.433-452,fig.,ref.

Twórcy

autor

Brzuska E.

• Institute of Ichthyobiology and Aquaculture in Gołysz Polish Academy of Sciences

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