The influence of three dietary non-protein levels on fecundity and fertility in the guppy Poecilia reticulata [carbohydrates, lipids]
1980
Dahlgren, B.T. (Lund Univ. (Sweden). Dept. of Animal Ecology)
Feeding experiments were carried out to examine the effects of different amounts of dietary non-protein (carbohydrates and lipids) on fecundity and fertility in the guppy. Poecilia reticulata (Peters). There were no significant differences in total body length between females given different amounts of non-protein food, but females given 85% non-protein diet had a significantly higher standard length than females given 69 or 53% non-protein components. A significantly higher total body weight was also found in the groups fed on 85% non-protein diet than among females given 53% non-protein. The frequencies of females with only intrafollicular embryos or with both embryos and ova alternatively with only previtellogenic oocytes in the ovary were not significantly different between populations fed on different non-protein contents. In the group given 69% non-protein the frequency of females with only ova was significantly higher than among females fed on 53% non-protein. The ovarian width, ovarian volume and gonad weight were all significantly higher in females given 85% non-protein than in females fed on 53% non-protein. There were no significant differences of fecundity and fertility between any groups given different amounts of non-protein (85, 69 and 53%). This was also true for embryo size and ovum diameter.
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