Rearing conditions and sociability in Lebistes reticulatus

An Electron Microscope Study of Yolk Formation during Oogenesis in Lebistes Reticulatus Guppyi

The present investigation describes the fine structural changes that occur during proteid yolk formation in the developing oocytes of the guppy (Lebistes reticulatus), an ovoviviparous teleost. These changes suggest the operation of a number of different intra- and extraoocyte processes that may account for the synthesis and deposition of the proteid yolk. Early in oogenesis, the egg's Golgi sy...

Effects of Estradiol Hormone on the Maturation of the Gonads and Associated Duct System of the Fish Lebistes reticulatus

It was the purpose of this study to describe the secondary sex characters and the histological appearance of the gonads, including the associated duct system, of the fish Lebistes reticulatus from birth through differentiation and maturation when subjected to the hormone estradiol. Sixtyfour Lebistes reticulatus were fed 0.125 mg of estradiol, beginning at birth, at intervals of 60 hours. An eq...

Rearing conditions and ethanol consumption by rats.

Population genetics of Lebistes (Poecilia) reticulatus Peters (Poeciliidae; Pisces). I. Effects of radiation-induced mutations on the segregation ratio in postirradiation F 2 .

Wild-type germ cells of the viviparous fish, Lebistes (Poecilia) reticulatus, were irradiated in the stages of oogonia, spermatogonia or spermatozoa with 1000 R of X rays at a dose-rate of 200-220 R/min. The grown-up fish were mated after irradiation or sham treatment to unirradiated mutant fish homozygous for three recessive gene loci, causing albinism, lack of yellow and reddish pigmentation ...

Effects of social rearing conditions on conditioned suppression in rats.

Twenty-two rats were reared in standard conditions during the first two months of their life. Then the animals were divided into two groups exposed to different rearing conditions. Twelve animals (Group SO) were housed socially, six animals per cage, and for three weeks they were subjected to sensory stimulation in an enriched environment. The other ten subjects were kept individually (Group IN...