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  1. 2 Folia Biologica

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  1. 2 2002

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  1. 1 Calta M.

  2. 1 Ocalewicz K.

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1

Cytogenetic markers for X chromosome in a karyotype of rainbow trout from Rutki strain (Poland)

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Ocalewicz K.
Folia Biologica
|
2002
|
vol. 50
|
issue 1-2
13-16
EN
Cytogenetic or molecular identification of sex chromosomes could help in breeding studies in producing monosex fish stocks, estimating success of androgenesis, gynogenesis, etc. Among fish species sex chromosomes are recognizable in only a few cases. Some populations of rainbow trout Oncorhynchus mykiss show morphologically differentiated sex chromosomes. A strain from Rutki, Poland, showed a heteromorphic pair of subtelocentric chromosome: presumably of the XY type in the male and XX in the female. Restriction endonuclease and DAPI banding resulted in a characteristic banding pattern enabling identification of the X chromosome.
2

Active chloride cell density in some tissues of rainbow trout (Oncorhynchus mykiss Walbaum, 1792) larvae during the early development stage

100%
Calta M.
Folia Biologica
|
2002
|
vol. 50
|
issue 1-2
91-94
EN
In this study, active chloride cell density in some tissues (gill arch epithelium, skin, and yolk-sac membrane) of rainbow trout (Oncorhynchus mykiss Walbaum, 1792) larvae during the early development stage was investigated using a vital fluorescence staining technique. It was found that the numbers of active chloride cells were very variable, depending on the tissue and age of the larvae. Active chloride cells were most abundant in the skin and yolk-sac membrane, but less so in the gill arch epithelium of newly hatched larvae. With larval age, the density of active chloride cells in the gill epithelium increased, while that in the skin and yolk-sac membrane decreased.
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