ISSN:
1432-0878
Keywords:
Adenohypophysial cells
;
Neurohypophysis
;
Lebistes reticulatus
;
Osmoregulatory mechanism
;
Light microscopy, Morphometry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The pituitary of the larval guppy, Lebistes reticulatus (Peters), was investigated cytologically in relation to the osmotic properties of the environment. In larvae of Stage I, removed from the mother about one week before birth, the sizes of the nuclei of the prolactin, STH, ACTH, and pars intermedia cells were small. The nuclei of these cell types became larger when Stage I larvae were transferred into fresh water (F. W.); however, these animals did not survice. In Stage-II larvae, removed from the mother just before birth, the nuclei of the abovementioned adenohypophysial cells were larger than those of the Stage-I larvae. Stage-II larvae were able to survive in F. W. Thus, it seem that osmoregulatory mechanisms in the larval guppy develop between Stages I and II. The nuclei of prolactin, STH, ACTH and pars intermedia cells decreased significantly in size after birth (0-hr). When larvae of the 0-hr group were immersed in 1/3 sea water (S. W.), only the nuclei of the ACTH cells increased in size. The neurohypophysis of Stage-I larvae contained a very small amount of aldehyde-fuchsin (AF)-positive material, while the neurohypophysis of Stage-II and 0-hr fish was rich in this material. When Stage-I larvae were immersed in F. W., the neurohypophysis showed as great an accumulation of AF-positive material as Stage-II and 0-hr fish.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00311352
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