The development of the stratum granulosum of the small intestine of the rainbow trout (Salmo gairdneri)

1982 ◽  
Vol 60 (6) ◽  
pp. 1513-1516 ◽  
Author(s):  
T. Bergeron ◽  
Bill Woodward
Keyword(s):  
Small Intestine ◽  
Rainbow Trout ◽  
Granule Cells ◽  
Critical Role ◽  
Salmo Gairdneri ◽  
Chronological Age ◽  
Stratum Granulosum

The ontogeny of the stratum granulosum within the small intestine of the rainbow trout (Salmo gairdneri) was related to the chronological age of the animal. The component granule cells were first seen many weeks after the development of the collagenous stratum compactum. It is therefore concluded that the granule cells do not perform a critical role in stratum compactum formation. In addition, it is proposed that the stratum granulosum develops because of resistance of the stratum compactum to cellular penetration.

Ultrastructure of the granule cells in the small intestine of the rainbow trout (Salmo gairdneri) before and after stratum granulosum formation

1983 ◽  
Vol 61 (1) ◽  
pp. 133-138 ◽  
Author(s):  
T. Bergeron ◽  
Bill Woodward
Keyword(s):  
Rainbow Trout ◽  
Developmental Stages ◽  
Granule Cells ◽  
Protein S ◽  
Salmo Gairdneri ◽  
Stratum Granulosum ◽  
Cytoplasmic Granules ◽  
Large Numbers ◽  
Before And After ◽  
Juvenile Trout

The ultrastructure of the small intestinal granule cells (GC) of the rainbow trout (Salmo gairdneri) was studied in fry and fingerlings before the cells organized to form the stratum granulosum (SG) and in 12-month-old juveniles which possess a well-developed SG several cell diameters in thickness. The GC of juvenile trout exhibit a striking reduction in nucleolar numbers and in the quantity of rough endoplasmic reticulum relative to the GC of younger fish, but contain even greater numbers of large, electron-dense cytoplasmic granules. The final stages of cellular maturation therefore take place in the GC after their organization to form a layer, and the cells appear to lose their capacity to synthesize protein(s) for the cytoplasmic granules. Since the latter structures are, nevertheless, maintained in large numbers in mature GC, it is suggested that they function intact within the cell. No precursor to the granulated form of the GC was identified in the intestine, a result which suggests that the earliest developmental stages of the GC locate within another organ.

Sites of Uptake of Geosmin, a Cause of Earthy-Flavor, in Rainbow Trout (Salmo gairdneri)

1984 ◽  
Vol 41 (8) ◽  
pp. 1224-1226 ◽  
Author(s):  
Jon From ◽  
Viggo Hørlyck
Keyword(s):  
Small Intestine ◽  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Rapid Absorption ◽  
Absorption Sites

To identify absorption sites of earthy-flavor in rainbow trout (Salmo gairdneri), we placed the geosmin-producing algae Symploca muscorum on four locations. We showed that the most rapid absorption occurred in the gills (6 min), followed by the skin (1.5 h), small intestine (4 h), and stomach (7 h). In trout farming, if ingestion of algae is reduced, then the most significant route of uptake of geosmin will be through the gills and skin.

Temperature Selection of Rainbow Trout (Salmo gairdneri) Fingerlings in Vertical and Horizontal Gradients

1971 ◽  
Vol 28 (11) ◽  
pp. 1801-1804 ◽  
Author(s):  
R. W. McCauley ◽  
W. L. Pond
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Temperature Preference ◽  
Temperature Selection ◽  
Horizontal Gradients ◽  
Significant Difference ◽  
Preferred Temperatures ◽  
Laboratory Investigations ◽  
Horizontal Temperature Gradients ◽  
Selection Of

Preferred temperatures of underyearling rainbow trout (Salmo gairdneri) were determined in both vertical and horizontal temperature gradients. No statistically significant difference was found between the preferred temperatures by the two different methods. This suggests that the nature of the gradient plays a lesser role than generally believed in laboratory investigations of temperature preference.

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