Fine structure of the rostral pars distalis follicle cells in homotransplanted pituitaries of rainbow trout, Salmo gairdneri

1976 ◽  
Vol 54 (2) ◽  
pp. 122-132 ◽  
Author(s):  
J. F. Leatherland ◽  
L. Lin
Keyword(s):  
Rainbow Trout ◽  
Cell Activity ◽  
Follicle Cells ◽  
Salmo Gairdneri ◽  
Cellular Debris ◽  
Successful Recovery ◽  
Pituitary Glands ◽  
A Site ◽  
Rostral Pars Distalis

Pituitary glands from 'donor' rainbow trout were transplanted into the anterior eye compartment of 'recipient' fish to examine the nature of hypothalamic control of the follicle cells in salmonid fishes and to explore the possibility of using the eye as a site of pituitary implantation that permits successful recovery of the grafted gland. After 7 weeks the transplanted prolactin cells appeared less active than in in situ glands and some of the follicle cells appeared to be undergoing degenerative processes. This inhibition of prolactin cell activity was thought to be due to the higher osmotic pressure of the ocular fluid.The follicular formation of the prolactin and non-granulated cells was retained in transplanted glands, although the follicle lumina were smaller than in in situ glands and commonly contained cellular debris. This may suggest that the lumina are sites of cellular degradation and possibly stores of precursor substances.

Oxygen receptors in the rainbow trout, Salmo gairdneri

1978 ◽  
Vol 56 (6) ◽  
pp. 1254-1259 ◽  
Author(s):  
C. Daxboeck ◽  
G. F. Holeton
Keyword(s):  
Rainbow Trout ◽  
Respiratory Control ◽  
New Technique ◽  
Salmo Gairdneri ◽  
Ventilatory Responses ◽  
Rapid Release ◽  
Branchial Arches ◽  
Oxygen Sensitive ◽  
A New Technique

A new technique for the detection in situ of oxygen-sensitive chemoreceptors in fish is described. By studying the hypoxic responses of the rainbow trout, Salmo gairdneri, at least two loci of respiratory control were found to be operating. One component initiated the hypoxic bradycardia and its rapid release, a second was responsible for ventilatory responses. The anterodorsal region of the first branchial arches has been established as a peripheral oxygen-sensitive chemoreceptor site, mediating bradycardia, without affecting either the amplitude or frequency of breathing. The study does not preclude the existence of oxygen receptors in other areas of the fish.

Risk to Salmonids of Water Quality in the Turkey Lakes Watershed as Determined by Bioassay

1988 ◽  
Vol 45 (S1) ◽  
pp. s127-s135 ◽  
Author(s):  
W. Kwain ◽  
J. R. M. Kelso
Keyword(s):  
Rainbow Trout ◽  
Brook Trout ◽  
Lake Trout ◽  
Exposure Period ◽  
Whole Body ◽  
Salmo Gairdneri ◽  
Number Of Factors ◽  
Metal Levels ◽  
Turkey Lakes Watershed

Batchawana Lake, the headwater lake in the Turkey Lakes Watershed, was devoid offish. Although a number of factors could cause this fishless state, we conducted in situ studies to partially address conditions related to lake acidification. The spring pH depression did not induce significant, consistent mortality to rainbow trout (Salmo gairdneri) or lake trout (Salvelinus namaycush) caged in situ. In 1981, however, considerable mortality occurred to fish caged in Batchawana Lake during or immediately following the maximum spring pH depression. In the remaining lakes, mortality occurred later in the exposure period. Whole-body concentrations of Na+, Ca2+, and Mg2+ in rainbow trout caged (1980) in three lakes of the watershed were similar; however, K+ appeared slightly higher (but not statistically different) in fish held in the headwater lake. Static bioassays indicated that the 96-h pH-LC50 for brook trout (Salvelinus fontinalis) was 3.80–4.09, considerably lower than the lowest pH, 4.66, observed during spring. Brook trout corralled in Batchawana Lake grew slightly faster and accumulated more Pb and Hg than fish held in a downstream lake. Although pH and trace metal levels in Batchawana Lake may at times be inhospitable to fish, other factors likely contributed to the fishless condition of this lake.

Natural Killer Cell Activity in Rainbow Trout (Salmo gairdneri): Effect of Dietary Exposure to Aroclor 1254 and/or Mirex

1987 ◽  
Vol 44 (3) ◽  
pp. 636-638 ◽  
Author(s):  
Glenn B. Cleland ◽  
Ronald A. Sonstegard
Keyword(s):  
Rainbow Trout ◽  
Natural Killer ◽  
Nk Cell ◽  
Natural Killer Cell Activity ◽  
Killer Cell ◽  
Cell Activity ◽  
Dietary Exposure ◽  
Salmo Gairdneri ◽  
Target Cells ◽  
Aroclor 1254

Rainbow trout (Salmo gairdneri) peripheral blood lymphocytes and splenocytes were found to have spontaneous cytotoxic activity against cultured mammalian and fish tumor cell lines. P 815 and YAC 1 target cells were found to be highly sensitive to trout natural killer (NK) cell lysis, while K 562 and ML cells were low and EL 4 was resistant. NK cell activity was not significantly altered by a 12-mo dietary exposure of fish to various concentrations of Aroclor 1254 and/or mirex.

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