scholarly journals Regulation of oocyte maturation in the rainbow trout,Salmo gairdneri: role of cyclic AMP in the mechanism of action of the maturation inducing steroid (MIS), 17α-hydroxy, 20β-dihydroprogesterone

1986 ◽  
Vol 2 (1-4) ◽  
pp. 65-74 ◽  
Author(s):  
B. Jalabert ◽  
B. Finet
Keyword(s):  
Rainbow Trout ◽  
Cyclic Amp ◽  
Oocyte Maturation ◽  
Mechanism Of Action ◽  
Salmo Gairdneri

Role of Cyclic AMP (cAMP) in the Mechanism of Action of Hypothalamic Hypophysiotropic Hormones

2015 ◽  
pp. 267-275
Author(s):  
T. Kaneko ◽  
H. Oka ◽  
M. Munemura ◽  
S. Saito ◽  
N. Yanaihara
Keyword(s):  
Cyclic Amp ◽  
Mechanism Of Action

The role of sample depth in storing chilled rainbow trout (Salmo gairdneri) semen under oxygen

Aquaculture ◽  
1987 ◽  
Vol 61 (3-4) ◽  
pp. 275-279 ◽  
Author(s):  
J. Stoss ◽  
L. Geries ◽  
W. Holtz
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Sample Depth

Role of gravel substrate on ova survival and alevin emergence of rainbow trout, Salmo gairdneri

1981 ◽  
Vol 59 (4) ◽  
pp. 629-636 ◽  
Author(s):  
Larry D. Witzel ◽  
Hugh R. MacCrimmon
Keyword(s):  
Rainbow Trout ◽  
Incubation Temperature ◽  
Salmo Gairdneri ◽  
Void Space ◽  
Poor Survival ◽  
Percent Survival ◽  
Gravel Size ◽  
Wet Weight ◽  
Developmental Condition

The role of gravel size of unigranular diameters 2, 4, 8, 16, and 26.5 mm on ova survival and subsequent emergence of rainbow trout alevins is examined using a vertical-flow incubation apparatus. Survival to emergence, time of emergence, and alevin condition at emergence were signficantly influenced [Formula: see text] by gravel size. Mean percent survival to emergence increased with gravel size from a minimum of 1% in the 2-mm gravel to a maximum of 76% in the 26.5-mm gravel. Survival of control ova from gravel-free incubator was 88% to swim-up stage. Differences in percent survival were most significant within the 2 to 8 mm range. Poor survival of trout alevins in the finer gravels (2–4 mm) was the result of insufficient void space (entrapment). Days to first (43–58 days after ova burial) and 50% emergence (49–62 days after ova burial) also increased with gravel size. At a mean incubation temperature of 10.6 °C, the total emergence days was greatest (40 days) from the 8-mm gravel and occurred prematurely on day 37 after ova burial in 2-mm gravel. Alevin length and weight varied directly with gravel size, ranging from 2.17 to 2.39 cm and 11.9 to 126.8 mg, respectively. Larger alevins, which emerged later from coarser gravels had the least yolk reserve [Formula: see text] and the lowest KD values [Formula: see text], where KD is a developmental condition factor calculated from the ratio of wet weight to standard length. Premature emergence of free embryos and shortening of the alevin îmergence period in 2.0-mm gravel is identified as a stress response.

scholarly journals IDENTIFICATION AND QUANTIFICATION OF STEROIDS IN THE SERUM OF RAINBOW TROUT DURING SPERMIATION AND OOCYTE MATURATION

1980 ◽  
Vol 85 (3) ◽  
pp. 371-378 ◽  
Author(s):  
C. M. CAMPBELL ◽  
A. FOSTIER ◽  
B. JALABERT ◽  
B. TRUSCOTT
Keyword(s):  
Rainbow Trout ◽  
Oocyte Maturation ◽  
Salmo Gairdneri ◽  
Female Fish ◽  
Final Oocyte Maturation ◽  
Lower Vertebrates ◽  
High Concentrations ◽  
Identification And Quantification

17α-Hydroxy-20β-dihydroprogesterone and 17α-hydroxyprogesterone were found in higher concentrations in serum from female Salmo gairdneri undergoing final oocyte maturation immediately before ovulation than in serum from spermiating male trout. Other steroids (11-deoxycorticosterone, 11-deoxycortisol and progesterone) which have been implicated in oocyte maturation and/or ovulation in lower vertebrates were not identified at such high concentrations and the differences between the serum of both sexes were not so great. These results confirm that 17α-hydroxy-20β-dihydroprogesterone and 17α-hydroxyprogesterone, the most potent inducers of trout oocyte maturation in vitro, are present in the blood when oocyte maturation occurs. The concentration of testosterone was found to be higher in serum from female than from male trout indicating that testosterone is unlikely to be the principal androgen in trout. High concentrations of 11-oxotestosterone in male and barely detectable levels in female fish support the hypothesis that 11-oxotestosterone is an important androgen in the regulation of testicular activity.

Some Chemical Signals in the Spawning Behavior of Rainbow Trout (Salmo gairdneri)

1973 ◽  
Vol 30 (7) ◽  
pp. 995-997 ◽  
Author(s):  
C. Newcombe ◽  
G. Hartman
Keyword(s):  
Rainbow Trout ◽  
Chemical Signals ◽  
Salmo Gairdneri ◽  
Auditory Stimuli ◽  
Spawning Behavior ◽  
Olfactory Information ◽  
Males And Females ◽  
Chemical Stimuli

In a two-choice maze ripe rainbow trout (Salmo gairdneri) of both sexes showed positive responses to chemical (probably olfactory) information. The possibility that visual or auditory stimuli influenced choice of channel in the maze was ruled out. Both males and females were strongly attracted to water taken from behind fish that were spawning and weakly attracted to the holding water of ripe fish that were not spawning. Brief speculation is offered about the role of chemical stimuli in the behavior of prespawning and spawning trout.

Role of Rearing Experience in Gravel Substrate Selection by Juvenile Rainbow Trout, Salmo gairdneri

1976 ◽  
Vol 33 (2) ◽  
pp. 282-284 ◽  
Author(s):  
Hugh R. MacCrimmon ◽  
Christopher M. Hawkins
Keyword(s):  
Rainbow Trout ◽  
Statistical Evidence ◽  
Salmo Gairdneri ◽  
Laboratory Studies ◽  
Substrate Selection ◽  
Juvenile Rainbow Trout

Laboratory studies on hatchery-reared wild juvenile rainbow trout (Salmo gairdneri) in an experimental raceway show no significant selection (P < 0.05) of test gravel substrates under either nonflowing or flowing (0.03 m/s) conditions regardless of rearing experience. There is no statistical evidence that hatchery conditioning of rainbow trout for gravel substrate selection is likely to be a feasible undertaking.

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