Diet and temperature affect liver lipids and membrane properties in steelhead trout ( Oncorhynchus mykiss )

2021 ◽  
Author(s):  
Manjusri P. A. Wijekoon ◽  
Christopher C. Parrish ◽  
Daria Gallardi ◽  
Kaushik Nag ◽  
Atef Mansour
Keyword(s):  
Oncorhynchus Mykiss ◽  
Membrane Properties ◽  
Steelhead Trout ◽  
Liver Lipids

The effects of hatchery and wild ancestry and experience on the relative ability of steelhead trout fry (Oncorhynchus mykiss) to avoid a benthic predator

1995 ◽  
Vol 52 (11) ◽  
pp. 2476-2482 ◽  
Author(s):  
Barry A. Berejikian
Keyword(s):  
Oncorhynchus Mykiss ◽  
Predator Avoidance ◽  
Laboratory Experiments ◽  
Test Period ◽  
Natural Environments ◽  
Steelhead Trout ◽  
Visual Exposure ◽  
Natural Stream ◽  
Relative Ability ◽  
Better Than

Differences in selection regimes between hatchery and natural environments and environmental stimuli, among other factors, have the potential to cause differences in predator avoidance ability between hatchery and wild steelhead trout fry (Oncorhynchus mykiss). In two separate laboratory experiments, fry raised from eggs of wild Quinault River steelhead trout survived predation by prickly sculpin (Cottus asper) significantly better than size-matched offspring of a locally derived hatchery population, which were reared under similar conditions. Wild fry also survived predation better than hatchery fry in natural stream enclosures over a 3-day test period. Experience, in the form of 50-min visual exposure to sculpin predation on "sacrificial" steelhead trout, improved the ability of fry from both populations to avoid predation by sculpin. Wild-experienced fry were eaten in the fewest number of trials followed by wild-naive, hatchery-experienced, and hatchery-naive fry. The results of this study are consistent with the hypothesis that innate predator avoidance ability has been negatively altered through domestication and that attempts to condition hatchery-reared steelhead to avoid predators may be limited for domesticated populations.

Duration in captivity affects competitive ability and breeding success of male but not female steelhead trout (Oncorhynchus mykiss)

2020 ◽  
Vol 77 (6) ◽  
pp. 1000-1009
Author(s):  
Barry A. Berejikian ◽  
Christopher P. Tatara ◽  
Donald M. Van Doornik ◽  
Michael A. Humling ◽  
Matt R. Cooper ◽  
...  
Keyword(s):  
Oncorhynchus Mykiss ◽  
Body Mass ◽  
Breeding Success ◽  
Competitive Ability ◽  
Natural Populations ◽  
Male Dominance ◽  
Steelhead Trout ◽  
Precocious Males ◽  
In Captivity ◽  
Breeding Groups

Female steelhead trout (Oncorhynchus mykiss) reared for 1 year (traditional, “S1”) and 2 years (experimental, “S2”) in captivity in the Methow River Basin, Washington, produced very similar numbers of offspring in replicate spawning channels over 3 consecutive years. In contrast, S1 anadromous males outcompeted S2 males for access to nesting females and, as a result, produced significantly more offspring. Male dominance was positively associated with body mass, but body mass did not account for differences between S1 and S2 males. Much smaller precocious S2 males that matured during rearing in hatchery raceways sired offspring in all six breeding groups. Contributions from precocious males were nearly always the result of sneak spawning events, although on rare occasions, precocious males were able to stimulate females to spawn in the absence of an anadromous male. Similarities in female breeding success suggest that S1 and S2 hatchery steelhead should exhibit similar productivity under natural conditions, but S1 male steelhead may result in greater rates of gene flow from hatchery to natural populations.

Immunohistochemical localization of rhamnose-binding lectins in the steelhead trout (Oncorhynchus mykiss)

2002 ◽  
Vol 26 (6) ◽  
pp. 543-550 ◽  
Author(s):  
H. Tateno ◽  
T. Yamaguchi ◽  
T. Ogawa ◽  
K. Muramoto ◽  
T. Watanabe ◽  
...  
Keyword(s):  
Oncorhynchus Mykiss ◽  
Immunohistochemical Localization ◽  
Steelhead Trout

Redside shiner (Richardsonius balteatus) shoals provide a behavioral competitive refuge for subordinate juvenile steelhead trout (Oncorhynchus mykiss)

2001 ◽  
Vol 58 (2) ◽  
pp. 319-324 ◽  
Author(s):  
Craig A Tinus ◽  
Gordon H Reeves
Keyword(s):  
Oncorhynchus Mykiss ◽  
Steelhead Trout ◽  
Natural Substrate ◽  
Stream Channels ◽  
Redside Shiner ◽  
Richardsonius Balteatus

We examined the relative effects of zero, three, and nine redside shiner (Richardsonius balteatus) on the aggression-related damage among three juvenile steelhead (Oncorhynchus mykiss) in aquaria at 15 and 20°C. No steelhead died when in the presence of nine redside shiner. When redside shiner were not present, mortality among the smallest steelhead was 80%. Thus, the survival of smaller juvenile steelhead was significantly enhanced by the presence of redside shiner. A second experiment was conducted in 6800-L stream channels at 15°C with natural substrate. In separate trials, 10 and 7 steelhead were held either alone or with 20 redside shiner. In the absence of redside shiner, fin damage was significantly greater among smaller steelhead. In both experiments, if a redside shiner group was present, the smallest steelhead frequently took refuge within the shiner group, thereby avoiding attack by dominant steelhead. We have termed this phenomenon a behavioural competitive refuge.

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