Related Experiment Video
Updated: Jun 13, 2026
16:21
Quantifying Fish Swimming Behavior in Response to Acute Exposure of Aqueous Copper Using Computer Assisted Video and Digital Image Analysis
Published on: February 26, 2016
Salmon spawning migration: metabolic shifts and environmental triggers
Kristina M Miller1, Angela D Schulze, Norma Ginther
1Molecular Genetics Section, Pacific Biological Station, 3190 Hammond Bay Road, Fisheries and Oceans Canada, Nanaimo, BC, Canada V9T 6N7. Kristi.Miller@dfo-mpo.gc.ca
Summary
Wild sockeye salmon exhibit significant metabolic shifts during their 1300 km migration, adapting muscle functions to starvation and environmental changes. Key findings reveal novel insights into proteasomal proteolysis and genome-wide transcriptional responses.
Area of Science:
- * Functional genomics
- * Fish physiology
- * Environmental adaptation
Background:
- * Wild sockeye salmon undertake extensive migrations to spawn.
- * Metabolic adaptations are crucial for survival during long-distance, non-feeding migrations.
- * Understanding these adaptations informs conservation efforts for migratory fish.
Purpose of the Study:
- * To investigate genome-wide transcriptional shifts in white muscle during sockeye salmon migration.
- * To identify metabolic responses to starvation and changing environments (saltwater, estuarine, freshwater).
- * To uncover novel molecular mechanisms, including proteasomal proteolysis, involved in salmon migration.
Main Methods:
- * Large-scale functional genomics study analyzing gene expression in white muscle.
- * Monitoring of sockeye salmon during their migration from the ocean to spawning grounds.
- * Analysis of transcriptional changes in response to environmental transitions and physiological states.
Main Results:
- * Early starvation responses included enhanced protein turnover and reduced muscle protein synthesis.
- * Estuarine entry induced massive protein turnover and a shift to oxidative phosphorylation.
- * High river temperatures triggered immune responses and significant mortality, while spawning grounds saw further metabolic shifts and proteolysis.
Conclusions:
- * Sockeye salmon exhibit complex, stage-specific metabolic reprogramming during migration.
- * Proteasomal proteolysis is a key, novel mechanism activated during migration.
- * Environmental factors like temperature significantly impact survival and physiological responses.
Related Concept Videos
00:53Migration
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
02:32Osmoregulation in Fishes
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
01:46Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
01:07Speciation Rates
Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
01:06Fixed Action Patterns
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...