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Elevated plasma leptin levels of fasted rainbow trout decrease rapidly in response to feed intake.

Marcus Johansson1, Björn Thrandur Björnsson1

  • 1Fish Endocrinology Laboratory, Department of Biological and Environmental Sciences, University of Gothenburg, Box 463, S-40590 Gothenburg, Sweden.

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Summary

In rainbow trout, plasma leptin levels rapidly decrease after feeding begins, indicating nutrient intake overrides leptin

Keywords:
FastingFood intakeLeptinRefeedingSalmonid fish

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Area of Science:

  • * Endocrinology and Fish Physiology

Background:

  • * Leptin is known to suppress appetite (anorexigenic effect) and regulate energy in fish.
  • * Its precise role in short-term feeding responses remains to be fully elucidated.

Purpose of the Study:

  • * To investigate the physiological role of leptin in rainbow trout.
  • * To examine the short-term response of plasma leptin to feeding after fasting.

Main Methods:

  • * A salmonid leptin radioimmunoassay was used to measure plasma leptin levels.
  • * Fish were assessed after a fasting period and during a refeeding period.

Main Results:

  • * Plasma leptin levels differed based on nutritional status and feeding initiation.
  • * Feeding fish showed rapidly decreasing leptin levels within 24 hours.
  • * Non-feeding fish maintained high plasma leptin levels.

Conclusions:

  • * The anorexic effect of leptin is overcome upon feeding initiation.
  • * Decreased plasma leptin levels are associated with nutrient availability in the gastrointestinal tract.