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Related Concept Videos

Migration00:53

Migration

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.
Fixed Action Patterns01:06

Fixed 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.
Osmoregulation in Fishes02:32

Osmoregulation 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?
Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
Formation of Species01:31

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Speciation Rates01:07

Speciation 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.

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Related Experiment Video

Updated: Jun 9, 2026

Implantation of a New Micro Acoustic Tag in Juvenile Pacific Lamprey and American Eel
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Implantation of a New Micro Acoustic Tag in Juvenile Pacific Lamprey and American Eel

Published on: March 16, 2019

Oceanic migration and spawning of anguillid eels.

K Tsukamoto1

  • 1Ocean Research Institute, University of Tokyo, Nakano, Tokyo, 164-8639 Japan. ktpc@ori.u-tokyo.ac.jp

Journal of Fish Biology
|August 26, 2010
PubMed
Summary
This summary is machine-generated.

The spawning migrations of anguillid eels in the open ocean remain poorly understood. Research suggests environmental factors influence migration timing, and spawning locations can shift, impacting eel recruitment and survival.

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Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus

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06:36

Incremental Temperature Changes for Maximal Breeding and Spawning in Astyanax mexicanus

Published on: February 14, 2021

Area of Science:

  • Ichthyology
  • Marine Biology
  • Ecology

Background:

  • Life histories of anguillid eels are increasingly understood, yet oceanic spawning migrations of silver eels remain largely unknown.
  • Environmental factors like lunar cycles and river discharge may influence the initiation of eel migrations towards the ocean.

Purpose of the Study:

  • To provide an overview of current knowledge regarding the oceanic migration and spawning of anguillid eel species.
  • To highlight knowledge gaps concerning eel navigation, spawning site selection, and the influence of oceanographic conditions.

Main Methods:

  • Literature review of existing studies on anguillid eel migration and spawning.
  • Analysis of recent findings on the spawning of Japanese eel (Anguilla japonica) in the North Equatorial Current region.
  • Comparison of laboratory-observed spawning behaviors with field observations.

Main Results:

  • Silver eels migrate in the upper ocean layers, continuing reproductive maturation, with navigation methods (magnetic sense, olfaction) still speculative.
  • Spawning of Japanese eels occurs near the West Mariana Ridge during new moons, with latitude varying based on oceanographic conditions.
  • Spawning behaviors in the wild have not been directly observed, but laboratory studies show similarities.

Conclusions:

  • Understanding eel migration and spawning site selection is crucial for conserving declining anguillid eel populations.
  • Variability in spawning locations can significantly affect larval dispersal, survival, and subsequent recruitment success.
  • Further research is essential to elucidate the complexities of oceanic eel reproduction and migration patterns.