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  • Threespine Stickleback, 1 of 6
    Photo 1 of 6

    (c) Riccardo Novaga, some rights reserved (CC BY-NC)

  • Threespine Stickleback, 2 of 6
    Photo 2 of 6

    (c) jqrichmond, some rights reserved (CC BY-NC)

  • Threespine Stickleback, 3 of 6
    Photo 3 of 6

    (c) Kasper Malmberg, some rights reserved (CC BY)

  • Threespine Stickleback, 4 of 6
    Photo 4 of 6

    (c) Valerio Urbani, all rights reserved

  • Threespine Stickleback, 5 of 6
    Photo 5 of 6

    (c) Ernest Keeley, some rights reserved (CC BY-NC)

  • Threespine Stickleback, 6 of 6
    Photo 6 of 6

    (c) Valerio Urbani, all rights reserved

1 of 6 photos

Threespine Stickleback

Gasterosteus aculeatus

Worldwide
10,769 observations
Group
Fish
iNaturalist Wikipedia

About

The three-spined stickleback (Gasterosteus aculeatus) is a fish native to most inland coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation throughout its range, ideal for questions about evolution and population genetics. Most populations are anadromous (they live in seawater but breed in fresh or brackish water) and very tolerant of changes in salinity, a subject of interest to physiologists. It displays elaborate...

Summary from Wikipedia, CC BY-SA 4.0.

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