three-spined stickleback
fish
Also known as: Gasterosteus aculeatus
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species of stickleback
- In stickleback
The three-spined stickleback (Gasterosteus aculeatus) is widespread in the Northern Hemisphere in fresh and salt water. It is 5 to 10 cm (2 to 4 inches) long and has three dorsal spines. The nine-spined stickleback (Pungitius pungitius), a species that is similar in size to G.…
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