No, a Stickleback is not an amphibian. Sticklebacks are categorised in the class Actinopterygii (Plural form of Actinopterygius) which constitutes the class of ray-finned fish.
However, if you wish for something less unpronounceable - Fish are a class all their own.
These are the five categories:
1. Mammals
2. Reptiles
3. Amphibians
4. Birds
5. Fish
To simplify it, they are classed merely as 'fish'.
The Stickleback - 1915 was released on: USA: April 1915
The Stickleback - 1913 was released on: USA: 11 March 1913
External, like most fish.
A four-horned sculpin eats a three spined stickleback. Interesting...............................
internal
yes
they have to
bv
A Stickleback is a vertebrate. It has a backbone on it's back. all fishes, reptiles, mammals and birds are all vertebrates.
Nancy Chambers has written: 'Pim and the fisherboy' -- subject- s -: Children's stories 'Stickleback, Stickleback'
Brook stickleback fish live to about one to two years occasionally three years.
apparently unfortunately heck no