
1) Acanthopterygian 2) Comic by Ian Edginton 3) Fish 4) Prickleback 5) Pugnacious, fresh water fish 6) Spiny fish 7) Spiny swimmer 8) Spiny-finned fish 9) Subjects of much research
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https://www.crosswordclues.com/clue/stickleback

1) Prickleback
Found on
https://www.crosswordclues.com/clue/stickleback

Culaea Gasterosteus Pungitius The Gasterosteidae are a family of fish including the sticklebacks. FishBase recognises 16 species in the family, grouped in five genera. However, several of the species have a number of recognised subspecies, and the taxonomy of the family is thought to be in need of revision. Although some authorities give the commo...
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http://en.wikipedia.org/wiki/Stickleback

• (v. t.) Any one of numerous species of small fishes of the genus Gasterosteus and allied genera. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct curious nests. Called also sticklebag, sharpling, and prickleback.
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http://thinkexist.com/dictionary/meaning/stickleback/

any of about 12 species of fishes of the family Gasterosteidae (order Gasterosteiformes), found in temperate regions of the Northern Hemisphere. ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/s/162
Stic'kle·back` noun [ Middle English & Prov English
stickle a prickle, spine, sting (AS.
sticel ) +
back . See
Stick ,
transitive verb , and confer
Banstickle .]
(Zoology) Any one of numerous species of small fishes of the genus
G...Found on
http://www.encyclo.co.uk/webster/S/197

Sticklebacks (Gastrosteus) are a group of small fishes so called from the spines on their back. Three species occur in Great Britain, and are known as the three-spined, ten-spined and fifteen-spined, the first two being freshwater species and the third marine. The three-spined stickleback being the most common. In the breeding season the male stick...
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http://www.probertencyclopaedia.com/browse/BSB.HTM

USS Stickleback was an American Balao Class submarine of 1525 tons displacement launched in 1944. USS Stickleback was powered by diesel engines providing a top speed of 21 knots, carried a complement of 75 and was armed with one 4-inch gun, two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern torpedo tubes.
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http://www.probertencyclopaedia.com/browse/RSA.HTM

[
n] - small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship
Found on
http://www.webdictionary.co.uk/definition.php?query=stickleback
noun small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research
Found on
https://www.encyclo.co.uk/local/20974

Any fish of the family Gasterosteidae, found in marine and fresh waters of the northern hemisphere. It has a long body that can grow to 18 cm/7 in. The spines along a stickleback's back take the place of the first dorsal fin, and can be raised to make the fish difficult to eat for predators. After the eggs have been laid the female takes no...
Found on
https://www.encyclo.co.uk/local/21221

any of the small, pugnacious, spiny-backed fishes of the family Gasterosteidae, inhabiting northern fresh waters and sea inlets, the male of which builds and guards the nest. Also called
Found on
https://www.infoplease.com/dictionary/stickleback
No exact match found.