The three-spined stickleback is a secondary intermediate host for the hermaphroditic parasite Schistocephalus solidus, a tapeworm of fish and fish-eating birds.

Identification: Small, streamlined torpedo shaped fish. Its common name is derived from the presence of three (occasionally 2-4) sharp spines on the back forward of the dorsal fin. Dorsal fin is broad and has 10-14 soft rays; caudal fin contains 10 rays. Freshwater populations vary in body shape depending on the type of habitat it occupies.

A diminutive but aggressive predator, the three-spined stickleback hunts tadpoles and small fish. It is also known for fiercely protecting its nest of eggs until they hatch. Look for it in ponds, lakes and rivers.

The three-spined stickleback (Gasterosteus aculeatus) is a species of stickleback in the genus Gasterosteus. It is found in most inland and coastal waters north of 30°N.

The three-spined stickleback (Gasterosteus aculeatus) is a fish native to most inland and coastal waters north of 30°N. It has long been a subject of scientific study for many reasons.

“The introduction of arctic charr and three-spined stickleback altered the Takvatn pelagic food web, increasing species richness beyond the mere addition of the two introduced species by facilitating the establishment of several hitchhiking or independently arriving parasite species and constituting essential food resources for new avian ...

Distinguished uniquely from its congeners in Europe by having trunk and caudal peduncle covered by a complete series of 29-35 bony scutes. Other characters important to separate this species from other species of the genus include posterior edge of scutes crenulated and scutes forming a lateral keel on caudal peduncle.

The threespine stickleback is about four inches in length. It is silver-green to brown on its back and upper body. The sides are silver, often with dark blotches. A large male may be black with red on the fins. A large female has a pink throat and belly. There are no scales.

2023年11月12日 · Gasterosteus aculeatus, more commonly known as the three-spined stickleback, is a small cold water fish species particularly widespread in northern Europe.

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.