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The three-spined stickleback is a secondary intermediate host for the hermaphroditic parasite Schistocephalus solidus, a tapeworm of fish and fish-eating birds. The tapeworm passes into sticklebacks through its first intermediate hosts, cyclopoid copepods, when these are eaten by the fish.
The Icelandic threespine stickleback (Gasterosteus islandicus) is a freshwater fish, and one of the few vertebrate species endemic to Iceland. In some literature it is considered as a subspecies of G. aculeatus, [2] though several authorities offer it full species status. [3] [4] It was first described by French biologist Henri Émile Sauvage ...
West of Barca Slough, San Antonio Creek is inhabited by the endangered Unarmored Three-spined stickleback (Gasterosteus aculeatus williamsoni) which, for all practical purposes, prohibits any stream maintenance. [2]
The maximum size of the best-known species, the three-spined stickleback (Gasterosteus aculeatus), is about 4 inches, but few of them are more than 3 inches long. They mature sexually at a length of about 2 inches. [11] Most other stickleback species are roughly similar in size or somewhat smaller.
Two subspecies of three-spined stickleback (Gasterosteus aculeatus) are endemic to southern California – the unarmored threespine stickleback (G. a. williamsoni) and the Santa Ana stickleback (G. a. santaeannae). [1] Steelhead (Onchorhynchus mykiss) in Maria Ygnacio Creek, Santa Barbara County, California.
Prevalence — the proportion of host population infected — in naturally infected populations of the first intermediate hosts is likely low. [5] Conversely, in populations where Schistocephalus solidus infects the second intermediate host (three-spined stickleback) it can reach high prevalence, up to 93% in both European and North American populations [6] [7]
Gasterosteus nipponicus differs from the three-spined stickleback in that the lateral plates are complete and that they suddenly reduce in size over the anus, the depth of lateral plate over the anus less than 60% of the depth of the deepest plate. In addition the caudal keels are thin and membrane-like.
It was a freshwater benthopelagic fish, up to 6.5 centimetres (2.6 in) SL in length. It is considered extinct due to hybridization with the three-spined stickleback following irrigation which allowed the two taxa to mix by diluting the hypersaline water barrier which separated them. The last known occurrence of the species was in the 1960s.