What fish is this?
- Thread starter Zak
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Yes, that is a three-spiked stickleback, Gasterosteus aculeatus. [It is likely a species complex with multiple cryptic species.]. The genus is from the the Greek words "belly" and "bone". The species epithet is from the Latin words for needle and prickly or sting. The species epithet refers to the spiky dorsal and pelvic fins. Their pelvic fins consist of single spines that are fused to the pelvic girdle. The three dorsal spines and two pelvic fins, when erected, create a challenge for fish predators that they to swallow them. They also have armored plates along their side.
Almost all individuals are anadromous; there are a few populations that are landlocked, same as kokanee, in B.C.. Adults, like this individual, migrate into brackish and freshwater habitats to breed, typically in slow-water habitats. The males weave a nest of algal filaments. A breeding male has a bright green eye and a red belly. He tries to attract a female into his nest. After she lays her eggs, he enters the nest and fertilizes them. Then he drives her off. The male guards and aerates the eggs until they hatch and then he protects the hatchlings for a while. Like steelhead and coastal cutthroat trout, stickleback adults can survive the breeding season (though mortality is high) and head back out to sea to restore their energy reserves. Youngsters migrate back into saltwater and grow there for the next year before migrating back to brackish and freshwater habitats. They feed primarily on planktonic animals, like copepods and various larvae.
Steve
Almost all individuals are anadromous; there are a few populations that are landlocked, same as kokanee, in B.C.. Adults, like this individual, migrate into brackish and freshwater habitats to breed, typically in slow-water habitats. The males weave a nest of algal filaments. A breeding male has a bright green eye and a red belly. He tries to attract a female into his nest. After she lays her eggs, he enters the nest and fertilizes them. Then he drives her off. The male guards and aerates the eggs until they hatch and then he protects the hatchlings for a while. Like steelhead and coastal cutthroat trout, stickleback adults can survive the breeding season (though mortality is high) and head back out to sea to restore their energy reserves. Youngsters migrate back into saltwater and grow there for the next year before migrating back to brackish and freshwater habitats. They feed primarily on planktonic animals, like copepods and various larvae.
Steve
G_Smolt
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The other FishNerds™ beat me to it.
Interesting regional variation - In SE AK, males often have blue eyes. They occasionally commingle with rearing coho in low-gradient and/or off-channel habitat, most often in the upper ITZ meadows of coastal streams.
We nicknamed this one Frank Sinatra
Interesting regional variation - In SE AK, males often have blue eyes. They occasionally commingle with rearing coho in low-gradient and/or off-channel habitat, most often in the upper ITZ meadows of coastal streams.
We nicknamed this one Frank Sinatra
Thank you so much, Steve! I am so appreciative of your expertise and the wealth of knowledge on this forum!
Thank you!
On the Yakima I once found a dead sculpin with a stickleback lodged in its throat. The spines worked I guess. The sculpin wasn’t that much larger than the stickleback, but sculpins have that huge mouth.
I think I once read that sticklebacks, maybe three-spined specifically, are one of the, or the most widely distributed freshwater fish species globally. That reference needs checking, this ain’t Steve posting here.
Sculpins and sticklebacks—by sheer numbers, our “salmon and trout” streams should maybe be called stickleback and sculpin streams.
I think I once read that sticklebacks, maybe three-spined specifically, are one of the, or the most widely distributed freshwater fish species globally. That reference needs checking, this ain’t Steve posting here.
Sculpins and sticklebacks—by sheer numbers, our “salmon and trout” streams should maybe be called stickleback and sculpin streams.
Yes, if there is a river in the Northern Hemisphere that connects to the ocean, it probably has three-spiked sticklebacks. In the U.S., they are absent south of Wilmington, NC through the Gulf of Mexico.
Three-spined sticklebacks were a catalyst in my journey to becoming a biologist. In middle school I read about three-spined sticklebacks from a library book, probably summarizing lab research on their breeding behavior by the ethologist Niko Tinbergen . I also loved to tromp around the salt marsh of the Neponset River near my house (if anything, to escape five younger siblings...). I would use home-made nets to collect organisms like clear marsh grass shrimp and the very common mummichogs (Fundulus heteroclitus) from permanent pools in the marsh. My mom let me have a few small aquaria in my bedroom; I suspect that she liked it better for me to fill the aquaria with fish versus garter snakes that kept "disappearing". One spring, I netted several fish from one deep pool that were different. In a "eureka" moment, I connected these real fish with the book fish. I brought them home and actually had a male build a nest, attract and mate with a female, and produce tiny stickleback young. [I also collected two other stickleback species, fourspine sticklebacks (Apeltes quadricus) and ninespine sticklebacks (Pungitius pungitius) but never breed them.]. So, they have always had a soft spot in my heart...
Steve
Yes, your "hard-drive" has retrieved an accurate fact. Sticklebacks are an intermediary in a complex, three-host tapeworm parasite, Schistocephalus solidus. Larvae from tapeworm eggs are eaten by freshwater copepods. The copepods are eaten by sticklebacks. The infected stickleback are eaten by birds, such as a gull or a loon. The worms finally reproduce sexually within the gut of the bird. The fertilized eggs pass out of the bird's gut and hatch into coracidium larvae. The tapeworms grow massively within the stickleback's gut, up to half the fish's mass. In both copepods (see here) and in sticklebacks (see here and here), infected individuals exhibit riskier behaviors that increase the risk of predation by the next stage in the parasitic chain.
Steve
Steve