Rainbow darter (Etheostoma caeruleum) spawning groups and behaviour. (1080p)
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- เผยแพร่เมื่อ 7 ต.ค. 2024
- A procession of fish species use the gravel spawning beds (redds) made by steelhead to host their own spawning activities. Called nest association they take advantage of other species doing the major excavating for them. Black nose dace, cheek chub, common shiner, white sucker and central stoneroller were all spawning at this location on the gravel created from the steelhead spawning earlier in the season. Music by Riot, Vibe music and Chris Zabriskie. Licensed under a creative commons attribution license.
What I find interesting is their ability to stay more or less in one spot in heavy current, a friend mentioned the same thing. I believe the secret is in their body shape. For a darter they are perhaps the most heavy bodied species, the squat but angular body helps give them a low centre of gravity...like a sumo wrestler. This body shape may actually help them adhere or give them a form of suction to the river bottom, especially if some downwards push of current is involved. They are also extremely adept at using rocks and ledges as current brakes. Hidden from predators from above by the mask of heavy current the species was free to evolve some of the brightest colours in the family.
Darters, unlike most other fish do not have air bladders for buoyancy. They're a benthic fish specifically designed to stay on the bottom. This is why in an aquarium they do not stay in the mid or top of the water column. The secret to staying on the bottom in a current is not only their torpedo-like shape, but no swim bladder to make them rise up off the bottom.
Lastly. Darters are the smallest member of the Perch family and are micro-predators. My rainbow darters eat live minnow fry, Mysis shrimp and bloodworms.
So basically they can live in stronger currents in aquarium. Because I read that they dont need not to strong current. 🤔😕🤔😕
Would love to know more. I have the possibility to buy here a couple in the Netherlands. The spectabile. Hope to get some info. Gr from Amsterdam
Cane Corso Molosser I sometimes see them in slower current flows foraging. That said I don't think you could provide them with too much current without blowing your aquarium decor/gravel around. They love groups of large boulder shaped rocks. They are a tough species but MUST be kept cool, under 75 degrees. They are sensitive to low dissolved oxygen and high nitrate and phosphate levels.
@@stevenoakes7991: Well that would not be a problem cold water and I have a big oxidator with 6% peroxide also, next to creating water surface diffusion with filter. In the near future, I will go over to indoor pond and I don't mind not to watch trough glass, I preferr space.
I can get a 1000 liter plastic, round strong pond, here in the Netherlands for 151 eu. Very cheap.
Tnkx for giving some info 😁👍
Cane Corso Molosser No problem. Good luck with them.
Can you imagine when every river and creek was this clear and alive?
A short distance downstream it turns into a concrete storm sewer for awhile, then a somewhat degraded urban stream. In many ways it's still full of life but I often wonder what it was like a couple hundred years ago...or even before that. The change that has happened just in my lifetime is hard to believe.
The easiest way to ID rainbow darters from a distance is from the two bold blotches at the top of the saddle marks on the back, one on each side of the dorsal fin. These marks extend down the sides of the fish and are present on juveniles and females but easier to see on adult males.
Nice work Steve
Thanks Corey, Hope the fish are doing good.
Steve
Due to the extreme current and the difficulty of holding the camera in place...this ones a little bouncy. Its also been slowed down by 50 to 70 percent in an attempt to take some of the dart, out of the darter.