I agree... up to 12 years.
Sound travels sand (with saltwater as pore fluid) a little better than water and much better than air. You can see how good sound travels a medium by looking at its seismic velocity (p-waves).
Pictures of Flatfish or Sole
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Corvus
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Re: Pictures of Flatfish or Sole
Give a man a fish, and he'll eat for a day. Give a fish a man, and he'll eat for weeks.
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RTR
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Re: Pictures of Flatfish or Sole
LOL! Sounds travel better underwater than in air - the density of the medium is a benefit there. Remember that whale songs travel a looong way. But then, thy are very loud and deep sounds, which both help.
Sand is generally considered a dense substrate - it tends to be heavier per uni volume than larger grain sizes. The disadvantage could be that there are fewer and more tortuous water pathways to transmit sound. I don't know how good the grains are at transmission themselves - likely not very good due to signal loss and distortion grain-to-grain. But they really don't bury themselves very deeply. It is just a good dusting, so may not "cost" much.
I've always considered them eye and scent/flavor hunters. Our tanks are so internally noisy from pumps, etc. that hearing cannot be as sensitive as the fish might like, other than at short distances -such as schoolers use for positioning. That is pressure wave more than sound, but it is hard to differentiate between then underwater.
Thanks for the link - I tend to have more confidence in school sites than in the hobby web, as i hope that school folks have learned that they need some sort of published or unpublished data to reference. Plus, that is a realistic lifespan for a smllish fish. Tank or captive lifespan should be toward the higher figure or more if well housed, maintained, and fed of course.
Sand is generally considered a dense substrate - it tends to be heavier per uni volume than larger grain sizes. The disadvantage could be that there are fewer and more tortuous water pathways to transmit sound. I don't know how good the grains are at transmission themselves - likely not very good due to signal loss and distortion grain-to-grain. But they really don't bury themselves very deeply. It is just a good dusting, so may not "cost" much.
I've always considered them eye and scent/flavor hunters. Our tanks are so internally noisy from pumps, etc. that hearing cannot be as sensitive as the fish might like, other than at short distances -such as schoolers use for positioning. That is pressure wave more than sound, but it is hard to differentiate between then underwater.
Thanks for the link - I tend to have more confidence in school sites than in the hobby web, as i hope that school folks have learned that they need some sort of published or unpublished data to reference. Plus, that is a realistic lifespan for a smllish fish. Tank or captive lifespan should be toward the higher figure or more if well housed, maintained, and fed of course.
Where's the fish? - Neptune