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Hearing is an important sensory system for most species of fish. For example, in the family Batrachoididae, males use their swim bladders to make advertisement calls which females use to localize males. Hearing threshold and the ability to localize sound sources are reduced underwater, in which the speed of sound is faster than in air.
The hearing sensitivity of fish is reviewed by Ladich and Fay. [47] The hearing threshold of the soldier fish, is 0.32 mPa (50 dB re 1 μPa) at 1.3 kHz, whereas the lobster has a hearing threshold of 1.3 Pa at 70 Hz (122 dB re 1 μPa). [45] The effects of exposure to underwater noise are reviewed by Popper et al. [48]
The EOD can be species specific and can even sometimes be unique to each individual. [28] Electric fish can also modify the frequency, amount, duration, silent periods, amplitude and chords of their EOD. [28] The natural EOD and the conscious alterations to EOD are all social signals which have been observed to correlate with many social ...
Hearing is an important sensory system for most species of fish. Hearing threshold and the ability to localize sound sources are reduced underwater, in which the speed of sound is faster than in air. Underwater hearing is by bone conduction, and localization of sound appears to depend on differences in amplitude detected by bone conduction. [57]
Biomass estimation is a method of detecting and quantifying fish and other marine organisms using sonar technology. [1] An acoustic transducer emits a brief, focused pulse of sound into the water. If the sound encounters objects that are of different density than the surrounding medium, such as fish, they reflect some sound back toward the source.
Scientists have identified several new marine species in a pristine underwater ecosystem recently discovered in international waters -- and they expect to find more. Modern technology that allows ...
About two percent of fish species can change their sex during their lifetimes. Some tropical fishes like many in the wrasse family (Labridae) actually change sex based on their age and size.
The California Fish and Game Commission unanimously voted to protect western burrowing owls throughout California as a “candidate” species under the California Endangered Species Act.