The term "fish brainwaves" can be a bit ambiguous because brainwave activity can vary among different species of fish. Additionally, research on fish brainwaves is not as extensive as that on mammals, including humans. However, some studies have investigated brainwave activity in certain fish species.
For example, in a study conducted on goldfish (Carassius auratus), researchers found that their brainwaves had a dominant frequency in the range of 1 to 10 Hz (hertz) during both resting and active states. The corresponding wavelength range would be approximately 30 to 300 meters.
It's important to note that brainwave frequencies and wavelengths can differ based on factors such as fish species, behavior, and the specific brainwave patterns being measured (e.g., delta, theta, alpha, beta waves). Additionally, the brainwave activity of fish may exhibit variations based on their states, such as sleep, wakefulness, or response to stimuli.
Further research and studies are needed to explore and characterize brainwave activity across various fish species more comprehensively.