Cheap aquarium fish - Fish sensitivity
The head Whatever its form - conical, elongated, or stocky - the head houses some important organs: - first of all, there are the eyes, which have no eyelids and are highly mobile. This mobility, coupled with their position on the side of the head, allows a fish to command a broad field of vision - around 270 . In contrast, the clarity of its vision is unexceptional: beyond a certain distance, it distinguishes masses and forms rather than details. Fish are very sensitive to variations in light - detecting low intensities of light, such as that of the moon - and they can recognize colors. - next comes the mouth, with a size and shape related to its feeding habits. Carnivorous fish generally have a large mouth that can open wide and is endowed with an array of pointed teeth, which are sometimes curved towards the back to keep hold of their prey. Omnivorous and herbivorous fish have a smaller mouth, with flat teeth ideally suited to grinding food.The position of the mouth can similarly reveal eating habits: a mouth in the upper position indicates a top-feeder; a mouth in the terminal position is the sign of a fish that hunts underwater; a mouth in the lower position indicates a bottom-feeder.
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